Cable limiting mechanism and cable limiting method suitable for electric submersible pump system

Abstract

The application provides a cable limiting mechanism and a cable limiting method suitable for an electric submersible pump system, wherein the cable limiting mechanism comprises a positioning member, a fixing ring, a plurality of binding members, a butt joint member and a winding member; the positioning member is matched with a cable joint to limit part of the cable between the oil pipe and the motor; the fixing ring is rotationally connected with a transmission ring, and the transmission ring is connected with a rotary driving member; the butt joint member and the transmission ring have a synchronous structure. When the cable on the upper end passes through one of the binding members and is connected with the butt joint member, the rotary transmission ring can make the cable wind on the oil pipe or separate from the oil pipe, so as to avoid the friction between the cable and the wellhead when the oil pipe is placed into the oil well, and ensure that the cable does not rub against the wellhead when the cable extends out of the oil well by positioning the binding member to the wellhead. The cable limiting mechanism and the cable limiting method suitable for the electric submersible pump system can effectively protect the cable and ensure the stable operation of the electric submersible pump system.

Description

Technical Field

[0001] This application belongs to the field of submersible electric pump technology, specifically relating to a cable limiting mechanism and cable limiting method suitable for submersible electric pump systems. Background Technology

[0002] Submersible electric pumps, also known as electric submersible pumps or submersible electric centrifugal pumps, are rodless oil pumps used in mechanical oil extraction. Their structure mainly consists of four components: an electric motor, a protector, a separator, and a centrifugal pump. Submersible electric pump systems refer to operating systems equipped with submersible electric pumps for automated oil extraction. They are characterized by a large displacement and head range, high operating power, strong environmental adaptability, simple surface process flow, and long unit service life.

[0003] In existing technologies, common submersible electric pump (FET) systems include an FET unit, surface electrical equipment, and cables. During system operation, the FET unit is lowered into the wellhead. Under a certain submerged pressure, the electric motor drives a centrifugal pump to rotate at high speed. Simultaneously, the oil flow in the well passes through a separator to remove some free gas before entering a multi-stage centrifugal pump. The oil flow is pressurized in multiple stages by the multi-stage centrifugal pump to create sufficient head, and then lifted to the surface through tubing, achieving the technical objective of automated oil production. During the operation of the FET system, the surface electrical equipment is connected to the FET unit via cables, with the upper and lower ends of the cable located inside and outside the well, respectively. The connection between the lower end of the cable and the FET unit is performed before the FET unit is placed into the well.

[0004] The inventors discovered that during the process of gradually lowering the submersible electric pump unit into the oil well, the lower end of the cable descends synchronously with the submersible electric pump unit, and the main body of the cable continuously moves horizontally from outside the well and extends into the well. At the same time, because the upper end of the submersible electric pump unit is connected to a vertically arranged oil pipe, the space above the wellhead is already occupied, making it impossible to limit the cable's movement. These two factors cause the cable to rub against the wellhead for a long time, resulting in damage to the cable sheath and even accidental cable breakage, affecting the stability of the submersible electric pump system. Summary of the Invention

[0005] This application provides a cable limiting mechanism and cable limiting method for submersible electric pump systems, which aims to effectively limit the cable of the submersible electric pump system, prevent it from contacting the oil well, and ensure the stable operation of the submersible electric pump system.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A cable limiting mechanism suitable for a submersible electric pump system is provided, comprising:

[0008] A positioning component is used to fix the lower end of the oil pipe and is used to connect with the cable to fit the cable joint and limit the portion of the cable between the oil pipe and the motor.

[0009] A retaining ring is used to be fitted around the outer periphery of the oil pipe, with its inner ring surface connected to the outer peripheral wall of the oil pipe and positioned above the positioning member; the retaining ring has a transmission ring coaxially arranged and rotatably connected to it, and the transmission ring is connected to a rotation drive member;

[0010] Multiple cable positioning components are distributed at intervals along the circumference of the transmission ring, and each of them is fixedly connected to the outer peripheral wall of the transmission ring; each cable positioning component is used to allow a cable of the corresponding specification to pass through from top to bottom, and to place the cable outside the oil pipe.

[0011] A docking member, for slidingly connecting to the outer peripheral wall of the oil pipe along its circumference, and having a synchronization structure with the drive ring; the docking member is positioned above the clamping member and is used for fixed connection to the upper end of the cable; and

[0012] A winding member is used to fix the cable to the ground outside the well and is used to connect to the upper end of the cable to pull the cable outward.

[0013] When the cable passes through one of the bundle members and its upper end is connected to the docking member, the rotation drive member drives the transmission ring to rotate, which enables the cable to wrap around the outer peripheral wall of the tubing, so as to avoid friction between the cable and the wellhead during the process of inserting the tubing into the well.

[0014] When the tubing is inserted into the well, the drive ring is reversed again by the rotation drive component, which can cause part of the cable between the positioning component and the fixing ring to detach from the tubing.

[0015] After the cable is detached from the tubing, the docking member and the cable are separated, and the upper end of the cable is connected to the winding member. The cable can then be pulled out of the well by the winding member. During this process, the bundling member is flush with the wellhead to avoid friction between the cable and the wellhead.

[0016] In one possible implementation, the positioning component includes:

[0017] An annular seat is used to fix the oil pipe to the outer circumference, and it is coaxial with the oil pipe.

[0018] A combined ring is used to be fitted around the outer periphery of the oil pipe and is connected to the annular seat via a braking structure; the outer peripheral wall of the combined ring has an extension arm extending radially outward, and the side of the extension arm has a plurality of first limiting grooves spaced apart along its own extension direction, and each first limiting groove penetrates the extension arm in the vertical direction; and

[0019] A portal frame, detachably connected to the extension end of the extension arm, is adapted to close multiple first limiting slots; the closing surface of the portal frame has multiple second limiting slots, and each second limiting slot passes through the portal frame in the vertical direction.

