A large-diameter downhole cable-controlled annular packer

Abstract

The application provides a large-diameter downhole cable control annular packer, which comprises a transmission mechanism and a center pipe, the transmission mechanism is installed on the surface of the center pipe, the transmission mechanism comprises an output shaft, a double gear, an eccentric transmission sleeve, a second internal gear and a motor, the output shaft is coaxially arranged with the center pipe and is installed in the motor, the eccentric transmission sleeve is coaxially arranged with the center pipe and is in key connection with the output shaft, and the output shaft is used for driving the eccentric transmission sleeve to rotate. The transmission structure is used, so that the motor can intelligently drive the rubber cylinder to realize setting and unsetting through the multi-stage transmission structure when working, and the use is more efficient; the large-diameter downhole cable control annular packer only needs a well logging cable to realize transmission of measurement and control signals and power supply of the packer, greatly prolongs the service life of the packer and reduces the complexity of the system.

Description

Technical Field

[0001] This invention belongs to the field of oil production engineering equipment technology, and specifically relates to a large-diameter downhole cable-controlled annular packer. Background Technology

[0002] Packers, a common downhole tool in oil and gas fields, are elastic sealing components that seal the annulus, isolating the producing formation and protecting the casing. They are primarily used in drilling, well testing, stratified oil / water production, water shut-off, and enhanced production operations. Currently, the setting / unsetting of downhole packers used domestically and internationally mainly relies on mechanical force and water pressure differential. The lifting and lowering process often requires the use of workover trucks, pump trucks, and other well operation equipment. These packers have complex overall structures and operating processes, resulting in high labor intensity, high operating costs, limited sealing thickness, low reliability, and susceptibility to failure. The main causes of packer failure include mid-set, automatic unsetting after setting, cross-sealing, and seal failure. Adopting intelligent electronically controlled active setting and unsetting methods, along with appropriate parameter selection, can avoid most of these problems. Summary of the Invention

[0003] To address the above problems, this invention proposes a large-diameter downhole cable-controlled annular packer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A large-diameter downhole cable-controlled annular packer includes a transmission mechanism and a central tube;

[0006] The transmission mechanism is mounted on the surface of the central tube;

[0007] The transmission mechanism includes an output shaft, a double gear, an eccentric transmission sleeve, a second internal gear, and a motor;

[0008] The output shaft is installed inside the motor and is coaxially arranged with the central tube;

[0009] The eccentric transmission sleeve is keyed to the output shaft and is coaxially arranged with the central tube. The output shaft is used to drive the eccentric transmission sleeve to rotate.

[0010] A transmission gear is fixedly connected to the surface of the eccentric transmission sleeve. The transmission gear is eccentrically set with the central tube, and the outer surface of the transmission gear meshes with the inner surface of the double gear. The eccentric transmission sleeve drives the double gear to rotate through the transmission gear.

[0011] The upper gear of the double gear meshes with the second internal gear, and the second internal gear meshes with a lead screw;

[0012] The second internal gear and the lead screw are both coaxially arranged with the central tube.

[0013] Preferably, a cylinder liner assembly is provided outside the transmission mechanism, the cylinder liner assembly including a first cylinder liner, a first connecting sleeve, a second cylinder liner, a second connecting sleeve, a third cylinder liner, and a fourth cylinder liner;

[0014] The first connecting sleeve is annular, and the two ends of the annular surface overlap with the first cylinder liner and the second cylinder liner, respectively.

[0015] The second connecting sleeve is annular, with its two ends overlapping the second cylinder liner and the third cylinder liner, respectively.

[0016] The end of the third cylinder liner furthest from the second cylinder liner overlaps with the fourth cylinder liner.

[0017] Preferably, a first bearing is installed on the inner wall of the first connecting sleeve;

[0018] A second bearing is installed on the inner wall of the second connecting sleeve;

[0019] The inner rings of both the first and second bearings are coaxially mounted on the surface of the output shaft.

[0020] Preferably, the inner wall of the third cylinder liner is keyed with a first internal gear, which meshes with the lower gear of the double gear.

