CN217813334U

CN217813334U - Multistage pin shearing adjustable expansion joint

Info

Publication number: CN217813334U
Application number: CN202122416548.2U
Authority: CN
Inventors: 赵锋叶; 赵亮; 景建平; 罗伟波
Original assignee: Baoji Changyou Petroleum Equipment Co ltd
Current assignee: Baoji Changyou Petroleum Equipment Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-11-15
Anticipated expiration: 2031-10-08

Abstract

The utility model discloses a multistage pin shearing regulation formula expansion joint, expansion joint integral connection is in the instrument cluster in the pit, and it has top connection, lower clutch be provided with the adjusting part who has the multistage regulation structure between top connection and the lower clutch, and the lower clutch receive the exogenic action down adjusting part orders about the lower clutch for the top connection freely removes. The telescopic joint can have different well descending lengths and compensation lengths through the different corresponding states of the multistage adjusting hole positions and the shearing pin holes. When the length of the oil pipe changes due to underground pressure or temperature changes, the shear pin is sheared, so that the lower joint freely creeps or moves up and down relative to the upper joint, the danger caused by overlarge axial load change is avoided, the extension and contraction of the pipe column due to the temperature or pressure change are compensated, the reliable setting of the packer is ensured, the creeping of the whole set of pipe column is reduced, and the operation is smoothly completed.

Description

Multistage shear pin adjusting type expansion joint

Technical Field

The utility model relates to a tubular column receives downhole pressure to influence technical field in the pit, especially relates to a multistage shear pin regulation formula expansion joint.

Background

In the process of underground petroleum operation, tool strings connected with different tools can be placed in the well, and the tool strings are seated on the wall of the well after being placed to the designed depth, so that the accuracy of the underground operation positions of the different tools is ensured. Due to the influence of geological environment, great underground environment difference exists in wells in different areas, such as underground pressure and temperature, the two environmental factors can cause the change of the length of an oil pipe, further the problem that a tool string and a pipe column are stretched or shrunk to be damaged due to overlarge axial load is caused, meanwhile, the change of the setting position of an underground tool and the tightness of the setting are influenced, further the smooth operation of underground operation is influenced, and great loss is caused to the pipe column and the tool.

Disclosure of Invention

To the problem that exists, the utility model aims at providing a multistage shear pin regulation formula expansion joint when the change of the oil pipe length that arouses because of downhole pressure or temperature variation for freely wriggling about the tubular column or removing, thereby avoid because of the too big danger that appears of axial load change, compensate the extension and the shrink that the tubular column appears because of temperature or pressure variation, in order to guarantee the reliable seat of packer to seal.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a multistage round pin regulation formula expansion joint which characterized in that: the expansion joint is integrally connected in the underground tool string and is provided with an upper joint and a lower joint, an adjusting component with a multi-stage adjusting structure is arranged between the upper joint and the lower joint, and the lower joint is driven by the adjusting component to move freely relative to the upper joint under the action of external force.

Preferably, the adjusting part is in proper order including connecting urceolus, adapter sleeve on the top connection, and the lower clutch top is connected with and wears to establish in proper order dabber in adapter sleeve and the urceolus the adapter sleeve is close to lower clutch one end be connected with the dabber realizes the round pin adjusting device that cuts of multilevel adjustment.

Preferably, the shear pin adjusting device is a shear pin sleeve in threaded connection with the bottom end of the connecting sleeve, a plurality of shear pin holes are formed in the shear pin sleeve along the circumferential interval, multistage adjusting hole sites matched with the shear pin holes are formed in the inner wall of the mandrel along the length direction interval, and the shear pins are arranged on the adjusting hole sites at different stages in a penetrating mode under the corresponding state of the shear pin holes.

Preferably, the multistage adjusting hole positions comprise a first-stage adjusting hole, a second-stage adjusting hole and a third-stage adjusting hole, and the top end of the lower joint is abutted against the bottom end of the shear pin sleeve in the state that the first-stage adjusting hole corresponds to the shear pin hole.

Preferably, a key is embedded in the joint of the connecting sleeve and the inner wall of the shear pin sleeve, and a limiting shoulder which is in contact with and limited by the end face of the key is arranged on the circumferential surface of the mandrel at the upper part of the three-stage adjusting hole.

Preferably, an annular space is reserved between the top end of the mandrel and the bottom end of the upper joint in a corresponding assembling state of the primary adjusting hole and the shear pin hole.

