CN219826785U

CN219826785U - RD-W internal pressurization circulation valve

Info

Publication number: CN219826785U
Application number: CN202321085280.1U
Authority: CN
Inventors: 马琳淞; 万文超; 金玉堂; 杨昆
Original assignee: Baoji Changyou Petroleum Equipment Co ltd
Current assignee: Baoji Changyou Petroleum Equipment Co ltd
Priority date: 2023-05-08
Filing date: 2023-05-08
Publication date: 2023-10-13
Anticipated expiration: 2033-05-08

Abstract

The utility model discloses an RD-W internal pressurizing circulating valve, which is provided with an upper joint outer cylinder and a lower joint which are sequentially connected, wherein a circulating hole is formed in the upper joint, a circulating mandrel for plugging the circulating hole is connected in the upper joint, and a driving mechanism and a locking structure are arranged on the circulating mandrel. The RD-W internal pressure circulation valve is simple in structure and reliable in use, and can replace liquid inside and outside a pipe column through positive and negative circulation, so that the problems that firstly, for well conditions of serious underground sand production, a circulation mandrel cannot shear a shear pin and cannot open a circulation hole due to accumulation of sand are solved; second, the rupture disc structure has avoided shearing the characteristics that the round pin structure should oneself, leads to the pressure value of shearing unable accurate control, and thirdly, locking mechanical system has solved because of the use risk of the circulation hole of going up to close of circulation mandrel, has greatly increased the probability of logging success.

Description

RD-W internal pressurization circulation valve

Technical Field

The utility model relates to the technical field of tools for logging, in particular to an RD-W internal pressurization circulation valve.

Background

The internal pressurizing circulating valve is a testing tool for circulating liquid in a well after the operation is completed, and is a supplement and expansion of the existing circulating tool. Traditional internal pressurization circulation tools such as IPO valves (circulation valve products of Halibaston, which are widely used in logging operations) are operated by the pressure of the drift diameter, and through the structural design that the internal mandrel has area difference, the mandrel shears the shear pin and opens the circulation hole downwards to realize circulation, and the main limitations are as follows:

firstly, the number of the shearing pins in the tool is relatively large, synchronous shearing cannot be achieved in the shearing process (the shearing pins are not sheared simultaneously due to the size difference in the shearing process), the pressure control cannot be very accurate, the shearing pressure is easy to approach other operation pressures, and misoperation is easy to occur;

secondly, the outer circle of the IPO valve tool is provided with four pressure transmission holes for balancing the internal pressure and the external pressure, during the operation, sand is seriously discharged at the bottom of the well, and the sand can be deposited in the pressure transmission holes, so that a mandrel cannot descend, a shear pin cannot be sheared, a circulation hole cannot be opened, and the circulation function of the tool fails;

finally, the yield strength of the material will vary with the temperature of the environment in which it is used, and the shear strength will be reduced and the shear pressure will vary, which will cause some instability in the test operation.

According to feedback of operators on the operation site, a circulating tool auxiliary test work which can be operated through pressure in a tubular column, has stable operation pressure and reliable performance is urgently needed.

Disclosure of Invention

Aiming at the problems, the utility model aims to provide the RD-W internal pressurizing circulating valve, which solves the problems that the number of shear pins in the valve body tool is relatively large, the synchronous shearing operation pressure cannot be controlled accurately in the shearing process, and the like.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a pressurization circulation valve in RD-W, the circulation valve has upper joint urceolus and lower joint that connects gradually, its characterized in that: the upper connector is provided with circulating holes along the circumferential spacing, the upper connector is internally connected with a circulating mandrel for plugging the circulating holes, the circulating mandrel is provided with a driving mechanism for driving the upper connector and the circulating mandrel to move relatively and enabling the circulating holes to be communicated, and the bottom side of the circulating mandrel is provided with a locking structure for positioning the circulating mandrel and the upper connector relatively in a circulating hole communicating state.

Specifically, a connecting shear pin is arranged between the bottom side of the upper connector and the circulating mandrel, a pressurizing cavity for driving the connecting shear pin to break is formed between the circulating mandrel and the outer cylinder as well as between the bottom end surface of the upper connector, and the driving mechanism is arranged on the circulating mandrel and communicated with the pressurizing cavity.

