CN113859095A

CN113859095A - Pipe string vehicle and pipe string construction method of oil field well mouth

Info

Publication number: CN113859095A
Application number: CN202111042172.1A
Authority: CN
Inventors: 卿丽纯; 郭方云; 谢术光; 肖久焜; 许乐平
Original assignee: Hunan Shuangda Electromechanical Co ltd
Current assignee: Hunan Shuangda Electromechanical Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2021-12-31

Abstract

The embodiment of the application discloses a pipe string vehicle and a pipe string construction method of an oil field wellhead, which comprises the following steps: a vehicle body; the truss body is rotatably arranged on the vehicle body and used for fixing the pipe string; the guide rail is connected with the truss body; the fixed seat is connected with the guide rail in a sliding manner and is positioned at the rear end of the truss body along the travelling direction; the fixing piece is arranged on the fixing base and is used for being detachably connected with the pipe string to fix the pipe string; the pipe stringing vehicle has a transportation state and an installation state, and the truss body is transversely placed on the vehicle body in the transportation state; in the installation state, the truss body is erected, and when the truss body and the pipe string are released from fixation, the fixing seat can slide up and down along the extending direction of the truss body. The pipe string vehicle and the pipe string construction method of the oil field wellhead can solve the problem of installation of operation tools with different lengths in the installation process.

Description

Pipe string vehicle and pipe string construction method of oil field well mouth

Technical Field

The application relates to the technical field of oil and gas exploitation, in particular to a pipe string vehicle and a pipe string construction method of an oil field wellhead.

Background

The string, otherwise known as a blowout preventer assembly, is typically installed at the oil wellhead, the coiled tubing injector is installed at the top of the blowout preventer assembly, and coiled tubing connected to the coiled tubing injector extends through the string from the oil wellhead into the well.

Corresponding installation is accomplished to rethread handling behind the well head of transporting the tube string components of a whole that can function independently oil field through the transport vechicle usually, because well head place restriction, length differs between each operation subassembly of tube string, occupation space is big, and the instrument is not enough, leads to the tube string to install the difficulty.

Disclosure of Invention

In view of this, the embodiments of the present application are expected to provide a pipe string cart and a pipe string construction method for an oilfield wellhead, which can solve the installation problem of operation tools with different lengths in the installation process.

In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

the first aspect of the embodiment of the application provides a pipe cluster car for transporting and installing pipe clusters, include: a vehicle body; the truss body is rotatably arranged on the vehicle body and used for fixing the pipe string; the guide rail is connected with the truss body; the fixed seat is connected with the guide rail in a sliding mode and is positioned at the rear end of the truss body in the traveling direction; the fixing piece is arranged on the fixing seat and is used for being detachably connected with the pipe string to fix the pipe string; the pipe stringing vehicle has a transportation state and an installation state, and the truss body is transversely placed on the vehicle body in the transportation state; in the installation state, the truss body is erected, and when the truss body and the pipe string are released from fixation, the fixing seat can slide up and down along the extending direction of the truss body.

In one embodiment, the pipe stringing vehicle comprises a height limiting device arranged on the truss body, and the height limiting device can be abutted with the fixed seat to limit the sliding distance of the fixed seat.

In one embodiment, the height limiting device comprises: the spring oil cylinder is arranged on the pull rod; a piston rod of the spring oil cylinder is connected with the pull rod; the rotary seat is hinged with the pull rod, and the rotary seat is rotatably connected with the truss body to form the rotary center; the height limiting device is configured as follows: work as the fixing base is followed the truss body rises, the fixing base promotes the roating seat winds the rotation center is rotatory, the roating seat drives the pull rod downstream, spring cylinder's piston rod is retracted, works as the fixing base is followed the truss body rises to the messenger the fixing base with the primary importance of roating seat separation, spring cylinder's piston rod outwards stretches out and drives under the elastic force effect the pull rod upward movement, the pull rod drives the roating seat resets, so that the roating seat keep can with the spacing state of fixing base butt.

In an embodiment, the height limiting device includes a plurality of the rotating seats, the rotating seats are arranged at intervals along the height direction of the truss body, and each rotating seat is hinged to the pull rod respectively to form the rotating center of each rotating seat.

In one embodiment, when the rotating base is in the limiting state, when the piston rod of the spring oil cylinder retracts under the action of hydraulic oil, the piston rod of the spring oil cylinder drives the pull rod to move downwards, and the pull rod drives the rotating base to rotate, so that the rotating base is switched from the limiting state to an avoiding state for avoiding the fixed base.

In one embodiment, the end part of the pipe string is provided with a union, and the fixing piece is in threaded connection with the union; the mounting is the ring flange, the ring flange includes the disk body and sets up the boss of disk body one side, the pipe cluster is provided with the one end of union is followed one side of fixing base penetrates in the fixing base, the boss is followed the opposite side that the fixing base is relative penetrates in the fixing base with union threaded connection, the disk body is located the outside of fixing base and with fixing base fastening connection.

In one embodiment, the fixing member is a lock pin oil cylinder, the lock pin oil cylinder comprises a lock pin cylinder barrel, a lock pin piston rod arranged in the lock pin cylinder barrel and a lock pin shaft arranged on the lock pin piston rod, an insertion groove is radially arranged on the pipe string, and when the lock pin piston rod axially extends out along the lock pin cylinder barrel, the lock pin shaft is in insertion fit with the insertion groove.

In one embodiment, the pipe string trolley includes a radial limiting component, the radial limiting component includes a first limiting component and a second limiting component, the first limiting component is clamped between the guide rail and the truss body, the second limiting component is disposed on the fixing base and located on one side of the fixing base away from the guide rail, when the truss body is loaded with a pipe string, part of the structure of the pipe string is inserted into the fixing base, and the first limiting component and the second limiting component cooperate to limit the pipe string to move in the radial direction.

In one embodiment, the pipe stringing vehicle comprises a mounting seat, two sets of connecting assemblies and two guide rails; the two guide rails are arranged at intervals along the transverse direction of the truss body; the installation seats are arranged on the truss body, the installation seats are respectively arranged at two opposite ends of each guide rail along the extension direction, the installation seat on at least one guide rail can adjust the transverse position relative to the truss body so as to adjust the transverse distance between the two guide rails, and the installation seat on at least one guide rail can adjust the vertical position relative to the truss body so as to adjust the vertical distance between the two guide rails; the two sets of connecting assemblies are in one-to-one corresponding sliding connection with the two guide rails; the fixing seat is connected with the two sets of connecting components.

In one embodiment, the pipe stringing vehicle comprises a working platform and a hoisting mechanism; the hoisting mechanism comprises a hoisting machine and a steel wire rope wound on the hoisting machine, the hoisting machine is arranged on the fixed seat, the working platform has an accommodating state of being accommodated on the fixed seat and a working state of being suspended below the fixed seat, and the steel wire rope drives the working platform to be switched between the accommodating state and the working state by retracting and releasing; the pipe string car is in under the transportation state, work platform is in the state of accomodating, the pipe string car is in the installation state, work platform is in operating condition.

In one embodiment, the pipe stringing vehicle includes a pipe stringing jaw disposed on the truss body, the pipe stringing jaw including: the device comprises a base, two claw poles and a claw oil cylinder; one end of each claw pole is provided with a first supporting leg and a second supporting leg, and the first supporting leg is hinged to the base at a first hinge point; the two claw poles are oppositely arranged and can be in an open state or a holding state relative to the base; two ends of the claw oil cylinder are respectively hinged with the second support legs of the two claw poles at a second hinge point; the claw oil cylinder can drive the two claw poles to be switched between an opening state and a holding state.

The second aspect of the embodiment of the application provides a pipe string construction method for an oilfield wellhead, which comprises the following steps:

pre-assembling a pipe string; fixing the pipe string on the truss body of the pipe string vehicle; the pipe string trolley is in an installation state, and the truss body is erected so that the pipe string can be erected; installing an injection head at the upper end of the pipe string; hanging the pipe string; loosening the fixing of the truss body and the pipe string, adjusting the height of the pipe string from the ground to form an installation space, and enabling the fixing seat to ascend or descend along the vertical direction along with the pipe string; mounting a work tool to the pipe string within the mounting space; and releasing the fixation of the pipe string and the fixing piece, and transporting the pipe string to a wellhead of the oil field.

The utility model provides a pipe cluster car and oil field well head's pipe cluster construction method is through setting up the automobile body, the truss body, the guide rail, fixing base and mounting, the mounting sets up on the fixing base, be used for being connected with pipe cluster detachably with fixed pipe cluster, the pipe cluster car is under the installation status, the truss body erects on the automobile body, when removing truss body and pipe cluster fixed, the fixing base can slide from top to bottom along the extending direction of truss body, thereby conveniently adjust the lower extreme of pipe cluster to the distance on ground, and then the operation instrument of different length of easy to assemble.

