Top packer feeding tool

Abstract

The invention discloses a top packer feeding tool which sequentially comprises a hollow upper connector, a pressure transmitting body, a center pipe upper connector and a center pipe lower connector, the upper end of the upper connector is connected with a drill rod, the lower end of the upper connector is fixedly connected with the upper end of the pressure transmitting body through a fastener I, and the other end of the pressure transmitting body is fixedly connected with one end of the center pipe upper connector through a fastener II. The other end of the upper connector of the central pipe is connected with the lower connector through threads, a plurality of grooves are formed in the lower portion of the pressure transmitting body in the circumferential direction, a protruding block spring and a protruding block are arranged in each groove, the protruding block springs eject the outer side faces of the protruding blocks out of the surface of the pressure transmitting body and stretch into corresponding groove positions of the packer, limiting sleeves are further arranged on the grooves, and chamfered faces are arranged on the edges of the protruding blocks. And the central pipe upper joint is provided with a sealing element which forms isolation sealing with the sealing cylinder of the packer. Rotary tripping-in of the packer is achieved, a hydraulic lock and mechanical lock combined mechanism is adopted, large-displacement circulation can be achieved, operation timeliness and safety can be improved, and accurate setting of the packer is achieved.

Description

Technical Field

[0001] This invention belongs to the field of oil extraction operation technology and relates to a top packer delivery tool for the entire process of top packer insertion, setting, release and retrieval. Background Technology

[0002] In oil and gas extraction operations, the top packer is a core downhole tool in well completion, testing, production, and enhancement (fracturing / acidizing) operations. Its core function is to achieve annular sealing within the well casing, making it a crucial tool for oil and gas well production, water control, and oil stabilization. The top packer delivery tool is a dedicated downhole tool designed to work with the top packer, assisting in the entire process of insertion, setting, release, and retrieval. It is a core supporting actuator for the top packer. Mechanical tools have a simple structure, but due to high friction in the tubing section of horizontal wells and low power transmission efficiency, the packer's setting force is insufficient. Hydraulic tools offer precise and controllable hydraulic setting force and stable setting pressure, but they also suffer from problems such as premature packer setting due to pressure fluctuations during insertion and tubing string inability to rotate during insertion. There is a lack in the market for a delivery tool that can be rotated during insertion while avoiding packer malfunctions caused by pressure fluctuations and mechanical collisions. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a top packer delivery tool that enables the packer to be rotated and lowered into the well, facilitating easier packer insertion. It employs a combined hydraulic and mechanical lock mechanism, ensuring the packer remains stationary when no packer is being deployed. This allows for high-volume circulation, improving operational efficiency and safety, and enabling precise packer setting.

[0004] The present invention adopts the following technical solution: A top packer feeding tool comprises, in sequence, a hollow upper connector, a pressure transmitting body, a central tube upper connector, and a lower connector. The upper end of the upper connector is connected to a drill pipe, and its lower end is fixedly connected to the upper end of the pressure transmitting body by fastener I. The other end of the pressure transmitting body is fixedly connected to one end of the central tube upper connector by fastener II. The other end of the central tube upper connector is threadedly connected to the lower connector. The lower circumferential part of the pressure transmitting body has multiple grooves, each groove containing a protrusion spring and a protrusion. The protrusion spring pushes the outer side of the protrusion out of the surface of the pressure transmitting body and into the corresponding slot of the packer. The groove is also provided with a limiting sleeve for limiting the radial movement distance of the protrusion. The edge of the protrusion has a chamfered surface. The central tube upper connector is provided with a sealing element that forms an isolation seal with the sealing cylinder of the packer.

[0005] Furthermore, the pressure transmitting body is also provided with a piston assembly and a ball seat assembly. The piston assembly is disposed outside the pressure transmitting body and above the protrusion, and the ball seat assembly is disposed in the cavity of the pressure transmitting body. The piston assembly includes a piston sleeve, a piston, a piston spring, a retaining ring I, and a piston pin. The upper end of the piston sleeve forms a sealed connection with the pressure transmitting body, and an annular cavity is formed between the piston sleeve and the pressure transmitting body. The piston is disposed within the annular cavity. The inner and outer sides of the piston form sealed connections with the pressure transmitting body and the piston sleeve, respectively. The retaining ring I is mounted on the pressure transmitting body at the upper end of the piston sleeve. An annular groove is also provided on the outer side of the lower region of the piston. A spring claw is also provided on the outer side of the annular groove. The spring claw is connected to the lower end of the piston sleeve. The lower end of the spring claw forms a serrated structure, which crosses the annular groove and is supported on the side wall of the annular groove. The ball seat assembly is provided with a hydraulic drive structure for driving the piston to move, so that the serrated structure at the lower end of the spring claw disengages from the support of the piston and sinks into the annular groove.

