CN112360376A - Blowout prevention check valve in spiral drill column - Google Patents
Blowout prevention check valve in spiral drill column Download PDFInfo
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- CN112360376A CN112360376A CN202011435174.2A CN202011435174A CN112360376A CN 112360376 A CN112360376 A CN 112360376A CN 202011435174 A CN202011435174 A CN 202011435174A CN 112360376 A CN112360376 A CN 112360376A
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- 230000002265 prevention Effects 0.000 title claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 68
- 238000005192 partition Methods 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims description 52
- 238000012423 maintenance Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000003345 natural gas Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Check Valves (AREA)
Abstract
The invention relates to the oil and natural gas drilling technology, in particular to a screw type internal blowout prevention check valve of a drill string, which comprises an upper shell and a lower shell which are connected with each other, wherein a valve seat is arranged in the upper shell, the valve seat comprises a first partition plate and a cylindrical inner wall, a first overflowing hole is arranged on the first partition plate, a second overflowing hole is arranged on the cylindrical inner wall, and a screw hole is arranged in the middle of the valve seat; a screw is assembled in the screw hole, and the screw hole and the screw thread of the screw are matched with each other and do not meet the self-locking condition; the lower end of the screw is fixedly connected with a valve core, the valve core is provided with a cylindrical outer wall, a third overflowing hole is formed in the cylindrical outer wall, and a limiting step is arranged at the bottom of the valve core; the lower shell is internally provided with a second partition plate, the second partition plate is provided with a fourth overflowing hole, and the middle part of the second partition plate is provided with a limiting seat. The invention greatly prolongs the service life of the equipment on the premise of ensuring the safety function of the check valve, solves the problems of impact load of the valve core and structural vibration damage, improves the overall safety of a drill column and an underground tool, improves the drilling operation efficiency and reduces the maintenance cost.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling equipment, in particular to an anti-blowout check valve in a spiral drill string.
Background
In the process of drilling, workover or killing construction, in order to prevent blowout or drilling fluid from flowing back, internal blowout prevention equipment and external blowout prevention equipment are used at the same time; for internal blowout prevention equipment, a cock type or piston type check valve device is usually used on site, the check valve device is connected into a drill string and is put into a well while drilling, when the well bottom overflows, the check valve can seal the inner cavity of the drill string through a mechanical structure of the check valve device, so that blowout or drilling fluid is prevented from flowing back and overflowing along the inner cavity of the drill string, and the check valve device plays an important role in the safety of oil and gas drilling.
As the demands for drilling efficiency and reduced drilling costs continue to increase, higher demands are also placed on the functionality of internal blowout prevention tools. During field use, the existing piston type check valves (CN106481295A, CN102877814A, CN104818960B) have obvious technical defects:
first, the spring is vulnerable to breakage. Most of the existing piston type check valves use a structure that a return spring is matched with a valve core, and the spring is usually arranged in a drilling fluid flow channel and is directly impacted by the drilling fluid; the spring which is subjected to drilling fluid scouring for a long time has quick reduction of the resetting capability, is easy to age, damage and even lose efficacy, and finally causes the invalidation of the check valve, thereby causing potential safety hazards;
second, the spool cannot be self-positioned. The existing piston type check valve mostly uses a structure that a reset spring is matched with a valve core, in the structure, the position of the valve core is kept stable by the spring, the valve core does not have a position keeping structure, once the spring fails, the valve core cannot be kept at a stable position, violent vibration can be generated under the impact of drilling fluid, not only the plugging function cannot be realized, but also the structural damage of the whole drill string can be caused by structural damage or vibration;
third, the spool action produces undesirable impact loads. The valve core stroke of the existing piston type check valve is not provided with any buffer structure, namely, each action of the valve core can generate one axial impact on a drill string, and the impact can cause the damage of the valve core and the whole structure and cause potential safety hazard; and when the drill string is also loaded with other downhole tools or precision instruments, the impact may cause damage to other equipment, causing unpredictable losses.