Drawings

FIG. 1 is a schematic structural view of a pipe stringing vehicle according to an embodiment of the present disclosure, wherein the pipe stringing vehicle is in a transport state;

FIG. 2 is a schematic structural diagram of a pipe stringing vehicle according to an embodiment of the present disclosure, wherein the pipe stringing vehicle is in an installed state;

FIG. 3 is a right side view of FIG. 2;

fig. 4 is a schematic structural diagram of a pipe string cart according to an embodiment of the present application, in which the pipe string cart is in a transportation state, and a pipe string is omitted;

FIG. 5 is a schematic view of the working platform of FIG. 4 in a working position with the rails shown in a mated relationship with the truss body;

FIG. 6 is a schematic view of the working platform shown in FIG. 5 in a fitting relationship with a fixing base;

FIG. 7 is a schematic view of the height limiting device shown in FIG. 4;

FIG. 8 is a schematic view of the height limiting device shown in FIG. 4 in a relationship with the fixed base, illustrating the state of the fixed base when the rotating base is pushed to rotate around the rotating center during the ascending process;

FIG. 9 is a schematic view of a second engagement relationship between the height limiting device and the fixed base shown in FIG. 4, wherein the fixed base is in contact with the rotary base;

FIG. 10 is a schematic view of a third mating relationship between the height limiting device and the fixed base shown in FIG. 4, wherein the fixed base is in the second position and the rotating base is in an avoiding state;

FIG. 11 is an enlarged view of a portion of FIG. 1 at A;

FIG. 12 is a schematic view of the engagement of the lock pin cylinder and bushing assembly shown in FIG. 11

FIG. 13 is a front view of the flange;

FIG. 14 is a top view of FIG. 13;

FIG. 15 is a cross-sectional view of FIG. 13;

fig. 16 is a schematic view of the link rod and the fixing base shown in fig. 1, showing a second limiting member;

FIG. 17 is a schematic view of the installation of the guide rail shown in FIG. 1;

FIG. 18 is a top view of FIG. 17, showing only one of the guide rails;

FIG. 19 is an enlarged view of a portion of FIG. 18 at D;

FIG. 20 is an enlarged view of a portion of FIG. 18 at B;

FIG. 21 is a left side cross-sectional view of the structure shown in FIG. 17;

FIG. 22 is an enlarged view of a portion of FIG. 21 at C;

FIG. 23 is a schematic view of a mating relationship between a fixing base and a connecting assembly;

FIG. 24 is a top view of FIG. 8;

FIG. 25 is a front view of a tube string jaw in an embodiment of the present application, wherein the tube string jaw is in an open position;

FIG. 26 is a top view of FIG. 25;

FIG. 27 is a front view of a tube string jaw in accordance with an embodiment of the present application, wherein the tube string jaw is in a hugging configuration;

fig. 28 is a flowchart of a method for string construction at an oilfield wellhead according to an embodiment of the present application.

Detailed Description

It should be noted that, in the case of conflict, the technical features in the examples and examples of the present application may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the present application and should not be construed as an improper limitation of the present application.

In the description of the embodiments of the present application, "upper" and "lower" are based on the orientation or positional relationship shown in fig. 8; "left", "right", "front", "rear" orientation or positional relationship is based on the orientation or positional relationship shown in FIG. 1, it being understood that these orientation terms are merely for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.

A pipe string cart, as shown in fig. 1-28, for transporting a pipe string 900, comprising: the vehicle body 100, the truss body 110, the guide rail 120, the fixing seat 130, and the fixing member 410.

The truss body 110 is rotatably provided on the vehicle body 100 for fixing and carrying the pipe string 900; the guide rail 120 is connected to the truss body 110; the fixing seat 130 is slidably connected to the guide rail 120, so that the fixing seat 130 can slide relative to the truss body 110, and the fixing member 410 is disposed on the fixing seat 130 and detachably connected to the pipe string 900 to fix the pipe string 900, so that the fixing seat 130 and the pipe string 900 can be fixed relative to each other.

The pipe string cart has a transportation state and an installation state, in the transportation state, the truss body 110 is transversely placed on the cart body 100, the truss body 110 is fixed with the pipe string 900, and the truss body 110 bears the whole weight of the pipe string 900; in an installation state, the truss body 110 is erected on the vehicle body 100, the truss body 110 and the pipe string 900 are released from being fixed, and the fixing seat 130 can slide up and down along the extending direction of the truss body 110, so that the distance from the lower end of the pipe string 900 to the ground can be conveniently adjusted, and different operation tools can be conveniently installed.

Specifically, referring to fig. 1 to 4 and 11 to 15, the vehicle body 100 bears the load of all other components and has a corresponding power mechanism to transport the components and the pipe string 900 for transfer. The guardrails and the mudguards are arranged on two sides of the vehicle body 100, and can ensure that personnel are isolated from the truss body 110, the guide rail 120, the fixed seat 130 and the fixing piece 410, so as to ensure the safety of the personnel during the operation of the components; the fender prevents soil from splashing during travel.

The truss body 110 is rotatably provided on the vehicle body 100 for fixing and carrying the pipe string 900. The string 900 is a tubular assembly having an axial length that has been pre-installed with the corresponding components, e.g., lubricator 920, dynamic seal blowout preventer cartridge 930, and static seal blowout preventer 940, etc., prior to shipment. The truss body 110 is a structural body having a certain axial length. The guide rail 120 is connected to the truss body 110; the fixing seat 130 is slidably disposed on the guide rail 120, and the fixing member 410 is disposed on the fixing seat 130 and is used for detachably connecting with the pipe string 900 to fix the pipe string 900, that is, the fixing seat 130 can axially ascend or descend along the guide rail 120 relative to the truss body 110; part of the structure of the tube string 900, for example, the lower end of the tube string 900, is inserted and fixed in the fixing seat 130; the pipe string 900 is detachably connected to the fixing member 410, so that the pipe string 900 is fixed to the fixing seat 130, and the fixing seat 130 ascends or descends on the guide rail 120 along the extending direction (i.e., axial direction) of the truss body 110, thereby driving the pipe string 900 fixed to the fixing seat 130 to ascend or descend axially relative to the truss body 110, so that a worker can install working tools of different lengths on the pipe string 900 in a suitable installation space, for example, in a coiled tubing extending from the pipe string 900.

In the process that the pipe string vehicle bears the pipe string 900 to be transported to a destination, the pipe string vehicle is in a transportation state of transporting the pipe string 900, the truss body 110 is transversely placed, the truss body 110 leans against the vehicle body 100 in a nearly horizontal direction, the truss body 110 and the pipe string 900 are kept fixed, and the truss body 110 bears the whole weight of the pipe string 900; the rear end of the tube string 900 is detachably fixed to the fixing member 410 as an axial stopper, so that the tube string 900 is fixed to the fixing base 130. Specifically, the pipe string 900 is fixed to the truss body 110 in an almost parallel manner, the truss body 110 is fixed to the pipe string 900, the weight of the pipe string 900 is carried by the truss body 110, and the truss body 110 may be provided with a pipe string jaw 700 (mentioned below) to fix the radial direction of the pipe string 900, that is, the pipe string 900 is also maintained in a nearly horizontal posture, and the weight is transmitted downward to the vehicle body 100 through the truss body 110. The fixing seat 130 is located at the rear end of the truss body 110 in the traveling direction, the fixing part 410 fixes the rear end part of the pipe string 900, the pipe string 900 is bound with the fixing seat 130 through the fixing part 410, and further the bottom end of the pipe string 900 can be fixed with the fixing seat 130, the fixing seat 130 is fixed relative to the guide rail 120, therefore, the pipe string 900 can be prevented from moving in the extending direction of the guide rail 120, when the pipe string vehicle encounters emergency braking, downhill traveling or bend steering in the transportation process, because the fixing part 410 serving as an axial limiting device exerts an axial limiting effect on the pipe string 900, the pipe string 900 cannot move forwards due to the action of inertia, and the traveling safety of the pipe string vehicle is improved.

It should be understood that, in the various embodiments of the present application, the extending direction along the truss body 110 is an axial direction, the end of the vehicle body 100 forward along the driving direction is a front end, the end of the vehicle body 100 rearward away from the driving direction is a rear end, and the fixing seat 130 is located at the rear end of the truss body 110 along the driving direction.

Referring to fig. 2, when the pipe string cart transports the pipe string 900 to a destination, which is usually a wellhead of an oil field, the pipe string cart is in an installation state, the truss body 110 rotates around the cart body 100 to a vertical state, so that the pipe string 900 rotates to the vertical state, the injection head is lifted and installed at the upper end of the pipe string 900 by an external crane, and then the pipe string 900 is lifted by the crane, at this time, the weight of the pipe string 900 is mainly borne by the crane, the truss body 110 is released from being fixed to the pipe string 900, for example, a pipe string claw 700 for fixing the pipe string 900 on the truss body 110 is released, at this time, the truss body 110 is no longer fixed to the pipe string 900, so that the pipe string 900 is released from being fixed to the truss body 110, but the fixing piece 410 is still fixed to the bottom end of the pipe string 900, and the fixing base 130 can slide up and down along the guide rail 120 (i.e., the extending direction of the truss body 110). The upper end of the pipe string 900 is hung and connected with the crane through a rope, the lower end of the pipe string is connected with the fixed seat 130 through the fixed part 410, and the two ends are positioned to ensure that the pipe string 900 cannot swing; then, according to the difference of the lengths of the operation tools to be installed at the lower end of the pipe string 900, the pipe string 900 is vertically hoisted to a certain height from the ground through a crane, an installation space M is formed between the bottom end of the pipe string 900 and the ground, the installation space M can be completely placed in the operation tools and cannot be too long or too short, and therefore installation operation of operators is effectively facilitated; in the process of operating the crane to enable the pipe string 900 to ascend or descend, the lower end of the pipe string 900 drives the fixing member 410 fixed thereto to ascend or descend, so that the fixing seat 130 is erected on the guide rail 120 to slide up and down along the extending direction (i.e. the vertical direction) of the truss body 110, and the lower end of the pipe string 900 is effectively prevented from swinging left and right to affect the installation process of the operation tool. After the operation tool is installed, the fixing member 410 may be released, so that the pipe string 900 is completely separated from the fixing seat 130, and the pipe string 900 may be hoisted to the wellhead of the oil field by the crane.

In addition, in the installation process, under the unexpected condition that the crane fails, the fixing member 410 is arranged on the fixing base 130 and can also be used as a bottom support for fixing the pipe string 900 at different heights, and the height limiting device (mentioned below) is matched to prevent the pipe string 900 from being pressed to the operator who carries out the installation operation below, so that the safety is ensured.