Preferably, one side of the shear pin is provided with a limit key, a limit key groove matched with the limit key to penetrate is formed in the side wall of the shear pin hole, and an auxiliary shearing groove is formed in the circumferential surface of the shear pin, which is close to one side of the upper joint.

The beneficial effects of the utility model are that: the telescopic joint can enable the telescopic joint to have different well descending lengths and compensation lengths through different corresponding states of the multistage adjusting hole positions and the shearing pin holes. When the length of the oil pipe changes due to underground pressure or temperature changes, the shear pin is sheared, so that the lower joint freely creeps or moves up and down relative to the upper joint, the danger caused by overlarge axial load change is avoided, the extension and contraction of the pipe column due to the temperature or pressure changes are compensated, the reliable setting of the packer is ensured, the creep of the whole pipe column is reduced, and the smooth operation is finished.

Drawings

Fig. 1 is the overall structure schematic diagram of the adjustable expansion joint of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1 according to the present invention.

Fig. 3 is an enlarged view of the point B in fig. 1 according to the present invention.

Fig. 4 is an enlarged view of the point C in fig. 1 according to the present invention.

Fig. 5 is a pin shearing structure diagram of the present invention.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the technical solution of the present invention with reference to the accompanying drawings and embodiments.

Referring to fig. 1-5, the multi-stage shear pin adjustable expansion joint is integrally connected in a downhole tool string, and comprises an upper joint 1 and a lower joint 10, wherein an adjusting component with a multi-stage adjusting structure is arranged between the upper joint 1 and the lower joint 10, and the adjusting component drives the lower joint 10 to freely move relative to the upper joint 1 under the action of external force applied to the lower joint 10. When the length of the oil pipe changes due to downhole pressure or temperature changes, the lower joint 10 and the downhole tool connected with the lower joint can freely creep or move up and down relative to the upper joint 1 through an adjusting part, so that the danger caused by overlarge axial load changes is avoided, the extension and contraction of the pipe column due to temperature or pressure changes are compensated, and the reliable setting of the packer is ensured.

Specifically, the adjusting part comprises an outer barrel 5 and a connecting sleeve 6 which are connected to the upper joint 1 in sequence, the top end of the lower joint 10 is connected with a mandrel 4 which sequentially penetrates through the connecting sleeve 6 and the outer barrel 5, and one end of the connecting sleeve 6, which is close to the lower joint 10, is connected with a pin shearing adjusting device which realizes multi-stage adjustment with the mandrel 4. The lower joint 10 and the mandrel 4 are kept fixed relative to the upper joint 1 and other components by the shear pin adjusting device during the downhole process, when the lower joint 10 is subjected to pressure in different downhole directions, the lower joint 10 and the mandrel 4 are released from the fixed state with the upper joint 1 and other components and are changed into a relative movement state by the shear pin adjusting device, and therefore when the lower joint 10 is subjected to downhole pressure, the lower joint 10 can freely move up and down relative to the upper joint 1 to compensate the expansion and contraction of the pipe column caused by temperature or pressure change.

It is specific, cut round pin adjusting device for threaded connection cut round pin cover 8 in 6 bottoms of adapter sleeve, cut round pin cover 8 and go up along its circumference interval and seted up a plurality of pinhole 801 of cutting, and the cooperation has been seted up along its length direction interval on the 4 inner walls of dabber cut the multistage regulation hole site of pinhole 801, different levels the regulation hole site all with cut pinhole 801 and wear to be equipped with jointly under the corresponding state and cut round pin 9. When the expansion joint is assembled before downhole, the adjustment hole sites of different stages correspond to the shear pin holes 801, and the shear pins 9 penetrate through the expansion joint to realize relative positioning, so that different lengths of the expansion joint are obtained, and then the design positions (such as setting positions of a packer) of different downhole tools can be adjusted, after downhole and under downhole pressure, the lower joint 10 pushes up or pulls down the mandrel 4, so that the adjustment hole sites of the corresponding stages are staggered with the shear pin holes 801, and then the shear pins 9 are sheared, so that the lower joint 10 and the mandrel 4 move up and down relative to the upper joint 1 under the action of downhole external force, and vertical expansion and contraction of a compensation pipe column are realized. Due to the fact that different adjusting hole positions correspond to the shear pin holes 801, different setting positions of the packer are achieved, the stroke of the compensation pipe column moving up and down can be adjusted, and the packer is suitable for use in different underground environments.