[0006] The ball seat assembly includes a pressure sleeve, a ball seat body, an opening sleeve, and a setting ball. The pressure sleeve is threadedly fixed to the upper cavity of the pressure transmitting body. A hollow cavity is formed in the middle of the ball seat body, which is located at the lower end of the pressure sleeve. A radial annular protrusion is formed on the upper part of the ball seat body. The cavity of the pressure transmitting body is provided with at least three annular grooves from top to bottom: annular groove I, annular groove II, and annular groove III. The inner diameters of annular grooves I, II, and III decrease sequentially. The pressure sleeve and the annular protrusion are disposed in annular groove I. The annular protrusion has multiple axial holes, and the upper end of the annular protrusion has multiple supports. The support block abuts against the lower end of the top pressure sleeve, and the lower end of the annular protrusion abuts against the bottom of the annular groove I. A hydraulic cavity is formed between the ball seat body located below the annular protrusion and the annular groove II, which communicates with the axial hole. The opening sleeve is installed in the hydraulic cavity. The inner and outer sides of the opening sleeve are respectively sealed to the annular groove II and the pressure transmitting body. The opening sleeve and the ball seat body are fixed by a pin I. The pressure transmitting body is also provided with a pressure transmitting hole that communicates with the hydraulic cavity and the annular cavity. When the opening sleeve is hydraulically pushed, the axial hole communicates with the pressure transmitting hole.

[0007] More preferably, the lower part of the hollow cavity of the ball seat body is further provided with a hollow ball seat that is sealed and connected to the ball seat body. The hollow ball seat is fixedly connected to the ball seat body by pin II. The outer diameter of the sealing ball is smaller than the inner diameter of the ball seat body and larger than the inner diameter of the hollow ball seat. The ball seat body located above the hollow ball seat is also provided with a radial liquid inlet hole. When the opening sleeve is hydraulically pushed, the radial liquid inlet hole communicates with the pressure transmission hole.

[0008] Furthermore, a funnel-shaped opening with a gradually decreasing size is formed at the inlet of the ball seat.

[0009] Furthermore, a ball-replenishing basket is provided inside the pressure-transmitting body cavity located below the ball seat assembly. The ball-replenishing basket has several flow channels, the inner diameter of which is smaller than the outer diameter of the seat ball. The ball-replenishing basket is threadedly connected to the pressure-transmitting body.

[0010] Furthermore, the outer side of the central tube upper connector is also fitted with a release piston assembly, which includes a pressure sleeve, a transition joint, a bushing, a release piston spring, a release piston, and a claw-type buckle. The outer circular surface of the central tube upper connector has a stepped structure, which includes stepped tube I, stepped tube II, and stepped tube III from top to bottom. The outer diameters of stepped tube I, stepped tube II, and stepped tube III increase sequentially. The transition joint is threadedly fixed to the upper end of the stepped tube I. A spring washer and a sealing ring are fitted at the lower end of the stepped tube I. The bushing is fitted on the stepped tube I between the transition joint and the spring washer, with its two ends abutting against the transition joint and the spring washer respectively. A release piston spring is fitted on the bushing, with its two ends abutting against the spring washer and the bushing respectively. The lower part of the release piston is sealed and fitted at the stepped tube II, and the upper end of the release piston crosses the sealing ring and abuts against the side of the spring washer. The sealing ring forms a sealed connection with the release piston and the joint on the central tube respectively. The lower part of the release piston is also fitted with a claw-type buckle, which is fixedly connected to the release piston by pin III. The claw-type buckle and the lower part of the release piston are respectively provided with several corresponding axial grooves. The lower part of the stepped tube II of the central tube connector is provided with several radially extending protruding keys. The protruding keys pass through the axial grooves on the release piston and the claw-type buckle in sequence, and are used to control the claw-type buckle, the release piston and the central tube connector to rotate synchronously. The stepped tube II is also provided with a retaining ring groove, in which a retaining ring II is installed. When the dehydration piston moves upward past the position of the retaining ring II, the retaining ring II pops out and blocks the lower end of the release piston.

[0011] Furthermore, external threads are provided at both ends near the lower connector, which are respectively connected to the upper connector of the central tube and the oil pipe. The technical solution of this invention has the following advantages: A. The present invention provides a groove in the circumference of the tubular pressure transmitting body and a protrusion spring, a protrusion and a limiting sleeve located in the groove, so that multiple protrusions are inserted into the slots on the packer, forming a unique rotating mechanism with the packer. This allows the pressure transmitting body and the tubing above it to rotate during the packer lowering process, avoiding accidental loss of service tools and packers due to relative rotation during conventional packer lowering processes.