In some embodiments, the pipe string cart may be provided with a work platform 140 (mentioned below), the work platform 140 may be suspended below the mounting base 130, and an operator may work on the work platform 140 to facilitate mounting work tools to the bottom end of the pipe string 900.

In some non-limiting embodiments, the tandem pipe vehicle may include a subframe 150 and a luffing cylinder 160, both subframe 150 and luffing cylinder 160 being mounted to the vehicle body 100, subframe 150 being generally disposed at a rear end of the vehicle body 100, i.e., an end away from the vehicle head; the truss body 110 is connected to the sub-frame 150 and the luffing cylinder 160 through the luffing cylinder 160 in the form of a triple hinge point, respectively, thereby achieving a function of rotating the truss body 110 with respect to the vehicle body 100. In addition, a first leg 170 capable of swinging in both sides is provided on the subframe 150, and a second leg 180 capable of swinging in both sides is provided on one end of the vehicle body 100 away from the subframe 150; the pipe string vehicle is in a transportation state of transporting the pipe string 900, and the first support leg 170 and the second support leg 180 are folded and cling to two sides of the vehicle body 100, so that driving and transportation are prevented from being influenced; the pipe stringing vehicle is in an installation state, and the first support leg 170 and the second support leg 180 extend towards two sides and are supported on the ground, so that the stability is increased, and the safety is ensured.

When the pipe string vehicle is in an installation state to install the pipe string 900, the first support leg 170 and the second support leg 180 are unfolded, the vehicle body 100 is supported to the ground of a tire, then the truss body 110 is changed in amplitude to be vertical to the ground, the working platform 140 is put down, the injection head is installed at the upper end of the pipe string 900 by the crane, the crane lifts the pipe string 900, the pipe string clamping jaws 700 are loosened, the height of the pipe string 900 is adjusted, a wellhead operation tool is installed in the blowout prevention pipe 920 of the pipe string 900 from the working platform 140, the pipe string 900 with the injection head installed and the fixing seat 130 are lowered to the lowest position by the crane, the limitation on the fixing seat 130 is released, and the pipe string 900 with the injection head installed is lifted to the wellhead by the crane to complete corresponding installation.

In some non-limiting embodiments, a hydraulic system that can power the various hydraulic actuators described above, and a control system for coordinating the control operations of the electrical, hydraulic, etc. components of the pipe string, are integrated into the body 100.

In the related art, the pipe stringing vehicle is provided with a truss body and a fixed seat arranged on the truss body in a lifting manner. When transporting the pipe string, the truss body leans on the automobile body of pipe string car to one side, the pipe string is fixed on the truss body and is connected with fixing base detachably, when delivering the operation instrument in well site to coiled tubing, the truss body switches to upright state, the hoist hangs the coiled tubing injector to the top and the pipe string of pipe string earlier is connected, then upwards hangs the pipe string, because the fixing base links together with the pipe string, therefore, in the in-process of lifting by crane, the fixing base can upwards slide along the truss body, and drive work platform and rise together, after the pipe string hangs to suitable height, the operating personnel on the work platform just can send the operation instrument into in the coiled tubing who stretches out from the pipe string bottom. However, when the coiled tubing injector, the tubing string, the fixing seat and the working platform are lifted to a certain height from the ground by the crane, the whole components are unstable and fall off due to the failure of the crane, so that the safety of operators who install and replace working tools on the working platform is threatened.

In this application embodiment, the pipe cluster car is spacing to pipe cluster 900 through setting up full limit structure, and full limit structure includes high stop device 300, fixing piece 410 and the radial spacing subassembly 500 as axial stop device.

When the pipe string vehicle is in a transportation state, the fixing piece 410 and the radial limiting assembly 500 which are used as axial limiting devices respectively limit the pipe string 900 in the axial direction and in the radial direction, and the fixing piece 410 which is used as the axial limiting device exerts the limiting effect along the axial direction on the pipe string 900 when the pipe string vehicle is subjected to emergency braking, downhill driving or bend steering in the transportation process, the pipe string 900 cannot move forwards due to the inertia effect, and therefore the driving safety of the pipe string vehicle is improved; when the pipe string vehicle vibrates up and down due to uneven road surface, the pipe string 900 can be prevented from moving along the radial direction in the transportation process, so that damage to each structure of the pipe string vehicle is avoided, and the running safety of the pipe string vehicle is improved.

The pipe stringing vehicle is in an installation state, and when the crane fails and the components are integrally unstable and fall out of order, the height limiting device 300 can abut against the fixed seat 130 to limit the sliding distance of the components when the crane fails by arranging the height limiting device 300 on the truss body 110, so that the safety is ensured to the maximum extent.

In a specific embodiment, as shown in fig. 1 to 4, and fig. 7 to 10, the height limiting device 300 includes: a pull rod 3132, a spring cylinder 3133, and a rotary base 3131 having a rotation center 3131 a. The rotation center 3131a of the rotation base 3131 is a rotation point about which the rotation base 3131 can rotate, and may be a center of gravity of the rotation base 3131, and the rotation center 3131a of the symmetric rotation base 3131 may be a geometric center.

A piston rod 3135 of the spring oil cylinder 3133 is connected with a pull rod 3132, a rotary seat 3131 is hinged with the pull rod 3132, and the rotary seat 3131 is rotatably connected with the truss body 110 to form a rotary center 3131 a; the hinge point of the rotation seat 3131 and the pull rod 3132 is not at the same point as the rotation center 3131 a. Thus, the spring cylinder 3133, the pull rod 3132, and the rotary base 3131 of the height limiting device 300 may be integrally connected.

The height limiting device 300 is configured to: when the fixed base 130 rises along the truss body 110, the fixed base 130 pushes the rotation base 3131 to rotate around the rotation center 3131a, the rotation base 3131 drives the pull rod 3132 to move downward, the piston rod 3135 of the spring cylinder 3133 retracts, that is, the rotation base 3131 can be pushed by the fixed base 130 to rotate, and the piston rod 3135 of the spring cylinder 3133 retracts by driving the pull rod 3132 to avoid the rising of the fixed base 130. It should be noted that, in the spring cylinder 3133 of the embodiment of the present invention, in the initial state, a portion of the piston rod 3135 of the spring cylinder 3133 extends out of the cylinder barrel, that is, in the initial state, the elastic member in the spring cylinder 3133 is in a natural state, and when an external force axially compresses the spring cylinder 3133, the elastic member is compressed, and the piston rod 3135 retracts into the spring cylinder 3133. When the fixing base 130 rises along the truss body 110 to a first position where the fixing base 130 is separated from the rotating base 3131, the piston rod 3135 of the spring cylinder 3133 extends outward under the action of elastic force and drives the pull rod 3132 to move upward, and the pull rod 3132 drives the rotating base 3131 to return, so that the rotating base 3131 is kept in a limit state capable of abutting against the fixing base 130. That is, the piston rod 3135 of the spring cylinder 3133 may drive the pull rod 3132 to move upward through rebounding, so that the fixing seat 130 abuts against the reset rotary seat 3131, and the downward movement of the fixing seat 130 may be limited, so as to limit the downward movement of the components such as the coiled tubing injector, the tubing string, the working platform, and the like, thereby solving the risk of the overall unstable falling of each component due to the failure of the crane, and improving the operation safety.

The limit state of the rotary base 3131 is a state in which the rotary base 3131 is in a return state due to an upward movement of the pull rod 3132 by the spring cylinder 3133, but the abutment of the fixed base 130 with the rotary base 3131 is not a requirement that the rotary base 3131 be in the limit state.

In an embodiment, referring to fig. 9, the fixing base 130 includes a hook portion 131 and a fixing base body 132, the hook portion 131 is fixedly connected to the fixing base body 132, and when the rotating base 3131 is in a limiting state, the fixing base 130 abuts against the rotating base 3131 by the hook portion 131.

It is understood that the hook 131 refers to a hook-shaped structure that can abut against the rotary seat 3131, and may be an L-shaped hook.

In one embodiment, referring to fig. 8 to 10, the height limiting device 300 includes a plurality of rotating seats 3131, the plurality of rotating seats 3131 are spaced apart from each other along the height direction of the truss body 110, and each rotating seat 3131 is hinged to a pull rod 3132 to form a rotating center 3131a of each rotating seat 3131. The hinged point of each rotary seat 3131 and the pull rod 3132 may be the same, the position of the rotation center 3131a of each rotary seat 3131 on each rotary seat 3131 may be the same, and the fixed seat 130 may be abutted to different rotary seats 3131, so as to adjust the position of the fixed seat 130, thereby facilitating the operator to send the working tools with different lengths into the continuous oil pipe extending from the bottom of the pipe string at different heights.

In an embodiment, referring to fig. 8 to 10, the height limiting device 300 further includes a plurality of rotating seat limiting plates 3134, the rotating seat limiting plates 3134 are disposed on the truss body 110, the rotating seat limiting plates 3134 can be fixedly connected to the truss body 110, and when the rotating seat is in a limiting state, each rotating seat limiting plate 3134 is in one-to-one abutting contact with the rotating seat 3131, so as to improve the safety when the fixing seat 130 abuts against the rotating seat 3131.

It should be noted that, when the rotary seat 3131 is in the limit state, the fixing seat 130 may abut against one end of the rotary seat 3131, and each rotary seat limit plate 3134 abuts against the other end of the rotary seat 3131 opposite to the fixing seat 130, so that the bending moment applied to the rotary seat 3131 by the fixing seat 130 may be offset by the bending moment applied to the rotary seat 3131 by the rotary seat limit plate 3134, thereby stabilizing the rotary seat 3131 and greatly improving the stability of the fixing seat 130.

