A downhole reversing device for integrated injection-production process

Abstract

The utility model discloses an underground reversing device for injection-production integrated process, including the device body, the device body one side is steam injection channel, and the steam injection channel injects the high temperature steam generated by steam injection equipment into the formation through the oil pipe and heats the heavy oil, and the device body other side is production channel, and the steam injection channel and production channel are communicated through the liquid passage, and the ball seat sealing mechanism is equipped in the liquid passage, and the ball seat sealing mechanism is connected drive mechanism through the connecting rod steering mechanism, and drive mechanism drives connecting rod steering mechanism and drives the ball seat sealing mechanism to rotate, realizes the opening and the close of production channel. The utility model has the function of reversing, and when producing, the oil production channel is communicated, and the formation liquid can be lifted to the ground through the channel, when injecting heat, the oil production channel is closed, and the injected steam can be injected into the well bottom through the steam channel, realizes the switching of injection channel and oil production channel, and a trip of pipe column can complete the injection heat, production operation, improves the working time efficiency on the spot, and saves the production cost.

Description

Technical Field

[0001] This utility model belongs to the field of downhole tool technology, and in particular relates to a downhole reversing device for integrated injection and production processes. Background Technology

[0002] Currently, integrated injection and production technology has been widely applied in offshore heavy oil extraction. However, most integrated injection and production technologies still use two sets of tubing for injection and production. That is, one set of tubing is used for steam injection, and another set is used for oil production. Especially during multiple rounds of steam huff and puff operations, this seriously occupies the well workover rig operation time, consuming a lot of manpower and resources, which is time-consuming and labor-intensive.

[0003] Therefore, this invention proposes a downhole reversing device for integrated injection and production processes. Utility Model Content

[0004] The problem this utility model aims to solve is to provide a downhole reversing device for integrated injection and production processes. This device has a reversing function, realizing the switching between the injection channel and the production channel. The injection and production operations can be completed in one trip of the tubing string, improving the efficiency of on-site work and saving production costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a downhole reversing device for integrated injection and production process, comprising a device body, one side of which is a steam injection channel, through which high-temperature steam generated by the steam injection equipment is injected into the formation to heat heavy oil via an oil pipe, and the other side of which is a production channel, the steam injection channel and the production channel being connected by a liquid passage, the liquid passage being provided with a ball seat sealing mechanism, the ball seat sealing mechanism being connected to a drive mechanism via a connecting rod steering mechanism, a sealing mechanism being provided between the drive mechanism and the connecting rod steering mechanism, the drive mechanism driving the connecting rod steering mechanism to rotate the ball seat sealing mechanism, thereby realizing the opening and closing of the production channel.

[0006] Furthermore, an oil inlet hose is provided above the production channel, the oil inlet hose is connected to a valve seat, and the valve seat is connected to the drive mechanism.

[0007] Furthermore, the drive mechanism includes an upper connector, the lower end of which is threaded to the valve seat. A spring support block is provided inside the lower part of the upper connector. One end of the piston rod passes through the spring support block and is threaded to one end of the spring spindle. An actuating spring is sleeved on the outer cylindrical surface of the spring spindle. A straightening sleeve is sleeved on the upper end of the spring spindle. A positioning cap is threaded to the spring spindle and presses against the straightening sleeve. The actuating spring is placed between the straightening sleeve and the spring support block.

[0008] Furthermore, the top of the upper connector is provided with an NPT thread, which is connected to the ground pressure testing equipment through a hydraulic control line, allowing hydraulic oil to enter the interior of the upper connector.

[0009] Furthermore, the sealing mechanism includes a sealing cavity, the lower part of which is threadedly connected to the valve seat, the top of which has a groove, the spring support block being placed in the groove, and a circular hole channel within which the piston rod passes. The gasket, metal C-ring, and C-ring spacer pass sequentially through the piston rod, and the piston rod and the sealing cavity are press-fitted together to achieve a seal.

[0010] Furthermore, the connecting rod steering mechanism includes a lower plate with a groove on its upper part. A protrusion at the lower part of the piston rod is inserted into the groove, and a circular groove passes through the lower plate. The connecting rod rotates within the circular groove. The connecting rod is connected to a long connecting rod by a bolt, and the connecting rod and the long connecting rod rotate around the bolt. The long connecting rod is connected to a short connecting rod by a shoulder bolt, and the long connecting rod and the short connecting rod rotate around the shoulder bolt. The lower end of the short connecting rod has a square hole through which a square shaft on the control rod passes. The ball valve has a long groove that engages with the control rod. When the short connecting rod rotates, the control rod rotates, causing the ball valve to rotate.