Disclosure of Invention
The invention provides a blowout prevention check valve in a spiral drill string, aiming at the technical defects that the spring of the existing piston type check valve is easy to damage, the valve core cannot realize self-positioning, and bad impact load is generated by the action of the valve core; the self-positioning mechanical structure is adopted, and a semi-closed spring can be arranged in a matched manner, so that the service life of the equipment is greatly prolonged on the premise of ensuring the safety function of the check valve, the problems of impact load of a valve core and structural vibration damage are solved, the overall safety of a drill column and an underground tool is improved, the drilling operation efficiency is improved, and the maintenance cost is reduced.
In order to achieve the above purpose, the invention provides the following technical scheme:
a blowout prevention check valve in a spiral drill string comprises an upper shell and a lower shell which are connected with each other, wherein the upper shell and the lower shell are respectively connected with the drill string;
the upper shell is internally provided with a valve seat, the valve seat comprises a first partition plate and a cylindrical inner wall, the first partition plate is provided with at least two first overflowing holes, the cylindrical inner wall is provided with at least two second overflowing holes, and the middle part of the valve seat is provided with a screw hole;
a screw rod is assembled in the screw hole, and the screw hole and the screw rod are matched with each other in thread and do not meet the self-locking condition;
the lower end of the screw is fixedly connected with the valve core, the valve core is provided with a cylindrical outer wall, at least two overflowing holes III are formed in the cylindrical outer wall, and a limiting step is arranged at the bottom of the valve core;
a second partition plate is arranged in the lower shell, at least two overflowing holes are formed in the second partition plate, and a limiting seat is arranged in the middle of the second partition plate;
the sizes of the cylindrical inner wall and the cylindrical outer wall are matched with each other so as to realize the fit and the relative rotation of the cylindrical inner wall and the cylindrical outer wall; the number and the structure of the second overflowing holes and the third overflowing holes are matched with each other, and the drilling fluid channel can be plugged and opened under the relative rotation of the cylindrical inner wall and the cylindrical outer wall.
The upper shell and the lower shell can adopt connection modes such as threaded connection, clamping connection, sleeve connection and the like, and the main technical requirement is to ensure the connection strength; the upper end of the upper shell and the lower end of the lower shell adopt the same thread as the drill string so as to be conveniently installed on the drill string;
the valve seat and the upper shell can be integrally processed and formed, and can also be manufactured in a mode of respectively processing, welding, polishing and the like, and the main technical requirement is to ensure the connection strength;
the valve seat is positioned in the upper shell, the first partition plate can be provided with at least two first overflowing holes in a drilling mode, the first overflowing holes are only used for overflowing drilling fluid, so that the distribution positions of the first overflowing holes are not strictly required, but 4-6 first overflowing holes with proper sizes are recommended to be uniformly distributed in the circumferential direction in order to ensure sufficient drilling fluid overflowing area and flowing smoothness; the valve seat main body is of a cylindrical structure, the cross section of the outer wall of the valve seat main body can be square, round and the like, and the valve seat main body is not strictly required, but the inner wall of the valve seat main body is of a cylindrical shape so as to be matched with the relative rotation of the valve core; meanwhile, at least two overflowing holes II are required to be formed in the cylindrical inner wall, and the overflowing holes II are uniformly distributed along the circumferential direction so as to be matched with the overflowing holes III in the side wall of the valve core to realize the plugging and opening of a drilling fluid channel;
the screw hole arranged in the middle of the valve seat and the stud assembled in the screw hole are used for connecting the valve core in a lifting manner, and the screw hole and the stud are matched by threads and cannot be self-locked (see the working principle described later in detail), namely the valve core can realize self-rotation and axial movement after being subjected to fluid pressure; therefore, if trapezoidal threads or other conventional threads are used, it is necessary to satisfy that the lead angle is smaller than the equivalent friction angle, or to use a roller screw pair (ball screw) to achieve the aforementioned function;
the valve core is connected to the lower end of the stud and can adopt various forms such as welding, riveting and the like; the cylindrical outer wall of the valve core is cylindrical and matched with the cylindrical inner wall of the valve seat so as to rotate relative to the valve seat; in a similar way, the number and the distribution positions of the second overflowing holes formed in the cylindrical outer wall of the valve core are matched with the related structures of the valve seat, so that the drilling fluid channel can be blocked and opened by matching with the valve seat;
the second partition plate in the lower shell is similar to the first partition plate, at least two fourth overflowing holes can be processed in a drilling mode, the first four overflowing holes are only used for overflowing drilling fluid, so that the distribution positions of the plurality of fourth overflowing holes are not strictly required, and 4-6 fourth overflowing holes with proper sizes are recommended to be uniformly distributed in the circumferential direction in order to ensure sufficient drilling fluid overflowing area and flowing smoothness;
in addition, the limiting step at the bottom of the valve core and the limiting seat in the lower shell respectively limit the upward moving distance and the downward moving distance of the valve core, so that the valve core is prevented from rotating beyond the range by matching with the threads, and the plugging and opening actions of a drilling fluid channel are guaranteed.
