A PEEK equal-pressure bi-directional sealing device for a completion tool

Abstract

The present invention discloses a PEEK equal-pressure bi-directional sealing device for a completion tool, belonging to the technical field of sealing. The present invention at least includes two sections preset in an underground oil well pipe, an installation and positioning mechanism, and a sealing mechanism. The sealing mechanism is installed in the oil well pipe, the installation and positioning mechanism is sleeved in the sealing mechanism, and the installation and positioning mechanism is electrically connected to the sealing mechanism. The sealing mechanism connects and seals the two sections of the oil well pipe, and the installation and positioning mechanism positions and installs the sealing mechanism. By providing two V-shaped sealing rings with opposite V-shaped openings, the pressure pressing the inside of the oil well pipe towards the outside of the pipe is decomposed by the V-shaped sealing rings. The two beams of force pointing to the pipe wall make the V-shaped sealing ring fit more closely with the oil well pipe. The other two beams of force pointing to the axis are equal in magnitude and balance each other, reducing the direct force on the sealing ring, prolonging the service life, and keeping the sealing mechanism from sliding at the position where the two sections of the oil well pipe are connected, realizing the function of bi-directional equal-pressure sealing of the oil well pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and particularly to a PEEK equal-pressure bi-directional sealing device for well completion tools. Background Art

[0002] Well completion refers to the process of connecting the bottom of a well drilled to the exploration depth to the oil layer in a certain structure after the open-hole well is drilled. It is the last link of the drilling work and at the same time the beginning of the oil production engineering. The well completion method has a simple process and low cost. However, the quality of the well completion process directly affects the production capacity and economic life of the oil well. In order to ensure the long-term stable production of oil and gas wells, well completion should meet the requirements of effectively connecting the oil and gas layers with the wellbore, small flow resistance of the oil and gas flow, effectively isolating the oil layer, gas layer or water layer, and being able to overcome or reduce the influence of the collapse and sand production of the oil and gas layer wellbore wall.

[0003] In the past well completion process, the sealing devices used were basically single-substance structure sealing rings. After long-term use, these sealing rings are affected by the complex external environment, gradually become aged or corroded, and lose the sealing function; the situation of underground excavation of oil wells will vary according to the actual situation. If the oil well pipe needs to be bent and turned during the propulsion process, the traditional sealing ring bears uneven pressure in each direction between two sections of oil well pipes. Working in an environment of uneven stress for a long time causes the sealing ring to undergo excessive plastic deformation, and the contact surface at the bending connection position decreases, resulting in a reduction in the production pressure of the entire oil well.

[0004] If the diameter of the well completion tubing changes, the sealing requirements between the reduced-diameter pipes are more stringent. The diameter of ordinary sealing rings is a fixed value, so they cannot be used. And the sealing sleeve needs to be tightly installed, which cannot be achieved in the narrow oil well pipe. Therefore, only equal-diameter oil well pipes can be installed, and the rate of oil and gas production cannot be increased at a low cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a PEEK equal-pressure bi-directional sealing device for well completion tools to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A PEEK equal-pressure bi-directional sealing device for well completion tools, at least including two sections preset in the underground oil well pipe. The device includes an installation and positioning mechanism and a sealing mechanism. The sealing mechanism is installed in the oil well pipe, the installation and positioning mechanism is sleeved in the sealing mechanism, and the installation and positioning mechanism is electrically connected to the sealing mechanism. The sealing mechanism connects and seals the two sections of oil well pipes, and the installation and positioning mechanism positions and installs the sealing mechanism.

[0007] Furthermore, the sealing mechanism includes a universal joint assembly, a group of adjustment assemblies are provided at both ends of the universal joint assembly, and a sealing ring is connected to each group of the adjustment assemblies. The universal joint assembly enables the sealing mechanism to adapt to the angle of two sections of the oil well pipe. The adjustment assembly adjusts the length of the sealing ring, and the sealing ring contacts the oil well pipe to seal the oil well pipe.