[0021] Preferably, the lead screw includes a gear end and a lead screw end;

[0022] The gear end meshes with the second internal gear;

[0023] The lead screw end is threaded with a nut.

[0024] Preferably, it also includes a rubber sleeve shaft, which is coaxially arranged with the central tube;

[0025] The rubber sleeve shaft has a stepped cylindrical structure, with one end fixedly sleeved on the surface of the nut, and the nut is blocked axially by a shoulder.

[0026] Preferably, one end of the rubber sleeve shaft is located inside the fourth cylinder liner, and the other end extends to the outside of the fourth cylinder liner;

[0027] The outer surface of the rubber sleeve shaft is coaxially provided with a lower pressure ring, a rubber sleeve and an upper pressure ring in sequence;

[0028] The lower pressure ring abuts against the fourth cylinder liner and is fixedly connected to the rubber sleeve shaft;

[0029] The rubber tube abuts against the lower pressure ring and is slidably connected to the rubber tube shaft;

[0030] The upper pressure ring abuts against the lower pressure ring and is slidably connected to the rubber sleeve shaft.

[0031] Preferably, the anti-rotation sleeve key on the inner wall of the rubber sleeve shaft is connected to a fourth mounting key, one end of which is embedded in the anti-rotation sleeve and the other end is slidably connected to the rubber sleeve shaft.

[0032] Preferably, it further includes an upper pressure testing mechanism, which includes an upper connector and an upper short-circuit;

[0033] The upper connector overlaps with the upper pressure ring and is fixedly sleeved on the upper short connector;

[0034] The upper short-circuit is fixedly sleeved on the central tube;

[0035] The upper short-circuit end face facing the anti-rotation sleeve is equipped with a second pressure sensor and a third pressure sensor.

[0036] Preferably, the large-diameter downhole cable-controlled annular packer further includes a lower pressure testing mechanism, which includes a lower short connector, a sealing insert, and a first nut;

[0037] The lower short-circuit is fixedly sleeved on the sealing insert and overlaps with the first cylinder liner;

[0038] The first nut is connected to the lower short thread and abuts against the first cylinder liner;

[0039] The sealed insertion tube is fixedly connected to the central tube;

[0040] A first pressure sensor is installed on the end face of the lower short circuit facing the central tube.

[0041] Preferably, both the lower and upper shorting ends are provided with through holes, and a sealing assembly is installed in the through holes, with a threaded sleeve embedded in the inner wall.

[0042] Preferably, a circuit board is also mounted on the surface of the sealing cannula;

[0043] The circuit board is connected to wires, which are respectively connected to the first pressure sensor, the second pressure sensor, the third pressure sensor, the sealing assembly, and the motor.

[0044] Preferably, a second mounting key is installed between the eccentric transmission sleeve and the output shaft, and a third nut is provided on the outside of the second mounting key, the third nut being fixedly connected to the eccentric transmission sleeve.

[0045] Preferably, the rotor of the motor is connected to the output shaft by a first mounting key, and a second nut is provided on the outside of the first mounting key to block the first mounting key. The second nut is fixedly connected to the output shaft.

[0046] Preferably, a third mounting key is installed between the third cylinder liner and the first internal gear, with one end of the third mounting key fixedly connected to the third cylinder liner and the other end embedded in the outer surface of the first internal gear.

[0047] The beneficial effects of this invention are:

[0048] 1. By using a transmission structure, the present invention enables the motor to intelligently drive the rubber cylinder to achieve sealing and unsealing through a multi-stage transmission structure during operation, making it more efficient.

[0049] 2. The large-diameter downhole cable-controlled annular packer of the present invention only requires logging cables to realize the transmission of measurement and control signals and the power supply of the packer, which greatly increases the working life of the packer and reduces the complexity of the system.

[0050] 3. Compared with mechanically controlled and hydraulically controlled packers, the large-diameter downhole cable-controlled annular packer of the present invention has the characteristics of simple structure, precise and convenient control, fast response, high efficiency, and high integration, and the field construction difficulty is small.

[0051] 4. The large-diameter downhole cable-controlled annular packer of the present invention is equipped with three pressure sensors, which can simultaneously monitor the pressure of the upper part, lower part and central channel of the rubber sleeve. The pressure sensors at the upper and lower parts of the rubber sleeve enable the intelligent packer to have self-test sealing capability.