[0020] When the gantry frame is connected to the extension arm, the multiple second limiting grooves are connected to the multiple first limiting grooves in a one-to-one correspondence; the interconnected second limiting grooves and first limiting grooves are used to allow cables of corresponding specifications to pass through, and the bottom of the first limiting groove and the bottom of the second limiting groove simultaneously abut against the cable.

[0021] In one possible implementation, the damping structure includes:

[0022] Multiple actuating plates are fixedly connected to the upper surface of the annular seat and are spaced apart circumferentially along the annular seat; and

[0023] Multiple slots are provided on the lower end face of the combined ring to accommodate the insertion of multiple actuating pieces one by one.

[0024] When multiple actuating plates are inserted into multiple slots, both the second limiting slot and the first limiting slot are directly above the cable connector; at the same time, the side of the actuating plate abuts against the side of the slot to restrict the rotation of the combined ring relative to the annular seat.

[0025] In one possible implementation, the rotation drive component includes:

[0026] An internal gear is fixedly connected to the upper end face of the transmission ring and is coaxially arranged with the transmission ring; and

[0027] The first rotating motor is fixedly connected to the outer peripheral wall of the oil pipe and is positioned above the internal gear.

[0028] The first rotating motor has a power output axis that is parallel to the vertical direction, and its lower end is connected to a transmission gear that meshes with the internal gear. When the first rotating motor starts, the transmission gear drives the internal gear to rotate, thereby causing the transmission ring to rotate.

[0029] In one possible implementation, the beam position member includes:

[0030] The support rod has one end fixedly connected to the outer peripheral wall of the transmission ring, and the other end extends outward along the radial direction of the transmission ring, with an inner baffle at the extended end.

[0031] Two fixed shafts are arranged side-by-side horizontally on the inner baffle, and their axial directions are both parallel to the support rod; one end of each fixed shaft is fixedly connected to the inner baffle; and

[0032] The outer baffle is fixedly connected to the other end of the two fixed shafts to cooperate with the inner baffle to limit the range of movement of the cable along the axial direction of the fixed shafts;

[0033] Each of the fixed shafts is rotatably fitted with a guide wheel, the cable is adapted to pass between the two fixed shafts, and the outer walls of the two guide wheels simultaneously abut against the outer wall of the cable.

[0034] In one possible implementation, the synchronization structure includes:

[0035] Multiple protrusions are spaced apart circumferentially on the outer peripheral wall of the transmission ring, and each protrudes in a corresponding manner to one of the multiple support rods; and

[0036] Two side clamps are respectively set on both sides of the docking member, and their length direction is parallel to the vertical direction;

[0037] Each of the side clamps has a rubber block extending toward the space between the two side clamps at its lower end, and the rubber block is adapted to abut against the side of the protrusion so that the two side clamps abut against the two sides of the protrusion respectively; when the transmission ring rotates, the protrusion drives the docking member to rotate synchronously around the oil pipe as an axis through the side clamps.

[0038] In one possible implementation, the docking member includes:

[0039] A ring-shaped seat is used for sliding connection with an oil pipe via an annular guide rail, with the sliding direction being the circumference of the oil pipe. The ring-shaped seat has multiple through holes arranged side-by-side in a vertical direction, each through hole for a cable of a corresponding specification to pass through. Furthermore, the outer surface of the ring-shaped seat has multiple positioning holes that correspond one-to-one with the multiple through holes.

[0040] A fixed frame is fixedly connected to the ring seat, and a transmission component is slidably connected to it along the radial direction of the ring guide rail. The transmission component has multiple docking arms that are inserted into multiple positioning holes in a one-to-one correspondence.

[0041] The fixed frame and the transmission component have an adjustable distance structure, which allows the transmission component to move toward or away from the annular seat so that each docking arm can be inserted into the corresponding through hole and abut against and limit the cable end in the through hole.

[0042] In one possible implementation, the adjustment structure includes:

[0043] A fixing nut is fixedly connected to the fixing frame, and its axial direction is parallel to the sliding direction of the transmission component; and

[0044] An adjusting screw is threadedly connected to the fixing nut, and one end of the screw is rotatably connected to the transmission component.

[0045] When the adjusting screw rotates, it can translate relative to the fixed nut to push or pull the transmission component toward or away from the annular seat.

[0046] In one possible implementation, the winding member includes:

[0047] A fixed base for fixing to the ground has a guide cavity extending in a horizontal direction; the guide cavity has a bidirectional screw, both ends of which are rotatably connected to the fixed base, and one end of which is drivenly connected to a second rotating motor.

[0048] A sliding seat is slidably connected in the guide cavity in the horizontal direction, and its bottom surface has multiple rollers and a mating part that is threadedly connected to the bidirectional screw; when the second rotary motor drives the bidirectional screw to rotate, the mating part reciprocates in the horizontal direction, thereby driving the sliding seat to reciprocate in the horizontal direction; and

[0049] The winding drum is rotatably connected to the upper surface of the sliding seat, its axial direction is parallel to the sliding direction of the sliding seat, and one end of it is drivenly connected to a third rotating motor.

[0050] The take-up drum is used to connect to the upper end of the cable. When the take-up drum is connected to the cable, the third rotary motor can drive the take-up drum to rotate so that the cable is wound on the take-up drum. At the same time, the combination structure of the second rotary motor and the bidirectional screw drives the sliding seat to move back and forth, so that the cable can be wound in an orderly manner.