[0012] B. This invention employs a hydraulic lock and mechanical lock linkage design for the packer. A piston assembly and a ball seat assembly are installed in the pressure transmission body. During packer downhole operations, as long as the packing ball is not deployed, the hydraulic system is protected from operation. As long as the hydraulic cylinder is not activated, the mechanical lock cannot be unlocked, effectively protecting the packer from pressure fluctuations and ensuring operational safety during the running-in process.

[0013] C. The present invention provides a release piston assembly on the outside of the connector on the central tube, and adopts a dual release design of hydraulic release and mechanical release for the packer to ensure that the service tool can be safely detached from the packer downhole.

[0014] D. The present invention also incorporates a ball-catching basket inside the cavity of the pressure-transmitting body to prevent the ball seat and the sealing ball from falling to the bottom of the well, and also to avoid reverse circulation to find the ball. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A cross-sectional view of the overall structure of the feeding tool provided by the present invention; Figure 2 for Figure 1 A schematic diagram showing the torsion of the pressure transmission body and the packer in the middle; Figure 3 for Figure 1 A schematic diagram of the ball seat assembly structure; Figure 4 for Figure 1 A schematic diagram of the piston assembly in mechanical locking; Figure 5 for Figure 1 A schematic diagram of the piston assembly in the mechanical unlocked position; Figure 6 for Figure 1 The piston assembly and ball seat assembly are in a hydraulically locked state, as shown in the diagram. Figure 7 for Figure 1The piston assembly and ball seat assembly are in a hydraulically unlocked state, as shown in the diagram. Figure 8 for Figure 1 A schematic diagram of the cross-section of the release piston assembly; Figure 9 Diagram showing the state of hydraulic locking; Figure 10 This is a diagram showing the hydraulic release state; Figure 11 This is a diagram of the packer assembly.

[0017] The symbols in the diagram represent the following: 1-Upper Connector 2-Pressure transmission body 21-Groove; 22-Annular groove I; 23-Annular groove II; 24-Annular groove III 2a-Pressure transmission hole 3- Connector on the center tube, 31- Raised key 3a - Step tube I, 3b - Step tube II, 3c - Step tube III 4-Lower connector; 5-Fastener I; 6-Fastener II; 7-Protrusion spring; 8-Protrusion 9-Limit sleeve; 10-Seal 20-Piston Assembly 201 - Piston sleeve, 202 - Piston, 202a - Annular groove 203-Piston spring, 204-Snap ring I, 205-Piston pin, 206-Pawl, 207-Key 30-Ball seat assembly 301-Top Pressure Sleeve 302 - Ball seat body, 302a - Radial liquid inlet hole, 3021 - Annular protrusion, 3022 - Support block, 3021a - Axial hole 303 - Opening sleeve, 304 - Sealing ball, 305 - Pin I, 306 - Hollow ball seat 307-Pin II, 308-Replacement Basket 40-Disengage Piston Assembly 401 - Pressure sleeve, 402 - Transition joint, 403 - Bushing, 404 - Release piston spring 405 - Release piston, 406 - Claw-type reverse snap, 407 - Spring washer, 408 - Sealing ring 409 - Pin III, 410 - Snap ring II, 40a - Axial groove a- Annular cavity, b- Hollow cavity, c- Hydraulic cavity A-Seal, B-Part I, C-Part II. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figure 1 Figure 11 As shown, this invention provides a top packer delivery tool, comprising, in sequence, a hollow upper connector 1, a pressure transmitting body 2, a central tube upper connector 3, and a lower connector 4. The upper end of the upper connector 1 is connected to the drill pipe, and its lower end is fixedly connected to the upper end of the pressure transmitting body 2 via fastener I5. The pressure transmitting body 2 is a tubular structure, and its lower end is fixedly connected to one end of the central tube upper connector 3 via fastener II6. The lower end of the central tube upper connector 3 is threadedly connected to the lower connector 4, and the lower connector 4 is threadedly connected to the central tube upper connector 3. The lower end of the lower connector 4 has threads for connection to other tools or tubing. Figure 2 As shown, multiple grooves 21 are provided in the lower circumferential direction of the pressure transmission body 2. Each groove 21 is provided with a protrusion spring 7 and a protrusion 8. The protrusion spring 7 pushes the outer side of the protrusion 8 out of the surface of the pressure transmission body 2 and extends into the corresponding slot of the packer. The groove 21 is also provided with a limiting sleeve 9 for limiting the radial movement distance of the protrusion 8. The edge of the protrusion 8 has a chamfered surface. The connector 3 on the central tube is provided with a sealing element 10 that forms an isolation seal with the sealing cylinder of the packer.

