CN216553872U - Underground hydraulic power assisting device - Google Patents

Abstract

The utility model discloses an underground hydraulic power assisting device, which comprises: the hydraulic anchor device comprises an upper connector, a piston outer cylinder, a connecting sleeve, a piston cylinder, a hollow sliding seat, a lower connector, a positioning structure, a sliding locking structure and a sealing piece, wherein the upper connector is connected with the hydraulic anchor; the piston outer cylinder is connected between the upper joint and the connecting sleeve, and one end of the piston cylinder, which extends out of the connecting sleeve, is connected with the lower joint; the positioning structure is used for fixing the piston cylinder and the sliding seat, and the sliding locking structure is used for fixing the connecting sleeve, the piston cylinder and the sliding seat; the sealing element is used for being thrown into the piston cylinder and sealing an inner hole of the sliding seat, when the pressure of liquid injected into the piston cylinder reaches a certain value, the positioning structure is actively disabled, the connecting sleeve is separated from the piston cylinder through the sliding locking structure, and the sliding seat drives the piston cylinder to move downwards. The piston cylinder of the underground hydraulic power assisting device drives the lower opening anti-leakage valve to open under the driving of the sliding seat, and the anti-leakage valve of the inclined shaft can be guaranteed to open in time.

Description

Underground hydraulic power assisting device

Technical Field

The utility model relates to an auxiliary tool used in oil field oil extraction operation, in particular to a hydraulic power assisting device for assisting a downhole anti-leakage valve switching tool in acting.

Background

During well completion and workover operations, the loss phenomena of the completion fluid and the workover fluid are very common. The leakage phenomenon increases the operation cost, and causes the leakage of the completion fluid and the workover fluid to the stratum, thereby affecting the normal production and management of the oil well and causing stratum pollution. Therefore, the leakage-proof valve used in the well completion and workover processes can reduce the leakage of the completion fluid and the workover fluid to the stratum, and can isolate the stratum during the operation of the upper well section and the pipe string tripping process to be used as a barrier for temporarily abandoning the well.

In the oil extraction process, the anti-leakage valve is lowered into a wellhead along with a well completion string, after well completion, the anti-leakage valve needs to be opened if oil extraction is required directly, the anti-leakage valve needs to be kept closed if oil extraction is not required, and the anti-leakage valve also needs to be closed if the string needs to be overhauled during oil extraction. In short, the leak-proof valve needs to be opened in time when oil is extracted, and closed in time when oil is not extracted.

The anti-leakage valve is opened and closed by driving a switch tool, and patent documents with publication numbers CN205225190U and CN204002697U both disclose an anti-leakage valve switch tool, specifically, when the anti-leakage valve needs to be opened, the switch tool connected to the upper tubular column (oil pipe or drill string) of the operation well is directly pressed down mechanically to open the anti-leakage valve, and when the anti-leakage valve needs to be closed, the anti-leakage valve is automatically closed after the switch tool connected to the upper tubular column of the operation well is lifted.

The normal opening force of the leak-proof valve is generally 1-2 tons, but the existing leak-proof valve opening tool has the use disadvantage that when the force applied to the opening tool exceeds the opening force, the phenomenon that the leak-proof valve cannot be opened still occurs. This is because the anti-leakage valve can be normally opened when the shape of the well hole is similar to the vertical section shown in fig. 1, and when the shape of the well hole is shown in fig. 2, the well hole has a horizontal tail section, so that the force applied by the pipe column connected with the switching tool can be removed and can not be transmitted to the anti-leakage valve installed at the tail section, and even if the pipe column applies a large force to the anti-leakage valve at the well head, the force applied to the anti-leakage valve can not reach the opening force of the anti-leakage valve. This both had wasted the applied force to the tubular column, can not guarantee again that leak protection valve's in time opens, influenced oil recovery rhythm and oil recovery efficiency.