[0008] Furthermore, each of the sealing rings includes a peek sealing body and a V-shaped sealing ring. A pair of the peek sealing bodies are installed at both ends of the universal joint assembly. A plurality of layers of V-shaped sealing rings are arranged between each peek sealing body. The plurality of layers of V-shaped sealing rings are evenly arranged in the peek sealing body. The directions of the V-shaped openings of the plurality of layers of V-shaped sealing rings are consistent. The direction of the V-shaped opening is toward one end of the universal joint assembly, and one end of the V-shaped pointed bottom is toward the outside. After oil and gas are introduced into the oil well pipe, the pressure in the entire pipe is evenly distributed, and the evenly distributed pressure acts on the left sealing body and the right sealing body. The oil The pressure from the inside of the well pipe to the outside of the pipe is decomposed into two directions of force by the V-shaped sealing ring, which are transmitted along the two sides of the V shape respectively. One force supports the wall of the oil well pipe, and the other force acts on the central axis of the sealing mechanism. The two forces acting on the central axis of the sealing mechanism by the left sealing body and the right sealing body are equal in magnitude and opposite in direction, and are balanced with each other. The two forces directed to the wall of the oil well pipe make the V-shaped sealing ring fit the wall of the oil well pipe more closely, strengthen the sealing effect, balance the forces at both ends of the sealing mechanism, and keep the sealing mechanism from sliding at the position where the two sections of the oil well pipe are connected;

[0009] By arranging two V-shaped sealing rings with opposite V-shaped openings, the pressure acting on the V-shaped sealing ring is decomposed and transmitted to the sealing mechanism and the wall of the oil well pipe, thereby reducing the direct force on the sealing ring, extending the service life of the sealing ring, and achieving the purpose of bidirectional equal pressure sealing of the oil well pipe.

[0010] Further, the gimbal assembly includes two adapter brackets and a connecting ring. The two adapter brackets are a left-turn bracket ring and a right-turn bracket ring. The left-turn bracket ring is rotatably installed at one end of the connecting ring, and the right-turn bracket ring is rotatably installed at the other end of the connecting ring. The rotation axis line of the left-turn bracket ring is perpendicular to the rotation axis line of the right-turn bracket ring. A peek seal body is connected to the ends of the left-turn bracket ring and the right-turn bracket ring away from the connecting ring. An adjustment assembly is also provided at the ends of the left-turn bracket ring and the right-turn bracket ring away from the connecting ring. A rubber tube is provided on the inner ring of the connecting ring. The ports at both ends of the rubber tube are connected to the outer ports of the two peek seal bodies. When there is a bending angle at the connection of the oil well pipes, through the rotation adjustment between the left-turn bracket ring, the right-turn bracket ring and the connecting ring, the axes of the left seal body and the right seal body are aligned with the two oil well pipes to be sealed and connected, that is, the circumference of each V-shaped sealing ring can contact the inner wall of the oil well pipe, and the degree of contact is the same, avoiding the bending deformation of the sealing device, resulting in uneven contact between the sealing ring and the pipe wall, and reducing the production pressure of the entire oil well.

[0011] Further, each set of the adjustment assembly includes an internally threaded fixed ring, a gear, an angle motor and a plurality of screwing arms. The internally threaded fixed ring is rotatably arranged at the ends of the left-turn bracket ring and the right-turn bracket ring connected to the peek seal body. The two gears and the two angle motors are arranged inside the left-turn bracket ring and the right-turn bracket ring. The gear is arranged on the motor shaft of the angle motor. A thread groove is opened on the inner ring of the internally threaded fixed ring, and a tooth groove is arranged on the outer ring of the internally threaded fixed ring. The tooth groove is in meshing transmission with the gear. At least three screwing arms are arranged on each layer of the peek seal body. A thread guiding groove is opened on the screwing arm, and the thread guiding groove is matched with the thread groove. The length of the screwing arm changes with the distance between each layer of the peek seal body and the left-turn bracket ring or the right-turn bracket ring. After the sealing device is positioned, the installation positioning mechanism supplies current to the two angle motors. The angle motor drives the gear to rotate, and the gear then drives the internally threaded fixed ring to rotate. A plurality of screwing arms cooperating with the internally threaded fixed ring drive each layer of the peek seal body to move. When the gap between each layer of the peek seal body becomes smaller, the V-shaped sealing ring is extruded and extends outwards. The extended part contacts the pipe wall of the oil well pipe to seal the oil well pipe. Since the degree of the V-shaped sealing ring being extruded and extending outwards can be adjusted by the internally threaded fixed ring, the V-shaped sealing ring of this sealing device is suitable for sealing two oil well pipes with different inner wall diameters. After the sealing is completed, the oil and gas flow through the rubber tube, realizing that the sealing device can be installed from the inside of the oil well pipe, and can also be suitable for changing pipe diameters, is convenient for installation and disassembly, and has reliable sealing.