The working principle of the invention is as follows: the invention is driven by the drill string to go into the well, and the valve core is supposed to be in a half-open state at the moment; drilling fluid under pressure is pumped after normal drilling is started, and the drilling fluid flows from top to bottom in the drilling device; the drilling fluid sequentially passes through the first overflowing hole, the third overflowing hole, the second overflowing hole and the fourth overflowing hole, the drilling fluid generates downward pressure on the valve core, the valve core rotates forward under the pressure of the drilling fluid due to the non-self-locking fit of the screw hole and the screw rod and moves downward at the same time until the lower surface of the valve core is abutted to the limiting seat, the third overflowing hole and the second overflowing hole are overlapped at the moment, the valve core is in a fully-open state, and the overflowing area of the drilling fluid is maximized;
when blowout occurs at the bottom of the well, high-pressure fluid at the lower part surges upwards and impacts the bottom of the valve core, and due to the non-self-locking fit of the screw hole and the screw rod, the valve core rotates reversely under upward pressure and moves upwards at the same time until the limiting step is abutted against the lower end face of the valve seat, at the moment, the overflowing hole III and the overflowing hole II are staggered, the valve core is in a fully-closed state, and the overflowing area of drilling fluid is zero; the drilling fluid channel is plugged at the moment, and the liquid gushing upwards cannot pass through the valve core, so that the aim of preventing blowout is fulfilled.
Based on the above, the non-self-locking threaded connection mode between the valve core and the valve seat of the invention enables the opening and closing action of the valve core to become a progressive process of rotary movement, thus avoiding impact damage caused by the traditional structure and avoiding violent vibration of the traditional valve core under the impact of drilling fluid; in addition, the invention can cancel a return spring, is matched with an upper limit structure and a lower limit structure, can realize the function of stable opening and closing only by drilling fluid flowing up and down, improves the overall safety of a drill column and an underground tool, improves the drilling operation efficiency and reduces the maintenance cost.
As a preferable scheme of the invention, the upper shell and the lower shell are connected by screw threads.
Compared with other connection modes such as sleeving connection, clamping connection and the like, the threaded connection has the advantages that the cost is lower, a special structure does not need to be processed, the thread model same as that of a drill column can be adopted, and the threaded connection can be processed and finished on the same machine tool; in some special working condition occasions, other more suitable connection modes can be adopted.
In a preferred embodiment of the present invention, the second overflowing hole and the third overflowing hole are circular holes with equal diameters matched with each other.
The shapes of the overflowing hole II and the overflowing hole III have no special requirements, and the technical key points of the overflowing hole II and the overflowing hole III are that good superposition and dislocation can be realized, so that the opening and closing functions of the valve core are guaranteed; the circular holes with the same diameter are preferred because the circular holes are convenient to process and low in processing cost, and can be formed by drilling in a matched drilling mode at one time; of course, the second overflowing hole and the third overflowing hole can be machined into rectangular holes or variable-diameter holes according to different actual conditions.
As a preferable scheme of the invention, both the screw hole and the screw rod adopt trapezoidal threads.
To realize the non-self-locking function, trapezoidal threads with a lead angle smaller than an equivalent friction angle or other conventional threads can be adopted, or a roller screw pair (ball screw) is adopted to realize the function; trapezoidal threads are preferred because they have better mechanical strength and service life than conventional triangular threads, and they are less expensive to manufacture than roller screw pairs and have suitable overall properties.
As a preferable scheme of the invention, a first spring counter bore is arranged in the middle of the limiting seat, a second spring counter bore is arranged in the middle of the bottom surface of the valve core, and a return spring is arranged between the first spring counter bore and the second spring counter bore.
