Over-pump pressure guiding tool

Abstract

A pump pressure guiding tool belongs to the technical field of oil production process. The tool can be directly connected to the lower end of the production string oil pump, and the lower end of the tool can be connected to the blocking string. The tool is designed with two sets of lock block mechanisms: a threaded sleeve, an upper joint, an upper lock block, and a lock block outer sleeve form an upper lock block mechanism; a piston sleeve, a lock sleeve, a lower lock block, and a lock block outer sleeve form a lower lock block mechanism. The two sets of lock block mechanisms ensure that the pressure transmission process proceeds smoothly and the channel is not closed prematurely. Through the tool, the pressure can be transmitted to the packer to release the packer and directly put into production. The tool plays a pressure transmission function, and its principle is to lift the fixed valve ball of the plunger oil pump when lowering the string, so that the valve ball is separated from the valve seat, thereby achieving the purpose of transmitting pressure, and then releasing the lower packer. Since the lower part is a blocking structure when lowered into the well, the tool also has the function of tubing blowout prevention.

Description

Technical Field

[0001] This invention belongs to the field of oil production technology, and specifically relates to a pump-over-pressure guiding tool. Background Technology

[0002] After years of high-speed, high-intensity water injection development, the overall water cut of the oilfield has risen sharply, leading to a continuous decrease in water-driven controlled reserves. The oilfield has entered a period of ultra-high water cut development, severely impacting its normal development. Therefore, on-site work includes locating and plugging water in oil and water wells, conducting well condition surveys, and sealing high-water-cut layers during operations to ensure a good level of oilfield development.

[0003] Since conventional wells use plunger-type pumps for oil production, and the plugging tubing consists of several packers, and the structure of the pump cannot transmit pressure to the packers to release and set them, a separate plugging tubing string for high water-cut layers needs to be installed before the pump production tubing string is installed. This increases the operation and construction time, affects the rapid production cycle, and reduces economic benefits. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a pump-guided pressure tool.

[0005] The technical solution adopted in this invention is: a pump-over-pressure guiding tool, the key technical points of which are: a support rod with one end inserted into an upper connector, the support rod being threaded to one end of a threaded rod, the other end of the threaded rod being threaded to an adjusting rod, the threaded rod being screwed into a threaded sleeve inserted into the upper connector, a locking block sleeve being sleeved on the outside of the upper connector, and the head of a first shear pin screwed into the locking block sleeve being inserted into an annular groove on the upper connector to lock the position of the locking block sleeve; the upper connector limits the threaded sleeve by an upper locking block assembled in its elongated hole, and the upper connector is further limited by the locking block sleeve sleeved on its outer side, forming a first interlocking structure that fixes the threaded sleeve in place;

[0006] The threaded ring is screwed onto the inner wall of the upper connector, and a spring is installed between the threaded ring and the threaded sleeve. The second snap ring is sleeved in the groove of the threaded sleeve, and the outer circle of the second snap ring contacts the inner hole of the upper connector. When the tool is released, the second snap ring rebounds outward as the threaded sleeve moves. When the outer diameter is larger than the inner hole of the upper connector, the second snap ring snaps onto the upper connector again, limiting the threaded sleeve to remain stationary in the current position.

[0007] The locking sleeve is threaded onto the inner wall of the upper connector, the piston sleeve is inserted into the locking sleeve, and the head of the second shear pin is inserted into the annular groove on the piston sleeve to fix the piston sleeve to the outside of the threaded rod and the adjusting rod; the upper conical surface of the lower locking block, which is inserted into the long hole of the locking sleeve, contacts the upper conical surface of the locking block outer sleeve, and the piston sleeve contacts the inner arc of the lower locking block to form another second interlocking mechanism that prevents the locking block outer sleeve from moving.

[0008] The piston and piston sleeve are threaded together. One end of the connecting sleeve is threaded to the outer sleeve of the locking block, and the other end of the connecting sleeve is threaded to the lower connector. The pressure cap fitted on the upper connector is threaded to the outer sleeve of the locking block. The first retaining ring inserted in the pressure cap is also fitted on the outer wall of the upper connector. After the packer is released, the tubing is lowered and the first shear pin is cut off. Since the packer connected to the lower part of the lower connector is fixed in the position of the sleeve, the outer sleeve of the locking block and the connecting sleeve are fixed. Only the upper connector moves to the right. When the stepped protrusion J on the upper connector moves to the position of the retaining ring, the first retaining ring will retract inward and spring back, fixing the upper connector and keeping the upper locking block inside the I space of the outer sleeve of the locking block.