Preferably, the driving mechanism comprises a rupture disc seat detachably assembled on the circulating mandrel from the outer wall of the circulating mandrel towards the inner wall, the rupture disc seat is of a cylindrical structure, and a stepped hole is arranged on one side of the rupture disc seat close to the inner wall of the circulating mandrel, and the rupture disc is detachably assembled in the stepped hole.

Preferably, the middle part of the outer wall of the circulating mandrel and the inner wall of the outer cylinder are respectively provided with a mandrel step surface and an outer cylinder step surface which correspond to each other, the mandrel step surface and the outer cylinder step surface form an air chamber, and a buffer ring connected with the outer cylinder step surface is sleeved on the circulating mandrel in a ring mode.

Preferably, a pressure relief sealing element is arranged on the circulating mandrel at the bottom side of the step surface of the outer cylinder in a circumferential direction, and a pressure relief groove which can correspond to the pressure relief sealing element is formed in the inner wall at the bottom side of the outer cylinder. And the pressure relief sealing piece can be embedded into the pressure relief groove in a state that the step surface of the mandrel faces the step surface of the outer cylinder.

Preferably, the locking structure comprises locking blocks clamped between the outer cylinder and the lower connector at circumferential intervals, an annular locking groove formed in the circulating mandrel close to the pressure relief sealing element, and an annular tension spring for driving the locking blocks to be embedded into the annular locking groove is sleeved on the outer circumferential surface of the locking blocks.

The beneficial effects of the utility model are as follows: the RD-W internal pressurizing circulating valve is a tool for replacing liquid inside and outside a tubular column, and the functional defect of the traditional IPO valve for replacing liquid is effectively solved, and the problems that synchronous shearing cannot be achieved due to the fact that the number of shearing pins is large on one hand, shearing pressure cannot be accurately controlled, and the defect of the IPO valve is exactly overcome due to the structure of the rupture disc are solved; in addition, in the oil-gas well with larger sand yield, the circulating mandrel can not shear the shear pin downwards to open the circulating hole due to the accumulation of sand in the balance hole, so that the liquid replacement is failed.

According to the RD-W internal pressurizing circulating valve disclosed by the utility model, the circulating mandrel is pushed to descend by pressure to open the circulating hole, air is compressed in the descending process of the circulating mandrel, the circulating mandrel is not prevented from moving due to foreign matters, and the risk of unexpected closing of the circulating hole is avoided due to the design of the locking mechanism.

The pressurized circulation valve of the present utility model initiates pressure analysis from circulation: the rupture disc is used for breaking the rupture disc instantaneously compared with the traditional plurality of shear pins, and the plurality of shear pins are not sheared simultaneously due to the size difference in the shearing process, so that the breaking pressure of the rupture disc is more accurate than the shearing pressure of the shear pins, and a tester can operate the tool on the ground more easily.

Structural analysis from the tool: the traditional IPO valve is provided with four pressure transmission holes on the outer circle of the lower joint, the pressure between the annular space and the mandrel is mainly balanced, if the tool is used in a well with larger sand output, sand can enter the pressure transmission holes and realize deposition, and at the moment, the circulating mandrel cannot shear the shear pin to move downwards under the action of pressure difference to open the circulating hole. According to the RD-W internal pressurizing circulating valve disclosed by the utility model, due to the design of the air cavity between the circulating mandrel and the outer cylinder, the circulating mandrel descends to compress air, so that the phenomenon that the shearing pin cannot be sheared due to blocking of sand or other foreign matters does not occur in the circulating mandrel.

Drawings

FIG. 1 is a perspective view of the internal pressurization circulation valve of the present utility model.

FIG. 2 is a block diagram of the internal pressurization cycle valve of the present utility model.

Fig. 3 is an enlarged view of the structure of fig. 2a according to the present utility model.

Fig. 4 is an enlarged view of the structure of fig. 2B according to the present utility model.

Fig. 5 is an enlarged view of the structure of fig. 2 at C in accordance with the present utility model.

In the figure: 11-rectangular sealing rings; 12-16 are support seals; and 17-20 are O-shaped rings.