Although the function of the present invention is realized without providing a return spring, the return spring can certainly improve the stability of the present invention, and particularly can further reduce the impact and vibration to which the valve core is subjected, so the addition of the return spring is preferable. The spring is assembled in a semi-closed manner by particularly arranging the first spring counter bore and the second spring counter bore, so that the spring is prevented from being eroded by drilling fluid as much as possible, and the service life of the spring is further prolonged; when the valve core is in a fully open state, the lower surface of the valve core seals the return spring in the first counter bore, so that the return spring is prevented from being directly eroded by drilling fluid; even under the condition that the fluid normally flows, the return spring is positioned outside the drilling fluid flow area (the flow area is positioned outside the valve core), so that the drilling fluid in the range of the return spring has a low flow speed and is not easy to erode and damage.
As a preferable scheme of the invention, four overflowing holes I are uniformly distributed on the first partition plate along the circumferential direction.
In order to ensure sufficient drilling fluid flow area and flow smoothness, four flow holes I with proper sizes are preferably uniformly distributed along the circumference of the first partition plate.
As a preferable scheme of the invention, four overflowing holes II are uniformly distributed on the cylindrical inner wall along the circumferential direction.
In order to ensure sufficient drilling fluid overflowing area and flowing smoothness, four overflowing holes II with proper sizes are preferably uniformly distributed along the circumference of the cylindrical inner wall.
As a preferable scheme of the invention, four overflowing holes III are uniformly distributed on the cylindrical outer wall along the circumferential direction.
In order to ensure sufficient drilling fluid overflowing area and flowing smoothness and to match the number and layout of the overflowing holes II, four overflowing holes III with proper sizes are preferably uniformly distributed and arranged along the circumference of the cylindrical outer wall.
As a preferable scheme of the invention, four overflowing holes are uniformly distributed in the second partition plate along the circumferential direction.
In order to ensure sufficient drilling fluid overflowing area and flowing smoothness, four overflowing holes with proper sizes are preferably uniformly distributed and arranged along the circumferential direction of the second partition plate.
The invention has the beneficial effects that: the self-positioning threaded structure is adopted, and a semi-closed spring can be arranged in a matched manner, so that the service life of the equipment is greatly prolonged on the premise of ensuring the safety function of the check valve, the problems of impact load of a valve core and structural vibration damage are solved, the overall safety of a drill column and an underground tool is improved, the drilling operation efficiency is improved, and the maintenance cost is reduced.
Description of the drawings:
FIG. 1 is a schematic structural view of a fully open state of a blowout preventer check valve in a helical drill string according to the present invention.
Fig. 2 is a sectional view a-a in fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
Fig. 4 is a cross-sectional view C-C of fig. 1.
FIG. 5 is a schematic structural view of a fully closed state of a blowout preventer check valve in a helical drill string according to the present invention.
FIG. 6 is a cross-sectional view A1-A1 of FIG. 5.
Fig. 7 is a schematic diagram of a fully-open state structure of the second embodiment.
Fig. 8 is a schematic structural diagram of a fully-off state in the second embodiment.
The reference signs are: 101-upper housing, 102-lower housing, 103-drill string, 1-valve seat, 11-first partition plate, 12-cylindrical inner wall, 13-first overflowing hole, 14-second overflowing hole, 15-screw hole, 2-valve core, 21-screw rod, 22-cylindrical outer wall, 23-third overflowing hole, 24-limiting step, 25-second spring counter bore, 3-second partition plate, 31-fourth overflowing hole, 32-limiting seat, 321-first spring counter bore and 4-return spring.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example one
As shown in fig. 1, the internal blowout prevention check valve of the spiral drill string comprises an upper shell 101 and a lower shell 102 which are connected with each other, wherein the upper shell 101 and the lower shell 102 are respectively connected with a drill string 103; the upper and lower ends of the upper and lower housings 101 and 102 are threaded as the drill string 103 to reduce manufacturing costs.