[0052] 5. The large-diameter downhole cable-controlled annular packer of the present invention is designed to complete the unsealing process through mechanical unsealing in the event of electric unsealing failure. This solves the problem of unsealing due to failure of electric unsealing components or circuit failure, thereby avoiding accidents caused by the intelligent packer getting stuck in the well, improving the safety of operations, and further improving the efficiency of oil well operations.

[0053] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 A schematic diagram of the structure of a large-diameter downhole cable-controlled annular packer according to the present invention is shown;

[0056] Figure 2 A schematic diagram of the transmission mechanism of the present invention is shown;

[0057] Figure 3 A schematic diagram of the transmission of the double gear of the present invention is shown;

[0058] Figure 4 A schematic diagram of the upper pressure measuring mechanism of the present invention is shown;

[0059] Figure 5 A schematic diagram of the lower pressure measuring mechanism of the present invention is shown.

[0060] In the diagram: 1. Lower short connector; 2. Sealing tube; 3. First nut; 4. First sealing ring; 5. First pressure sensor; 6. First cylinder liner; 7. Circuit board; 8. Wire; 9. First bearing; 10. First connecting sleeve; 11. Second nut; 12. First mounting key; 13. Output shaft; 14. Second bearing; 15. Second cylinder liner; 16. Second connecting sleeve; 17. Third nut; 18. Second mounting key; 19. Transmission gear; 20. Double gear; 21. Eccentric transmission sleeve; 22. Third cylinder liner; 23. Third mounting key; 24. First internal gear; 25. Positioning sleeve; 26. 27. Third bearing; 28. Bearing sleeve; 29. ​​Spacer sleeve; 30. Second internal gear; 31. Receiver seat; 32. Fourth bearing; 33. Fourth cylinder liner; 34. Nut; 35. Lead screw; 36. Gear end; 37. Lead screw end; 38. Rubber sleeve shaft; 39. Lower pressure ring; 40. Rubber sleeve; 41. Upper pressure ring; 42. Fourth mounting key; 43. Upper connector; 44. Second pressure sensor; 45. Third pressure sensor; 46. Upper short circuit; 47. Sealing assembly; 48. Threaded sleeve; 49. Second sealing ring; 40. Anti-rotation sleeve; 41. Central tube; 42. Motor; 43. Rotor. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] A large-diameter downhole cable-controlled annular packer can be used for reservoir containment in field construction processes such as formation stratified sampling and testing, stratified oil production, and water plugging. It can also monitor the pressure in the upper, lower, and central channels of the packer. Figure 1 As shown, the packer and the ground control system can be connected via logging cables to achieve remote real-time control of the packer's setting and unsealing from the ground. Its main structure includes a transmission mechanism, an upper pressure measuring mechanism, a lower pressure measuring mechanism, and a cylinder liner assembly.

[0063] Combination Figure 2 and Figure 3The large-diameter downhole cable-controlled annular packer of the present invention includes a transmission mechanism and a central tube 48, wherein the transmission mechanism is mounted on the surface of the central tube 48;

[0064] Specifically, the transmission mechanism includes an output shaft 13, a double gear 20, an eccentric transmission sleeve 21, a second internal gear 29, and a motor 49. The output shaft 13 is installed inside the motor 49 and is coaxially arranged with the central tube 48. When the motor 49 is working, it drives the output shaft 13 to rotate. The eccentric transmission sleeve 21 is keyed to the output shaft 13 and is coaxially arranged with the central tube 48. When the output shaft 13 rotates, it can drive the eccentric transmission sleeve 21 to rotate. A transmission gear 19 is fixedly connected to the surface of the eccentric transmission sleeve 21. The transmission gear 19 is eccentrically arranged with the central tube 48, and the outer surface of the transmission gear 19 meshes with the inner surface of the double gear 20. The eccentric transmission sleeve 21 drives the double gear 20 to rotate through the transmission gear 19. The upper gear of the double gear 20 meshes with the second internal gear 29. The second internal gear 29 meshes with a lead screw 34 and drives the lead screw 34 to rotate. Both the second internal gear 29 and the lead screw 34 are coaxially arranged with the central tube 48.