[0022] In this invention, the protrusion spring 7 is placed in the groove 21 at the lower part of the protrusion 8, the protrusion 8 is installed in the groove 21 of the pressure transmitting body 2, and the limiting sleeve 9 is installed on the pressure transmitting body 2 and positioned by a step. Under the force of the protrusion spring 7, the protrusion 8 always maintains an outward movement tendency. When the limiting sleeve 9 is assembled, the protrusion 8 moves outward away from the groove 21, and the limiting sleeve 9 plays the role of limiting the radial movement distance of the protrusion 8.

[0023] To better control the packer hydraulically, such as Figures 3 to 7 As shown, the present invention also provides a piston assembly 20 and a ball seat assembly 30 on the pressure transmitting body 2. The piston assembly 20 is disposed outside the pressure transmitting body 2 and above the protrusion 8, and the ball seat assembly 30 is disposed in the cavity of the pressure transmitting body 2. The structure of the piston assembly 20 and the ball seat assembly 30 is described in detail below.

[0024] like Figure 4 and Figure 7 As shown, the piston assembly 20 includes a piston sleeve 201, a piston 202, a piston spring 203, a retaining ring 1204, and a piston pin 205. The upper end of the piston sleeve 201 forms a sealed connection with the pressure transmitting body 2, and an annular cavity a is formed between the piston sleeve 201 and the pressure transmitting body 2. The piston 202 is disposed in the annular cavity a. The inner and outer surfaces of the piston 202 form sealed connections with the pressure transmitting body 2 and the piston sleeve 201 respectively through sealing elements to maintain the sealing performance of the piston 202. A retaining ring I204 is installed on the pressure-transmitting body 2 at the upper end of the piston sleeve 201. An annular groove 202a is also provided on the outer side of the lower region of the piston 202. A spring claw 206 is also provided on the outer side of the annular groove 202a. The spring claw 206 is fixedly connected to the lower part of the piston sleeve 201 by a piston pin 205. The lower end of the spring claw 206 forms a sawtooth structure, which spans the annular groove 202a and is supported on the side wall of the annular groove 202a, providing good support for the spring claw 206. At the same time, a hydraulic drive structure for driving the piston 202 to move is provided on the ball seat assembly 30, so that the sawtooth structure at the lower end of the spring claw 206 is disengaged from the support of the piston 202 and sinks into the annular groove 202a.

[0025] Specifically, the lower end of the piston sleeve 201 has a threaded pawl 206 for connection to the packer components. The piston 202 is installed inside the piston sleeve 201 and fixed by a piston pin 205. A piston spring 203 is sleeved on the pressure transmitting body 2, with one end abutting against the outer step of the pressure transmitting body 2 and the other end abutting against the end face of the piston 202. After the piston 202 extends, it can be reset by the piston spring 203. The piston sleeve 201 is installed on the pressure transmitting body 2, and the step of the pressure transmitting body 2 and the retaining spring 1204 restrict the forward and backward movement of the piston sleeve 201. Of course, in this invention, the keyway on the pressure transmitting body 2 and the keyway on the piston sleeve 201 are connected by several keys 207 to restrict the rotation of the piston sleeve 201 and the pressure transmitting body 2.

[0026] like Figure 6 and Figure 7 As shown, the ball seat assembly 30 includes a pressure sleeve 301, a ball seat body 302, an opening sleeve 303, and a setting ball 304. The pressure sleeve 301 is threadedly fixed to the upper cavity of the pressure transmitting body 2. A hollow cavity b is formed in the middle of the ball seat body 302, which is located at the lower end of the pressure sleeve 301. A radial annular protrusion 3021 is formed on the upper part of the ball seat body 302. The cavity of the pressure transmitting body 2 is provided with at least annular grooves I22, II23, and III24 from top to bottom. The inner diameters of annular grooves I22, II23, and III24 decrease sequentially. The pressure sleeve 301 and the annular protrusion 3021 are located in annular groove I22. Multiple axial holes 3021a are provided at the annular protrusion 3021. Multiple axial holes 3021a are provided at the upper end of the annular protrusion 3021. The support block 3022 abuts against the lower end of the top pressure sleeve 301, and the lower end of the annular protrusion 3021 abuts against the bottom of the annular groove I22. The ball seat body 302 located below the annular protrusion 3021 and the annular groove II23 form a hydraulic cavity c that communicates with the axial hole 3021a. The opening sleeve 303 is installed in the hydraulic cavity c and fitted onto the ball seat body 302. The inner and outer sides of the opening sleeve 303 are respectively sealed to the annular groove II23 and the pressure transmission body 2 through sealing elements. The opening sleeve 303 and the ball seat body 302 are fixed by the pin I305. The pressure transmission body 2 is also provided with a pressure transmission hole 2a that communicates with the hydraulic cavity c and the annular cavity a. When the opening sleeve 303 is hydraulically pushed, the axial hole 3021a communicates with the pressure transmission hole 2a.