In conclusion, how to ensure the timely opening of the leakage-proof valve is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model aims to provide an underground hydraulic power assisting device which can ensure the timely opening of a leakage-proof valve aiming at various well hole structures.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a downhole hydraulic assist device, comprising: the hydraulic anchor device comprises an upper connector connected with a hydraulic anchor, a piston outer cylinder, a connecting sleeve, a piston cylinder inserted into the piston outer cylinder, a hollow sliding seat inserted into the piston cylinder, a lower connector connected with a leakage-proof valve switching tool, a positioning structure, a sliding locking structure and a sealing element;

the piston outer cylinder is connected between the upper joint and the connecting sleeve, and one end of the piston cylinder, which extends out of the connecting sleeve, is connected with the lower joint;

the positioning structure is used for fixing the piston cylinder and the sliding seat, and the sliding locking structure is used for fixing the connecting sleeve, the piston cylinder and the sliding seat;

the sealing element is used for being thrown into the piston cylinder and sealing an inner hole of the sliding seat, when the pressure of liquid injected into the piston cylinder reaches a certain value, the positioning structure is actively disabled, the sliding locking structure enables the connecting sleeve to be separated from the piston cylinder, and the sliding seat drives the piston cylinder to move downwards.

Further, the positioning structure includes: the positioning hole is arranged on the piston cylinder, the positioning groove is arranged on the outer wall of the sliding seat, and the positioning hole and the foldable positioning piece are inserted into the positioning hole and the positioning groove simultaneously; when the positioning structure fails, the positioning piece is broken off.

Further, the positioning holes comprise a first positioning hole and a second positioning hole, and the first positioning hole is positioned above the second positioning hole; the positioning piece comprises a first rivet and a second rivet which are riveted at the first positioning hole and the second positioning hole respectively; the locating slot comprises a first locating slot and a second locating slot which are used for containing the first rivet and the second rivet respectively.

Further, the slide lock structure includes: the locking device comprises a locking groove arranged on the inner wall of the connecting sleeve, a locking hole arranged on the piston cylinder, a locking block slide rail with a preset length arranged on the outer wall of the sliding seat and a locking block; the locking block slide way is adjacently arranged above the locking hole, and the locking block is simultaneously installed in the locking hole and the locking groove and is in contact with the outer wall of the sliding seat; when the positioning structure is invalid, the locking block is separated from the locking groove and slides along the locking block slide way.

Furthermore, the distance from the second rivet to the groove wall above the second positioning groove is greater than the distance from the first rivet to the groove wall above the first positioning groove, and is less than the length of the locking block slideway.

Further, a drain hole is formed in the piston cylinder above the first positioning hole, and the distance from the drain hole to the upper end of the sealing element is larger than the distance from the second rivet to the upper groove wall of the second positioning hole.

Further, the inner wall of adapter sleeve sets up the boss that prevents the piston cylinder deviates from, the upper end of piston cylinder outer wall set up with boss complex step.

Further, the sealing element is a ball with the diameter larger than the inner diameter of the sliding seat.

Further, the outer wall of the piston cylinder is matched with the inner wall of the outer piston cylinder at the matching position, the outer wall of the sliding seat is matched with the inner wall of the piston cylinder, sealing grooves are formed in the outer wall of the sliding seat, and sealing rings are installed in the sealing grooves.

When the anti-leakage valve needs to be opened in the oil exploitation process, if the oil well is a vertical well, downward pressure can be applied to the pipe column above the oil well, in the underground hydraulic power assisting device, the connecting sleeve and the piston cylinder are locked by the sliding locking structure, and the force applied to the pipe column can be directly applied to the lower connector connected with the piston cylinder, so that the anti-leakage valve can be opened in a traditional downward pressing mode; if the oil well is an inclined well, even when the tail section of the oil well has a horizontal section, the sliding seat is sealed through the sealing piece, liquid is injected into the piston cylinder, the piston cylinder is separated from the piston outer cylinder under the action of hydraulic pressure on the sliding seat, the piston cylinder is driven by the sliding seat to downwards press and open the anti-leakage valve, and the anti-leakage valve in a shaft of the inclined well can be timely opened.