[0065] It should be noted that in the above structure, the motor 49 drives the output shaft 13 to rotate, and then the output shaft 13 drives the eccentric transmission sleeve 21 to rotate. Since the eccentric transmission sleeve 21 rotates eccentrically, the transmission gear 19 will also rotate eccentrically. Then, the transmission gear 19 drives the double gear 20 to rotate eccentrically, and then the double gear 20 drives the second internal gear 29 to rotate. Finally, the second internal gear 29 drives the lead screw 34 to rotate.

[0066] It should be further explained that the large-diameter downhole cable-controlled annular packer of the present invention has a large-diameter central tube 48, which provides a channel for delivering measurement and adjustment instruments, dropping balls, and transferring fluids.

[0067] Furthermore, in Figure 2 In the motor 49, the rotor 491 of the motor 49 is connected to the output shaft 13 by a first mounting key 12. A second nut 11 is provided on the outside of the first mounting key 12 to block the first mounting key 12. The second nut 11 is fixedly connected to the output shaft 13. In addition, a second mounting key 18 is installed between the eccentric transmission sleeve 21 and the output shaft 13. A third nut 17 is provided on the outside of the second mounting key 18. The third nut 17 is fixedly connected to the eccentric transmission sleeve 21.

[0068] It should be noted that the function of the second nut 11 is to block the first mounting key 12. The first mounting key 12 fixes the rotor 491 of the motor 49 to the output shaft 13, thereby driving the output shaft 13 to rotate. The function of the third nut 17 is to block the second mounting key 18.

[0069] Furthermore, in Figure 2In the middle, the inner wall of the third cylinder liner 22 is keyed to the first internal gear 24, and the first internal gear 24 meshes with the lower gear of the double gear 20. Specifically, a third mounting key 23 is installed between the third cylinder liner 22 and the first internal gear 24. One end of the third mounting key 23 is fixedly connected to the third cylinder liner 22, and the other end is embedded in the outer surface of the first internal gear 24.

[0070] It should be noted that the function of the third mounting key 23 is to lock the first internal gear 24 so that it will not rotate. When the double gear 20 rotates, its lower gear can move along the tooth surface of the first internal gear 24.

[0071] It should be noted that a positioning sleeve 25 can also be installed between the upper and lower gears of the double gear 20. The purpose of this is that the double gear 20 has an installation gap along the central tube 48. The positioning sleeve 25 can fill the installation gap to prevent the double gear 20 from moving axially.

[0072] It needs to be further explained that, in combination Figure 2 and Figure 3 It can be seen that the second internal gear 29 can be designed as a hollow structure. In order to make the second internal gear 29 rotate more smoothly while ensuring strength, a third bearing 26, a bearing sleeve 27 and a spacer sleeve 28 can be installed in the second internal gear 29. The bearing sleeve 27 is installed on the central tube 48, and then two third bearings 26 are installed between the bearing sleeve 27 and the second internal gear 29. Finally, two spacer sleeves 28 are installed between the two third bearings 26.

[0073] Furthermore, such as Figure 3 As shown, the lead screw 34 includes a gear end 341 and a lead screw end 342. The gear end 341 meshes with the second internal gear 29, and the lead screw end 342 is threaded with a nut 33.

[0074] It should be noted that the gear end 341 can also be designed as a hollow structure. In order to ensure strength and smoother rotation, a support 30 and a fourth bearing 31 can be installed inside the gear end 341. The support 30 is coaxially arranged with the central tube 48 and has shoulders on both sides. The fourth bearing 31 is installed between the front shoulder of the support 30 and the gear end 341, and the rear shoulder abuts against the third bearing 26.

[0075] Furthermore, such as Figure 3 As shown, the large-diameter downhole cable-controlled annular packer also includes a rubber sleeve shaft 35, which is coaxially arranged with the central tube 48. The rubber sleeve shaft 35 has a stepped cylindrical structure, with one end fixedly sleeved on the surface of the nut 33, and the nut 33 is blocked axially by a shoulder.