[0009] In the above scheme, the rotating adjusting rod is used to adjust the exposed length of the support rod to adapt to different plunger pumps.

[0010] In the above scheme, the spring has a pre-compression amount that pushes the threaded sleeve to the right end.

[0011] The beneficial effects of this invention are as follows: A pump-over pressure guiding tool can be directly connected to the lower end of the production tubing pump. Simultaneously, the lower end of the tool can be connected to the plugging tubing. The tool is designed with two sets of locking mechanisms: an upper locking mechanism consisting of a threaded sleeve, an upper connector, an upper locking block, and a locking block outer sleeve; and a lower locking mechanism consisting of a piston sleeve, a locking sleeve, a lower locking block, and a locking block outer sleeve. These two locking mechanisms ensure smooth pressure transmission without prematurely closing the passage. This tool can transmit pressure to the packer, allowing for direct production after packer release. The tool functions as a pressure transmission device by lifting the fixed valve ball of the plunger-type pump during tubing installation, causing the valve ball to detach from the valve seat, thereby achieving pressure transmission and releasing the lower packer. Since the lower part is a plugging structure during well installation, it also functions as a blowout preventer. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the pump-guided pressure tool structure in an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the plunger pump base structure in an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the construction process connection of the pump-guided pressure tool in an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the upper connector structure in an embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the threaded sleeve structure in an embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the locking block structure in an embodiment of the present invention;

[0019] Figure 7 This is a schematic diagram of the locking block outer sleeve structure in an embodiment of the present invention.

[0020] Figure 8 This is a schematic diagram of the locking sleeve structure in an embodiment of the present invention;

[0021] Figure 9 This is a schematic diagram of the lower locking block structure in an embodiment of the present invention;

[0022] Figure 10 This is a schematic diagram of the first snap ring structure in an embodiment of the present invention;

[0023] Figure 11 This is a schematic diagram of the second snap ring structure in an embodiment of the present invention;

[0024] The numbers in the diagram are explained as follows: 1. Support rod, 2. Upper connector, 3. Threaded rod, 4. Snap ring 1, 5. Pressure cap, 6. Upper locking block, 7. Threaded sleeve, 8. Snap ring 2, 9. Locking block outer sleeve, 10. Shear pin 1, 11. Locking sleeve, 12. Piston sleeve, 13. Lower locking block, 14. Piston, 15. Shear pin 2, 16. Connecting sleeve, 17. Adjusting rod, 18. Set screw, 19. Lower connector, 20. Spring, 21. Threaded ring, 22. Fixed valve ball, 23. Fixed valve seat, 24. Piston pump base. Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the following description is provided in conjunction with the accompanying drawings. Figure 1-11 The present invention will be further described in detail below with reference to specific embodiments.

[0026] The pump-guided pressure tool used in this embodiment has the following specific structure:

[0027] Support rod 1 is connected and fixed to one end of threaded rod 3 via a thread. Adjusting rod 17 is connected and fixed to the other end of threaded rod 3 via a thread. Threaded rod 3 is connected to threaded sleeve 7 via an external thread. By rotating adjusting rod 17, the exposed length of support rod 1 can be adjusted to accommodate different plunger pumps (see...). Figure 2 The threaded sleeve 7 is inserted into the upper connector 2, and the locking block outer sleeve 9 is fitted over the upper connector 2. The first shear pin 10 is threadedly fixed to the locking block outer sleeve 9, and the head of the first shear pin 10 is inserted into the annular groove H on the upper connector 2 (see...). Figure 4 (H) Lock the position of the locking block outer sleeve 9. Insert the upper locking block 6 into the elongated hole B on the upper connector 2 (see...) Figure 4 Point A on the upper locking block 6 contacts point D on the threaded sleeve 7. Because the upper locking block 6 is restricted by the locking block outer sleeve 9, it cannot move, thus forming an interlocking mechanism that fixes the threaded sleeve 7 in the position shown in the diagram. The threaded ring 21 is connected and fixed to the upper connector 2 via threads. A spring 20 is installed between the threaded ring 21 and the threaded sleeve 7 and has a certain pre-compression amount, ensuring that the threaded sleeve 7 is pushed to the right after the spring 20 is released. The second retaining spring 8 is fitted into a groove on the threaded sleeve 7, and the outer circle of the second retaining spring 8 contacts the inner hole of the upper connector 2. When the tool is released and the threaded sleeve 7 moves to point C, the second retaining spring 8 will spring back outwards. Since its outer diameter is larger than the inner hole size of the upper connector 2, the threaded sleeve 7 cannot return to its original position, thus ensuring that the support rod 1 disengages from the fixed valve ball 22 and that the plunger pump operates normally.