[0027] In addition, for better sealing, a hollow ball seat 306 is provided at the lower part of the hollow cavity b of the ball seat body 302, which is sealed and connected to the ball seat body 302. The hollow ball seat 306 is fixedly connected to the ball seat body 302 by pin II 307. The outer diameter of the sealing ball 304 is smaller than the inner diameter of the ball seat body 302 and larger than the inner diameter of the hollow ball seat 306. A radial liquid inlet hole 302a is also provided on the ball seat body 302 located above the hollow ball seat 306. When the opening sleeve 303 is hydraulically pushed, the radial liquid inlet hole 302a communicates with the pressure transmission hole 2a.

[0028] The opening sleeve 303 is fixed to the ball seat body 302 by pin I305. In the assembled position, the opening sleeve 303 can shield the pressure hole 2a of the pressure transmitting body 2, preventing liquid from entering the hydraulic chamber c. When not in use, the opening sleeve 303 has balanced pressure and is not subjected to axial force. The hollow ball seat 306 has a seal and is installed inside the ball seat body 302, fixed by ball seat pin II307. The ball seat assembly is installed inside the pressure transmitting body 2 and positioned by the internal positioning step of the pressure transmitting body 2. The external thread on the pressure sleeve 301 is screwed into the internal thread at the upper end of the pressure transmitting body 2, fixing the ball seat assembly inside the pressure transmitting body 2. The external thread at the upper end of the pressure transmitting body 2 is screwed into the internal thread at the lower end of the upper connector 1, and after connection, it is fixed by a set of fasteners, which can transmit torque.

[0029] In order to receive the hollow ball seat and the setting ball after they fall, the present invention also provides a ball replenishing basket 308 in the pressure transmitting body cavity located below the ball seat assembly. The ball replenishing basket 308 is provided with several flow channels. The inner diameter of the flow channels is smaller than the outer diameter of the setting ball 304. The ball replenishing basket 308 is threadedly connected to the pressure transmitting body 2.

[0030] When the first setting ball 304 and the hollow ball seat 306 fail, such as due to premature shearing or inability to compress, the present invention forms a funnel-shaped opening with a gradually decreasing size at the inlet of the ball seat body 302. The upper inclined surface of the ball seat body 302 can be used as a spare ball seat, and a larger spare ball can be inserted. All actions of feeding the tool can also be completed through the axial hole 3021a.

[0031] After the feed tool completes all the actions of the packer, when it is necessary to reopen the connection channel between the inside and outside of the tube, simply pressurize inside the tube until pin II 307 is sheared, the hollow ball seat 306 and the seated ball 304 fall into the catch basket 308, and the channel is reopened.

[0032] The packer in this invention also employs a dual release design, combining hydraulic and mechanical release mechanisms, to ensure the service tool can safely detach from the packer downhole. Specifically, a release piston assembly 40 is fitted onto the outside of the connector 3 on the central tube, such as... Figure 9 and Figure 10As shown, it includes a pressure sleeve 401, a transition joint 402, a bushing 403, a release piston spring 404, a release piston 405, and a claw-type reverse buckle 406. The outer circular surface of the connector 3 on the central tube has a stepped structure, which includes stepped tubes I3a, II3b, and III3c from top to bottom, with the outer diameters of stepped tubes I3a, II3b, and III3c increasing sequentially. The transition joint 402 is threadedly fixed to the upper end of the stepped tube I3a. The lower end of the stepped tube I3a is fitted with a spring washer 407 and a sealing ring 408. The bushing 403 is fitted on the stepped tube I3a between the transition joint 402 and the spring washer 407, with its two ends... The bushing 403 is fitted with a release piston spring 404, which abuts against the transition joint 402 and the spring washer 407 respectively. The lower part of the release piston 405 is sealed within the stepped tube II 3b, and the upper end of the release piston 405 crosses the sealing ring 408 and abuts against the side of the spring washer 407. The sealing ring 408 forms a sealed connection with the release piston 405 and the joint 3 on the central tube via sealing elements. A claw-type reverse buckle 406 is also fitted under the release piston 405, and the claw-type reverse buckle 406 is fixedly connected to the release piston 405 via pin III 409. Figure 8 As shown, the lower parts of the claw buckle 406 and the release piston 405 are respectively provided with several corresponding axial grooves 40a. The lower part of the stepped tube II3b of the central tube connector 3 is provided with several radially extending protruding keys 31. The protruding keys 31 pass through the axial grooves 40a on the release piston 405 and the claw buckle 406 in sequence, and are used to control the claw buckle 406, the release piston 405 and the central tube connector 3 to maintain synchronous rotation. A retaining ring groove is also provided on the stepped tube II3b. A retaining ring II410 is installed in the retaining ring groove. When the dehydration piston 405 moves up and passes the position of the retaining ring II410, the retaining ring II410 pops out and blocks the lower end of the release piston 405.