It should be noted that, since the spring cylinder 3133 and the pull rod 3132 of the height limiting device 300 are integrally connected to each of the rotary seats 3131, the number of the respective rotary seat limiting plates 3134 may be the same as that of the rotary seat 3131, or may be smaller than that of the rotary seat 3131, that is, each of the rotary seat limiting plates 3134 stabilizes the rotary seat 3131 in contact therewith, and at the same time, stabilizes the rotary seat 3131 not in contact with the rotary seat limiting plate 3134 due to the action of the pull rod 3132, so that the number and position of the plurality of rotary seat limiting plates 3134 may be set as necessary.

In an embodiment, referring to fig. 10, when the rotating base 3131 is in a limiting state, when the piston rod 3135 of the spring cylinder 3133 retracts under the action of hydraulic oil, the fixing base 130 is in a position not interfering with the rotation of the rotating base 3131, i.e., not abutting against the rotating base 3131. The piston rod 3135 of the spring cylinder 3133 drives the pull rod 3132 to move downward, and the pull rod 3132 drives the rotation seat 3131 to rotate, so that the rotation seat 3131 is switched from a limit state to an avoiding state of the avoiding fixing seat 130, which can facilitate the fixing seat 130 to ascend or descend along the truss body 110 to adjust the position, thereby facilitating the installation operation of the operator.

Specifically, when the fixed seat 130 descends from above the rotating seat 3131 to below the rotating seat 3131 along the truss body 110, the rotating seat 3131 rotates by the hydraulic oil of the spring oil cylinder 3133, so as to switch from the limit state to the avoidance state. When the fixing base 130 is lifted from below the rotating base 3131 along the truss body 110 to above the rotating base 3131, the rotating base 3131 is rotated by the pushing force of the fixing base 130.

In an embodiment, referring to fig. 10, when the fixing base 130 is in a state of abutting against the rotating base 3131, when the fixing base 130 is lifted along the truss body 110 to a second position of avoiding the rotating base 3131, the piston rod 3135 of the spring cylinder 3133 is retracted under the action of hydraulic oil, and it should be noted that the second position may be the same as or different from a first position where the fixing base 3131 is lifted after being pushed to rotate and separated from the rotating base 3131.

A piston rod 3135 of the spring cylinder 3133 drives the pull rod 3132 to move downward, the pull rod 3132 drives the rotation seat 3131 to rotate, and the rotation seat 3131 is switched from a limit state to an avoiding state of the avoiding fixing seat 130, so that the fixing seat 130 can freely descend along the truss body 110. The position of the fixing base 130 can be adjusted by conveniently ascending or descending along the truss body 110, so that the installation work of an operator can be facilitated.

The free lowering means that when the rotary seat 3131 is in the avoiding state, the fixed seat 130 can freely descend along the truss body 110 without being constrained by any one of the rotary seats 3131, that is, the fixed seat 130 can freely descend from the truss body 110 above the rotary seat 3131 at the top to the truss body 110 below the rotary seat 3131 at the bottom.

In an embodiment, in order to make the fixing seat 130 more stable and safe, two sets of height-limiting devices 300 may be disposed at intervals along the transverse direction of the tube stringing vehicle, the rotating seat 3131 is in a limiting state, the fixing seat 130 abuts against the rotating seats 3131 of the two sets of height-limiting devices 300, and multi-point limiting enables the dropped tube stringing 900, the fixing seat 130 and the working platform 140 to be more stable and not to tip over, and at the same time, the bearing pressure of each set of height-limiting devices 300 may be reduced, and the safety performance of the device may be improved.

In an embodiment, referring to fig. 1 to 4 and fig. 11 to 15, when the truss body 110 is loaded with the tube string 900, a part of the tube string 900 is inserted into the fixing seat 130.

Specifically, a part of the structure of the pipe string 900 penetrates into the fixing seat 130 and is bound with the fixing seat 130 through the fixing member 410, so that the pipe string 900 is fixed, the pipe string 900 can be prevented from moving forwards under the action of inertia, and the driving safety is improved. When the pipe string vehicle is in a transportation state for transporting the pipe string 900, the truss body 110 leans against the vehicle body 100 in a direction close to the horizontal direction, and when the pipe string vehicle encounters emergency braking, downhill driving or curve steering in the transportation process, because the fixing piece 410 serving as an axial limiting device exerts a limiting effect on the pipe string 900 along the axial direction, the pipe string 900 does not move forward due to the inertia effect, and thus the driving safety of the pipe string vehicle is improved.

In an embodiment, referring to fig. 11 to 15, the fixing element 410 is fixedly connected to the fixing base 130, one end of the tube string 900 is provided with a union 910, and the fixing element 410 is in threaded connection with the union 910, so that the fixing element 410 and the tube string 900 can be detachably connected.

Specifically, the pipe string 900 may be provided with the union 910, and the threaded joint of the union 910 is in threaded connection with the fixing member 410, so that the pipe string 900 is bound with the fixing seat 130, and therefore, the purpose of fixing the pipe string 900 is achieved, when the pipe string vehicle encounters emergency braking, downhill driving or curve steering in the transportation process, because the fixing member 410 serving as an axial limiting device exerts an axial limiting effect on the pipe string 900, the pipe string 900 does not move forward due to the action of inertia, and the driving safety of the pipe string vehicle is improved.

In an embodiment, referring to fig. 11 and 13 to 15, the fixing member 410 is a flange 420, the flange 420 includes a plate 421 and a boss 422 disposed on one side of the plate 421, one end of the union 910 penetrates into the fixing base 130 from one side of the fixing base 130, the boss 422 penetrates into the fixing base 130 from the other side opposite to the fixing base 130 to be in threaded connection with the union 910, and the plate 421 is located outside the fixing base 130 and is fastened to the fixing base 130.

Specifically, the union 910 may be connected to the flange 420, so as to fix the fixing member 410 serving as an axial limiting device to the pipe string 900. The flange plate 420 comprises a plate body 421 and a boss 422, wherein the boss 422 can be a hollow cylinder with pipe threads arranged on the outer surface, the boss 422 is in threaded connection with one end of the union 910, the pipe string 900 is connected with the other end of the union 910, and part of the structure at the end part of the pipe string 900 can be embedded into the boss 422. In addition, the boss 422, the union 910 and the pipe string 900 all penetrate into the fixing base 130, and the plate 421 is located outside the fixing base 130 and is fastened to the fixing base 130. Therefore, the pipe string 900 and the axial limiting device can be more stable.

In an embodiment, the plate 421 is located behind the fixing base 130 along the traveling direction of the pipe tandem, and is fastened to the fixing base 130, wherein the fastening may be through bolts, screws, or other fastening members. In addition, in the transportation process of the pipe string vehicle, under the conditions of emergency braking, downhill driving or bend steering, the pipe string 900 moves forwards in the driving direction due to inertia, so the disc body 421 can be directly abutted with the fixing seat 130, the acting force between the disc body and the fixing seat cannot be transmitted to the fastening piece, the fastening piece can be prevented from being damaged, and the driving safety of the pipe string vehicle is improved.

In an embodiment, referring to fig. 11, the fixing member 410 may be a lock pin cylinder 430, the lock pin cylinder 430 includes a lock pin cylinder 431, a lock pin piston rod 432 disposed in the lock pin cylinder 431, and a lock pin shaft 433 disposed on the lock pin piston rod 432, the tube string 900 is radially provided with an insertion groove, and when the lock pin piston rod 432 axially extends along the lock pin cylinder 431, the lock pin shaft 433 is inserted and matched with the insertion groove.

Specifically, the locking pin cylinder 430 and the tube string 900 are in a plugging fit to bind the tube string 900 and the fixing seat 130, so as to enrich the type of the fixing part serving as the axial limiting device. The lock pin cylinder 430 and the fixing base 130 may be detachably connected or fixedly connected according to actual requirements. Thus, the locking pin shaft 433 is inserted into the insertion groove under the action of the piston to prevent the pipe string 900 from moving axially.

It should be noted that when the fixing member 410 is the lock pin cylinder 430, the pipe string 900 may not include the union 910.

In an embodiment, referring to fig. 11, according to practical situations, the lock pin cylinder 430 and the flange plate 420 may be disposed at the same time to be used as the fixing member 410, so as to ensure that the pipe string 900 does not move, and improve the driving safety.

In an embodiment, referring to fig. 11, the insertion groove may be located at the journal of the pipe string 900, that is, the lock pin cylinder 430 may be inserted at the journal of the pipe string 900 for limiting.

In one embodiment, referring to fig. 12, the locking pin cylinder 430 further includes a ball head lever 434 and a connecting seat 437, the ball head lever 434 includes a connecting rod 435 and a ball head 436 disposed at one end of the connecting rod 435, the connecting seat 437 has a ball groove, the ball head 436 is rotatably disposed in the ball groove, one of the connecting rod 435 and the connecting seat 437 is connected to the locking pin piston rod 432, the other is connected to the locking pin shaft 433, and an axis of the ball head lever 434 extends along a telescopic direction of the locking pin piston rod 432.

Specifically, the ball head 436 is rotatably disposed in the ball groove, so that the lock pin shaft 433 and the lock pin piston rod 432 connected to the ball head shaft 434 and the ball groove can rotate relatively to each other by a certain angle, and the lock pin cylinder 430 is disposed on the fixing base 130. Therefore, when the pipe string vehicle is braked emergently, runs on a downhill or turns around a curve, the pipe string 900 tends to axially move under the action of inertia, the pipe string 900 exerts an acting force on the lock pin shaft 433 along the radial direction of the lock pin shaft 433, the lock pin shaft 433 can transmit the acting force to the fixed seat 130 by rotating relative to the lock pin piston rod 432, the stress at the lock pin piston rod 432 of the lock pin oil cylinder 430 is greatly reduced, the safety performance of the lock pin oil cylinder 430 is improved, force transmission is smoother, and the limiting effect on the pipe string 900 is improved.