[0051] In this embodiment, the positioning component and the cable connector pre-installed on the motor housing cooperate to limit the portion of the cable between the tubing and the motor, thereby keeping this portion of the cable taut vertically. Subsequently, the cable is passed through one of the clamping components and its upper end is connected to the docking component. Activating the rotation drive component causes the transmission ring to rotate, thus wrapping the cable around the outer wall of the tubing. During this process, manual intervention can prevent the cable from overlapping on the tubing surface. Simultaneously, the docking component rotates under the action of the synchronization structure, preventing the cable from wrapping around the portion of the tubing above the clamping component. With the portion of the cable below the positioning component taut, the portion between the positioning and clamping components wrapped around the tubing, and the portion between the clamping and docking components taut, inserting the submersible pump into the well prevents the cable from contacting the wellhead, thus avoiding damage to the cable.

[0052] When the tubing is inserted into the well to the point where the positioning component is flush with the wellhead (in most cases, this corresponds to the fixed position of the submersible electric pump system; however, in special cases, the tubing may need to continue downwards a further distance), the insertion of the tubing is stopped and the rotation drive component is activated, causing the drive ring to rotate in the opposite direction to detach part of the cable between the positioning component and the positioning component from the tubing surface. After the part of the cable between the positioning component and the positioning component detaches from the tubing surface, the docking component and the upper end of the cable are separated, and the upper end of the cable is connected to the winding component. This allows the cable to be pulled from bottom to top to wind it up onto the winding component, ensuring its application in surface electrical equipment. During this process, because the positioning component is flush with the wellhead, the cable will not come into contact with the wellhead, thus ensuring that the cable will not be damaged.

[0053] The cable limiting mechanism for submersible electric pump systems provided in this embodiment can effectively limit the cable of the submersible electric pump system compared with the prior art, thereby avoiding friction with the wellhead during the process of the cable penetrating the oil well, thus preventing damage to the cable and ensuring the stable operation of the submersible electric pump system.

[0054] The technical solution adopted in this application also provides a cable limiting method suitable for submersible electric pump systems. Based on the cable limiting mechanism for submersible electric pump systems proposed in any of the foregoing claims, the steps include:

[0055] A. When connecting the oil pipe to the submersible electric pump and connecting the lower end of the cable to the motor, the cable is connected through the positioning member so that the portion of the cable between the oil pipe and the motor is in a taut state;

[0056] B. Pass the cable through the corresponding specification of the bundle member and connect its upper end to the docking member;

[0057] C. Activate the rotation drive component to make the transmission ring rotate; simultaneously, the synchronization structure drives the docking component to rotate synchronously, so that the cable is wound around the outer circumference of the oil pipe;

[0058] D. Insert the submersible electric pump system into the well until the mounting component is flush with the wellhead;

[0059] E. Activate the rotation drive component to cause the transmission ring to rotate in the opposite direction; simultaneously, the synchronization structure drives the docking component to rotate synchronously, causing the cable to detach from the outer periphery of the oil pipe; and

[0060] F. Separate the docking member from the upper end of the cable, and then connect the upper end of the cable to the winding member so that the cable can be pulled out by the winding member.

[0061] The beneficial effects of the cable limiting method for submersible electric pump systems provided in this embodiment are the same as those of the cable limiting mechanism for submersible electric pump systems described above, and will not be repeated here. Attached Figure Description

[0062] Figure 1 A three-dimensional structural schematic diagram of a cable limiting mechanism for a submersible electric pump system provided in an embodiment of this application;

[0063] Figure 2 for Figure 1 A magnified view of a portion of the upper circle at point A;

[0064] Figure 3 for Figure 1 A magnified view of a portion of the upper circle at point B;

[0065] Figure 4 This is an exploded view of the positioning component used in the embodiments of this application;

[0066] Figure 5 This is an exploded view of the combined ring and gantry frame used in the embodiments of this application;

[0067] Figure 6 This is a schematic diagram of the combined structure of the fixed ring and the transmission ring used in the embodiments of this application;

[0068] Figure 7 This is an exploded view of the beam positioning component used in the embodiments of this application;

[0069] Figure 8 This is an exploded view of the docking components used in the embodiments of this application;

[0070] Figure 9 This is a partially enlarged schematic diagram of the combined structure between the ring-shaped seat and the ring-shaped guide rail used in the embodiments of this application;

[0071] Figure 10 This is a three-dimensional structural diagram of the winding component used in the embodiments of this application;

[0072] Figure 11 This is a three-dimensional structural diagram of the sliding seat used in the embodiments of this application;

[0073] Figure 12 This is a three-dimensional structural diagram of the fixing base used in the embodiments of this application;

[0074] Explanation of reference numerals in the attached drawings: 1. Positioning component; 11. Annular seat; 12. Combined ring; 121. Extension arm; 122. First limiting groove; 13. Portal frame; 131. Second limiting groove; 2. Fixed ring; 3. Transmission ring; 31. Rotation drive component; 311. Internal gear; 312. First rotating motor; 3121. Transmission gear; 4. Beam component; 41. Support rod; 411. Inner baffle; 42. Fixed shaft; 421. Guide wheel; 43. Outer baffle; 5. Connecting component; 51. Circular seat; 511. Through hole; 512. Positioning hole; 5 13. Circular guide rail; 52. Fixing frame; 521. Transmission component; 5211. Connecting arm; 6. Synchronization structure; 61. Protrusion; 62. Side clamp; 621. Rubber block; 7. Rewinding component; 71. Fixing seat; 711. Guide cavity; 712. Bidirectional screw; 713. Second rotating motor; 72. Sliding seat; 721. Roller; 722. Mating part; 73. Rewinding drum; 731. Third rotating motor; 8. Braking structure; 81. Braking plate; 82. Slot; 9. Adjusting structure; 91. Fixing nut; 92. Adjusting screw. Detailed Implementation

[0075] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0076] Please refer to the following: Figures 1 to 12 The cable limiting mechanism for submersible electric pump systems provided in this application will now be described. The cable limiting mechanism for submersible electric pump systems proposed in this application includes a positioning component 1, a fixing ring 2, multiple bundling components 4, a docking component 5, and a winding component 7.