[0011] Furthermore, it also includes a sealing nut and a positioning nut, both of which are connected to the body for easy assembly.

[0012] Furthermore, the linkage steering mechanism comprises two sets, which are arranged symmetrically.

[0013] Furthermore, the ball seat sealing mechanism includes a sealing seat, a lower oil pipe buckle is provided below the production channel, the lower oil pipe buckle is connected to the sealing seat, the upper part of the sealing seat is provided with an arc-shaped groove, the arc-shaped groove cooperates with the ball valve, the upper end of the ball valve contacts the support ring, the upper end of the support ring is provided with a support spring, the support spring is located in the groove on the right side of the body, when the threaded thread of the sealing seat is locked, the support spring is in a compressed state, the elastic force causes the support ring to press against the ball valve, the ball valve is pressed into the arc-shaped groove, and a sealing effect is achieved.

[0014] Furthermore, the ball valve has a liquid passage inside, which is arranged at right angles.

[0015] The advantages and positive effects of this utility model are: This utility model has a switching function. During production, the oil production channel is connected, and the formation fluid can be lifted to the surface through the channel. During heating, the oil production channel is closed, and the injected steam can be injected into the bottom of the well through the steam channel, realizing the switching between the heating channel and the oil production channel. One trip of tubing can complete the heating and production operations, improve the efficiency of on-site work, and save production costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the production channel in the closed state according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the production channel in the open state according to an embodiment of this utility model.

[0019] In the picture: 1. Device body; 2. Ball valve; 3. Sealing seat; 4. Control lever; 5. Support ring; 6. Short connecting rod; 7. Long connecting rod; 8. Connecting rod; 9. Support spring; 10. Locating nut; 11. Shoulder bolt; 12. Bolt; 13. Sealing nut; 14. Valve seat; 15. Sealing cavity; 16. Gasket; 17. Metal C-ring; 18. C-ring spacer; 19. Fixed sleeve; 20. Piston rod; 21. Upper connector; 22. Spring support block; 23. Spring spindle; 24. Centering sleeve; 25. Positioning cap; 26. Actuating spring; 27. Lower plate. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The embodiments of this utility model will be further described below with reference to the accompanying drawings: like Figure 1 As shown, a downhole reversing device for integrated injection and production processes includes a device body 1. One side of the device body 1 is a steam injection channel, through which high-temperature steam generated by the steam injection equipment is injected into the formation to heat heavy oil via tubing. Preferably, the left steam injection channel has tubing connections at both the upper and lower ends. The upper tubing connection is connected to the steam injection pipeline via a connecting tubing to the surface, and the lower tubing connection is connected to the formation via a tubing, allowing steam to be injected into the formation through the steam injection channel. The other side of the device body 1 is a production channel. The steam injection channel and the production channel are connected via a liquid passage. A ball seat sealing mechanism is installed in the liquid passage. The ball seat sealing mechanism is connected to a drive mechanism via a connecting rod steering mechanism. A sealing mechanism is installed between the drive mechanism and the connecting rod steering mechanism. The drive mechanism drives the connecting rod steering mechanism to rotate the ball seat sealing mechanism, thereby opening and closing the production channel.

[0024] Preferably, an upper oil pipe buckle is provided above the production channel, the upper oil pipe buckle is connected to the valve seat 14, the valve seat 14 is connected to the drive mechanism, and the lower oil pipe buckle is connected to the sealing seat 3.

[0025] The drive mechanism is a device that provides power to the linkage steering mechanism. The drive mechanism can have various structures, as long as it achieves the aforementioned functions. Specifically, the drive mechanism provided in this embodiment includes an upper connector 21. The lower end of the upper connector 21 is threadedly connected to a valve seat 14. The top of the upper connector 21 has an NPT thread, which is connected to a ground pressure testing device via a hydraulic control line. The ground pressure testing device allows hydraulic oil to enter the upper connector 21. A spring support block 22 is located at the lower part of the upper connector 21. One end of the piston rod 20 passes through the spring support block 22 and is threadedly connected to one end of a spring spindle 23. An actuation spring 26 is sleeved on the outer cylindrical surface of the spring spindle 23. A straightening sleeve 24 is sleeved on the upper end of the spring spindle 23. The straightening sleeve 24 is transitionally connected to the spring spindle 23. A positioning cap 25 is threadedly connected to the spring spindle 23 and presses against the straightening sleeve 24. The actuation spring 26 is positioned between the straightening sleeve 24 and the spring support block 22.