[0033] Specifically, the sealing ring 408 is fitted with seals both inside and outside. The sealing ring 408, fitted onto the central tube upper connector 3, forms a hydraulic cylinder together with the release piston 405. Under external pressure, the release piston 405 can move to the right. A spring washer 407 is on the central tube upper connector 3, one side of which is in close contact with the release piston 405. The release piston spring 404 is fitted onto the central tube upper connector 3, one end on the spring washer 407 and the other end on the step of the bushing 403. The release piston spring 404 provides a preload force to the rightward movement of the release piston 405. The bushing 403 is installed on the central tube upper connector 3, its end face in close contact with the sealing ring 408, restricting the axial movement of the sealing ring 408. The transition joint 402 is screwed onto the central tube upper connector 3, its end face in close contact with the bushing 403, restricting the axial movement of the bushing 403. The central tube upper connector 3 has a seal that can achieve isolation and sealing with the packer sealing cylinder. The upper connector 1 has a threaded end, which can be used to connect with the drill rod above.

[0034] Packer and feed tool disengagement principle: When the packer and feed tool need to be disengaged, two methods can be used: hydraulic disengagement and mechanical disengagement.

[0035] Choose rotary hydraulic release, such as Figure 1 , Figure 9 and Figure 10 As shown, the lowered tubing, pressurized sleeve 401 contacts the packer, freeing the entire claw-type reverse coupling 406. Pressure buildup occurs in the annular space above the packer, with the external pressure of the tubing exceeding the internal pressure. Under this pressure difference, the release piston 405 tends to move to the left. When the hydraulic pressure exceeds the yield strength of pin III 409, pin III is sheared, and the release piston 405 moves to the left. The retaining ring II 410 on the central tube connector 3 pops out, preventing the release piston 405 from returning to its original position after pressure relief. At this point, the claw-type reverse coupling 406 loses the support of the release piston 405. Simply lifting the tubing causes the claw-type reverse coupling 406 to retract under the force of the inclined plane, disabling the threaded connection. Further lifting disengages the tool from the packer.

[0036] When choosing to release a rotating machine, such as Figure 6 and Figure 7 As shown, the first step ensures that the opening sleeve 303 has completed its action. If the opening sleeve 303 does not move, the sealing ball needs to be used to pressurize and activate the opening sleeve, disabling the rotating mechanism. The tubing is then pressed down, and the pressure sleeve 401 contacts the packer, freeing the entire claw-type reverse thread 406. The tubing is rotated 15 turns in the forward direction; the key 31 on the connector 3 of the central tube drives the claw-type reverse thread 406 to rotate. After the thread is fully disengaged, the feed tool and packer are completely separated.

[0037] After the packer is detached from the feed tool, the packer is fixed inside the outer sleeve. Lifting the tubing allows you to remove the feed tool. To reopen the circulation channel, simply pressurize the tubing until the ball seat pin is sheared, causing the ball seat and set ball to fall into the catch basket, thus reopening the circulation channel.

[0038] The packer has a reverse thread connection, which is connected to the claw reverse thread 406 in the feeding tool of the present invention via the reverse thread.

[0039] The entire process of lowering the tubing and the principle of the rotating mechanism: as follows Figure 2As shown, when the tubing needs to rotate during the insertion process, the drill pipe rotates, driving the upper connector 1 of the feed tool. The upper connector 1 and the pressure transmission body 2 are fixedly connected by a set of fasteners I5, which can transmit torque. The plane of the protrusion 8 on the pressure transmission body 2 contacts the packer part A in the groove according to its position, and its function is equivalent to a key, which can transmit torque to drive the external tubing to rotate, thereby realizing the rotation of the entire tubing. When the packer action is completed, the axial relative position of the packer and the feed tool is moved up and down, and the chamfered surface of the protrusion 8 contacts the chamfered surface of the packer part. The inclined plane force compresses the protrusion spring 7, causing the protrusion 8 to retract inward, and the rotation mechanism leaves the packer groove, and the rotation function is released. Before the rotation function is released, the feed tool and the packer will not rotate relative to each other, the reverse connection cannot be disengaged, and there will be no accidental loss of the hand due to the rotation of the tubing during the well insertion process.