In addition, one of connecting rod 435 and connecting seat 437 is connected with lock pin piston rod 432, and the other is connected with lock pin shaft 433, which means that lock pin piston rod 432 is connected with connecting rod 435, lock pin shaft 433 is connected with connecting seat 437, or lock pin piston rod 432 is connected with connecting seat 437, and lock pin shaft 433 is connected with connecting rod 435.

It should be noted that the axis of the ball head shaft 434 extends in the telescopic direction of the locking pin piston rod 432 means that the axis of the ball head shaft 434 and the axis of the locking pin piston rod 432 may be parallel or have a certain small angle, but the directions of the two are the same.

In one embodiment, referring to fig. 12, the axis of the locking pin shaft 433 extends along the extension and retraction direction of the locking pin piston rod 432.

It should be noted that, that is to say, the axial lines of the lock pin shaft 433 and the ball head rod 434 are both along the telescopic direction of the lock pin piston rod 432, and the axial lines of the lock pin shaft 433 and the lock pin piston rod 432 may be arranged in parallel or not, and herein, the extending directions are the same, so that force transmission is smoother.

In an embodiment, referring to fig. 12, the axial limiting device further includes a shaft sleeve assembly 440 having an installation channel 441, the shaft sleeve assembly 440 is disposed on the fixing base 130, one end of the lock pin cylinder 431 near the lock pin shaft 433 is connected to the shaft sleeve assembly 440, and a part of the structure of the lock pin shaft 433 is inserted into the installation channel 441.

Specifically, when the lock pin shaft 433 deflects under the action of the tube string 900, the force can be transmitted to the boss assembly 440 and thus to the fixing base 130, thereby protecting the lock pin cylinder 430 and the fixing base 130.

In one embodiment, referring to fig. 1-4, 11, 12, and 16, the pipe tandem includes a radial stop assembly 500; the radial limiting assembly 500 includes a first limiting member 510 and a second limiting member 520, the guide rail 120 is connected to the truss body 110, the fixing base 130 is slidably connected to the guide rail 120, the first limiting member 510 is clamped between the guide rail 120 and the truss body 110, the second limiting member 520 is disposed on the fixing base 130 and located on a side of the fixing base 130 away from the guide rail 120, when the truss body 110 is loaded with the pipe string 900, a part of the pipe string 900 is inserted into the fixing base 130, and the first limiting member 510 and the second limiting member 520 are matched to limit the pipe string 900 to move in a radial direction.

Specifically, the first limiting member 510 is clamped between the guide rail 120 and the truss body 110, the fixing base 130 is slidably connected to the guide rail 120, and the second limiting member 520 is disposed on the fixing base 130 and located on a side of the fixing base 130 away from the guide rail 120. That is, the first limiting member 510 is disposed on a side of the fixing base 130 close to the rail 120, and the second limiting member 520 is disposed on a side of the fixing base 130 far from the rail 120. Part of the tube string 900 is inserted into the fixing base 130, and the first limiting member 510 and the second limiting member 520 cooperate to limit the tube string 900 from moving in the radial direction. That is, the second limiting member 520 disposed at one side of the fixing base 130 limits the upward movement of the tube string 900, and the second limiting member 520 disposed at the other side of the fixing base 130 limits the downward movement of the fixing base 130 and the tube string 900 by limiting the downward movement of the guide rail 120. Therefore, when the pipe string vehicle vibrates up and down due to uneven road surface, the pipe string 900 can be prevented from moving along the radial direction in the transportation process, damage to each structure of the pipe string vehicle is avoided, and the running safety of the pipe string vehicle is improved.

In an embodiment, referring to fig. 16, the pipe stringing vehicle further includes a stop rod 530 detachably disposed on the fixing base 130, and the second limiting member 520 is connected to the stop rod 530.

Specifically, the second limiting element 520 may be connected to the stop rod 530, and detachably disposed on the fixing base 130 through the stop rod 530, so that the second limiting element 520 is detachably disposed on the fixing base 130. That is, when the tube string 900 is inserted into the fixing base 130, the stop lever 530 connected to the second limiting member 520 and the fixing base 130 may be removed, and after the tube string 900 and the fixing base 130 are assembled, the second limiting member 520 and the stop lever 530 are installed on the fixing base 130. Therefore, when the pipe string 900 is assembled with the fixing seat 130, the pipe string 900 is heavy and can directly impact the second limiting part 520 arranged on the fixing seat 130 under the action of inertia, so that damage to each component is caused, installation is safer and more convenient, and installation difficulty is reduced.

In addition, the detachable manner can be a screw connection, a snap connection, a fastening connection, a hinge connection, or other manners that can enable the blocking rod 530 to be detachably disposed on the fixing base 130.

In one embodiment, referring to fig. 16, the fixing base 130 is fastened to the stop bar 530. Specifically, the fastening connection refers to fastening the fixing base 130 and the stop lever 530 by bolts, screws, or other fastening members, so that the fixing base is stable and the installation thereof is more convenient.

In an embodiment, referring to fig. 16, the fixing base 130 has two first inserting-connecting grooves 130a arranged at intervals along the transverse direction, the stopping rod 530 is an elbow 540, for example, a U-shaped elbow, and the extending opposite ends of the elbow 540 are respectively inserted into the corresponding first inserting-connecting grooves 130a and are fastened to the sidewalls of the first inserting-connecting grooves 130 a.

Specifically, the two ends of the bent tube 540 are in one-to-one corresponding insertion fit with the two insertion grooves, and then are fastened and connected by fastening members. Therefore, the position of the second stopper 520 provided on the bent pipe 540 in the axial direction of the pipe string 900 can be adjusted by fastening the bent pipe 540 to different positions of the insertion groove according to actual needs. In addition, the sidewalls of the first socket 130a refer to respective wall surfaces forming the first socket 130 a.

In an embodiment, the number of the first inserting grooves 130a may be one or more according to the actual requirement.

In an embodiment, the extending direction of the first inserting groove 130a may also be parallel to the radial direction of the tube string 900, and the radial relative position between the second position-limiting member 520 and the tube string 900 may be adjusted.

In an embodiment, referring to fig. 11, the radial limiting component 500 includes a plurality of first limiting members 510, and the plurality of first limiting members 510 are disposed at intervals along the axial direction of the guide rail 120, so as to better stabilize the guide rail 120.

In one embodiment, referring to fig. 1 to 4, 17 and 18, the pipe tandem includes a mounting base 610, two sets of connecting assemblies 620 and two guide rails 120. The two guide rails 120 are spaced apart in the lateral direction of the truss body 110 and extend in the longitudinal direction of the truss body 110. The mounting seats 610 are disposed on the truss body 110, and the mounting seats 610 are respectively disposed at opposite ends of each guide rail 120 in the extending direction. That is, each rail 120 is provided at least at both ends thereof with one mounting seat 610, respectively, so as to stabilize the rail 120. In addition, the mounting seat 610 may be additionally provided at other positions of each guide rail 120 to improve the stability of the guide rail 120. The mounting seat 610 of the at least one rail 120 can be adjusted in a lateral position relative to the truss body 110 to adjust a lateral distance between the two rails 120, and the mounting seat 610 of the at least one rail 120 can be adjusted in a vertical position relative to the truss body 110 to adjust a vertical distance between the two rails 120. That is, the horizontal and vertical distances between two guide rails 120 may be adjusted by adjusting the horizontal and vertical positions of the mounting seat 610 relative to the truss body 110, and may be achieved by adjusting the horizontal and vertical positions of the mounting seat 610 on one guide rail 120, or by adjusting the horizontal and vertical positions of the mounting seats 610 on two guide rails 120 at the same time, or by adjusting the horizontal position of the mounting seat 610 on one guide rail 120 and the vertical position of the mounting seat 610 on the other guide rail 120. The two sets of connecting assemblies 620 are in one-to-one corresponding sliding connection with the two guide rails 120, and the fixing seat 130 is connected with the two sets of connecting assemblies 620. So set up, can be through horizontal and vertical interval between adjusting two guide rails, make the position size between two guide rails 120 satisfy the installation requirement, from this, can reduce the installation degree of difficulty of guide rail 120, it is more convenient to make the installation.

It should be noted that, the horizontal position and the vertical position of the installation base 610 along the truss body 110 are adjustable before and during installation, and the relative position between the two guide rails 120 can be adjusted by adjusting the setting position of the installation base 610, so as to meet the requirement of installation accuracy and improve the installation convenience. After installation is complete, the position of mount 610 cannot be moved to facilitate securing rail 120.

In an embodiment, referring to fig. 21 and 22, the connecting assembly 620 includes a claw seat 621 and a sliding block 622 connected to the claw seat 621, the sliding block 622 is slidably connected to the guide rail 120, and the claw seat 621 is connected to the fixing seat 130. That is, the claw seat 621 is connected to the fixing seat 130, and the slider 622 connected to the claw seat 621 is slidably connected to the guide rail 120, so that the fixing seat 130 can slide up and down along the guide rail 120. In an embodiment, referring to fig. 21 to 23, the sliding block 622 is an annular structure having an opening with an angle smaller than 180 degrees, and the sliding block 622 is sleeved on the guide rail 120.