[0026] The sealing mechanism is a device to ensure no leakage under high temperature and high pressure. The sealing mechanism can have various structures, as long as it achieves the aforementioned functions. Specifically, the sealing mechanism provided in this embodiment includes a sealing cavity 15. The lower part of the sealing cavity 15 is threadedly connected to the valve seat 14. The top of the sealing cavity 15 has a groove, and the spring support block 22 is placed in the groove for positioning. A circular hole channel is provided inside the sealing cavity 15, through which the piston rod 20 passes for guiding. The gasket 16, upper metal C-ring 17, C-ring spacer 18, and lower metal C-ring 17 sequentially pass through the piston rod 20, and the piston rod 20 and the sealing cavity 15 are press-fitted to achieve a seal. The fixing sleeve 19 is threadedly connected to the sealing cavity 15 to prevent the C-ring from slipping off.

[0027] The linkage steering mechanism is a device that drives the ball valve 2 to rotate. The linkage steering mechanism can have various structures, as long as it achieves the above-mentioned function. Specifically, the linkage steering mechanism provided in this embodiment includes a lower plate 27. The upper part of the lower plate 27 has a lower plate groove. The protrusion at the lower part of the piston rod 20 is inserted into the lower plate groove. A circular groove passes through the lower plate 27, and the connecting rod 8 rotates within the circular groove. The connecting rod 8 is connected to a long connecting rod 7 via a bolt 12. The connecting rod 8 and the long connecting rod 7 rotate around the bolt 12. The long connecting rod 7 is connected to a short connecting rod 6 via a shoulder bolt 11. The long connecting rod 7 and the short connecting rod 6 rotate around the shoulder bolt 11. The lower end of the short connecting rod 6 has a square hole through which a square shaft on the control rod 4 passes. The ball valve 2 has a long groove that engages with the control rod 4. When the short connecting rod 6 rotates, the control rod 4 rotates, driving the ball valve 2 to rotate.

[0028] Preferably, it also includes a sealing nut 13 and a positioning nut 10, both of which are connected to the body for easy assembly. The linkage steering mechanism provided in this embodiment includes two sets, one set on each side, arranged symmetrically. This allows the left and right linkage steering mechanisms to operate simultaneously, driving the ball valve 2 to rotate.

[0029] The ball seat sealing mechanism is a device for opening and closing the production channel. The ball seat sealing mechanism can have various structures, as long as it achieves the aforementioned function. Specifically, the ball seat sealing mechanism provided in this embodiment includes a sealing seat 3. A lower oil pipe buckle is provided below the production channel, connecting the sealing seat 3. The upper part of the sealing seat 3 has an arc-shaped groove that mates with the ball valve 2. The upper end of the ball valve 2 contacts a support ring 5. A support spring 9 is provided at the upper end of the support ring 5, located in a groove on the right side of the body. When the threaded connection of the sealing seat 3 is tightened, the support spring 9 is compressed, and the elastic force causes the support ring 5 to press against the ball valve 2, pressing the ball valve 2 into the arc-shaped groove, thus achieving a sealing effect. Preferably, the ball valve 2 has a liquid passage inside, which is arranged at a right angle.

[0030] The working principle of this utility model is as follows: The initial state of the reversing device is with the production channel closed. The oil pipe is connected to the steam injection channel of the device body 1 and lowered into the corresponding position in the formation. The oil pipe connected to the surface is connected to the steam injection equipment. The steam injection equipment is started, and steam is injected into the formation along the oil pipe through the steam injection channel of the device body 1.

[0031] After steam injection is completed, the hydraulic oil is pressurized by ground pressurization equipment and enters the upper connector 21 through the hydraulic control line connected to the upper connector 21. Due to the sealing effect of the sealing mechanism, the internal pressure increases.

[0032] Under pressure, the spring spindle 23, piston rod 20, and lower plate 27 are pushed downwards, compressing the actuator spring 26. During the downward movement of the lower plate 27, the long connecting rod 7, short connecting rod 6, and control rod 4 are driven to rotate, and torque is applied to the ball valve 2. However, under the action of the support spring 9, the ball valve 2 remains in contact and sealed with the valve seat 14 and sealing seat 3.

[0033] Under the action of this torque, ball valve 2 rotates 90°. Since ball valve 2 has a right-angle channel inside, the production channel and the steam injection channel are connected. The ground maintains this pressure to keep the production channel and the steam injection channel connected.

[0034] A lifting device is connected to the lower part of the production channel. When the lifting device is activated, the formation fluid is lifted to the ground through the production channel.

[0035] When the next round of steam injection is carried out, the ground pressure equipment is depressurized, and the spring spindle 23, piston rod 20, lower plate 27 and other components move upward under the action of spring force. Through the connecting rod steering mechanism, the ball valve 2 is rotated, the production channel is closed, the reversing valve returns to its initial state, and the next round of heat injection is carried out.