[0077] Positioning component 1 is used to fix the lower end of the oil pipe, that is, at the position where the oil pipe is connected to the submersible electric pump unit; and this positioning component 1 is used to connect with the cable to cooperate with the cable joint (fixed to the submersible electric pump unit) to limit the part of the cable between the oil pipe and the motor. Specifically, the connection position of positioning component 1 and the cable is directly above the cable joint, so that the part of the cable between the cable joint and positioning component 1 is in a vertical taut state.

[0078] The fixing ring 2 is coaxially fitted around the outer circumference of the oil pipe, with its inner ring surface connected to the outer circumferential wall of the oil pipe. The connection method can be welding. In this embodiment, the fixing ring 2 is positioned above the positioning member 1 and close to the upper end of the oil pipe. The fixing ring 2 has a transmission ring 3 coaxially arranged and rotatably connected to it. Specifically, the transmission ring 3 is supported on the upper end face of the fixing ring 2 and is also fitted around the outer circumference of the oil pipe. This transmission ring 3 is also connected to a rotation drive member 31, which drives the transmission ring 3 to rotate relative to the fixing ring 2, thereby achieving rotation of the transmission ring 3 relative to the oil pipe.

[0079] Multiple positioning components 4 are distributed circumferentially along the transmission ring 3, and each is fixedly connected to the outer peripheral wall of the transmission ring 3. In actual use, each positioning component 4 is used to allow a cable of the corresponding specification to pass through from top to bottom, with the cable positioned outside the oil pipe. When the oil pipe is in a vertical position and one of the positioning components 4 is connected to the cable, the transmission ring 3 drives the positioning component 4 to rotate around the oil pipe as an axis, which can cause the cable to wrap around the oil pipe or separate from the oil pipe. It should be noted that the reason for designing multiple sets of positioning components 4 is that the cables associated with common submersible electric pump units have various specifications, and each set of positioning components 4 corresponds to a different cable specification.

[0080] The docking member 5 is slidably connected to the outer circumferential wall of the oil pipe along its circumference, and has a synchronization structure 6 between it and the transmission ring 3. In this embodiment, the rotation of the transmission ring 3 and the translation of the docking member 5 around the oil pipe can be synchronized by this synchronization structure 6. Furthermore, in this configuration, the docking member 5 is positioned above the clamping member 4 and is used to fix it to the upper end of the cable, thereby straightening the portion of the cable between the docking member 5 and the clamping member 4. It should be noted that the synchronization structure 6 can be removed from between the transmission ring 3 and the docking member 5 to ensure that the docking member 5 can move directly above the clamping member 4 connected to the cable.

[0081] The winding member 7 is used to fix the cable to the ground outside the well and is used to connect to the upper end of the cable to pull the cable outward. It should be noted that when the winding member 7 is connected to the upper end of the cable, the upper end of the cable is separated from the docking member 5. That is to say, in this embodiment, the upper end of the cable can be fixed to the tubing by connecting the docking member 5 and the upper end of the cable; and the upper end of the cable can also be kept outside the well by connecting the winding member 7 and the upper end of the cable.

[0082] When the cable passes through one of the bundle members 4 and its upper end is connected to the docking member 5, the transmission ring 3 is rotated by the rotation drive member 31, which can make the cable wrap around the outer wall of the tubing, so as to avoid friction between the cable and the wellhead during the process of the tubing being inserted into the well.

[0083] When the tubing is inserted into the well, the drive ring 3 is rotated again by rotating the drive component 31, which causes the part of the cable between the positioning component 1 and the fixing ring 2 to detach from the tubing.

[0084] After the cable is disconnected from the tubing, the disconnecting component 5 and the cable are separated, and the upper end of the cable is connected to the winding component 7. The cable can then be pulled out of the well by the winding component 7. During this process, the bundling component 4 is in a position flush with the wellhead, which can prevent the cable from rubbing against the wellhead.

[0085] After the cable detaches from the oil pipe, if the oil pipe needs to be moved further downwards, the cable can be separated from the winding member 7 by reversing the operation, thus avoiding the movement of the oil pipe pulling on the cable. In actual operation, after the above steps, the oil pipe has basically reached the required fixed position, so its downward movement range is limited. Therefore, in normal operation, it is not necessary to reverse the operation of the winding member 7; the cable can be pulled out by the traction force of the cable moving downwards.

[0086] In this embodiment, the positioning member 1 and the cable connector pre-installed on the motor housing cooperate to limit the cable between the tubing and the motor, thus keeping this portion of the cable taut vertically. Subsequently, the cable is passed through one of the clamping members 4 and its upper end is connected to the docking member 5. Activating the rotation drive member 31 causes the transmission ring 3 to rotate, thereby wrapping the cable around the outer wall of the tubing. During this process, manual intervention can prevent the cable from overlapping on the tubing surface. Simultaneously, the docking member 5 rotates under the action of the synchronization structure 6, preventing the cable from wrapping around the portion of the tubing above the clamping member 4. When the portion of the cable below the positioning member 1 is taut, the portion of the cable between the positioning member 1 and the clamping member 4 is wrapped around the tubing, and the portion of the cable between the clamping member 4 and the docking member 5 is taut, inserting the submersible pump into the well prevents the cable from contacting the wellhead, thus avoiding damage to the cable.