[0076] It should be noted that when the lead screw 34 rotates, it can drive the nut 33 to axially press the rubber sleeve shaft 35 along the central tube 48. In addition, the larger diameter end of the rubber sleeve shaft 35 is fitted onto the nut 33, locking the rotation of the nut 33.

[0077] Furthermore, such as Figure 4 As shown, one end of the rubber sleeve shaft 35 is located inside the fourth cylinder liner 32, and the other end extends to the outside of the fourth cylinder liner 32. A lower pressure ring 36, a rubber sleeve 37, and an upper pressure ring 38 are coaxially arranged on the outer surface of the rubber sleeve shaft 35 in sequence. The lower pressure ring 36 abuts against the fourth cylinder liner 32 and is fixedly connected to the rubber sleeve shaft 35. The rubber sleeve 37 abuts against the lower pressure ring 36 and is slidably connected to the rubber sleeve shaft 35. The upper pressure ring 38 abuts against the lower pressure ring 36 and is slidably connected to the rubber sleeve shaft 35. Moreover, a fourth mounting key 39 is keyed to the anti-rotation sleeve 47 on the inner wall of the rubber sleeve shaft 35. One end of the fourth mounting key 39 is embedded in the anti-rotation sleeve 47, and the other end is slidably connected to the rubber sleeve shaft 35.

[0078] It should be noted that when the rubber sleeve shaft 35 moves to the side of the lower pressure ring 36, it will squeeze the lower pressure ring 36, and then the lower pressure ring 36 will squeeze the rubber sleeve 37. In addition, the anti-rotation sleeve 47 is fixed differently, so that the rubber sleeve shaft 35 cannot rotate under the action of the nut 33, but slides along the central tube 48 axially.

[0079] It should be further noted that a second sealing ring 46 is also provided between the upper pressure ring 38 and the upper connector 40.

[0080] Furthermore, combined Figure 1 , Figure 2 , Figure 3 and Figure 5 It is known that a cylinder liner assembly is provided on the outside of the transmission mechanism. The cylinder liner assembly includes a first cylinder liner 6, a first connecting sleeve 10, a second cylinder liner 15, a second connecting sleeve 16, a third cylinder liner 22, and a fourth cylinder liner 32. The first connecting sleeve 10 is annular, and its two ends overlap with the first cylinder liner 6 and the second cylinder liner 15, respectively. The second connecting sleeve 16 is annular, and its two ends overlap with the second cylinder liner 15 and the third cylinder liner 22, respectively. The end of the third cylinder liner 22 away from the second cylinder liner 15 overlaps with the fourth cylinder liner 32.

[0081] Furthermore, a first bearing 9 is installed on the inner wall of the first connecting sleeve 10;

[0082] A second bearing 14 is installed on the inner wall of the second connecting sleeve 16;

[0083] The inner rings of the first bearing 9 and the second bearing 14 are both coaxially mounted on the surface of the output shaft 13.

[0084] Furthermore, such as Figure 3As shown, the large-diameter downhole cable-controlled annular packer also includes an upper pressure measuring mechanism, which includes an upper connector 40 and an upper short connector 43. The upper connector 40 overlaps with the upper pressure ring 38 and is fixedly sleeved on the upper short connector 43. The upper short connector 43 is fixedly sleeved on the central tube 48. In addition, a second pressure sensor 41 and a third pressure sensor 42 are installed on the end face of the upper short connector 43 facing the anti-rotation sleeve 47.

[0085] It should be noted that the second pressure sensor 41 is used to measure the liquid pressure outside the packer, and the third pressure sensor 42 is used to measure the liquid pressure at the center tube 48.

[0086] Furthermore, such as Figure 5 As shown, the large-diameter downhole cable-controlled annular packer also includes a lower pressure testing mechanism, which includes a lower short connector 1, a sealing tube 2, and a first nut 3. The lower short connector 1 is fixedly sleeved on the sealing tube 2 and overlaps with the first cylinder liner 6. The first nut 3 is threadedly connected to the lower short connector 1 and abuts against the first cylinder liner 6. The sealing tube 2 is fixedly connected to the central tube 48. A first pressure sensor 5 is installed on the end face of the lower short connector 1 facing the central tube 48.