Specifically, the multistage adjusting hole locations include a first-stage adjusting hole 4A, a second-stage adjusting hole 4B, and a third-stage adjusting hole 4C, as shown in fig. 3 to 4, different stages of adjusting holes respectively correspond to the shear pin hole 801, and the telescopic joint can have different assembly (downhole) lengths.

In order to avoid the problem that the lower joint moves upwards to shear the shear pin 9 and affect the setting of the packer and the lowering position of the tool design due to the excessive upward impact pressure in the downhole process, as shown in fig. 4, the top end of the lower joint 10 is in contact with the bottom end of the shear pin sleeve 8 in a state that the primary adjusting hole 4A corresponds to the shear pin hole 801. Under this assembly structure, the top of lower clutch 10 offsets spacingly with 8 bottoms of shearing pin bushing, overcomes the drawback of shearing round pin 9 because of the external force that lower clutch 10 received is too early, also can reduce expansion joint's whole length simultaneously in the transportation, and this assembly structure is applicable to the great environment of pressure of going into the well. In an environment with low downhole pressure, the second-stage adjusting hole 4B or the third-stage adjusting hole 4C can preferably correspond to the shear pin hole 801 before downhole, and the shear pin 9 penetrates to limit the assembly structure.

In order to avoid the problem that the lower joint 10 and the mandrel 4 are separated from the upper joint 1 and other components due to too large downward moving depth, as shown in fig. 4, a key 7 is embedded in the joint of the connecting sleeve 6 and the inner wall of the shear pin sleeve 8, and a limiting shoulder 41 which is in contact with the end face of the key for limiting is arranged on the circumferential surface of the mandrel 4 at the upper part of the three-stage adjusting hole 4C. When the lower joint 10 and the mandrel 4 move downwards relative to the upper joint 1 to an excessive depth, the limiting shoulder 41 of the mandrel 4 contacts the upper end surface of the key 7, and the lower joint 10 and the mandrel 4 are further limited to move downwards continuously through the embedding and fixing effects of the connecting sleeve 6 and the shear pin sleeve 8 on the key 7, so that the downhole tool connected to the lower joint 10 is prevented from falling.

Further, in order to optimize the structure of the expansion joint, as shown in fig. 2, an annular space 101 is reserved between the top end of the mandrel 4 and the bottom end of the upper joint 1 in the state that the primary adjusting hole 4A and the shear pin hole 801 are correspondingly assembled. After the packer is set, when downhole pressure acts on the pipe string, on one hand, a downward thrust is applied to the lower pipe string, on the other hand, the annular space 101 enables the top end of the mandrel 4 to be in a piston area, pressure in the pipe string (preferably, the pressure can be pressed downwards from a well mouth or the pressure can be strung into an inner hole of a tool string) acts on the top end of the mandrel 4, the mandrel 4 is pushed downwards, the two acting forces act on the mandrel 4 together to smoothly and effectively shear the shear pin 9, so that the problem that the acting force when the shear pin 9 is pulled downwards by the lower joint 10 is small and smooth fracture cannot be realized is solved (in an actual downhole operation environment, the acting force when the lower joint 10 is pushed upwards by the downhole pressure and the mandrel 4 moves upwards is larger than the acting force when the lower joint is pulled downwards, so that the problem that the shear pin cannot be sheared due to the small acting force exists, and the auxiliary acting force is added to the downward movement of the mandrel 4 through the annular space 101, so that the shear pin can be pulled downwards and the shearing can be realized smoothly.

In order to further solve the problem of small acting force during pull-down shearing, a limit key 91 is arranged on one side of the shear pin 9, a limit key groove (not shown) which is matched with the limit key 91 to penetrate is formed in the side wall of the shear pin hole 801, and an auxiliary shearing groove 9a is formed in the circumferential surface of the shear pin 9, which is close to the upper joint 1. When the shear pin 9 is mounted, the limit key 91 is fitted into the limit key groove of the shear pin hole 801, and the auxiliary shear groove 9a is kept facing the upper joint 1. In the process of pulling down the shearing pin 9, the external force includes downhole pulling force, the self gravity of the tool, the downward pushing force generated on the top end of the mandrel 4 in the pipe column and the structure of the auxiliary shearing groove 9a for facilitating the downward pulling-down fracture of the shearing pin 9, so that the shearing pin 9 can be smoothly sheared during the downward pulling, and the free telescopic effect of the lower joint 10 relative to the upper joint 1 is realized. Meanwhile, the shear pin 9 is kept to have certain setting strength, and the packer can be guaranteed to be smoothly set.