[0087] When the tubing is inserted into the well to the position where the positioning component 4 is flush with the wellhead (in most cases, this position corresponds to the fixed position of the submersible electric pump system; however, in special cases, the tubing may need to continue to penetrate further), the insertion of the tubing is stopped and the rotation drive component 31 is activated, causing the transmission ring 3 to rotate in the opposite direction to disengage a portion of the cable between the positioning component 1 and the positioning component 4 from the surface of the tubing. After the portion of the cable between the positioning component 1 and the positioning component 4 is disengaged from the surface of the tubing, the docking component 5 is separated from the upper end of the cable, and the upper end of the cable is connected to the winding component 7. This allows the cable to be pulled from bottom to top and wound onto the winding component 7, ensuring its application in surface electrical equipment. During this process, because the positioning component 4 is flush with the wellhead, the cable will not come into contact with the wellhead, thus ensuring that the cable will not be damaged.

[0088] The cable limiting mechanism for submersible electric pump systems provided in this embodiment can effectively limit the cable of the submersible electric pump system compared with the prior art, thereby avoiding friction with the wellhead during the process of the cable penetrating the oil well, thus preventing damage to the cable and ensuring the stable operation of the submersible electric pump system.

[0089] In some embodiments, such as Figures 3 to 5 As shown, the positioning component 1 includes an annular seat 11, a combined ring 12, and a portal frame 13.

[0090] The annular seat 11 is used to fix the connection to the outer circumference of the oil pipe. Specifically, it can be fixedly connected to the outer wall of the oil pipe by welding, and it is coaxial with the oil pipe.

[0091] The combined ring 12 is fitted around the outer circumference of the oil pipe and is connected to the annular seat 11 via a stop structure 8, which controls the rotation of the combined ring 12 relative to the annular seat 11. The outer peripheral wall of the combined ring 12 has an extension arm 121 extending radially outward. When the combined ring 12 is restricted by the stop structure 8, the horizontal position of this extension arm 121 is fixed and is suitable to be directly above the cable connector. One side of the extension arm 121 facing the circumference of the combined ring 12 has a plurality of first limiting grooves 122. In this embodiment, the plurality of first limiting grooves 122 are spaced apart along the extension direction of the extension arm 121, and each first limiting groove 122 penetrates the extension arm 121 in the vertical direction.

[0092] The gantry frame 13 is detachably connected to the extension end of the extension arm 121, and one side of it is adapted to contact the side where the first limiting groove 122 is located to close the multiple first limiting grooves 122; multiple second limiting grooves 131 are provided on the contact surface between the gantry frame 13 and the extension arm 121, and each second limiting groove 131 passes through the gantry frame 13 in the vertical direction.

[0093] When the gantry frame 13 is connected to the extension arm 121, multiple second limiting grooves 131 are connected to multiple first limiting grooves 122 in a one-to-one correspondence. The interconnected second limiting grooves 131 and first limiting grooves 122 combine to form a circular hole structure, and the cross-sectional area of ​​the circular hole structure at different positions is different, so that it can be used to allow cables of different specifications to pass through. When the cable passes through the above-mentioned circular hole structure, the bottom of the first limiting groove 122 and the bottom of the second limiting groove 131 simultaneously abut against the cable to restrict the cable from moving in the vertical direction, thereby ensuring that the part of the cable between the cable joint and the positioning member 1 is in a taut state.

[0094] In some embodiments, such as Figure 4 As shown, the damping structure 8 includes multiple damping plates 81 and multiple slots 82.

[0095] Multiple actuating plates 81 are fixedly connected to the upper surface of the annular seat 11, and are distributed at intervals along the circumference of the annular seat 11, with each actuating plate 81 extending from bottom to top.

[0096] Multiple slots 82 are provided on the lower end face of the combination ring 12 to accommodate the insertion of multiple actuating plates 81 one by one.

[0097] When multiple stop plates 81 are inserted into multiple slots 82, the combined circular hole of the second limiting groove 131 and the first limiting groove 122 is adapted to be directly above the cable connector to ensure that the cable between the positioning member 1 and the cable connector remains vertically taut; in this state, the side of the stop plate 81 abuts against the side of the slot 82 to restrict the rotation of the combined ring 12 relative to the annular seat 11.

[0098] It should be noted that, in actual design, a locking structure can be added between the actuating plate 81 and the slot 82; however, in this embodiment, the locking structure is not used because the cable wound on the oil pipe provides tension to the combined ring 12 in the direction of upward in the horizontal direction, so there is no need to use a locking structure and it will not affect the structural stability between the combined ring 12 and the ring seat 11 (or, the movement between the combined ring 12 and the ring seat 11 is negligible).

[0099] It should be noted that, in this embodiment, the aforementioned combined ring 12 is composed of two semicircular rings to facilitate its installation and separation relative to the oil pipe; and the extension arm 121 is fixed on one of the semicircular rings.

[0100] In some embodiments, such as Figure 2 and Figure 6 As shown, the rotation drive component 31 includes an internal gear 311 and a first rotation motor 312.

[0101] The internal gear 311 is fixedly connected to the upper end face of the transmission ring 3. The specific connection method can be achieved by a combination of bolts and reserved threaded holes, and the internal gear 311 is coaxially set with the transmission ring 3.

[0102] The first rotating motor 312 is fixedly connected to the outer peripheral wall of the oil pipe, with its power output end extending downwards and its main body positioned above the internal gear 311.

[0103] In this embodiment, the power output end of the first rotating motor 312 is connected to a transmission gear 3121 that meshes with the internal gear 311; when the first rotating motor 312 is started, the transmission gear 3121 drives the internal gear 311 to rotate, so that the transmission ring 3 rotates.