[0012] Further, the installation and positioning mechanism includes a guide, a flexible shaft, and a magnetic head seat. The flexible shaft is sleeved in a rubber tube. The guide is arranged on one side of the flexible shaft close to the left turntable ring. A locking assembly is arranged inside the guide. The magnetic head seat is arranged on one side of the flexible shaft close to the right turntable ring. A positioning assembly is arranged inside the magnetic head seat. The sealing mechanism is sleeved on the installation and positioning mechanism. Workers guide the installation and positioning mechanism to move in the oil well pipe through a guide cable.

[0013] Further, a hydraulic circuit is arranged inside the guide. A hydraulic groove is formed in the flexible shaft near one end of the guide. The hydraulic groove is communicated with the hydraulic circuit. The locking assembly at least includes a pair of clamping pins and a piston. At least a pair of the clamping pins are slidably arranged in the hydraulic circuit. The piston is slidably installed in the hydraulic groove. A piston spring is arranged between the piston and the flexible shaft. A servo motor is arranged in the flexible shaft. A cam is installed on the motor shaft of the servo motor. The cam is in contact with the piston. When the installation and positioning mechanism reaches the installation position, the servo motor drives the cam to rotate. The cam pushes the piston. The piston moves to push out all the clamping pins through the hydraulic circuit. The clamping pins contact and tighten against the inner wall of the oil well pipe, so that the installation and positioning mechanism cannot move further. Then, power is supplied to the two angle motors through the installation and positioning mechanism to enable the sealing mechanism to perform sealing and locking. When the clamping pins need to be retracted, the servo motor drives the cam to rotate again. The piston resets under the action of the piston spring, and the clamping pins retract into the guide.

[0014] Furthermore, a plurality of arc-shaped slots are provided in the magnetic head seat, an empty slot is provided in the flexible shaft near one end of the magnetic head seat, a plurality of the arc-shaped slots are connected to the empty slots, a pressure sensor is provided between the magnetic head seat and the flexible shaft, the positioning assembly includes at least a pair of magnetic chucks, at least a pair of the magnetic chucks are slidably installed in the arc-shaped slots, a winding motor is provided in the empty slot, a rope drum is installed on the motor shaft of the winding motor, at least two tension ropes are wound on the rope drum, at least one end of the two tension ropes are connected to a pair of the magnetic chucks through a guide wheel, a magnetic head spring is provided between each magnetic chuck and the magnetic head seat, when the installation positioning mechanism moves, the magnetic chuck moves in the oil well pipe, and since the oil well pipe is made of metal, the magnetic of the magnetic chuck The force lines pass through the wall of the oil well pipe, forming an induced current in the wall. The induced current generates a new magnetic field that is opposite to the magnetic field of the magnetic chuck, which hinders the movement of the magnetic chuck. When the magnetic chuck passes through the position where two sections of the oil well pipe are connected, the induced current in the pipe wall is interrupted, the resistance to the magnetic chuck becomes smaller, and the pressure sensor detects the change in pressure, so that the servo motor is powered on. During the period of time when the servo motor responds, the installation positioning mechanism is still moving. When the clamp pin contacts and presses against the inner wall of the oil well pipe, the sealing mechanism is between the two sections of the oil well pipe. After sealing through the sealing mechanism, the control system is used to pass current into the winding motor, and the winding motor drives the rope drum to rotate and wind up the two tension ropes. The magnetic chuck retracts into the magnetic head seat, and the installation positioning mechanism is taken out through the guide rope.