Drawings

FIG. 1 is a vertical well;

FIG. 2 is a deviated well with a horizontal tail section;

FIG. 3 is a schematic structural view of an exemplary downhole hydraulic assist device according to the present invention in an initial position prior to use;

FIG. 4 is an enlarged view of a portion of FIG. 3 at I;

FIG. 5 is a schematic structural diagram of a downhole hydraulic assist device according to an exemplary embodiment of the present invention in a certain operating state;

FIG. 6 is an enlarged partial view taken at II in FIG. 5;

FIG. 7 is a schematic representation of a final position of a downhole hydraulic assist device in use according to an example of the present invention;

FIG. 8 is an enlarged partial view of FIG. 7 at III;

FIG. 9 is an enlarged partial view of the section IV in FIG. 7;

in the figure:

1-upper joint; 2, a piston outer cylinder; 3, connecting sleeves; 3-1-locking groove; 3-2-boss; 4, a piston cylinder; 4-1 — a first locating hole; 4-2-a second positioning hole; 4-3-a vent hole; 4-step; 5, a sliding seat; 5-1-a first positioning groove; 5-2-a second positioning groove; 5-3-locking piece slideway; 6-lower joint; 7-first rivet; 8-a second rivet; 9-locking block; 10-throwing a ball; 11-a first sealing ring; 12-second seal ring.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is described clearly and completely below with reference to the drawings in the examples of the present invention, and it is obvious that the described examples are only a part of examples of the present invention, and not all examples. All other embodiments obtained by a person skilled in the art based on examples in the present invention shall fall within the scope of protection of the present invention without making creative efforts.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish similar items and are not to be construed as requiring a particular order or sequence, and it is to be understood that such uses are interchangeable under appropriate circumstances.

In engineering practice, the opening and closing force of the anti-leakage valve does not exceed 2t generally, but in actual work, the anti-leakage valve can be opened only by pressing the opening force of 10t or even 20t to the opening and closing tool, and some platforms have no related equipment and cannot provide the larger pressing opening force.

Analysis shows that the condition generally occurs in a highly deviated well and a well with a complex well track, the azimuth angle of the well condition changes complexly, the well deviation is close to 90 degrees, the pressure loss of the underground tool is large due to the well track, and the force acting on the switch tool at the tail end of the pipe column is almost left, so that the underground tail end tool is insensitive to the down pressure applied by the well mouth.

Therefore, in order to solve the problem of opening the anti-leakage valve under the well conditions, the hydraulic pressure with small pressure loss in the bending pipe column is used for replacing the ordinary mechanical force with large pressure loss to open the anti-leakage valve, the effect that the anti-leakage valve in the inclined shaft can be opened in time without increasing the pressure of a well mouth can be achieved, the success rate of opening the anti-leakage valve by sea service personnel is improved, the dependence on platform equipment is reduced, the customer satisfaction rate is improved, and powerful support is provided for the subsequent sale of the anti-leakage valve.

As shown in the examples of fig. 3-9, there is provided a downhole hydraulic assist apparatus of the present invention, comprising: the hydraulic anchor is characterized by comprising an upper connector 1 connected with a hydraulic anchor, a piston outer cylinder 2, a connecting sleeve 3, a piston cylinder 4 inserted into the piston outer cylinder 2, a hollow sliding seat 5 inserted into the piston cylinder 4, a lower connector 6 connected with a leakage-proof valve switching tool, a positioning structure, a sliding locking structure and a piston cylinder opening sealing piece;

the piston outer cylinder 2 is connected between the upper joint 1 and the connecting sleeve 3, and one end of the piston cylinder 4 extending out of the connecting sleeve is connected with the lower joint 6;

the positioning structure is used for fixing the piston cylinder 4 and the sliding seat 5, and the sliding locking structure is used for fixing the connecting sleeve 3, the piston cylinder 4 and the sliding seat 5;

the piston cylinder opening sealing piece is used for being thrown into the piston cylinder 4 and sealing an inner hole of the sliding seat 5, when the pressure of liquid injected into the piston cylinder 4 reaches a certain value, the positioning structure is actively failed due to self damage or deformation, the connecting sleeve 3 is separated from the piston cylinder 4 through the sliding locking structure, and the sliding seat 5 drives the piston cylinder 4 to move downwards.