[0104] In some embodiments, such as Figure 6 and Figure 7 As shown, the beam position component 4 includes a support rod 41, two fixed shafts 42 and an outer baffle 43.

[0105] One end of the support rod 41 is fixedly connected to the outer peripheral wall of the transmission ring 3, and the other end extends outward along the radial direction of the transmission ring 3, and its extended end has an inner baffle 411; in this embodiment, in order to improve the structural strength, there are multiple support rods 41 corresponding to a single set of bundle position members 4, and they are arranged side by side in the horizontal direction; there is a single inner baffle 411, and its plate surface facing the transmission ring 3 is connected to the extended ends of multiple support rods 41.

[0106] Two fixed shafts 42 are arranged side by side on the inner baffle 411 in the horizontal direction, and their axial directions are parallel to the axial direction of the support rod 41; one end of the fixed shaft 42 is fixedly connected to the inner baffle 411, and the other end extends outward away from the inner baffle 411.

[0107] The outer baffle 43 is fixedly connected to the extended ends of the two fixed shafts 42 to cooperate with the inner baffle 411 to limit the range of movement of the cable along the axial direction of the fixed shaft 42.

[0108] Each fixed shaft 42 is rotatably fitted with a guide wheel 421, and the cable is adapted to pass between the two fixed shafts 42. The outer walls of the two guide wheels 421 simultaneously abut against the outer wall of the cable to ensure the stability of the cable's vertical movement.

[0109] It should be further noted that when the cable is pulled by the winding member 7, the axial direction of its winding shaft (i.e., the winding drum 73 mentioned below) is adapted to be parallel to the axial direction of the guide wheel 421 (this technical objective can be achieved by changing the fixed position of the winding member 7 or by changing the stop position of the bundle member 4) to ensure the stability of the cable when it moves out of the well.

[0110] In some embodiments, such as Figure 2 , Figure 6 and Figure 8 As shown, the synchronization structure 6 includes multiple protrusions 61 and two side clamps 62.

[0111] Multiple protrusions 61 are distributed at intervals along the circumference of the transmission ring 3 on the outer peripheral wall of the transmission ring 3, and they are connected to multiple support rods 41 in a one-to-one correspondence, so as to realize the positioning connection between the support rods 41 and the outer wall of the transmission ring 3.

[0112] Two side clamps 62 are respectively disposed on both sides of the mating member 5, and their length direction is parallel to the vertical direction; and each side clamp 62 has a rubber block 621 extending toward the space between the two side clamps 62 at its lower end, and the rubber block 621 is adapted to abut against the side of the protrusion 61 so that the two side clamps 62 abut against the two sides of the protrusion 61 respectively.

[0113] By adopting the above technical solution, when the transmission ring 3 rotates, the protrusion 61 drives the docking component 5 to rotate synchronously around the oil pipe via the side clamp 62.

[0114] In some embodiments, such as Figure 8 and Figure 9 As shown, the docking component 5 includes a ring seat 51 and a fixed frame 52.

[0115] The ring seat 51 is used to slide with the oil pipe via the ring guide rail 513, and its sliding direction is the circumferential direction of the oil pipe; the ring seat 51 has a plurality of through holes 511 arranged in parallel along the vertical direction, each through hole 511 is used to allow a cable of the corresponding specification to pass through; and the outer surface of the ring seat 51 has a plurality of positioning holes 512 that correspond one-to-one with the plurality of through holes 511.

[0116] The fixed frame 52 is fixedly connected to the ring seat 51, and a transmission component 521 is slidably connected to it along the radial direction of the ring guide rail 513. The transmission component 521 has multiple docking arms 5211 that are inserted into multiple positioning holes 512 in a one-to-one correspondence.

[0117] In this embodiment, there is an adjustable distance structure 9 between the fixed frame 52 and the transmission member 521. This adjustable distance structure 9 allows the transmission member 521 to move toward or away from the ring seat 51 so that each docking arm 5211 is inserted into the corresponding through hole 511 and abuts against the cable end in the limiting through hole 511, thereby fixing the upper end of the cable.

[0118] In some embodiments, such as Figure 8 As shown, the pitch adjustment structure 9 includes a fixing nut 91 and a pitch adjustment screw 92.

[0119] The fixing nut 91 is fixedly connected to the fixing frame 52, and its axis is parallel to the sliding direction of the transmission component 521; specifically, the fixing nut 91 is connected to the fixing frame 52 through a reserved hole pre-drilled in the fixing frame 52.

[0120] The adjusting screw 92 is threadedly connected to the fixing nut 91. One end of the screw is located outside the fixing bracket 52 and has a handle that extends radially outward. The other end of the screw is rotatably connected to the transmission component 521.

[0121] By adopting the above technical solution, when the adjusting screw 92 rotates, it can translate relative to the fixed nut 91 to push or pull the transmission component 521 toward or away from the ring seat 51.

[0122] In some embodiments, such as Figures 10 to 12 As shown, the winding component 7 includes a fixed seat 71, a sliding seat 72, and a winding drum 73.

[0123] The mounting base 71 is used to fix it on the ground and has a guide cavity 711 extending in the horizontal direction. The guide cavity 711 has a bidirectional screw 712, both ends of which are rotatably connected to the mounting base 71, and one end of which is drivenly connected to a second rotating motor 713.

[0124] The sliding seat 72 is slidably connected to the guide cavity 711 in the horizontal direction, and its bottom surface has multiple rollers 721 and a mating part 722 that is threadedly connected to the bidirectional screw 712; specifically, there are four rollers 721 arranged in a rectangular shape, and the mating part 722 is fixedly connected to the center of the bottom surface of the sliding seat 72. When the second rotary motor 713 drives the bidirectional screw 712 to rotate, the mating part 722 reciprocates in the horizontal direction, thereby driving the sliding seat 72 to reciprocate in the horizontal direction.