[0040] During the lowering process, the fluid is circulated and flushed. The inlet of the liquid cylinder is shielded by the open sleeve, so the pressure is not transmitted to the piston and the well washing pressure does not affect the setting tool.

[0041] Packer and Tool Mechanical Lock Principle: When the tubing string is lowered, the packer's seat sleeve A connects to the feed tool piston sleeve 201 via components IB and IC. At this time, the pawl 206 on the piston sleeve 201 is supported by the piston 202 below and cannot retract inward, forming a mechanical lock. Figure 4 As shown. The force on the packer is transmitted to the drill string through the piston sleeve 201, effectively protecting the packer from abnormal operation during the running-in process that could lead to setting or snagging. Figure 5 As shown, when piston 202 is started and extends, it pushes the packer seat sleeve A downward. The pawl 206 on piston sleeve 201 retracts under the action of the inclined surface of packer C part, and the mechanical lock structure can be disengaged.

[0042] Hydraulic lock principle and setting seal: such as Figure 6 As shown, in the assembly position, the pressure transmission hole 2a on the pressure transmission body 2 is isolated by the ball seat assembly 30, preventing liquid from entering the piston 202. When the ball is not deployed, the pressure on the upper and lower pressure faces of the opening sleeve 303 is balanced. When there is no pressure buildup at the wellhead or when the tubing experiences pressure fluctuations, the piston 202 will not malfunction. Therefore, the piston is in a safe state during the running-in or well-washing process. When the tool is about to enter the setting action, after the setting ball 304 is deployed, the upper and lower pressures of the opening sleeve 303 are isolated by the setting ball 304. When there is pressure buildup at the wellhead, the opening sleeve 303 tends to move downwards. When the hydraulic pressure exceeds the yield strength of the pin of the opening sleeve 303, the pin is sheared, and the opening sleeve moves downwards, exposing the pressure transmission hole 2a. Figure 7As shown. Fluid inside the tubing can enter the annular cavity a through the axial inlet 3021a and then the radial inlet 302a. Pressure is continued until the piston pin shears, and piston 202 activates, disengaging the mechanical lock. Pressure continues to build up, and piston 202 continues to move, pushing the packer to set and engage. This hydraulic and mechanical lock structure is linked; if the hydraulic lock is not released, the mechanical lock cannot be released either, thus more effectively protecting the safety of the tubing insertion process.

[0043] Any aspects not described in this invention are applicable to existing technologies.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A top packer feeding tool, comprising, in sequence, a hollow upper connector, a pressure transmitting body, a central tube upper connector, and a lower connector, wherein the upper end of the upper connector is connected to a drill pipe, and its lower end is fixedly connected to the upper end of the pressure transmitting body by fastener I; the other end of the pressure transmitting body is fixedly connected to one end of the central tube upper connector by fastener II; and the other end of the central tube upper connector is threadedly connected to the lower connector, characterized in that... The lower circumferential part of the pressure transmitting body is provided with multiple grooves, and each groove is provided with a protruding spring and a protrusion. The protruding spring pushes the outer side of the protrusion out of the surface of the pressure transmitting body and into the corresponding slot of the packer. The groove is also provided with a limiting sleeve for limiting the radial movement distance of the protrusion. The edge of the protrusion has a chamfered surface. The connector on the central tube is provided with a sealing element that forms an isolation seal with the sealing cylinder of the packer.

2. The top packer feeding tool according to claim 1, characterized in that, The pressure transmitting body is also provided with a piston assembly and a ball seat assembly. The piston assembly is disposed outside the pressure transmitting body and above the protrusion, and the ball seat assembly is disposed in the cavity of the pressure transmitting body. The piston assembly includes a piston sleeve, a piston, a piston spring, a retaining ring I, and a piston pin. The upper end of the piston sleeve forms a sealed connection with the pressure transmitting body, and an annular cavity is formed between the piston sleeve and the pressure transmitting body. The piston is disposed within the annular cavity. The inner and outer sides of the piston form sealed connections with the pressure transmitting body and the piston sleeve, respectively. The retaining ring I is mounted on the pressure transmitting body at the upper end of the piston sleeve. An annular groove is also provided on the outer side of the lower region of the piston. A spring claw is also provided on the outer side of the annular groove. The spring claw is connected to the lower end of the piston sleeve. The lower end of the spring claw forms a serrated structure, which crosses the annular groove and is supported on the side wall of the annular groove. The ball seat assembly is provided with a hydraulic drive structure for driving the piston to move, so that the serrated structure at the lower end of the spring claw disengages from the support of the piston and sinks into the annular groove.