As shown in fig. 1-4, a valve seat 1 is arranged in an upper shell 101, and the valve seat 1 and the upper shell 101 are integrally formed; the valve seat 1 comprises a first partition plate 11 and a cylindrical inner wall 12, four overflowing holes I13 are uniformly formed in the first partition plate 11 along the circumferential direction, four overflowing holes II 14 are uniformly formed in the cylindrical inner wall 12 along the circumferential direction, and a screw hole 15 is formed in the middle of the valve seat 1;
a screw 21 is assembled in the screw hole 15, the screw hole 15 and the screw 21 adopt trapezoidal threads, and the thread lead angle of the trapezoidal threads is smaller than the equivalent friction angle, namely, the non-self-locking condition is met;
the lower end of the screw 21 is fixedly connected with the valve core 2, four overflowing holes III 23 are uniformly arranged on the cylindrical outer wall 22 of the valve core 2 along the circumferential direction, and the bottom of the valve core 2 is provided with a limiting step 24;
a second partition plate 3 is arranged in the lower shell 102, four overflowing holes 31 are uniformly formed in the second partition plate 3 along the circumferential direction, and a limiting seat 32 is arranged in the middle of the second partition plate 3;
the sizes of the cylindrical inner wall 12 and the cylindrical outer wall 22 are matched with each other so as to realize the fit and relative rotation of the two; the number of the second overflowing holes 14 and the third overflowing holes 23 is four, circular holes with equal diameters are adopted, the circular holes can be drilled in one step in a drilling matching mode, and the two overflowing holes can be well overlapped and dislocated, so that the opening and closing functions of the valve core 2 are guaranteed;
four overflowing holes four 31 are uniformly formed in the second partition plate 3 along the circumferential direction.
The working principle of the invention is as follows: as shown in fig. 1-4, the present invention is run downhole with the drill string 103, assuming the spool 2 is now in a half-open state; drilling fluid under pressure is pumped after normal drilling is started, and the drilling fluid flows from top to bottom in the drilling device; the drilling fluid sequentially passes through the first overflowing hole 13, the third overflowing hole 23, the second overflowing hole 14 and the fourth overflowing hole 31, the drilling fluid generates downward pressure on the valve core 2, due to the non-self-locking fit of the screw hole 15 and the screw 21, the valve core 2 rotates forward under the pressure of the drilling fluid and moves downward at the same time until the lower surface of the valve core 2 abuts against the limiting seat 32, the third overflowing hole 23 and the second overflowing hole 14 are overlapped at the moment, the valve core 2 is in a fully open state, and the overflowing area of the drilling fluid is maximized;
as shown in fig. 5-6, when a blowout occurs at the bottom of a well, high-pressure fluid at the lower part surges upwards and impacts the bottom 2 of the valve core, due to the non-self-locking fit of the screw hole 15 and the screw 21, the valve core 2 rotates reversely under the upward pressure and moves upwards at the same time until the limiting step 24 abuts against the lower end face of the valve seat 1, at the moment, the three overflowing holes 23 and the two overflowing holes 14 are dislocated, the valve core 2 is in a fully-closed state, and the overflowing area of drilling fluid is zero; namely, the drilling fluid channel is blocked at the moment, and the liquid gushing upwards cannot pass through the valve core 2, so that the aim of preventing blowout is fulfilled.
The non-self-locking threaded connection mode between the valve core 2 and the valve seat 1 enables the opening and closing action of the valve core 2 to become a progressive process of rotary movement, so that impact damage caused by a traditional structure is avoided, and severe vibration of the traditional valve core under the impact of drilling fluid is also avoided; in addition, the invention can realize the function of stable opening and closing only by the drilling fluid flowing up and down without arranging a return spring and matching with an upper limiting structure and a lower limiting structure, thereby improving the overall safety of the drill stem 103 and the downhole tool, improving the drilling operation efficiency and reducing the maintenance cost.
Example two
As shown in fig. 7-8, the difference between the present embodiment and the first embodiment is that a spring counterbore 321 is arranged in the middle of the limit seat 32, a second spring counterbore 25 is arranged in the middle of the bottom surface of the valve core 2, and a return spring 4 is arranged between the first spring counterbore 321 and the second spring counterbore 25.