Note: the number 2 is a pressing cap, the number 3 is a sealing component, the number 11-13 is supporting sealing, the number 14-15 is an O-shaped ring, and the number 16-17 is a setback screw. Wherein the press cap 2 is preferably screwed on the top end of the mandrel 4 for pressing the sealing component 3 tightly, a shoulder 42 is arranged on the mandrel 4 at the bottom end of the sealing component 3 for limiting the sealing component 3 together, and the sealing component 3 always keeps sliding sealing in the process that the mandrel 4 moves up and down relative to the outer cylinder 5.

The principle of the utility model is that: through the first-level adjusting hole 4A and the state that the shearing pin hole 801 corresponds, the telescopic structure is in the shortest length structure, and transportation of the telescopic structure is facilitated. Before the expansion joint is lowered, the second-stage adjusting hole 4B or the third-stage adjusting hole 4C can be made to correspond to the shear pin hole 801 and penetrate through the shear pin 9 to limit the assembly structure so as to adjust the length of the expansion joint in the well. After the well is lowered and the setting is completed, the lower joint 10 pushes up or pulls down the mandrel 4 under the downhole pressure, so that the adjusting hole positions of the corresponding stages are staggered with the shear pin holes 801, and further the shear pins 9 are sheared, thereby realizing the up-and-down movement of the lower joint 10 and the mandrel 4 relative to the upper joint 1 under the action of downhole external force to compensate the up-and-down expansion of the pipe column. Due to the fact that different adjusting hole positions correspond to the shear pin holes 801, different setting positions of the packer are achieved, the stroke of the compensation pipe column moving up and down can be adjusted, and the packer is suitable for use in different underground environments.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a multistage round pin regulation formula expansion joint which characterized in that: the expansion joint is integrally connected to a downhole tool string and is provided with an upper joint (1) and a lower joint (10), an adjusting component with a multi-stage adjusting structure is arranged between the upper joint (1) and the lower joint (10), and the adjusting component drives the lower joint (10) to freely move relative to the upper joint (1) under the action of external force on the lower joint (10).

2. The multi-stage shear pin adjustable expansion joint of claim 1, wherein: the adjusting part is in proper order including connecting urceolus (5), adapter sleeve (6) on top connection (1), and lower clutch (10) top is connected with and wears to establish in proper order dabber (4) in adapter sleeve (6) and urceolus (5) adapter sleeve (6) are close to lower clutch (10) one end be connected with dabber (4) realize the shearing round pin adjusting device of multistage regulation.

3. The multi-stage shear pin adjustable expansion joint of claim 2, wherein: cut round pin adjusting device for threaded connection cut round pin cover (8) in adapter sleeve (6) bottom, cut round pin cover (8) go up along its circumference interval and seted up a plurality of pinhole (801) of cutting, and follow its length direction interval and seted up the cooperation on dabber (4) inner wall cut the multistage regulation hole site of pinhole (801), the regulation hole site of different levels all with cut and wear to be equipped with jointly under pinhole (801) the corresponding state and cut round pin (9).

4. A multi-stage shear pin adjustable expansion joint as defined in claim 3, wherein: the multistage adjusting hole position comprises a first-stage adjusting hole (4A), a second-stage adjusting hole (4B) and a third-stage adjusting hole (4C), wherein the first-stage adjusting hole (4A) is in abutting contact with the top end of the lower joint (10) and the bottom end of the shear pin sleeve (8) in a state that the shear pin hole (801) corresponds to the first-stage adjusting hole (4A).

5. The multi-stage shear pin adjustable expansion joint of claim 4, wherein: a key (7) is embedded at the joint of the connecting sleeve (6) and the inner wall of the shear pin sleeve (8), and a limiting shoulder (41) which is in contact with the end surface of the key for limiting is arranged on the circumferential surface of the mandrel (4) at the upper part of the three-stage adjusting hole (4C).

6. The multi-stage shear pin adjustable expansion joint of claim 5, wherein: and an annular space (101) is reserved between the top end of the mandrel (4) and the bottom end of the upper joint (1) in the state that the primary adjusting hole (4A) and the shearing pin hole (801) are assembled correspondingly.

7. The multi-stage shear pin adjustable expansion joint of claim 6, wherein: a limiting key (91) is arranged on one side of the shear pin (9), a limiting key groove matched with the limiting key (91) in a penetrating mode is formed in the side wall of the shear pin hole (801), and an auxiliary shearing groove (9 a) is formed in the circumferential surface, close to the upper joint (1), of the shear pin (9).