[0015] Furthermore, a pair of the peek sealing bodies are divided into a left sealing body and a right sealing body, the left sealing body is connected to the left rotating frame ring, and the right sealing body is connected to the right rotating frame ring.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] 1. By setting two V-shaped sealing rings with opposite V-shaped openings, the pressure from the inside of the oil well pipe to the outside of the pipe is decomposed by the V-shaped sealing ring into two directions of force and transmitted along the two sides of the V shape. One force supports the wall of the oil well pipe, and the two forces directed to the wall of the oil well pipe make the V-shaped sealing ring fit the wall of the oil well pipe more closely, thereby enhancing the sealing effect and balancing the forces at both ends of the sealing mechanism. The other force acts on the central axis of the sealing mechanism. The two forces acting on the central axis of the sealing mechanism by the left sealing body and the right sealing body are equal in magnitude and opposite in direction, and are balanced with each other, thereby reducing the direct force on the sealing ring, extending the service life of the sealing ring, and keeping the sealing mechanism from sliding at the position where the two sections of the oil well pipe are connected, thereby achieving the purpose of bidirectional isobaric sealing of the oil well pipe.

[0018] 2. Several screw arms that cooperate with the internal-thread fixed ring drive the peek seal bodies of each layer to move. The gap between the peek seal bodies of each layer becomes smaller, causing the V-shaped sealing ring to be extruded and extend outwards. The extended part contacts the pipe wall of the oil well pipe, sealing the oil well pipe. Since the degree of outward extension of the V-shaped sealing ring due to pressure can be adjusted by the internal-thread fixed ring, the V-shaped sealing ring of this sealing device is applicable to sealing two oil well pipes with different inner wall diameters. It realizes that the sealing device can be installed from the inside of the oil well pipe and is also applicable to changing pipe diameters, with convenient installation and disassembly and reliable sealing.

[0019] 3. The magnetic chuck moves in the oil well pipe to form an induced current. The induced current generates a new magnetic field to attract the magnetic chuck. When the magnetic chuck passes through the position where two oil well pipes are connected, the induced current in the pipe wall is interrupted, and the resistance received by the magnetic chuck becomes smaller. The change in pressure is detected through a pressure sensor, realizing the function of automatically positioning the installation position of the sealing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1 is a schematic connection diagram of the sealing device of the present invention and the oil well pipe;

[0022] Figure 2 is an external structure schematic diagram of the installation positioning mechanism of the present invention;

[0023] Figure 3 is a structural schematic diagram of the installation positioning mechanism and the sealing mechanism of the present invention;

[0024] Figure 4 is a partial structural schematic diagram of the sealing mechanism of the present invention;

[0025] Figure 5 is a structural schematic diagram of the sealing ring of the present invention;

[0026] Figure 6 is a structural schematic diagram of the left sealing body part of the present invention;

[0027] Figure 7 is the present invention Figure 6 a partial enlarged view of area A in;

[0028] Figure 8 is a left view schematic diagram of the left sealing body of the present invention;

[0029] In the figure: 1. Guide; 2. Pin; 3. Piston; 4. Piston spring; 5. Cam; 6. Servo motor; 7. Cable drum; 8. Rewinding motor; 9. Tension rope; 10. Magnetic chuck; 11. Magnetic head spring; 12. Pressure sensor; 13. Flexible shaft; 14. Magnetic head seat; 15. Rubber tube; 16. Left seal body; 17. Right seal body; 18. V-shaped sealing ring; 19. Left turntable ring; 20. Right turntable ring; 21. Connecting ring; 22. Inner-thread fixed ring; 231. Short screw connection arm; 232. Long screw connection arm; 24. Gear; 25. Angle motor; 26. Oil well pipe. Detailed implementation manner

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1-8 , the present invention provides a technical solution: a peek isobaric bi-directional sealing device for a well completion tool, including two sections preset in the underground oil well pipe 26. The device further includes an installation and positioning mechanism and a sealing mechanism. The sealing mechanism is installed in the oil well pipe 26, the installation and positioning mechanism is sleeved in the sealing mechanism, the installation and positioning mechanism is electrically connected to the sealing mechanism, the sealing mechanism connects and seals the two sections of the oil well pipe 26, and the installation and positioning mechanism positions and installs the sealing mechanism.