In order to ensure that the positioning structure is completely out of work, the sliding locking structure is used for limiting the sliding seat 5 to slide relative to the piston cylinder 4 for a preset length, and then the sliding seat 5 drives the piston cylinder 4 to move downwards.

When the anti-leakage valve needs to be opened in the oil exploitation process, if the oil well is a vertical well, downward pressure can be applied to the pipe column above the oil well, in the downhole hydraulic power assisting device of the example, the connecting sleeve 3 and the piston cylinder 4 are locked by the sliding locking structure, and the force applied to the pipe column can be directly applied to the lower joint 6 connected with the piston cylinder 4, so that the function of opening the anti-leakage valve can be realized by a traditional downward pressing mode; if the oil well is an inclined well, even if the tail section of the oil well has a horizontal section, the loss of the opening force is large due to the bending of the pipe column, the well mouth only provides the opening force of 2t, and the actual opening force obtained by the opening tool is far smaller than 2 t; at this moment, can seal sliding seat 5 through piston barrel mouth sealing member, pour into liquid into piston cylinder 4 in, through the effect of hydraulic pressure to sliding seat 5, make location structure initiative inefficacy, piston cylinder 4 breaks away from piston urceolus 2, and piston cylinder 4 pushes down under sliding seat 5 drives and opens the leak protection valve, guarantees that the leak protection valve in the inclined shaft pit shaft also can open in time. Because the bending of the pipe column does not affect the hydraulic pressure, the hydraulic pressure is used for opening the leakage-proof valve, and the opening force higher than 2t is not required to be provided generally.

In the practical use process, after the underground hydraulic power assisting device is lowered into a designated position, the switch tool is directly pushed to open the anti-leakage valve by the downward pressing of the wellhead according to the conventional operation, if the leak-proof valve cannot be opened, a piston cylinder port seal is put in, a liquid (which may be water) is injected into the piston cylinder 4, the sealing element of the piston cylinder opening and the sliding seat 5 are pressed, the hydraulic anchor is occluded with the casing wall to prevent the pipe column consisting of the upper joint 1, the piston outer cylinder 2 and the connecting sleeve 3 from moving upwards, when the pressure of the liquid injected into the piston cylinder 4 reaches a certain value, the connecting sleeve 3 and the piston cylinder 4 do not slide relatively under the action of the positioning structure, when the pressure of the liquid reaches a certain value, the positioning structure is actively disabled, under the pushing of the liquid pressure, the sliding seat 5 drives the piston cylinder 4 to move downwards, so as to drive the lower joint 6 to push the switch tool to open the leakage-proof valve.

The underground hydraulic power assisting device of the example can improve the success rate of opening the anti-leakage valve, reduce the dependence on platform equipment and improve the use experience of the anti-leakage valve.

It should be noted that the upper joint 1 is provided to connect a hydraulic anchor (not shown), and the lower joint 6 is provided to facilitate the application to the leak-proof valve opening and closing tool. The upper joint 1 and the connecting sleeve 3 of this example are connected to the upper end and the lower end of the piston outer cylinder 2, respectively.

The positioning structure of the present example includes: the positioning hole is arranged on the piston cylinder 4, the positioning groove is arranged on the outer wall of the sliding seat 5, and the foldable positioning piece is inserted into the positioning hole and the positioning groove; when the locating piece is broken off, the locating structure is invalid.

In the present example, the positioning holes include a first positioning hole 4-1 and a second positioning hole 4-2, the first positioning hole 4-1 being located above the second positioning hole 4-2; the positioning piece comprises a first pin 7 and a second pin 8 which are riveted to the first positioning hole 4-1 and the second positioning hole 4-2 respectively; the positioning grooves comprise a first positioning groove 5-1 and a second positioning groove 5-2 which are used for accommodating the first pin 7 and the second pin 8 respectively.