Although the function of the present invention is realized without providing the return spring 4, the return spring 4 can certainly improve the stability of the present invention, and particularly can further reduce the impact and the vibration received by the valve core 2, so the return spring 4 is preferably added; the first spring counterbore 321 and the second spring counterbore 25 are specially arranged to semi-closely assemble the return spring 4, so that the return spring 4 is prevented from being eroded by drilling fluid as much as possible, and the service life of the spring is further prolonged.
When the valve core 2 is in a fully open state, the lower surface of the valve core 2 seals the return spring 4 in the spring counterbore I321, so that the return spring 4 is prevented from being directly eroded by drilling fluid; even under the condition that the fluid normally flows, the return spring 4 is positioned outside the drilling fluid flow area (the flow area is positioned outside the valve core 2), so that the drilling fluid flow speed in the range of the return spring 4 is very low, and the erosion damage is not easy to occur.
All of the features disclosed above, or all of the steps in any method or process disclosed, may be combined in any combination, except features and/or steps that are mutually exclusive.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A blowout prevention check valve in a spiral drill string is characterized by comprising an upper shell (101) and a lower shell (102) which are connected with each other, wherein the upper shell (101) and the lower shell (102) are respectively connected with the drill string (103);
a valve seat (1) is arranged in the upper shell (101), the valve seat (1) comprises a first partition plate (11) and a cylindrical inner wall (12), at least two overflowing holes I (13) are formed in the first partition plate (11), at least two overflowing holes II (14) are formed in the cylindrical inner wall (12), and a screw hole (15) is formed in the middle of the valve seat (1);
a screw rod (21) is assembled in the screw hole (15), and the screw threads of the screw hole (15) and the screw rod (21) are matched with each other and do not meet the self-locking condition;
the lower end of the screw rod (21) is fixedly connected with the valve core (2), the valve core (2) is provided with a cylindrical outer wall (22), at least two overflowing holes III (23) are formed in the cylindrical outer wall (22), and a limiting step (24) is arranged at the bottom of the valve core (2);
a second partition plate (3) is arranged in the lower shell (102), at least two overflowing holes (31) are formed in the second partition plate (3), and a limiting seat (32) is arranged in the middle of the second partition plate (3);
the cylindrical inner wall (12) and the cylindrical outer wall (22) are matched in size so as to realize fit and relative rotation of the two; the number and the structure of the second overflowing holes (14) and the third overflowing holes (23) are matched with each other, so that the drilling fluid channel is blocked and opened.
2. A spiral drill string internal blow out preventer check valve according to claim 1, wherein a threaded connection is used between the upper casing (101) and the lower casing (102).
3. A spiral drill string internal blow out prevention check valve as recited in claim 1 wherein the second (14) and third (23) flowthrough holes are matched circular holes of equal diameter.
4. A screw-in-drill-string internal blow-out prevention check valve according to claim 1, wherein the bolt hole (15) and the screw (21) are both trapezoidal threads.
5. A spiral drill string internal blowout prevention check valve according to claim 1, wherein a first spring counterbore (321) is arranged in the middle of the limiting seat (32), a second spring counterbore (25) is arranged in the middle of the bottom surface of the valve core (2), and a return spring (4) is arranged between the first spring counterbore (321) and the second spring counterbore (25).
6. A screw-type internal blowout control check valve according to any one of claims 1 to 5, wherein four overflowing holes I (13) are uniformly distributed on the first partition plate (11) along the circumferential direction.
7. A screw-type internal drill string internal blow out preventer check valve according to any one of claims 1-5, characterized in that four of said flowthrough holes two (14) are circumferentially distributed in said cylindrical inner wall (12).
8. A spiral drill string internal blow out prevention check valve according to claim 7, wherein four flow holes three (23) are circumferentially distributed in the cylindrical outer wall (22).
9. A screw-type internal blowout control check valve according to any one of claims 1 to 5, wherein four overflowing holes IV (31) are uniformly distributed on the second partition plate (3) along the circumferential direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435174.2A CN112360376B (en) | 2020-12-10 | 2020-12-10 | Blowout prevention check valve in spiral drill column |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011435174.2A CN112360376B (en) | 2020-12-10 | 2020-12-10 | Blowout prevention check valve in spiral drill column |
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| CN112360376A true CN112360376A (en) | 2021-02-12 |
| CN112360376B CN112360376B (en) | 2022-02-15 |
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