[0087] It should be noted that, Figure 5 In the middle, a first sealing ring 4 is also provided between the lower short-circuit 1 and the first cylinder liner 6 to improve the sealing performance.

[0088] Furthermore, both the lower shorting 1 and the upper shorting 43 have through holes on their end faces. A sealing assembly 44 is installed in the through hole, and a threaded sleeve 45 is embedded in the inner wall. In addition, a circuit board 7 is installed on the surface of the sealing tube 2. The circuit board 7 is connected to a wire 8, which is connected to the first pressure sensor 5, the second pressure sensor 41, the third pressure sensor 42, the sealing assembly 44, and the motor 49, respectively.

[0089] It should be noted that circuit board 7 can receive external information and then control the operation of motor 49. Secondly, circuit board 7 can power the first pressure sensor 5, the second pressure sensor 41 and the third pressure sensor 42.

[0090] This invention relates to a large-diameter downhole cable-controlled annular packer, the operation sequence of which is as follows:

[0091] 1. Connect the packers and other tools in a series on the ground according to the construction design;

[0092] 2. During operation, the packer is lowered into the wellbore to the designed depth along with the tool string. The command is sent through the ground control system, the internal motor 49 of the intelligent packer starts, the compression rubber sleeve 37 sets the seal, and the upper and lower pressures and internal pressure are self-monitored.

[0093] 3. After the operation is completed, the ground sends another command, the motor 49 inside the packer reverses, the rubber sleeve 37 elastically recovers, and the packing is successfully released;

[0094] 4. The packer can be carried along with the tool string to the next stage of operation or lifted to the ground.

[0095] The sealing process of this invention is as follows:

[0096] The upper connector 40 is short-circuited to the upper tool (not shown in the figure). After the cable is lowered to the set position, the signal is transmitted to the circuit board 7 through the control program of the ground control box. The circuit board 7 executes the program to control the motor 49 to rotate forward, which drives the output shaft 13 to rotate. The second mounting key 18 drives the eccentric transmission sleeve 21 to rotate. The rotation of the eccentric transmission sleeve 21 drives the differential double gear 20 to rotate, which then transmits to the second internal gear 29, and then to the lead screw 34. The lead screw 34 rotates and transmits the torque to the nut 33. The nut 33 drives the rubber sleeve shaft 35 to rotate clockwise, and transmits the force to the rubber sleeve 37 through the lower pressure ring 36. The rubber sleeve 37 compresses and sets the seal.

[0097] The unsealing process of this invention is as follows:

[0098] The upper connector 40 is short-circuited to the upper tool (not shown in the figure). After the cable is lowered into the well to the set position, the signal is transmitted to the circuit board 7 through the control program of the ground control box. The circuit board 7 executes the program to control the motor 49 to reverse, which drives the output shaft 13 to rotate. The second mounting key 18 drives the eccentric transmission sleeve 21 to rotate. The rotation of the eccentric transmission sleeve 21 drives the differential double gear 20 to rotate, which then transmits to the second internal gear 29, and then to the lead screw 34. The lead screw 34 rotates and transmits the torque to the nut 33. The nut 33 drives the rubber sleeve shaft 35 to rotate to the left, and transmits the force to the rubber sleeve 37 through the lower pressure ring 36. The rubber sleeve 37 is then unsealed.

[0099] The pressure measurement process of this invention is as follows:

[0100] The first pressure sensor 5 is installed on the lower short circuit 1. The lower short circuit 1 has a liquid passage that connects to the outer cavity and measures the external pressure at the lower end of the rubber cylinder 37.

[0101] The second pressure sensor 41 is installed on the upper short circuit 43. The upper short circuit 43 has a liquid passage that connects to the outer cavity and measures the external pressure at the upper end of the glue cylinder 37.

[0102] The third pressure sensor 42 is installed on the upper shorting circuit 43. The upper shorting circuit 43 has an internal liquid passage that connects to the inner cavity and measures the center pressure of the central tube 48.