3. The top packer feeding tool according to claim 2, characterized in that, The ball seat assembly includes a pressure sleeve, a ball seat body, an opening sleeve, and a setting ball. The pressure sleeve is threadedly fixed to the upper cavity of the pressure transmitting body. A hollow cavity is formed in the middle of the ball seat body, which is located at the lower end of the pressure sleeve. A radial annular protrusion is formed on the upper part of the ball seat body. The cavity of the pressure transmitting body is provided with at least three annular grooves from top to bottom: annular groove I, annular groove II, and annular groove III. The inner diameters of annular grooves I, II, and III decrease sequentially. The pressure sleeve and the annular protrusion are disposed in annular groove I. The annular protrusion has multiple axial holes, and multiple support blocks are provided at the upper end of the annular protrusion. The support block abuts against the lower end of the top pressure sleeve, and the lower end of the annular protrusion abuts against the bottom of the annular groove I. A hydraulic cavity is formed between the ball seat body located below the annular protrusion and the annular groove II, which is connected to the axial hole. The opening sleeve is installed in the hydraulic cavity. The inner and outer sides of the opening sleeve are respectively sealed to the annular groove II and the pressure transmitting body. The opening sleeve and the ball seat body are fixed by a pin I. The pressure transmitting body is also provided with a pressure transmitting hole that connects the hydraulic cavity and the annular cavity. When the opening sleeve is hydraulically pushed, the axial hole communicates with the pressure transmitting hole.

4. The top packer feeding tool according to claim 3, characterized in that, The lower part of the hollow cavity of the ball seat body is also provided with a hollow ball seat that is sealed and connected to the ball seat body. The hollow ball seat is fixedly connected to the ball seat body by pin II. The outer diameter of the sealing ball is smaller than the inner diameter of the ball seat body and larger than the inner diameter of the hollow ball seat. The ball seat body located above the hollow ball seat is also provided with a radial liquid inlet hole. When the opening sleeve is hydraulically pushed, the radial liquid inlet hole communicates with the pressure transmission hole.

5. The top packer feeding tool according to claim 3, characterized in that, The inlet of the ball seat is formed with a funnel-shaped opening whose size gradually decreases.

6. The top packer feeding tool according to any one of claims 2-5, characterized in that, A ball-replenishing basket is also provided inside the pressure-transmitting body cavity located below the ball seat assembly. The ball-replenishing basket has several flow channels, the inner diameter of which is smaller than the outer diameter of the seat ball. The ball-replenishing basket is threadedly connected to the pressure-transmitting body.

7. The top packer feeding tool according to claim 6, characterized in that, The outer side of the central tube upper connector is also fitted with a release piston assembly, which includes a pressure sleeve, a transition joint, a bushing, a release piston spring, a release piston, and a claw-type reverse buckle. The outer circular surface of the central tube upper connector has a stepped structure, which includes stepped tube I, stepped tube II and stepped tube III from top to bottom. The outer diameter of stepped tube I, stepped tube II and stepped tube III increases sequentially. The transition joint is threadedly fixed to the upper end of the stepped tube I. A spring washer and a sealing ring are fitted at the lower end of the stepped tube I. The bushing is fitted on the stepped tube I between the transition joint and the spring washer, with its two ends abutting against the transition joint and the spring washer respectively. A release piston spring is fitted on the bushing, with its two ends abutting against the spring washer and the bushing respectively. The lower part of the release piston is sealed and fitted at the stepped tube II, and the upper end of the release piston crosses the sealing ring and abuts against the side of the spring washer. The sealing ring forms a sealed connection with the release piston and the joint on the central tube respectively. The lower part of the release piston is also fitted with a claw-type buckle, which is fixedly connected to the release piston by pin III. The claw-type buckle and the lower part of the release piston are respectively provided with several corresponding axial grooves. The lower part of the stepped tube II of the central tube connector is provided with several radially extending protruding keys. The protruding keys pass through the axial grooves on the release piston and the claw-type buckle in sequence, and are used to control the claw-type buckle, the release piston and the central tube connector to rotate synchronously. The stepped tube II is also provided with a retaining ring groove, in which a retaining ring II is installed. When the dehydration piston moves upward past the position of the retaining ring II, the retaining ring II pops out and blocks the lower end of the release piston.

8. The top packer feeding tool according to claim 1, characterized in that, External threads are provided at both ends near the lower connector, which are respectively connected to the upper connector of the central tube and the oil pipe.

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