The first positioning groove 5-1 and the second positioning groove 5-2 can be grooves matched with the first pin 7 and the second pin 8 in shape, and can also be annular grooves arranged on the outer wall of the sliding seat 5.

The plurality of groups of pins are arranged at different heights, so that all the pins can be broken off under large liquid pressure, and the sliding seat 5 drives the piston cylinder 4 to move downwards under the action of the sliding locking structure after the sliding seat 5 slides relative to the piston cylinder 4.

The slide lock structure of the present example includes: a locking groove 3-1 arranged on the inner wall of the connecting sleeve 3, a locking hole arranged on the piston cylinder 4, a locking block slideway 5-3 with a preset length arranged on the outer wall of the sliding seat 5 and a locking block 9; the locking piece slideway 5-3 is adjacently arranged above the lock hole, and the locking piece 9 is simultaneously arranged in the lock hole and the lock groove 3-1 and is contacted with the outer wall of the sliding seat 5; when the positioning structure fails, namely when all the pins are completely broken, the locking block 9 is disengaged from the locking groove 3-1 and slides along the locking block slideway 5-3.

In this example, a plurality of lockholes can be uniformly arranged along the radial direction of the piston cylinder 4, the locking blocks 9 with the same number as the lockholes are arranged in the lockholes, when the locking blocks 9 slide along the locking block slide ways 5-3, sliding friction exists between the locking blocks 9 and the inner wall of the movable outer cylinder 2, and when all pins are completely broken, the sliding seat 5 can conveniently slide relative to the piston cylinder 4.

Preferably, the distance from the second pin 8 to the upper groove wall of the second positioning groove 5-2 is greater than the distance from the first pin 7 to the upper groove wall of the first positioning groove 5-1 and less than the length of the lock block slideway 5-3.

Referring to fig. 3-8, when the downhole hydraulic device is in the initial position, the first pin 7 and the second pin 8 are respectively in contact with the lower walls of the first positioning groove 5-1 and the second positioning groove 5-2, the width of the first positioning groove 5-1 is consistent with that of the first pin 7, and the width of the second positioning groove 5-2 is larger than that of the first positioning groove 5-1.

In order to facilitate all the pins to be broken off, a mode of breaking off the pins step by step is adopted, namely, the first pin 7 above is broken off, then the sliding seat 5 continues to slide downwards, and the second pin 8 continues to be broken off; in order to ensure that all the pins are broken, the length of the lock block slide way 5-3 is long, so that when the lowest pin is not broken, the slide seat 5 can continuously slide downwards relative to the piston cylinder 4.

In this example, the piston cylinder 4 above the first positioning hole 4-1 is provided with a discharge hole 4-3, and the distance from the discharge hole 4-3 to the upper end of the second sealing ring 12 is greater than the distance from the second rivet 8 to the upper groove wall of the second positioning groove 5-2. When the locking block 9 slides to be attached to the upper wall of the locking block slide way 5-3, and the sliding seat 5 drives the piston cylinder 4 to slide downwards to the discharge hole 4-3 to be separated from the connecting sleeve 3, at the moment, the underground hydraulic power-assisted tool of the example already acts on the leakage-proof valve switch tool, the leakage-proof valve is opened, and the discharge hole 4-3 acts on discharging liquid in the inner cavity of the piston cylinder 4.

Referring to fig. 9, the inner wall of the connecting sleeve 3 is provided with a boss 3-2 for preventing the piston cylinder 4 from coming off, and the upper end of the outer wall of the piston cylinder 4 is provided with a step 4-4 matched with the boss 3-2.

The boss 3-2 is matched with the step 4-4 to prevent the piston cylinder 4 from being separated from the piston outer cylinder 2 after the underground hydraulic power assisting device opens the anti-leakage valve.

In this example, the piston bore seal is a pitch ball 10 having a diameter greater than the inner diameter of the sliding seat 5. In another embodiment of the present invention, the maximum cross-sectional area of the ball 10 may be larger than the cross-sectional area of the hollow inner hole of the sliding seat 5.