[0125] The winding drum 73 is rotatably connected to the upper surface of the sliding seat 72, and its axial direction is parallel to the sliding direction of the sliding seat 72. One end of the drum is connected to a third rotating motor 731.

[0126] In this embodiment, the take-up drum 73 is used to connect to the upper end of the cable. When the take-up drum 73 is connected to the cable, the third rotary motor 731 can drive the take-up drum 73 to rotate, so that the cable can be wound on the take-up drum 73. At the same time, the combination structure of the second rotary motor 713 and the bidirectional screw 712 drives the sliding seat 72 to move back and forth, so that the cable winding can be carried out in an orderly manner.

[0127] Based on the cable limiting mechanism for submersible electric pump systems proposed in any of the foregoing embodiments, this application also provides a cable limiting method for submersible electric pump systems, including the following steps:

[0128] A. When connecting the oil pipe to the submersible electric pump and connecting the lower end of the cable to the motor, the cable is connected by the positioning component 1 so that the part of the cable between the oil pipe and the motor is in a taut state.

[0129] B. Pass the cable through the corresponding specification of the cable tie member 4 and connect its upper end to the docking member 5;

[0130] C. Start the rotation drive component 31 to make the transmission ring 3 rotate; at the same time, the synchronization structure 6 drives the docking component 5 to rotate synchronously so that the cable is wrapped around the outer circumference of the oil pipe;

[0131] D. Insert the submersible electric pump system into the well until the tie-in component 4 is flush with the wellhead;

[0132] E. Activate the rotation drive component 31 to cause the transmission ring 3 to rotate in the opposite direction; simultaneously, the synchronization structure 6 drives the docking component 5 to rotate synchronously, causing the cable to detach from the outer periphery of the oil pipe; and

[0133] F. Separate the docking member 5 from the upper end of the cable, and then connect the upper end of the cable to the winding member 7 so that the cable can be pulled out through the winding member 7.

[0134] The beneficial effects of the cable limiting method for submersible electric pump systems provided in this embodiment are the same as those of the cable limiting mechanism for submersible electric pump systems described above, and will not be repeated here.

[0135] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cable limiting mechanism suitable for submersible electric pump systems, characterized in that, include: A positioning component is used to fix the lower end of the oil pipe and is used to connect with the cable to fit the cable joint and limit the portion of the cable between the oil pipe and the motor. A retaining ring is used to be fitted around the outer periphery of the oil pipe, with its inner ring surface connected to the outer peripheral wall of the oil pipe and positioned above the positioning member; the retaining ring has a transmission ring coaxially arranged and rotatably connected to it, and the transmission ring is connected to a rotation drive member; Multiple cable positioning components are distributed at intervals along the circumference of the transmission ring, and each of them is fixedly connected to the outer peripheral wall of the transmission ring; each cable positioning component is used to allow a cable of the corresponding specification to pass through from top to bottom, and to place the cable outside the oil pipe. A docking member, for slidingly connecting to the outer peripheral wall of the oil pipe along its circumference, and having a synchronization structure with the drive ring; the docking member is positioned above the clamping member and is used for fixed connection to the upper end of the cable; and A winding member is used to fix the cable to the ground outside the well and is used to connect to the upper end of the cable to pull the cable outward. When the cable passes through one of the bundle members and its upper end is connected to the docking member, the rotation drive member drives the transmission ring to rotate, which enables the cable to wrap around the outer peripheral wall of the tubing, so as to avoid friction between the cable and the wellhead during the process of inserting the tubing into the well. When the tubing is inserted into the well, the drive ring is reversed again by the rotation drive component, which can cause part of the cable between the positioning component and the fixing ring to detach from the tubing. After the cable is detached from the tubing, the docking member and the cable are separated, and the upper end of the cable is connected to the winding member. The cable can then be pulled out of the well by the winding member. During this process, the bundling member is flush with the wellhead to avoid friction between the cable and the wellhead.

2. The cable limiting mechanism for a submersible electric pump system as described in claim 1, characterized in that, The positioning component includes: An annular seat is used to fix the oil pipe to the outer circumference, and it is coaxial with the oil pipe. A combined ring is used to be fitted around the outer periphery of the oil pipe and is connected to the annular seat via a braking structure; the outer peripheral wall of the combined ring has an extension arm extending radially outward, and the side of the extension arm has a plurality of first limiting grooves spaced apart along its own extension direction, and each first limiting groove penetrates the extension arm in the vertical direction; and A portal frame, detachably connected to the extension end of the extension arm, is adapted to close multiple first limiting slots; the closing surface of the portal frame has multiple second limiting slots, and each second limiting slot passes through the portal frame in the vertical direction. When the gantry frame is connected to the extension arm, the multiple second limiting grooves are connected to the multiple first limiting grooves in a one-to-one correspondence; the interconnected second limiting grooves and first limiting grooves are used to allow cables of corresponding specifications to pass through, and the bottom of the first limiting groove and the bottom of the second limiting groove simultaneously abut against the cable.

3. The cable limiting mechanism for a submersible electric pump system as described in claim 2, characterized in that, The damping structure includes: Multiple actuating plates are fixedly connected to the upper surface of the annular seat and are spaced apart circumferentially along the annular seat; and Multiple slots are provided on the lower end face of the combined ring to accommodate the insertion of multiple actuating pieces one by one. When multiple actuating plates are inserted into multiple slots, both the second limiting slot and the first limiting slot are directly above the cable connector; at the same time, the side of the actuating plate abuts against the side of the slot to restrict the rotation of the combined ring relative to the annular seat.