[0032] The sealing mechanism includes a universal joint assembly, and a group of adjustment assemblies are provided at both ends of the universal joint assembly. A sealing ring is connected to each group of adjustment assemblies. The universal joint assembly enables the sealing mechanism to adapt to the angle of the two sections of oil well pipes 26. The adjustment assembly adjusts the length of the sealing ring. The sealing ring contacts the oil well pipe 26 and seals the oil well pipe 26. Each sealing ring includes a peek sealing body and a V-shaped sealing ring 18. A pair of peek sealing bodies are installed at both ends of the universal joint assembly. The pair of peek sealing bodies are divided into a left sealing body 16 and a right sealing body 17. The left sealing body 16 is connected to the left rotating frame ring 19, and the right sealing body 17 is connected to the right rotating frame ring 20. Two layers of V-shaped sealing rings 18 are arranged between each peek sealing body. The two layers of V-shaped sealing rings 18 are evenly arranged in the peek sealing body. The directions of the V-shaped openings of the two layers of V-shaped sealing rings 18 are consistent, and the direction of the V-shaped opening is toward one end of the universal joint assembly. One end of the pointed bottom faces outward. After oil and gas are introduced into the oil well pipe 26, the pressure in the whole pipe is evenly distributed, and the evenly distributed pressure acts on the left sealing body 16 and the right sealing body 17. The pressure from the inside of the oil well pipe 26 to the outside of the pipe is decomposed into two directions of force by the V-shaped sealing ring 18, which are transmitted along the two sides of the V shape respectively. One force supports the wall of the oil well pipe 26, and the other force acts on the central axis of the sealing mechanism. The two forces acting on the central axis of the sealing mechanism by the left sealing body 16 and the right sealing body 17 are equal in magnitude and opposite in direction, and are balanced with each other. The two forces directed to the wall of the oil well pipe 26 make the V-shaped sealing ring 18 fit the wall of the oil well pipe 26 more closely, thereby enhancing the sealing effect, reducing the direct force on the sealing ring, and extending the service life of the sealing ring, so as to achieve the purpose of bidirectional isobaric sealing of the oil well pipe 26, balance the forces at both ends of the sealing mechanism, and keep the sealing mechanism from sliding at the position where the two sections of the oil well pipe 26 are connected.

[0033] The universal joint assembly includes two adapter brackets and a connecting ring 21. The two adapter brackets are a left-turning bracket ring 19 and a right-turning bracket ring 20. The left-turning bracket ring 19 is rotatably installed at one end of the connecting ring 21, and the right-turning bracket ring 20 is rotatably installed at the other end of the connecting ring 21. The rotation axis line of the left-turning bracket ring 19 is perpendicular to the rotation axis line of the right-turning bracket ring 20. A peek seal body is connected to the ends of the left-turning bracket ring 19 and the right-turning bracket ring 20 that are away from the connecting ring 21. An adjusting assembly is also provided at the ends of the left-turning bracket ring 19 and the right-turning bracket ring 20 that are away from the connecting ring 21. A rubber tube 15 is provided on the inner ring of the connecting ring 21. The ports at both ends of the rubber tube 15 are connected to the outer ports of the two peek seal bodies. When there is a bending angle at the connection of the oil well pipe 26, through the rotation adjustment between the left-turning bracket ring 19, the right-turning bracket ring 20 and the connecting ring 21, the axes of the left seal body 16 and the right seal body 17 are made to coincide with the two oil well pipes 26 to be sealed and connected. That is, the entire circumference of the four V-shaped sealing rings 18 can contact the inner wall of the oil well pipe 26, and the degree of contact is the same, avoiding the sealing device being deformed by bending, resulting in uneven contact between the sealing ring and the pipe wall, and causing the mining pressure of the entire oil well to decrease.

[0034] Each set of adjusting assemblies includes an internally threaded fixed ring 22, a gear 24, an angle motor 25, and several screw-connecting arms. The internally threaded fixed ring 22 is rotatably arranged at the ends of the left-turning bracket ring 19 and the right-turning bracket ring 20 that are connected to the peek seal body. Two gears 24 and two angle motors 25 are arranged inside the left-turning bracket ring 19 and the right-turning bracket ring 20. The gear 24 is arranged on the motor shaft of the angle motor 25. A thread groove is provided on the inner ring of the internally threaded fixed ring 22, and a tooth groove is provided on the outer ring of the internally threaded fixed ring 22. The tooth groove meshes with the gear 24 for transmission. Three screw-connecting arms are provided on each of the two layers of peek seal bodies. The outermost layer of peek seal body is provided with a long screw-connecting arm 232, and the inner ring of the middle layer of peek seal body is provided with a short screw-connecting arm 231. A thread guiding groove is provided on the screw-connecting arm, and the thread guiding groove cooperates with the thread groove. After the sealing device is positioned, the installation positioning mechanism supplies current to the two angle motors 25. The angle motor 25 drives the gear 24 to rotate, and the gear 24 then drives the internally threaded fixed ring 22 to rotate, moving the two layers of peek seal bodies of the long screw-connecting arm 232 and the short screw-connecting arm 231 that cooperate with the internally threaded fixed ring 22. When the gap between each layer of peek seal body becomes smaller, the V-shaped sealing ring 18 is extruded and extends outwards. The extended part contacts the pipe wall of the oil well pipe 26 to seal the oil well pipe 26. Since the degree of outward extension of the V-shaped sealing ring 18 due to pressure can be adjusted by the internally threaded fixed ring 22, the V-shaped sealing ring 18 of this sealing device is suitable for sealing two oil well pipes 26 with different inner wall diameters. After sealing, the oil and gas flow through the rubber tube 15.