It should be noted that, when the truss body 110 is in the vertical state, since the sliding block 622 is sleeved on the guide rail 120, the sliding block 622 can still slide up and down along the guide rail 120, and is not easy to derail. In addition, the opening of the sliding block 622 is smaller than 180 degrees, so that on one hand, the installation of the sliding block 622 is facilitated, and on the other hand, the requirement for installation accuracy is reduced. During installation, the connecting assembly 620 is sleeved on the rail 120, the rail 120 is connected to the mounting seat 610 and the truss body 110, and the fixing seat 130 is connected to the claw seat 621.

In an embodiment, referring to fig. 18 and 19, the rail mounting structure further includes a fastening member 630, the mounting base 610 has a first fastening hole 611, the frame body 110 has a second fastening hole 110a, and the fastening member 630 penetrates through the first fastening hole 611 and the second fastening hole 110a to fasten and connect the mounting base 610 and the frame body 110. It should be noted that the fastening member 630 may be a bolt, a stud, a screw, a combination, a connection pair, or the like, which can achieve the fastening connection effect. The first fastening holes 611 on the mounting seat 610 with the adjustable transverse position are waist-shaped holes extending along the transverse direction of the truss body 110, or the second fastening holes 110a corresponding to the mounting seat 610 with the adjustable transverse position are waist-shaped holes extending along the transverse direction of the truss body 110. That is, the fastening holes of the mounting seat 610 or the truss body 110 may be provided with waist-shaped holes, so that the mounting seat 610 can move in the transverse direction of the truss body 110 to adjust the transverse position before the fastening member 630 fastens and connects the mounting seat 610 and the truss body 110, and thus the transverse distance between the two guide rails 120 can be adjusted, so that the transverse distance between the two guide rails 120 can meet the installation requirement.

In an embodiment, referring to fig. 23 and fig. 24, for convenience of installation, the fixing base 130 may further include a rail clip 133, the rail clip 133 is connected to the fixing base body 132 of the fixing base 130, and the claw seat 621 may be connected to the rail clip 133. Specifically, the rail mounting structure 11 includes 4 claw seats 621, and the 4 claw seats 621 are respectively connected with the 4 rail clamping plates 133 in a one-to-one correspondence manner. It should be noted that, 4 claw seats 621 are respectively connected to a sliding block 622, so that the fixing seat 130 slides up and down along the guide rail 120 more stably.

In an embodiment, referring to fig. 19 and 20, a plurality of first fastening holes 611 may be formed in the mounting base 610, and the corresponding frame body 110 may have the same number of second fastening holes 110a, and a fastening member 630 is inserted between each first fastening hole 611 and each second fastening hole 110a, so that the mounting base 610 and the frame body 110 are more stable.

In an embodiment, the vertical and horizontal position adjustment of the mounting seat 610 and the truss body 110 can be achieved by arranging a gasket, or the vertical and horizontal position adjustment of the mounting seat 610 and the truss body 110 can also be achieved by arranging a waist-shaped hole. In one embodiment, one of the adjustable mounting seat 610 and the truss body 110 has a slide rail, and the other of the adjustable mounting seat 610 and the truss body 110 has a slide groove extending in the transverse direction of the truss body 110, and the slide rail is slidably engaged with the slide groove. That is, the lateral position of the mounting seat 610 relative to the truss body 110 may be adjusted by providing a sliding groove and a sliding rail extending laterally therebetween. When the mounting seat 610 with the adjustable transverse position slides to adjust the transverse distance between the two guide rails 120, the mounting seat 610 with the adjustable transverse position is welded with the truss body 110. When the components are installed, the installation base 610 can transversely slide to a proper position to adjust the transverse distance between the two guide rails 120, and the adjusted installation base 610 is fixed by welding with the truss body 110, so that the guide rails 120 and the fixed base 130 are stabilized.

In one embodiment, one of the vertically adjustable mounting seat 610 and the truss body 110 has a slide rail, and the other of the vertically adjustable mounting seat 610 and the truss body 110 has a slide groove extending vertically along the truss body 110, and the slide rail is slidably engaged with the slide groove. That is, the vertical position of the mounting seat 610 relative to the truss body 110 may be adjusted by providing a sliding groove and a sliding rail extending vertically therebetween. When the mounting seat 610 with the adjustable vertical position slides to adjust the vertical distance between the two guide rails 120, the mounting seat 610 with the adjustable vertical position is welded to the truss body 110. The vertical sliding during installation can meet the requirement of the vertical distance between the two guide rails 120, and the purpose of stabilizing the slide rail and the fixing seat 130 can be achieved through welding after installation.

In an embodiment, as shown in fig. 1 to 7, the pipe stringing vehicle includes a working platform 140 and a hoisting mechanism 200, the hoisting mechanism 200 includes a hoisting machine 210 and a steel wire rope wound on the hoisting machine 210, the hoisting machine 210 is disposed on the fixing base 130, the hoisting machine 210 may also be disposed inside the fixing base 130, the working platform 140 has a storage state stored on the fixing base 130 and a working state suspended below the fixing base 130, and the steel wire rope drives the working platform 140 to switch between the storage state and the working state by winding and unwinding.

Therefore, the pipe stringing vehicle is in an installation state, the working platform 140 is in a working state, namely the working platform 140 is suspended below the fixed seat 130 through lowering of the steel wire rope so as to facilitate operation; the pipe string car is in the transport condition, and work platform 140 is in the state of accomodating, also is to accomodate work platform 140 on fixing base 130 through wire rope's roll-up promptly, avoids under the transport condition because work platform 140's setting makes the outstanding overlength of afterbody of pipe string car, influences driving safety.

In one embodiment, as shown in fig. 1 to 7, the hoisting mechanism 200 includes a first guide wheel 230 and a first hanging portion, the first hanging portion includes a first hanging member and a second hanging member, the first guide wheel 230 is disposed on the working platform 140, the first hanging member is disposed on the fixing base 130, the second hanging member is connected to one end of the steel wire rope, one end of the steel wire rope connected to the second hanging member bypasses the first guide wheel 230, the second hanging member is hung to the first hanging member, that is, the steel wire rope can be hung to the fixing base 130 through the first hanging portion, the first guide wheel 230 is disposed on the working platform 140, one end of the steel wire rope connected to the second hanging member bypasses the first guide wheel 230, the first guide wheel 230 plays a guiding role to guide the steel wire rope, the first guide wheel 230 is a movable pulley, and the steel wire rope is hung to the fixing base 130 after bypassing under the first guide wheel 230. When the winch 210 rotates to hoist the wire rope, the wire rope drags the first guide wheel 230 by winding and unwinding, so that the working platform 140 ascends to a storage state to enhance driving safety, or the working platform 140 descends to a working state to facilitate working of an operator. In addition, the design of the movable pulley enables the tensile force borne by the steel wire rope to be halved, and safety is ensured.

In an embodiment, the second hanging member may be a hook, the first hanging member may be a hook, a hanging ring, a hanging rod, or other objects that can cooperate with the hook of the second hanging member to realize the hanging of the steel wire rope with the fixing base 130, and the first guiding wheel 230 may be disposed at the bottom of the working platform 140, or the first guiding wheel 230 may be disposed at the top of the working platform 140.

In an embodiment, referring to fig. 5, the working platform retracting structure 12 further includes a second guiding wheel 220, the second guiding wheel 220 is disposed on the fixing base 130, the second guiding wheel 125 is a fixed pulley, the steel wire rope is wound around the second guiding wheel 220, and the second guiding wheel 220 plays a role in guiding and promoting the retracting of the steel wire rope.

In an embodiment, the working platform retracting structure 12 further includes a second hooking portion, that is, the working platform retracting structure 12 may further include only the second hooking portion, a guide wheel is not required to be disposed, the second hooking portion includes a third hooking member and a fourth hooking member, the third hooking member is disposed at the top of the working platform 140, the fourth hooking member is connected with one end of the steel wire rope, the fourth hooking member is hooked with the third hooking member, so as to directly hook the steel wire rope with the working platform 140, the steel wire rope is hoisted by the hoist 210, so that the steel wire rope drives the working platform 140 to ascend or descend by retracting and releasing, and the service length of the steel wire rope can be greatly shortened under the condition that the steel wire rope meets the safety requirement.

In an embodiment, referring to fig. 1 to 7, the working platform 140 is a working basket, that is, the working platform 140 may be a basket structure, which enables the safety of the worker during working to be higher. When the working platform 140 is in the storage state, at least a part of the structure of the fixing base 130 is located in the working basket, that is, in the storage state, the working basket can wrap at least a part of the structure of the fixing base 130, so that the driving safety can be further enhanced.

In one embodiment, referring to fig. 1-4 and 25-27, the pipe string cart includes a pipe string claw 700; the pipe string jaw 700 is provided on the girder body 110 for fixing the girder body 110 with the pipe string 900.

Specifically, the pipe string vehicle mainly transports the pipe string 900, and in the transportation process, the pipe string 900 is fixed on the truss body 110 through the pipe string clamping jaw 700 and arrives at an operation place, and after the truss body 11 rotates around the vehicle body 100 to be in a vertical state during wellhead operation, the pipe string clamping jaw 700 is loosened, the pipe string 900 is put down, and then the pipe string vehicle is matched with various operation tools and continuous pipes for installation.

Referring to fig. 25 to 27, the pipe string jaw 700 includes: a base 71, two claw poles 72, and a claw cylinder 73; one end of each claw pole 72 is provided with a first supporting leg 721 and a second supporting leg 722, and the first supporting leg 721 is hinged with the base 71 at a first hinge point 723; the two claw poles 72 are oppositely arranged and can be in an opening state or a holding state relative to the base 71; two ends of the claw oil cylinder 73 are respectively hinged with the second support legs 722 of the two claw poles 72 at a second hinge point 724; the claw cylinder 73 can drive the two claw poles 72 to be switched between an opening state and a holding state; in one claw pole 72, an included angle G is formed between a connecting line of the first hinge point 723 and the second hinge point 724 and the axial direction of the claw cylinder 73; in the process of switching the two claw poles 72 from the clasping state to the opening state, the included angle G is gradually increased.