[0103] It should be noted that the large-diameter downhole cable-controlled annular packer of the present invention can be used to control the single-layer packing of each oil layer in the well in real time, and can also monitor the pressure data of the packing layer and the pressure data of the central channel.

[0104] It should be noted that the large-diameter downhole cable-controlled annular packer of the present invention is generally composed of multiple intelligent packers connected by a continuous cable pipe, which can realize the layered production, layered testing and sampling of oil wells. This is of great significance for accurately grasping development data such as pressure and fluid parameters of each reservoir.

[0105] It should be noted that the large-diameter downhole cable-controlled annular packer of the present invention has high identification accuracy, enabling precise identification of differential pressure load and unsealing load after packer setting; high control accuracy, with precise control of the compression distance of the rubber sleeve 37; and strong human-machine interaction, enabling direct monitoring of the working status of the electric packer from the ground.

[0106] It should be further explained that the large-diameter downhole cable-controlled annular packer of the present invention is a closed-loop control with a high degree of intelligence. When the packer is set, current feedback is used first. When the current reaches the allowable current value for compression of the rubber sleeve 37, it is initially judged that the packer has been successfully set. At the same time, considering the difference in inner diameter of different casings, position feedback is also provided, that is, the distance that the packer should compress when sealing a specified inner diameter of the casing. This serves as a safety basis for judging the successful setting of the packer and plays a role in protecting the packer rubber sleeve 37.

[0107] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large-diameter downhole cable-controlled annular packer, characterized in that, Including the transmission mechanism and the central tube (48); The transmission mechanism is mounted on the surface of the central tube (48); The transmission mechanism includes an output shaft (13), a double gear (20), an eccentric transmission sleeve (21), a second internal gear (29), and a motor (49); The output shaft (13) is installed inside the motor (49) and is coaxially arranged with the central tube (48); The eccentric transmission sleeve (21) is keyed to the output shaft (13) and coaxially arranged with the central tube (48). The output shaft (13) is used to drive the eccentric transmission sleeve (21) to rotate. The eccentric transmission sleeve (21) has a transmission gear (19) fixedly connected to its surface. The transmission gear (19) is eccentrically set with the central tube (48), and the outer surface of the transmission gear (19) meshes with the inner surface of the double gear (20). The eccentric transmission sleeve (21) drives the double gear (20) to rotate through the transmission gear (19). The upper gear of the double gear (20) meshes with the second internal gear (29), and the second internal gear (29) meshes with a lead screw (34); The second internal gear (29) and the lead screw (34) are both coaxially arranged with the central tube (48).

2. The large-diameter downhole cable-controlled annular packer according to claim 1, characterized in that, The transmission mechanism is externally provided with a cylinder liner assembly, which includes a first cylinder liner (6), a first connecting sleeve (10), a second cylinder liner (15), a second connecting sleeve (16), a third cylinder liner (22), and a fourth cylinder liner (32). The first connecting sleeve (10) is annular, and the two ends of the annular surface overlap with the first cylinder liner (6) and the second cylinder liner (15) respectively; The second connecting sleeve (16) is annular, and the two ends of the annular surface overlap with the second cylinder liner (15) and the third cylinder liner (22) respectively; The end of the third cylinder liner (22) away from the second cylinder liner (15) overlaps with the fourth cylinder liner (32).

3. A large-diameter downhole cable-controlled annular packer according to claim 2, characterized in that, The first connecting sleeve (10) has a first bearing (9) installed on its inner wall; The second connecting sleeve (16) has a second bearing (14) installed on its inner wall; The inner rings of the first bearing (9) and the second bearing (14) are coaxially disposed on the surface of the output shaft (13).

4. A large-diameter downhole cable-controlled annular packer according to claim 2, characterized in that, The inner wall of the third cylinder liner (22) is keyed with a first internal gear (24), which meshes with the lower gear of the double gear (20).

5. A large-diameter downhole cable-controlled annular packer according to claim 2, characterized in that, The lead screw (34) includes a gear end (341) and a lead screw end (342); The gear end (341) meshes with the second internal gear (29); The lead screw end (342) is threaded with a nut (33).