In this example, a first sealing groove is formed at the matching position of the outer wall of the piston cylinder 4 and the inner wall of the piston outer cylinder 2, a second sealing groove is formed at the matching position of the outer wall of the sliding seat 5 and the inner wall of the piston cylinder 4, and a first sealing ring 11 and a second sealing ring 12 are respectively installed in the first sealing groove and the second sealing groove, so that the piston cylinder 4 and the piston outer cylinder 2 and the sliding seat 5 and the piston cylinder 4 are in sealing matching.

Finally, it is to be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not intended to be limiting. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model, and these changes and modifications are to be considered as within the scope of the utility model.

Claims (9)

1. A downhole hydraulic assist device, comprising: the hydraulic anchor device comprises an upper connector connected with a hydraulic anchor, a piston outer cylinder, a connecting sleeve, a piston cylinder inserted into the piston outer cylinder, a hollow sliding seat inserted into the piston cylinder, a lower connector connected with a leakage-proof valve switching tool, a positioning structure, a sliding locking structure and a sealing element;

the piston outer cylinder is connected between the upper joint and the connecting sleeve, and one end of the piston cylinder, which extends out of the connecting sleeve, is connected with the lower joint;

the positioning structure is used for fixing the piston cylinder and the sliding seat, and the sliding locking structure is used for fixing the connecting sleeve, the piston cylinder and the sliding seat;

the sealing element is used for being thrown into the piston cylinder and sealing an inner hole of the sliding seat, when the pressure of liquid injected into the piston cylinder reaches a certain value, the positioning structure is actively disabled, the sliding locking structure enables the connecting sleeve to be separated from the piston cylinder, and the sliding seat drives the piston cylinder to move downwards.

2. The downhole hydraulic assist device of claim 1, wherein the positioning structure comprises: the positioning hole is arranged on the piston cylinder, the positioning groove is arranged on the outer wall of the sliding seat, and the positioning hole and the foldable positioning piece are inserted into the positioning hole and the positioning groove simultaneously; when the positioning structure fails, the positioning piece is broken off.

3. The downhole hydraulic assist device of claim 2, wherein the alignment bore comprises a first alignment bore and a second alignment bore, the first alignment bore being located above the second alignment bore; the positioning piece comprises a first rivet and a second rivet which are riveted at the first positioning hole and the second positioning hole respectively; the locating slot comprises a first locating slot and a second locating slot which are used for containing the first rivet and the second rivet respectively.

4. The downhole hydraulic assist device of claim 3, wherein the slide lock structure comprises: the locking device comprises a locking groove arranged on the inner wall of the connecting sleeve, a locking hole arranged on the piston cylinder, a locking block slide rail with a preset length arranged on the outer wall of the sliding seat and a locking block; the locking block slide way is adjacently arranged above the locking hole, and the locking block is simultaneously installed in the locking hole and the locking groove and is in contact with the outer wall of the sliding seat; when the positioning structure is invalid, the locking block is separated from the locking groove and slides along the locking block slide way.

5. The downhole hydraulic assist device of claim 4, wherein the distance from the second rivet to the wall of the slot above the second detent is greater than the distance from the first rivet to the wall of the slot above the first detent and less than the length of the lock slide.

6. The downhole hydraulic assist device of claim 4, wherein a drain hole is provided in the piston cylinder above the positioning hole, and the distance from the drain hole to the upper end of the seal member is greater than the distance from the second rivet to the upper groove wall of the second positioning groove.

7. The underground hydraulic power assisting device according to claim 1, wherein a boss for preventing the piston cylinder from falling off is arranged on the inner wall of the connecting sleeve, and a step matched with the boss is arranged at the upper end of the outer wall of the piston cylinder.

8. The downhole hydraulic assist device of claim 1, wherein the seal is a ball having a diameter greater than an inner diameter of the sliding seat.

9. The underground hydraulic power assisting device according to claim 1, wherein sealing grooves are formed at the matching positions of the outer wall of the piston cylinder and the inner wall of the outer piston cylinder and at the matching positions of the outer wall of the sliding seat and the inner wall of the piston cylinder, and sealing rings are installed in the sealing grooves.

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