One end of each claw pole 72 is provided with a first supporting leg 721 and a second supporting leg 722, the first supporting leg 721 and the base 71 are hinged at a first hinge point 723, that is, the claw poles 72 can rotate around the first hinge point 723, the two claw poles 72 are arranged oppositely, when one ends of the two claw poles 72, which are far away from the first hinge point 723, rotate to be close to each other, that is, a hugging state relative to the base 71 can be realized, and at this time, the tube string 900 can be effectively limited in the circumferential direction to prevent the tube string from moving around; when the ends of the two claw poles 72 far from the first hinge point 723 rotate to be far away from each other, the pipe string 900 can be separated from the truss body 110, and the claw poles 72 are no longer limited with respect to the base 71.

The two ends of the jaw cylinder 73 along the axial direction are respectively hinged with the second support legs 722 of the two jaw poles 72 at a second hinge point 724, and the axial direction of the jaw cylinder body 31 of the jaw cylinder 73 is the axial direction; the claw cylinder 73 can drive the two claw poles 72 to be switched between an opening state and a holding state; that is, by controlling the entire length of the jaw cylinder 73, the length change between the second hinge points 724 of the second legs 722 of the two jaws 72 is achieved, and since the first legs 721 are hinge-coupled to the first hinge points 723 with the base 71, the length between the first hinge points 723 of the first legs 721 of the two jaws 72 is fixed, thereby achieving the rotation of the jaws 72 about the first hinge points 723 with respect to the base 71.

In one claw pole 72, an included angle G is formed between a connecting line of the first hinge point 723 and the second hinge point 724 and the axial direction of the claw cylinder 73; in the process of switching the two claw poles 72 from the clasping state to the opening state, the included angle G is gradually increased.

Referring to fig. 1 to 4, 25 and 27, when the entire length of the claw cylinder 73 is shortened, the length between the second hinge points 724 of the second support legs 722 of the two claw poles 72 is shortened, the second support leg 722 of the left claw pole 72 drives the entire body to rotate counterclockwise around the first hinge point 723 of the first support leg 721, and the second support leg 722 of the right claw pole 72 drives the entire body to rotate clockwise around the first hinge point 723 of the first support leg 721; a connecting line of the first hinge point 723 and the second hinge point 724 of each claw pole 72 forms an included angle G with the axial direction of the claw cylinder 73; the two claw poles 72 are switched from the holding state to the opening state, the included angle G is gradually increased, the claw poles 72 do not limit the pipe string 900 any more, and the pipe string 900 can be separated relative to the truss body 110.

On the contrary, when the overall length of the claw cylinder 73 is longer, the length between the second hinge points 724 of the second support legs 722 of the two claws 72 is longer, the second support leg 722 of the claw 72 on the left side drives the whole to rotate clockwise around the first hinge point 723 of the first support leg 721, the second support leg 722 of the claw 72 on the right side drives the whole to rotate counterclockwise around the first hinge point 723 of the first support leg 721, and a connecting line between the first hinge point 723 and the second hinge point 724 of each claw 72 forms an included angle G with the axial direction of the claw cylinder 73; two claw utmost point 72 switch from opening the state to holding tightly the state, and contained angle G reduces gradually, and claw utmost point 72 is effectual carries out ascending spacing circumferentially to string of tubes 900, prevents its indiscriminate move.

It should be understood that the angle G of one claw pole 72 is the angle formed by the connection line of the first hinge point 723 and the second hinge point 724 and the axis of the claw cylinder 73, and the opening is aligned with the angle of the other claw pole 72. The included angle may be an acute angle or an obtuse angle.

In the related technology, one claw pole controls the opening and closing of the pipe string through one claw oil cylinder, the two claw poles need the two claw oil cylinders to act in a matched mode, however, if the two claw poles are asynchronous, after one claw pole is in place to clamp the pipe string, the other claw pole is probably not in place, the pipe string is not fixed firmly in the circumferential direction, and potential safety hazards exist. In the related technology, one pipe string clamping jaw needs to be controlled by two clamping jaw oil cylinders, and each clamping jaw oil cylinder needs to be controlled by a corresponding control valve and connected with a long hydraulic pipeline, so that the whole hydraulic system of the pipe string vehicle is complex and high in cost.

In the embodiment of the application, the length between the second hinge points 724 of the second support legs 722 of the two claw poles 72 is controlled by one claw oil cylinder 73, so that the two claw poles 72 can synchronously act, one claw pole 72 tightly holds the pipe string 900 in place, and the other claw pole 72 is driven by the claw oil cylinder 73 to tightly hold the other claw pole 72; two claw oil cylinders are avoided to act, the claw poles 72 are synchronous, corresponding control valves and hydraulic pipelines are saved by half, and therefore the hydraulic system is low in cost, simple and reliable and good in economic effect.

In one embodiment, please refer to fig. 25-27; the claw cylinder 73 includes a claw cylinder 731 and a claw piston rod 732, wherein the second leg 722 of one claw pole 72 is hinged to the claw cylinder 731, and the second leg 722 of the other claw pole 72 is hinged to the claw piston rod 732.

Specifically, the second leg 722 of one of the claw poles 72 is hinged to an end of the claw cylinder 731 away from the claw piston rod 732, and the second leg 722 of the other claw pole 72 is hinged to an end of the claw piston rod 732 away from the claw cylinder 731. The claw cylinder 731 is provided with an oil inlet and an oil outlet; when the claw cylinder 731 takes oil, the claw piston rod 732 extends out relative to the claw cylinder 731, the whole length of the claw cylinder 73 is lengthened, the length between the second hinge points 724 of the second support legs 722 of the two claw poles 72 is lengthened, the second support leg 722 of the left claw pole 72 drives the whole to rotate clockwise around the first hinge point 723 of the first support leg 721, the second support leg 722 of the right claw pole 72 drives the whole to rotate anticlockwise around the first hinge point 723 of the first support leg 721, the two claw poles 72 are switched from the opening state to the clasping state, the included angle G is gradually reduced, and the claw poles 72 effectively limit the pipe string 900 in the circumferential direction to prevent the pipe string from being disturbed. When the claw cylinder 731 is out of oil, the claw piston rod 732 retracts relative to the claw cylinder 731, the length between the second hinge points 724 of the second supporting legs 722 of the two claw poles 72 is shortened, the second supporting leg 722 of the left claw pole 72 drives the whole to rotate anticlockwise around the first hinge point 723 of the first supporting leg 721, and the second supporting leg 722 of the right claw pole 72 drives the whole to rotate clockwise around the first hinge point 723 of the first supporting leg 721; the two claw poles 72 are switched from the holding state to the opening state, the included angle G is gradually increased, the claw poles 72 do not limit the pipe string 900 any more, and the pipe string 900 can be separated relative to the truss body 110.

In one embodiment, referring to fig. 25 to 27, a positioning notch 7251 is formed at one end of the body 725 close to the first leg 721, the positioning notch 7251 may be a right-angle notch to facilitate the application of the rotation torque, the second leg 722 is a triangular plate, one corner of the second leg 722 is matched with the positioning notch 7251, that is, the corner may also be a right angle, and the two are matched in shape, so that the peripheral side of the second leg 722 can be attached to the side wall of the positioning notch 7251. The other corner of the second leg 722, remote from the first leg 721, forms a second hinge point 724.

In an embodiment, referring to fig. 25 to fig. 27, a positioning portion 726 is formed at an end of the main body 725 away from the first supporting leg 721, and the positioning portions 726 of the two claw poles 72 are mutually matched to realize fixing. The two claw poles 72 are in a tightly holding state and further locked by the positioning part 726, so that the claw oil cylinder 73 is prevented from leaking oil, and the loosening state is prevented from being changed. The positioning part 726 may be two buckles or two staggered plates, bolt holes are formed on the plates, and the two plates are aligned and then inserted into the pin shaft, so that the pipe string 900 is effectively limited in the circumferential direction.

In one embodiment, referring to fig. 25-27, the tube string claw includes a leveling pad 727, and the leveling pad 727 is disposed on the side of the body 725 of the two claw poles 72 opposite to each other. The shape of the adjusting cushion block 727 can also be a rhombus or a semi-ring, the outer side of the adjusting cushion block 727 is tightly attached to the opposite side surface of the body 725 to increase the stress area, and the inner side of the adjusting cushion block 727 is directly contacted with the peripheral side of the pipe string 900, so that the inner side is a cylindrical surface generally, and the stress is uniform. The adjusting cushion block 727 is generally a high-strength alloy such as a steel alloy, so as to adapt to a severe working environment. The adjusting cushion blocks 727 can be connected with the body 725 through bolts, so that the maintenance and the replacement are convenient, different adjusting cushion blocks 727 are selected according to different tube bundles, and the use is more flexible. The inner side of the adjusting cushion block 727 can be added with an anti-seismic cushion rubber pad as required, and is provided with anti-skid protrusions or a friction layer to avoid abrasion in the transportation process of the pipe string 900.

In one embodiment, as shown in fig. 25-27, the pipe string jaw includes a limit stop 74 fixed to the base 71, which may be bolted or welded. When the two claw poles 72 are in an opening state, the top ends of the limit stoppers 74 abut against the other side face of the body 725 of the two claw poles 72, which is arranged oppositely, so that the infinite opening of the claw poles is avoided, the claw cylinder 73 is prevented from being damaged, and the included angle G can be set to be 15-145 degrees according to the requirement. The top surface of the positive stop 74 may be a curved surface to accommodate the curvature of the other side of the body 725 of the claw 72, so that the two are subjected to a larger force area.