[0036] The advantages and positive effects of this utility model are: This utility model has a switching function. During production, the oil production channel is connected, and the formation fluid can be lifted to the surface through the channel. During heating, the oil production channel is closed, and the injected steam can be injected into the bottom of the well through the steam channel, realizing the switching between the heating channel and the oil production channel. One trip of tubing can complete the heating and production operations, improve the efficiency of on-site work, and save production costs.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A downhole reversing device for integrated injection-production process, characterized in that: The device includes a main body, one side of which is a steam injection channel. The steam injection channel injects high-temperature steam generated by the steam injection equipment into the formation through an oil pipe to heat the heavy oil. The other side of the main body is a production channel. The steam injection channel and the production channel are connected through a liquid passage. A ball seat sealing mechanism is provided in the liquid passage. The ball seat sealing mechanism is connected to a drive mechanism through a connecting rod steering mechanism. A sealing mechanism is provided between the drive mechanism and the connecting rod steering mechanism. The drive mechanism drives the connecting rod steering mechanism to rotate the ball seat sealing mechanism, thereby opening and closing the production channel.

2. The downhole reversing device for integrated injection and production process according to claim 1, characterized in that: An oil inlet hose is provided above the production channel. The oil inlet hose is connected to a valve seat, and the valve seat is connected to the drive mechanism.

3. A downhole reversing device for integrated injection and production process according to claim 2, characterized in that: The drive mechanism includes an upper connector, the lower end of which is threaded to the valve seat. A spring support block is provided inside the lower part of the upper connector. One end of the piston rod passes through the spring support block and is threaded to one end of the spring spindle. An actuating spring is sleeved on the outer cylindrical surface of the spring spindle. A straightening sleeve is sleeved on the upper end of the spring spindle. A positioning cap is threaded to the spring spindle and presses against the straightening sleeve. The actuating spring is placed between the straightening sleeve and the spring support block.

4. A downhole reversing device for integrated injection and production process according to claim 3, characterized in that: The top of the upper connector is provided with an NPT thread, which is connected to the ground pressure testing equipment through a hydraulic control line, allowing hydraulic oil to enter the interior of the upper connector.

5. A downhole reversing device for integrated injection and production process according to claim 3 or 4, characterized in that: The sealing mechanism includes a sealing cavity, the lower part of which is threadedly connected to the valve seat. The top of the sealing cavity has a groove, and the spring support block is placed in the groove. The sealing cavity has a circular hole channel, through which the piston rod passes. A gasket, a metal C-ring, and a C-ring spacer pass through the piston rod in sequence. The piston rod and the sealing cavity are press-fitted to achieve a seal.

6. A downhole reversing device for integrated injection and production process according to claim 3 or 4, characterized in that: The connecting rod steering mechanism includes a lower plate with a groove on its upper part. A protrusion at the lower part of the piston rod is inserted into the groove. A circular groove passes through the lower plate, and the connecting rod rotates within the circular groove. The connecting rod is connected to a long connecting rod by a bolt, and the connecting rod and the long connecting rod rotate around the bolt. The long connecting rod is connected to a short connecting rod by a shoulder bolt, and the long connecting rod and the short connecting rod rotate around the shoulder bolt. The lower end of the short connecting rod has a square hole through which a square shaft on the control rod passes. The ball valve has a long groove that engages with the control rod. When the short connecting rod rotates, the control rod rotates, causing the ball valve to rotate.

7. A downhole reversing device for integrated injection and production process according to claim 6, characterized in that: It also includes a sealing nut and a positioning nut, both of which are connected to the body for easy assembly.

8. A downhole reversing device for integrated injection and production process according to claim 6, characterized in that: The linkage steering mechanism includes two sets, which are arranged symmetrically.

9. A downhole reversing device for integrated injection-production process according to any one of claims 1 to 4, characterized in that: The ball seat sealing mechanism includes a sealing seat, a lower oil pipe buckle is provided below the production channel, the lower oil pipe buckle is connected to the sealing seat, the upper part of the sealing seat is provided with an arc-shaped groove, the arc-shaped groove cooperates with the ball valve, the upper end of the ball valve contacts the support ring, the upper end of the support ring is provided with a support spring, the support spring is located in the groove on the right side of the body, when the threaded thread of the sealing seat is locked, the support spring is in a compressed state, the elastic force causes the support ring to press against the ball valve, the ball valve is pressed into the arc-shaped groove, and a sealing effect is achieved.

10. A downhole reversing device for integrated injection and production process according to claim 9, characterized in that: The ball valve has a liquid passage inside, which is arranged at right angles.

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