Detailed Description

In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model is further described below with reference to the accompanying drawings and examples.

Referring to fig. 1 to 5, there is provided an RD-W internal pressure circulation valve having an upper joint 1, an outer cylinder 3 and a lower joint 7 connected in this order, wherein the upper joint 1 and the outer cylinder 3 are screwed together (at a position a in the drawing), and the lower joint 7 and the outer cylinder 3 are also screwed together (at a position b in the drawing).

As shown in fig. 3, the upper joint 1 is provided with circulation holes 101 (preferably four circulation holes) along the circumferential space, which are channels for circulating the liquid inside and outside the pipe column, and internal threads (not shown in the drawing) are arranged in the circulation holes for assembling the plug, so that the sealing performance of the sealing element (including the supporting seal 12 and the O-ring 17) in the position c can be tested. The upper joint 1 is internally connected with the circulating mandrel 2 for plugging the circulating hole 101, specifically, a connecting shear pin 8 is arranged between the bottom side of the upper joint 1 and the circulating mandrel 2, so that the upper joint 1 and the circulating mandrel 2 are connected and positioned, on one hand, the initial position of the circulating mandrel 2 is limited, the circulating hole 101 is in a closed state, on the other hand, the underground pressure is balanced and excited, and the circulating mandrel 2 is prevented from accidentally opening the circulating hole 101. The pressure condition under the well can be estimated in advance during operation, and a proper number of connecting shear pins are arranged to balance and offset the pressure change.

In the state that the circulation hole 101 is required to be communicated with the inner diameter of the upper joint 1, as shown in fig. 4, a pressurizing cavity 102 for driving the connecting shear pin 8 to break is formed between the circulation mandrel 2 and the outer cylinder 3 as well as the bottom end surface of the upper joint 1, after the rupture disc breaks, the pressurizing cavity 102 is applied with pressure to the bottom end surface of the upper joint 1, the upper joint 1 is driven to move upwards (the circulation mandrel 2 moves downwards) relative to the circulation mandrel 2, so that the connecting shear pin 8 is driven to break, the circulation mandrel 2 moves downwards, the circulation hole 101 is communicated with the inner diameter of the upper joint 1, and the replacement fluid circulation inside and outside the valve body can be realized.

For the pressurization operation in the pressurizing chamber 102, a driving mechanism for driving the upper joint 1 and the circulating mandrel 2 to move relatively and penetrating the circulating hole 101 is provided on the circulating mandrel 2, and the specific structure is shown in fig. 4, and the device comprises a rupture disc seat 4 (preferably a threaded connection structure) detachably assembled on the circulating mandrel 2 from the outer wall of the circulating mandrel 2 to the inner wall direction, wherein the rupture disc seat 4 is of a cylindrical structure, a stepped hole 4a is provided on one side of the rupture disc seat near the inner wall of the circulating mandrel 2, and a rupture disc 10 (preferably a threaded connection structure) is detachably assembled in the stepped hole 4 a. The assembly operation is as follows: firstly, the rupture disc 10 is assembled into the stepped hole 4a of the rupture disc seating 4, and then the rupture disc seating 4 is assembled on the circulating mandrel 2, so that the operation mode of assembling the rupture disc from the outer wall of the circulating mandrel 2 is realized, the defect that the assembly of the rupture disc 10 is difficult due to the small aperture in the circulating mandrel 2 is overcome (because the rupture disc 10 has a rupture direction, the rupture disc is usually convenient to be assembled smoothly on the outer wall of the circulating mandrel 10, and the rupture direction of the rupture disc is applied from the outer side of the circulating mandrel 2, so that the rupture disc is ruptured inwards, and the operation needs to be pressed and hit the rupture disc through the diameter), and therefore, the utility model can solve the limitation of assembling the rupture disc from the inner diameter of the circulating mandrel 2 by arranging the rupture disc seating 4, and simultaneously can conveniently apply the pressure for rupture of the rupture disc from the inner diameter of the circulating mandrel 2, and reduce the manufacturing cost and the assembling difficulty of a valve body.