[0035] The installation and positioning mechanism includes a guide 1, a flexible shaft 13, and a head seat 14. The flexible shaft 13 is sleeved in a rubber tube 15. The guide 1 is arranged on one side of the flexible shaft 13 close to the left turntable ring 19. A locking assembly is arranged inside the guide 1. The head seat 14 is arranged on one side of the flexible shaft 13 close to the right turntable ring 20. A positioning assembly is arranged inside the head seat 14. A hydraulic circuit is arranged inside the guide 1. A hydraulic groove is formed in the flexible shaft 13 at one end close to the guide 1, and the hydraulic groove is communicated with the hydraulic circuit. The locking assembly includes three clamping pins 2 and a piston 3. The three clamping pins 2 are slidably arranged in the hydraulic circuit. The piston 3 is slidably installed in the hydraulic groove. A piston spring 4 is arranged between the piston 3 and the flexible shaft 13. A servo motor 6 is arranged in the flexible shaft 13. A cam 5 is installed on the motor shaft of the servo motor 6. The cam 5 is in contact with the piston 3. A plurality of arc-shaped chutes are formed inside the head seat 14. An empty groove is formed in the flexible shaft 13 at one end close to the head seat 14, and the plurality of arc-shaped chutes are communicated with the empty groove. A pressure sensor 12 is arranged between the head seat 14 and the flexible shaft 13. The positioning assembly includes a pair of magnetic chucks 10. The pair of magnetic chucks 10 are slidably installed in the arc-shaped chutes. A winding motor 8 is arranged in the empty groove. A rope drum 7 is installed on the motor shaft of the winding motor 8. Two tension ropes 9 are wound on the rope drum 7. One ends of the two tension ropes 9 are respectively connected with the pair of magnetic chucks 10 through guide wheels. A magnetic head spring 11 is arranged between each magnetic chuck 10 and the head seat 14;

[0036] When the installation and positioning mechanism moves, the magnetic chuck 10 moves in the oil well pipe 26. The magnetic lines of force of the magnetic chuck 10 pass through the pipe wall of the oil well pipe 26, forming an induced current in the pipe wall. The induced current generates a new magnetic field opposite to the magnetic field direction of the magnetic chuck 10, hindering the movement of the magnetic chuck 10. When the magnetic chuck 10 passes through the position where two sections of oil well pipes are connected, the induced current in the pipe wall is interrupted, and the resistance received by the magnetic chuck 10 becomes smaller. The pressure sensor 12 detects the change in pressure. The servo motor 6 drives the cam 5 to rotate. The cam 5 pushes the piston 3. During the period when the servo motor 6 responds, the installation and positioning mechanism is still moving. The piston 3 moves to push out all the clamping pins 2 through the hydraulic circuit. The clamping pins 2 contact and tighten against the inner wall of the oil well pipe 26, making the installation and positioning mechanism unable to move forward. The sealing mechanism is just between two sections of oil well pipes 26. Then, power is supplied to the two angle motors 25 through the installation and positioning mechanism, and the sealing mechanism seals and locks the oil well pipe 26. When it is necessary to retract the clamping pins 2, the servo motor 6 drives the cam 5 to rotate again. The piston 3 resets under the action of the piston spring 4, and the clamping pins 2 retract into the guide 1. At the same time, current is introduced into the winding motor 8. The winding motor 8 drives the rope drum 7 to rotate and wind the two tension ropes 9. The magnetic chucks 10 retract into the head seat 14, and the installation and positioning mechanism is taken out through the guide cable.