4. The cable limiting mechanism for a submersible electric pump system as described in claim 1, characterized in that, The rotation drive component includes: An internal gear is fixedly connected to the upper end face of the transmission ring and is coaxially arranged with the transmission ring; and The first rotating motor is fixedly connected to the outer peripheral wall of the oil pipe and is positioned above the internal gear. The first rotating motor has a power output axis that is parallel to the vertical direction, and its lower end is connected to a transmission gear that meshes with the internal gear. When the first rotating motor starts, the transmission gear drives the internal gear to rotate, thereby causing the transmission ring to rotate.

5. The cable limiting mechanism for a submersible electric pump system as described in claim 1, characterized in that, The beam positioning component includes: The support rod has one end fixedly connected to the outer peripheral wall of the transmission ring, and the other end extends outward along the radial direction of the transmission ring, with an inner baffle at the extended end. Two fixed shafts are arranged side-by-side horizontally on the inner baffle, and their axial directions are both parallel to the support rod; one end of each fixed shaft is fixedly connected to the inner baffle; and The outer baffle is fixedly connected to the other end of the two fixed shafts to cooperate with the inner baffle to limit the range of movement of the cable along the axial direction of the fixed shafts; Each of the fixed shafts is rotatably fitted with a guide wheel, the cable is adapted to pass between the two fixed shafts, and the outer walls of the two guide wheels simultaneously abut against the outer wall of the cable.

6. The cable limiting mechanism for a submersible electric pump system as described in claim 5, characterized in that, The synchronization structure includes: Multiple protrusions are spaced apart circumferentially on the outer peripheral wall of the transmission ring, and each protrudes in a corresponding manner to one of the multiple support rods; and Two side clamps are respectively set on both sides of the docking member, and their length direction is parallel to the vertical direction; Each of the side clamps has a rubber block extending toward the space between the two side clamps at its lower end, and the rubber block is adapted to abut against the side of the protrusion so that the two side clamps abut against the two sides of the protrusion respectively; when the transmission ring rotates, the protrusion drives the docking member to rotate synchronously around the oil pipe as an axis through the side clamps.

7. The cable limiting mechanism for a submersible electric pump system as described in claim 1, characterized in that, The docking components include: A ring-shaped seat is used for sliding connection with an oil pipe via an annular guide rail, with the sliding direction being the circumference of the oil pipe. The ring-shaped seat has multiple through holes arranged side-by-side in a vertical direction, each through hole for a cable of a corresponding specification to pass through. Furthermore, the outer surface of the ring-shaped seat has multiple positioning holes that correspond one-to-one with the multiple through holes. A fixed frame is fixedly connected to the ring seat, and a transmission component is slidably connected to it along the radial direction of the ring guide rail. The transmission component has multiple docking arms that are inserted into multiple positioning holes in a one-to-one correspondence. The fixed frame and the transmission component have an adjustable distance structure, which allows the transmission component to move toward or away from the annular seat so that each docking arm can be inserted into the corresponding through hole and abut against and limit the cable end in the through hole.

8. The cable limiting mechanism for a submersible electric pump system as described in claim 7, characterized in that, The adjustment structure includes: A fixing nut is fixedly connected to the fixing frame, and its axial direction is parallel to the sliding direction of the transmission component; and An adjusting screw is threadedly connected to the fixing nut, and one end of the screw is rotatably connected to the transmission component. When the adjusting screw rotates, it can translate relative to the fixed nut to push or pull the transmission component toward or away from the annular seat.

9. The cable limiting mechanism for a submersible electric pump system as described in claim 1, characterized in that, The winding component includes: A fixed base for fixing to the ground has a guide cavity extending in a horizontal direction; the guide cavity has a bidirectional screw, both ends of which are rotatably connected to the fixed base, and one end of which is drivenly connected to a second rotating motor. A sliding seat is slidably connected in the guide cavity in the horizontal direction, and its bottom surface has multiple rollers and a mating part that is threadedly connected to the bidirectional screw; when the second rotary motor drives the bidirectional screw to rotate, the mating part reciprocates in the horizontal direction, thereby driving the sliding seat to reciprocate in the horizontal direction; and The winding drum is rotatably connected to the upper surface of the sliding seat, its axial direction is parallel to the sliding direction of the sliding seat, and one end of it is drivenly connected to a third rotating motor. The take-up drum is used to connect to the upper end of the cable. When the take-up drum is connected to the cable, the third rotary motor can drive the take-up drum to rotate so that the cable is wound on the take-up drum. At the same time, the combination structure of the second rotary motor and the bidirectional screw drives the sliding seat to move back and forth, so that the cable can be wound in an orderly manner.

10. A cable limiting method for submersible electric pump systems, based on the cable limiting mechanism of the submersible electric pump according to any one of claims 1-9, characterized in that, Includes the following steps: A. When connecting the oil pipe to the submersible electric pump and connecting the lower end of the cable to the motor, the cable is connected through the positioning member so that the portion of the cable between the oil pipe and the motor is in a taut state; B. Pass the cable through the corresponding specification of the bundle member and connect its upper end to the docking member; C. Activate the rotation drive component to make the transmission ring rotate; simultaneously, the synchronization structure drives the docking component to rotate synchronously, so that the cable is wound around the outer circumference of the oil pipe; D. Insert the submersible electric pump system into the well until the mounting component is flush with the wellhead; E. Activate the rotation drive component to cause the transmission ring to rotate in the opposite direction; simultaneously, the synchronization structure drives the docking component to rotate synchronously, so that the cable disengages from the outer periphery of the oil pipe; as well as F. Separate the docking member from the upper end of the cable, and then connect the upper end of the cable to the winding member so that the cable can be pulled out by the winding member.

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