[0028] The locking sleeve 11 is connected and fixed to the upper connector 2 via threads; the piston sleeve 12 is simultaneously inserted into both the locking sleeve 11 and the upper connector 2; the second shear pin 15 is connected to the piston sleeve 12 via threads, and the head of the second shear pin 15 is inserted into the upper annular groove of the piston sleeve 12, fixing the piston sleeve 12 in the position shown in the figure. The lower locking block 13 is installed into the elongated hole E on the locking sleeve 11 (see figure). Figure 5 At point E in the middle, the upper conical surface of the lower locking block 13 (at point G) and the upper conical surface of the locking block outer sleeve 9 (see...) Figure 5 The piston 14 is connected and fixed to the piston sleeve 12 by threads. The locking block outer sleeve 9 cannot move, thus ensuring that the first shear pin 10 is not stressed during well lowering and release of the lower packer, allowing the pressure transmission process to proceed smoothly. The piston 14 is connected and fixed to the piston sleeve 12 by threads. One end of the connecting sleeve 16 is connected and fixed to the locking block outer sleeve 9 by threads. The lower connector 19 is connected and fixed to the other end of the connecting sleeve 16 by threads. The first snap ring 4 is fitted onto the upper connector 2 and inserted into the pressure cap 5. It is connected and fixed to the locking block outer sleeve 9 through the thread of the pressure cap 3. After the packer is released, the lower tube column is lowered and the first shear pin 10 is cut off. Since the packer connected to the lower part of the lower connector 19 is fixed in the sleeve position, the locking block outer sleeve 9 and the connecting sleeve 16 are fixed. Only the upper connector 2 can move to the right. When the J position on the upper connector 2 moves to the position of the first snap ring 4, the first snap ring 4 will retract inward and spring back, fixing the upper connector 2 in this position, so that the upper locking block 6 is always kept in the space at I.

[0029] The working principle of the pump-guided pressure tool used in this embodiment is as follows:

[0030] This tool features: anti-blowout properties for oil pipes and stable and reliable pressure transmission.

[0031] (a) Tubing blowout prevention: Since this tool is connected to the lower end of the pump, and all channels of the tool are closed when it is lowered into the well, it has the function of tubing blowout prevention.

[0032] (ii) Stable and reliable pressure transmission: The tool is designed with two sets of locking mechanisms: the upper locking mechanism consists of threaded sleeve 7, upper connector 2, upper locking block 6, and locking block outer sleeve 9; the lower locking mechanism consists of piston sleeve 12, locking sleeve 11, lower locking block 13, and locking block outer sleeve 9. These two sets of locking mechanisms ensure that the pressure transmission process proceeds smoothly and will not close the channel prematurely.

[0033] During construction, this tool is connected to the lower end of the pump, and rotating the adjusting rod 17 ensures that the fixed valve ball 22 at the bottom of the pump is lifted up (see...). Figure 3 The tool is connected to a release packer at its lower end. After the tool string is lowered to a predetermined depth, pressure is applied to the tubing. As the pressure acts on the piston sleeve 12 and piston 14, when the pressure exceeds the pressure value that the second shear pin 15 can withstand, the shear pin is cut. At this time, the piston sleeve and piston move to the right into the space inside the connecting sleeve. The pressure at the top of the piston is then transmitted to the bottom of the piston, and simultaneously to the lower packer, thus setting and releasing the packer. Due to the two sets of locking block mechanisms of this tool, the first shear pin 10 is not subjected to force during the well lowering and pressure transmission process, which ensures that the relative position of the upper connector and the locking block outer sleeve remains unchanged. At the same time, it also keeps the position of the support rod unchanged, maintaining the state of the fixed valve ball 22 of the support, thereby ensuring the unobstructed pressure transmission channel and ultimately ensuring that the packer is completely set and released. Once the packer release is confirmed, the lowered upper tubing cuts the first shear pin 10. At this point, the locking block outer sleeve 9 and the connecting sleeve 16 are fixed in place, and only the upper connector 2 can move to the right. When the J point on the upper connector 2 moves to the position of the first retaining spring 4, the first retaining spring 4 will retract inward and spring back, fixing the upper connector 2 in this position. When the upper locking block reaches the I point, the threaded sleeve moves under the action of the spring 20, simultaneously squeezing the upper locking block into the space at the I point. Since the threaded sleeve, support rod, threaded rod, and adjusting rod are a whole, they will move as a whole under the action of the spring, causing the support rod to disengage from the fixed valve ball 22 and the fixed valve ball 22 to fall onto the fixed valve ball seat 23, allowing the pump to work normally. To prevent the threaded sleeve from being pushed to the upper part and lifting the fixed valve ball 22 again under the impact of the liquid flow, a second retaining spring 8 is installed on the threaded sleeve. When the tool is released, the retaining spring will expand outward at the C point and lock there, preventing the threaded sleeve from moving to the left under the impact of the liquid flow, thus ensuring the normal operation of the pump.