6. A large-diameter downhole cable-controlled annular packer according to claim 5, characterized in that, It also includes a rubber sleeve shaft (35), which is coaxially arranged with the central tube (48); The rubber sleeve shaft (35) has a stepped cylindrical structure, with one end fixedly sleeved on the surface of the nut (33), and the nut (33) is blocked axially by a shoulder.

7. A large-diameter downhole cable-controlled annular packer according to claim 6, characterized in that, One end of the rubber sleeve shaft (35) is located inside the fourth cylinder liner (32), and the other end extends to the outside of the fourth cylinder liner (32); The outer surface of the rubber sleeve shaft (35) is coaxially provided with a lower pressure ring (36), a rubber sleeve (37) and an upper pressure ring (38); The lower pressure ring (36) abuts against the fourth cylinder liner (32) and is fixedly connected to the rubber sleeve shaft (35); The rubber sleeve (37) abuts against the lower pressure ring (36) and is slidably connected to the rubber sleeve shaft (35); The upper pressure ring (38) abuts against the lower pressure ring (36) and is slidably connected to the rubber sleeve shaft (35).

8. A large-diameter downhole cable-controlled annular packer according to claim 7, characterized in that, The inner wall anti-rotation sleeve (47) of the rubber tube shaft (35) is keyed with a fourth mounting key (39). One end of the fourth mounting key (39) is embedded in the anti-rotation sleeve (47), and the other end is slidably connected to the rubber tube shaft (35).

9. A large-diameter downhole cable-controlled annular packer according to claim 5, characterized in that, It also includes an upper pressure testing mechanism, which includes an upper connector (40) and an upper short circuit (43); The upper connector (40) overlaps with the upper pressure ring (38) and is fixedly sleeved on the upper short connector (43); The upper short-circuit (43) is fixedly sleeved on the central tube (48); The upper short circuit (43) is equipped with a second pressure sensor (41) and a third pressure sensor (42) on the end face of the anti-rotation sleeve (47).

10. A large-diameter downhole cable-controlled annular packer according to claim 9, characterized in that, It also includes a lower pressure testing mechanism, which includes a lower shorting connector (1), a sealing tube (2), and a first nut (3); The lower short connector (1) is fixedly sleeved on the sealing tube (2) and overlaps with the first cylinder liner (6); The first nut (3) is threadedly connected to the lower short connector (1) and abuts against the first cylinder liner (6); The sealing cannula (2) is fixedly connected to the central tube (48); A first pressure sensor (5) is installed on the end face of the lower short circuit (1) facing the central tube (48).

11. A large-diameter downhole cable-controlled annular packer according to claim 10, characterized in that, Both the lower short connector (1) and the upper short connector (43) have through holes on their end faces. A sealing assembly (44) is installed in the through hole, and a threaded sleeve (45) is embedded in the inner wall.

12. A large-diameter downhole cable-controlled annular packer according to claim 10, characterized in that, The surface of the sealed cannula (2) is also fitted with a circuit board (7); The circuit board (7) is connected to wires (8), which are respectively connected to the first pressure sensor (5), the second pressure sensor (41), the third pressure sensor (42), the sealing assembly (44) and the motor (49).

13. A large-diameter downhole cable-controlled annular packer according to claim 1, characterized in that, A second mounting key (18) is installed between the eccentric transmission sleeve (21) and the output shaft (13). A third nut (17) is provided on the outside of the second mounting key (18), and the third nut (17) is fixedly connected to the eccentric transmission sleeve (21).

14. A large-diameter downhole cable-controlled annular packer according to any one of claims 1-13, characterized in that, The rotor (491) of the motor (49) is connected to the output shaft (13) by a first mounting key (12). A second nut (11) is provided on the outside of the first mounting key (12) to block the first mounting key (12). The second nut (11) is fixedly connected to the output shaft (13).

15. A large-diameter downhole cable-controlled annular packer according to claim 4, characterized in that, A third mounting key (23) is installed between the third cylinder liner (22) and the first internal gear (24). One end of the third mounting key (23) is fixedly connected to the third cylinder liner (22), and the other end is embedded in the outer surface of the first internal gear (24).

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