[0037] Working principle of the present invention: When using this sealing device, the worker sleevs the sealing mechanism on the installation positioning mechanism and guides the installation positioning mechanism to move in the oil well pipe 26 through the guiding cable.

[0038] When the installation positioning mechanism moves, the magnetic chuck 10 moves in the oil well pipe 26. The magnetic lines of force of the magnetic chuck 10 pass through the pipe wall of the oil well pipe 26, forming an induced current in the pipe wall. The induced current generates a new magnetic field that is opposite to the magnetic field direction of the magnetic chuck 10, hindering the movement of the magnetic chuck 10. When the magnetic chuck 10 passes through the position where two sections of the oil well pipe 26 are joined, the induced current in the pipe wall is interrupted, and the resistance received by the magnetic chuck 10 becomes smaller. The pressure sensor 12 detects the change in pressure, and the control system is used to make the servo motor 6 drive the cam 5 to rotate. The cam 5 pushes the piston 3. During the period when the servo motor 6 responds, the installation positioning mechanism is still moving. The piston 3 moves to eject all the clamping pins 2 through the hydraulic circuit. The clamping pins 2 contact and press against the inner wall of the oil well pipe 26, making the installation positioning mechanism unable to move further, so that the sealing mechanism is exactly between two sections of the oil well pipe 26. The installation positioning mechanism supplies current to the two angle motors 25. The angle motors 25 drive the gears 24 to rotate. The gears 24 then drive the internally threaded fixed ring 22 to rotate. The short screw connecting arm 231 and the long screw connecting arm 232 that cooperate with the internally threaded fixed ring 22 drive the two layers of peek sealing bodies to move. When the gap between the two layers of peek sealing bodies becomes smaller, the V-shaped sealing ring 18 is squeezed and extends outwards. The extended part contacts the pipe wall of the oil well pipe 26 to seal the oil well pipe 26. Since the degree of the V-shaped sealing ring 18 being pressed and extending outwards can be adjusted by the internally threaded fixed ring 22, the V-shaped sealing ring 18 of this sealing device is suitable for sealing two oil well pipes 26 with different inner wall diameters. After the sealing is completed, the oil and gas flow through the rubber pipe 15.

[0039] When it is necessary to retract the clamping pins 2, the servo motor 6 drives the cam 5 to rotate again. The piston 3 resets under the action of the piston spring 4. The clamping pins 2 retract into the guide 1. At the same time, current is supplied to the winding motor 8. The winding motor 8 drives the drum 7 to rotate and wind the two tension ropes 9. The magnetic chuck 10 retracts into the magnetic head seat 14. Finally, the worker removes the installation positioning mechanism through the guiding cable.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0041] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A peek equal-pressure bi-directional sealing device for a well completion tool, at least including two sections preset in an underground oil well pipe (26), characterized in that: The device includes an installation and positioning mechanism and a sealing mechanism. The sealing mechanism is installed in the oil well pipe (26), and the installation and positioning mechanism is sleeved in the sealing mechanism. The installation and positioning mechanism is electrically connected to the sealing mechanism. The sealing mechanism connects and seals two sections of the oil well pipe (26), and the installation and positioning mechanism positions and installs the sealing mechanism; The sealing mechanism includes a universal joint assembly. A set of adjusting components are arranged at both ends of the universal joint assembly. A sealing ring is connected to each set of the adjusting components. The universal joint assembly enables the sealing mechanism to adapt to the angle of two sections of the oil well pipe (26). The adjusting components adjust the length of the sealing ring. The sealing ring contacts the oil well pipe (26), and the sealing ring seals the oil well pipe (26); Each sealing ring includes a peek sealing body and a V-shaped sealing ring (18). A pair of peek sealing bodies are installed at both ends of the universal joint assembly. Multiple layers of V-shaped sealing rings (18) are arranged between each pair of peek sealing bodies. The multiple layers of V-shaped sealing rings (18) are evenly arranged in the peek sealing body. The directions of the V-shaped openings of the multiple layers of V-shaped sealing rings (18) are the same. The direction of the V-shaped opening faces one end of the universal joint assembly, and the end of the V-shaped pointed bottom faces outward; The universal joint assembly includes two adapter brackets and a connecting ring (21). The two adapter brackets are a left-turning bracket ring (19) and a right-turning bracket ring (20). The left-turning bracket ring (19) is rotatably installed at one end of the connecting ring (21), and the right-turning bracket ring (20) is rotatably installed at the other end of the connecting ring (21). The rotation axis line of the left-turning bracket ring (19) is perpendicular to the rotation axis line of the right-turning bracket ring (20). The ends of the left-turning bracket ring (19) and the right-turning bracket ring (20) far from the connecting ring (21) are connected with peek sealing bodies. The ends of the left-turning bracket ring (19) and the right-turning bracket ring (20) far from the connecting ring (21) are also provided with adjusting components. A rubber tube (15) is arranged on the inner ring of the connecting ring (21). The ports at both ends of the rubber tube (15) are connected to the outer ports of the two peek sealing bodies; The installation and positioning mechanism includes a guide (1), a flexible shaft (13), and a magnetic head seat (14). A positioning component is arranged in the magnetic head seat (14); A number of arc-shaped chutes are opened in the magnetic head seat (14). An empty slot is opened in the flexible shaft (13) near one end of the magnetic head seat (14). The number of arc-shaped chutes is communicated with the empty slot. A pressure sensor (12) is arranged between the magnetic head seat (14) and the flexible shaft (13). The positioning component at least includes a pair of magnetic chucks (10). At least a pair of magnetic chucks (10) are slidably installed in the arc-shaped chutes. A winding motor (8) is arranged in the empty slot. A rope drum (7) is installed on the motor shaft of the winding motor (8). At least two pulling ropes (9) are wound on the rope drum (7). One ends of at least the two pulling ropes (9) are connected to a pair of magnetic chucks (10) through guide wheels. A magnetic head spring (11) is arranged between each magnetic chuck (10) and the magnetic head seat (14).