In one embodiment, as shown in fig. 25 to 27, during the switching of the two claws 72 from the clasping state to the opening state, the connection of the claw cylinder 73 away from the first hinge point 723 of the two claws 72, that is, the connection of the claw cylinder 73 away from the first hinge point 723 of the two claws 72 along the normal direction of the axis of the claw cylinder 73 during the switching of the pipe string claw from the clasping state to the opening state, is not fixed relative to the base 71.

The application further provides a pipe string construction method of the oil field wellhead, which comprises the following steps:

s10, pre-assembling the tube string 900. The string 900 is a tubular assembly having an axial length, and the corresponding components, such as the lubricator 920, the dynamic seal blowout preventer cartridge 930, and the static seal blowout preventer 940, etc., are pre-assembled before shipment. The lubricator 920, the dynamic seal lubricator box 930 and the static seal lubricator 940 are pre-assembled in a factory, so that the space is limited little and the construction is convenient.

And S20, placing the pipe string on the truss body of the pipe string vehicle. The pipe string 900 is placed on the truss body 110 by a crane, and the pipe string 900 is restrained by the fixing base 130, the pipe string jaw 700, the height stopper 300, the fixing member 410 as an axial stopper, and the radial stopper assembly 500.

S30, the pipe string vehicle is in an installation state, and the truss body 110 is erected on the vehicle body 100 to erect the pipe string 900. The first and

second legs

170 and 180 are unfolded and the vehicle body 100 is supported to the tire ground, and then the truss body 110 is driven to be vertically luffed to the ground through the luffing cylinder 160, in preparation for installing the working tool.

And S40, mounting the injection head at the upper end of the pipe string. The injection head is mounted at the upper end of the pipe string 900 by a crane, so that subsequent connection and assembly are facilitated.

And S50, hanging the pipe string 900. The pipe string 900 is hoisted by the crane, and the hoisting position can be the upper end of the pipe string 900.

S60, loosening the fixing of the truss body 110 and the pipe string 900, adjusting the height of the pipe string 900 from the ground to form an installation space M, and enabling the fixing seat 130 to ascend or descend along the vertical direction of the pipe string 900. Since the truss body 110 is fixed to the pipe string 900 in the transportation state, the truss body 110 should be released from the pipe string 900, for example, the pipe string jaw 700 should be released, so that the height of the pipe string 900 can be easily adjusted by the crane.

S70, the work tool is mounted to the pipe string 900 in the mounting space M. Installation of a wellhead work tool onto the string 900, such as into lubricator 920, may be facilitated by the height of the string 900 from the surface.

And S80, releasing the fixation of the pipe string 900 and the fixing piece 410, and transporting the pipe string 900 to the wellhead of the oil field. The limit of the fixed seat 130 to the pipe string 900 is released, at this time, the pipe string 900 is basically separated from the pipe string trolley, the crane bears the whole weight of the pipe string 900, the pipe string 900 provided with the injection head is lifted to the wellhead by the crane, and the corresponding installation is completed.

Between the steps of S20 and S30, a step of S21 may be further included:

and S21, the pipe string vehicle is in a transportation state, the truss body 110 is transversely placed on the vehicle body 100, and the pipe string 900 is transported to the side of the wellhead of the oil field.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe string cart for transporting and installing pipe strings, comprising:

a vehicle body;

the truss body is rotatably arranged on the vehicle body and used for fixing the pipe string;

the guide rail is connected with the truss body;

the fixed seat is connected with the guide rail in a sliding mode and is positioned at the rear end of the truss body in the traveling direction; and

the fixing piece is arranged on the fixing seat and is used for being detachably connected with the pipe string to fix the pipe string;

the pipe stringing vehicle has a transportation state and an installation state, and the truss body is transversely placed on the vehicle body in the transportation state; in the installation state, the truss body is erected, and when the truss body and the pipe string are released from fixation, the fixing seat can slide up and down along the extending direction of the truss body.

2. The pipe stringing vehicle of claim 1, comprising a height limiting device disposed on the truss body, the height limiting device being capable of abutting against the fixed seat to limit a downward sliding distance thereof.

3. The pipe stringing vehicle of claim 2, wherein the height limiting device comprises: the spring oil cylinder is arranged on the pull rod;

a piston rod of the spring oil cylinder is connected with the pull rod; the rotary seat is hinged with the pull rod, and the rotary seat is rotatably connected with the truss body to form the rotary center;

the height limiting device is configured as follows: work as the fixing base is followed the truss body rises, the fixing base promotes the roating seat winds the rotation center is rotatory, the roating seat drives the pull rod downstream, spring cylinder's piston rod is retracted, works as the fixing base is followed the truss body rises to the messenger the fixing base with the primary importance of roating seat separation, spring cylinder's piston rod outwards stretches out and drives under the elastic force effect the pull rod upward movement, the pull rod drives the roating seat resets, so that the roating seat keep can with the spacing state of fixing base butt.

4. The pipe stringing vehicle of claim 3, wherein the height limiting device comprises a plurality of rotating seats, the plurality of rotating seats are arranged at intervals along the height direction of the truss body, and each rotating seat is hinged with the pull rod to form the rotating center of each rotating seat.

5. The pipe stringing vehicle according to claim 3, wherein when the rotary seat is in the limit state, when the piston rod of the spring cylinder retracts under the action of hydraulic oil, the piston rod of the spring cylinder drives the pull rod to move downward, and the pull rod drives the rotary seat to rotate, so that the rotary seat is switched from the limit state to an avoidance state for avoiding the fixed seat.

6. The pipe string trolley according to any one of claims 1 to 5, wherein a union is arranged at the end of the pipe string, and the fixing piece is in threaded connection with the union;

the mounting is the ring flange, the ring flange includes the disk body and sets up the boss of disk body one side, the pipe cluster is provided with the one end of union is followed one side of fixing base penetrates in the fixing base, the boss is followed the opposite side that the fixing base is relative penetrates in the fixing base with union threaded connection, the disk body is located the outside of fixing base and with fixing base fastening connection.

7. The pipe string trolley according to any one of claims 1 to 5, wherein the fixing member is a lock pin cylinder, the lock pin cylinder comprises a lock pin cylinder barrel, a lock pin piston rod arranged in the lock pin cylinder barrel and a lock pin shaft arranged on the lock pin piston rod, the pipe string is radially provided with an insertion groove, and when the lock pin piston rod axially extends along the lock pin cylinder barrel, the lock pin shaft is in insertion fit with the insertion groove.

8. The pipe string cart according to any one of claims 1 to 5, wherein the pipe string cart comprises a radial limiting assembly, the radial limiting assembly comprises a first limiting member and a second limiting member, the first limiting member is clamped between the guide rail and the truss body, the second limiting member is disposed on the fixed base and located on a side of the fixed base away from the guide rail, when the truss body is loaded with a pipe string, a part of the structure of the pipe string is inserted into the fixed base, and the first limiting member and the second limiting member cooperate to limit the pipe string from moving in the radial direction.

9. The pipe stringing vehicle of any one of claims 1 to 5, wherein the pipe stringing vehicle comprises a mounting base, two sets of connecting assemblies and two of the guide rails;

the two guide rails are arranged at intervals along the transverse direction of the truss body;

the installation seats are arranged on the truss body, the installation seats are respectively arranged at two opposite ends of each guide rail along the extension direction, the installation seat on at least one guide rail can adjust the transverse position relative to the truss body so as to adjust the transverse distance between the two guide rails, and the installation seat on at least one guide rail can adjust the vertical position relative to the truss body so as to adjust the vertical distance between the two guide rails;

the two sets of connecting assemblies are in one-to-one corresponding sliding connection with the two guide rails;

the fixing seat is connected with the two sets of connecting components.

10. The pipe stringing vehicle of any one of claims 1 to 5, wherein the pipe stringing vehicle comprises a work platform and a hoisting mechanism;

the hoisting mechanism comprises a hoisting machine and a steel wire rope wound on the hoisting machine, the hoisting machine is arranged on the fixed seat, the working platform has an accommodating state of being accommodated on the fixed seat and a working state of being suspended below the fixed seat, and the steel wire rope drives the working platform to be switched between the accommodating state and the working state by retracting and releasing;

the pipe string car is in under the transportation state, work platform is in the state of accomodating, the pipe string car is in the installation state, work platform is in operating condition.

11. The pipe stringing vehicle of any one of claims 1 to 5, comprising a pipe stringing jaw disposed on the truss body, the pipe stringing jaw comprising: the device comprises a base, two claw poles and a claw oil cylinder;

one end of each claw pole is provided with a first supporting leg and a second supporting leg, and the first supporting leg is hinged to the base at a first hinge point; the two claw poles are oppositely arranged and can be in an open state or a holding state relative to the base;

two ends of the claw oil cylinder are respectively hinged with the second support legs of the two claw poles at a second hinge point; the claw oil cylinder can drive the two claw poles to be switched between an opening state and a holding state.

12. A pipe string construction method of an oil field wellhead is characterized by comprising the following steps:

pre-assembling a pipe string;

securing the pipe string to the truss body of the pipe string cart of any one of claims 1-11;

the pipe string trolley is in an installation state, and the truss body is erected so that the pipe string can be erected;

installing an injection head at the upper end of the pipe string;

hanging the pipe string;

loosening the fixing of the truss body and the pipe string, adjusting the height of the pipe string from the ground to form an installation space, and enabling the fixing seat to ascend or descend along the vertical direction along with the pipe string;

mounting a work tool to the pipe string within the mounting space;

and releasing the fixation of the pipe string and the fixing piece, and transporting the pipe string to a wellhead of the oil field.