The driving function of the driving mechanism is as follows: the pressure is applied to the rupture disc from the inner diameter of the circulating mandrel 2, so that the rupture disc is ruptured, the pressure enters the pressurizing cavity 102 and acts on the bottom end surface of the upper joint 1, the connecting shear pin 8 is further caused to be ruptured, the circulating mandrel 2 moves downwards, the circulating hole 101 is communicated with the inner diameter of the upper joint 1, and the replacement fluid circulation inside and outside the valve body can be realized.

In order to realize the downward movement limit of the circulating mandrel 2 in the pressurized state, as shown in fig. 4, a mandrel step surface 2a and an outer cylinder step surface 3a corresponding to each other are respectively arranged in the middle of the outer wall of the circulating mandrel 2 and the inner wall of the outer cylinder 3, and the downward movement limit of the circulating mandrel 2 is realized through the contact between the mandrel step surface 2a and the outer cylinder step surface 3a in the process of pressurizing and driving the circulating mandrel 2 to move downward.

Because after the rupture disc 10 breaks and the connecting shear pin 8 breaks, the circulating mandrel 2 is driven to move downwards at a higher moving speed by a larger pressure test, and a strong impact force is generated between the circulating mandrel 2 and the inner hole of the outer cylinder 3, in order to avoid the impact between the circulating mandrel 2 and the outer cylinder 3, as shown in fig. 4, a buffer ring 5 connected with the step surface 3a of the outer cylinder is sleeved on the circulating mandrel 2, after the circulating mandrel 2 moves downwards, the step surface 2a of the mandrel is contacted with the buffer ring 5 to effectively buffer the downward movement of the circulating mandrel 2, so that a certain vibration filtering effect can be achieved, and the impact on the end surface of the circulating mandrel 2 due to the impact to generate burrs, scratch the sealing surface of the air chamber and the impact on the stability of a valve body and a tool string in a well can be avoided.

The mandrel step surface 2a and the outer cylinder step surface 3a are formed with an air chamber 103, and the circulating mandrel 2 is rebounded by the piston effect in the air chamber 103 to re-close the circulating hole 101 in the descending process, so in order to solve the problem, as shown in fig. 5, a pressure relief sealing member (also including a supporting seal 12 and an O-ring 17, and positioned as shown in d in the figure) is circumferentially arranged on the circulating mandrel 2 at the bottom side of the outer cylinder step surface 3a, and a pressure relief groove 3b corresponding to the pressure relief sealing member is formed in the inner wall at the bottom side of the outer cylinder 3. In the mandrel downward moving process, the pressure release sealing piece can be embedded into the pressure release groove 3b, so that the sealing at the position is invalid, the pressure in the air chamber 103 is released, the pressure balance of the air chamber 103 and the upper end and the drift diameter of the air chamber is realized, and the problem that the circulating mandrel 2 moves upwards to close the circulating hole 101 is avoided.

In theory, the circulating mandrel 2 keeps static under the action of gravity, but because the circulating mandrel 2 still has the possibility of ascending to close the circulating hole again due to the continuous flowing of the liquid in the well, in order to avoid the risk, a locking structure which is positioned relatively to the upper joint 1 and is arranged at the bottom side of the circulating mandrel 2 under the penetrating state of the circulating hole 101 is specifically structured as shown in fig. 5, the locking structure comprises a locking block 6 which is clamped between the outer cylinder 3 and the lower joint 7 at a circumferential interval, an annular locking groove 2b which is arranged on the circulating mandrel 2 close to the pressure relief sealing piece, and an annular tension spring 9 which drives the annular tension spring 9 to be embedded into the annular locking groove 2b is sleeved on the peripheral surface of the locking block 6 (the back side of each locking block 6 is of a U-shaped groove structure and can be embedded into the annular tension spring 9 in a limited way), after the circulating mandrel 2 moves downwards, the locking blocks 6 are driven to be embedded into the mandrel in the annular locking groove 2b under the action of the annular tension spring 9, so that the locking effect of the circulating mandrel 2 is realized, and the problem that the circulating mandrel 2 moves upwards again due to the pressure of the liquid in the well is avoided.