2. The peek equal-pressure bi-directional sealing device for a completion tool according to claim 1, characterized in that: Each set of the adjusting components includes an internally threaded fixed ring (22), a gear (24), an angle motor (25), and a plurality of screwed arms. The internally threaded fixed ring (22) is rotatably arranged at one end of the left turning frame ring (19) and the right turning frame ring (20) connected to the peek seal body. Two of the gears (24) and two angle motors (25) are arranged inside the left turning frame ring (19) and the right turning frame ring (20). The gear (24) is arranged on the motor shaft of the angle motor (25). A thread groove is formed on the inner ring of the internally threaded fixed ring (22), and a tooth groove is arranged on the outer ring of the internally threaded fixed ring (22). The tooth groove is in meshing transmission with the gear (24). At least three screwed arms are arranged on each layer of the peek seal body. A thread guiding groove is formed on the screwed arm, and the thread guiding groove is matched with the thread groove. The length of the screwed arm changes with the distance between each layer of the peek seal body and the left turning frame ring (19) or the right turning frame ring (20).

3. The isobaric bi-directional sealing device made of PEEK for a completion tool according to claim 2, characterized in that: The flexible shaft (13) is sleeved in the rubber tube (15). The guide (1) is arranged on one side of the flexible shaft (13) close to the left turning frame ring (19). A locking component is arranged inside the guide (1). The magnetic head seat (14) is arranged on one side of the flexible shaft (13) close to the right turning frame ring (20).

4. A PEEK isobaric bi-directional sealing device for a completion tool according to claim 3, characterized in that: A hydraulic circuit is arranged inside the guide (1). A hydraulic groove is formed in the flexible shaft (13) close to one end of the guide (1). The hydraulic groove is communicated with the hydraulic circuit. The locking component at least includes a pair of clamping pins (2) and a piston (3). At least one pair of the clamping pins (2) is slidably arranged in the hydraulic circuit. The piston (3) is slidably installed in the hydraulic groove. A piston spring (4) is arranged between the piston (3) and the flexible shaft (13). A servo motor (6) is arranged in the flexible shaft (13). A cam (5) is installed on the motor shaft of the servo motor (6). The cam (5) is in contact with the piston (3).

5. The peek equal-pressure bi-directional sealing device for a completion tool according to claim 1, characterized in that: A pair of the peek seal bodies are divided into a left seal body (16) and a right seal body (17). The left seal body (16) is connected to the left turning frame ring (19), and the right seal body (17) is connected to the right turning frame ring (20).

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