[0034] Therefore, this tool has the advantages of safety and reliability, and there is no risk of being unable to pressurize again due to a malfunction of the pump truck midway, thus it has high market promotion value.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pump-guided pressure tool, characterized in that... The structure includes a support rod (1) with one end inserted into the upper connector (2), the support rod (1) being threaded to one end of a threaded rod (3), the other end of the threaded rod (3) being threaded to an adjusting rod (17), the threaded rod (3) being threaded to a threaded sleeve (7) inserted into the upper connector (2), a locking block sleeve (9) being sleeved on the upper connector (2), and the head of the first shear pin (10) being threaded to the locking block sleeve (9) being inserted into an annular groove on the upper connector (2) to lock the position of the locking block sleeve (9); the upper connector (2) limits the threaded sleeve (7) by the upper locking block (6) assembled in its long hole, the conical surface on the upper locking block (6) is in contact with the conical surface on the threaded sleeve (7), and the upper connector (2) is further limited by the locking block sleeve (9) sleeved on its outside, forming a first interlocking structure that fixes the threaded sleeve (7) in place; A threaded ring (21) is screwed onto the inner wall of the upper connector (2), and a spring (20) is installed between the threaded ring (21) and the threaded sleeve (7); a second snap ring (8) is sleeved in the groove of the threaded sleeve (7), and the outer circle of the second snap ring (8) contacts the inner hole of the upper connector (2). When the tool is released, the second snap ring (8) moves with the threaded sleeve (7), and the second snap ring (8) springs back outward. When the outer diameter is larger than the inner hole of the upper connector, the second snap ring (8) snaps back onto the upper connector (2), limiting the threaded sleeve (7) to remain stationary in the current position. The locking sleeve (11) is threaded to the inner wall of the upper connector (2), the piston sleeve (12) is inserted into the locking sleeve (11), and the head of the second shear pin (15) is inserted into the upper annular groove of the piston sleeve (12) to fix the piston sleeve (12) to the outside of the threaded rod (3) and the adjusting rod (17); the upper conical surface of the lower locking block (13) inserted into the long hole of the locking sleeve (11) contacts the upper conical surface of the locking block outer sleeve (9), and the piston sleeve (12) contacts the inner arc of the lower locking block (13) to form another second interlocking mechanism that prevents the locking block outer sleeve (9) from moving; The piston (14) is threaded to the piston sleeve (12), one end of the connecting sleeve (16) is threaded to the locking block outer sleeve (9), and the other end of the connecting sleeve (16) is threaded to the lower connector (19); the pressure cap (5) sleeved on the upper connector (2) is threaded to the locking block outer sleeve (9), and the first snap ring (4) inserted in the pressure cap (5) is also sleeved on the outer wall of the upper connector (2). After the packer is released, the lower tube column is lowered and the first shear pin (10) is cut off. Since the packer connected to the lower part of the lower connector (19) is fixed in the sleeve position, the locking block outer sleeve (9) and the connecting sleeve (16) are fixed. Only the upper connector moves to the right. When the stepped protrusion J on the upper connector moves to the position of the first snap ring (4), the first snap ring (4) will retract inward and spring back, fixing the upper connector (2) so that the upper locking block (6) is always kept in the I space of the locking block outer sleeve (9).

2. The pump-guided pressure tool as described in claim 1, characterized in that... The rotating adjusting rod (17) is used to adjust the exposed length of the support rod (1) to accommodate different plunger pumps.

3. The pump-guided pressure tool as described in claim 1, characterized in that... The spring (20) has a pre-compression amount that pushes the threaded sleeve (7) to the right end.

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