The principle of the utility model is as follows: by pressurizing the valve body, the hydraulic pressure breaks the rupture disc 10 and converges into the pressurizing cavity 102, acts on the bottom end surface of the upper joint 1, further promotes the connection shear pin 8 to break, and the circulating mandrel 2 moves downwards, the pressure release sealing piece can be embedded into the pressure release groove 3b, so that the sealing at the position is invalid, the pressure in the air chamber 103 is released, the pressure balance of the pressure of the air chamber 103 and the upper end and the drift diameter of the air chamber is realized, and the problem that the circulating hole 101 is closed by the upward movement of the circulating mandrel 2 is avoided; meanwhile, after the annular locking groove 2b corresponds to the locking blocks 6, the plurality of locking blocks 6 drive the locking blocks 6 to be embedded into the annular locking groove 2b under the action of the annular tension springs 9, so that the locking effect of the circulating mandrel 2 is realized, and the problem that the circulating mandrel 2 moves upwards again to block the circulating hole 101 due to underground liquid pressure is avoided. After the circulating mandrel 2 is locked, the circulating hole 101 is communicated with the inner diameter of the upper joint 1, so that the replacement fluid circulation inside and outside the valve body can be realized.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. The present utility model is subject to various changes and modifications without departing from the spirit and scope thereof, and such changes and modifications fall within the scope of the utility model as hereinafter claimed.

Claims

1. The utility model provides a pressurization circulation valve in RD-W, the circulation valve has upper joint (1), urceolus (3) and lower joint (7) that connect gradually, its characterized in that: the upper joint (1) is provided with circulating holes (101) along the circumferential spacing, the upper joint (1) is internally connected with a circulating mandrel (2) for sealing the circulating holes (101), the circulating mandrel (2) is provided with a driving mechanism for driving the upper joint (1) and the circulating mandrel (2) to move relatively and enabling the circulating holes (101) to penetrate, and the bottom side of the circulating mandrel (2) is provided with a locking structure for positioning the circulating mandrel (2) and the upper joint (1) relatively in a circulating hole (101) penetrating state.

2. The internal pressurized circulation valve of claim 1, wherein: the connecting shear pin (8) is arranged between the bottom side of the upper connector (1) and the circulating mandrel (2), a pressurizing cavity (102) for driving the connecting shear pin (8) to break is formed between the circulating mandrel (2) and the outer cylinder (3) as well as between the circulating mandrel and the bottom end surface of the upper connector (1), and the driving mechanism is arranged on the circulating mandrel (2) and communicated with the pressurizing cavity (102).

3. The internal pressurized circulation valve of claim 2, wherein: the driving mechanism comprises a rupture disc seat (4) detachably assembled on the circulating mandrel (2) from the outer wall of the circulating mandrel (2) towards the inner wall, the rupture disc seat (4) is of a cylindrical structure, a stepped hole (4 a) is formed in one side, close to the inner wall of the circulating mandrel (2), of the rupture disc seat, and a rupture disc (10) is detachably assembled in the stepped hole (4 a).

4. An internal pressurized circulation valve according to claim 3, wherein: the middle part of the outer wall of the circulating mandrel (2) and the inner wall of the outer cylinder (3) are respectively provided with a mandrel step surface (2 a) and an outer cylinder step surface (3 a) which correspond to each other, the mandrel step surface (2 a) and the outer cylinder step surface (3 a) form an air chamber (103), and a buffer ring (5) connected with the outer cylinder step surface (3 a) is sleeved on the circulating mandrel (2) in a ring mode.

5. The internal pressurized circulation valve of claim 4, wherein: the annular pressure relief sealing piece is arranged on the circulating mandrel (2) at the bottom side of the outer barrel step surface (3 a), and a pressure relief groove (3 b) which can correspond to the pressure relief sealing piece is formed in the inner wall of the bottom side of the outer barrel (3).

6. The internal pressurized circulation valve of claim 5, wherein: the locking structure comprises a locking block (6) clamped between the outer cylinder (3) and the lower joint (7) at a circumferential distance, an annular locking groove (2 b) formed in the circulating mandrel (2) close to the pressure release sealing piece, and an annular tension spring (9) for driving the locking block (6) to be embedded into the annular locking groove (2 b) is sleeved on the outer circumferential surface of the locking block.