Split soluble setting tool

Abstract

The utility model discloses a split type soluble setting tool, which comprises a central pipe, a female thread for connecting a tubing string is arranged at the upper end of the central pipe, a rubber cylinder, a cone and a slip are sequentially sleeved on the outer periphery of the lower part of the central pipe from top to bottom, the top of the rubber cylinder abuts against the outer step of the central pipe, and the outer taper surface of the cone is inserted into the upper port of the slip; a guide body, the outer taper surface of the upper end of the guide body is inserted into the lower port of the slip; a mandrel, the large-diameter end of the upper part of the mandrel is fixed in the inner cavity of the central pipe through a releasing shear pin, and the small-diameter section of the lower part of the mandrel extends out of the lower end of the central pipe; a piston cone, the main cylinder wall of the piston cone abuts against the inner wall of a liquid cylinder, the outer taper surface of the upper end of the piston cone is attached to the inner taper surface of the lower end of the guide body, the lower end of the piston cone is inwardly reduced in diameter to form a piston and is sealed with the outer wall of the small-diameter section of the mandrel and the inner wall of the liquid cylinder; the liquid cylinder, the lower end of the liquid cylinder is threadedly connected with a guide ball seat; the guide ball seat, the upper screw hole of the guide ball seat is connected with the small-diameter section of the mandrel, and the central hole of the guide ball seat is provided with a flared port for setting a soluble ball. The tool can realize the setting of the packer at the lower part of the large-diameter patching pipe first, and the setting tool can be completely dissolved after releasing.

Description

Technical Field

[0001] This utility model relates to a hand-release tool for oilfield well workover, and more particularly to a split-type soluble setting tool, belonging to the technical field of well workover tools. Background Technology

[0002] As oilfields enter the ultra-high water-cut stage, formation adjustments become increasingly frequent, leading to a large workload for water shut-off and a greater number of downhole tools and complex wellbore structures. Currently used mechanical sealing techniques utilize bridge plugs and packers with small diameters, preventing tubing from passing through. Furthermore, the pump cannot pass through tubing below the sealing layer, necessitating the use of packer-equipped tubing strings or inserted tubing strings. This results in difficulties in later well management and an increased risk of well collapse.

[0003] Currently, commonly used setting tools and sealing structures are integrated designs, mainly composed of a balancing mechanism, a sealing mechanism, a setting mechanism, and a locking mechanism. Pressure is applied from the tubing, and hydraulic fluid enters the piston chamber through the central tube outlet, pushing the setting piston upwards, shearing the setting pin, and then pushing the locking sleeve upwards to compress the rubber sleeve. Simultaneously, the locking sleeve and locking ring engage and lock, preventing the rubber sleeve from being retracted, thus achieving setting and locking. However, the setting mechanism cannot be released or dissolved. After setting, the diameter is small; in oilfields, the maximum diameter of the packer inside a 5½″ casing is approximately 58mm, which the tubing cannot pass through. Repair operations typically require retrieving multiple stuck setting tools, resulting in numerous procedures. Furthermore, wellbore scaling necessitates additional milling operations, and stuck tubing is a frequent occurrence, increasing well workover costs and prolonging the well occupation period. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0006] The purpose of this utility model is to overcome the problems existing in the prior art and provide a split-type soluble setting tool that can first set the packer at the bottom of a large-diameter plugging pipe. After being released, the setting tool can be completely dissolved. The dissolution time is adjustable, and no new debris is generated, ensuring the plugging effect and throughput of easy-to-drill plugging pipes.

[0007] To solve the above technical problems, this utility model provides a split-type soluble setting tool, comprising: The central tube has a female thread at the upper end for connecting to the tubing string; The rubber sleeve, cone, and slip are sequentially fitted onto the lower outer periphery of the central tube from top to bottom. The top of the rubber sleeve abuts against the outer step of the central tube, and the bottom abuts against the top of the cone. The outer conical surface of the cone is inserted into the upper port of the slip. The guide body has its upper outer conical surface inserted into the lower port of the slip; The upper large-diameter end of the mandrel is fixed to the inner cavity of the central tube by a slip-on scissor pin, and the lower small-diameter section extends out of the lower end of the central tube. The piston cone has its main body wall attached to the inner wall of the liquid cylinder. The upper outer conical surface is in contact with the lower inner conical surface of the guide body. The lower end narrows inward to form the piston. The piston is sealed with the outer wall of the small diameter section of the mandrel and the inner wall of the liquid cylinder. The lower end of the hydraulic cylinder is threadedly connected to the guide ball seat; The guide ball seat has a screw hole at the top that connects to the small-diameter section of the mandrel, and a flared opening at the top of the center hole for setting the soluble ball.

[0008] Furthermore, the split-type soluble setting tool of this utility model also includes: A locking ring is fitted onto the lower part of the central tube and embedded in the annular groove of the guide body. The inner wall of the locking ring is engaged with the outer wall of the central tube by a one-way sawtooth thread, and the outer wall is engaged with the inner wall of the guide body by a one-way sawtooth thread. Furthermore, the central tube, rubber sleeve, cone, slipper, release scissor pin, guide body, and locking ring constitute a large-diameter plugging pipe.

[0009] Furthermore, the mandrel, piston cone, hydraulic cylinder, soluble ball, and guide ball seat of the dropped scissors are soluble components after the scissors are cut.

[0010] Furthermore, the locking ring has staggered slits on its upper and lower circumferences to provide elasticity.

[0011] Furthermore, two mandrel sealing rings are embedded on the outer periphery of the upper large-diameter end of the mandrel to form a seal with the inner wall of the central tube; the piston outer sealing ring and piston inner sealing ring are respectively embedded on the lower end piston cone outer and inner walls to form a seal with the inner wall of the liquid cylinder and the outer wall of the small-diameter section of the mandrel.

[0012] Furthermore, the upper outer periphery of the guide ball seat is provided with a male thread that connects to the female thread at the lower end of the liquid cylinder, and a sealing ring is embedded below the male thread section to seal with the inner wall of the liquid cylinder.

[0013] Furthermore, after the large-diameter plugging pipe is plugged in the sleeve with an outer diameter of 139.7 mm, the inner diameter is ≥95 mm.

[0014] Compared to the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. The setting tool is made of soluble material, which can be completely dissolved under well conditions, and the dissolution time is adjustable; 2. The setting tool and the sealing and locking mechanism adopt a separate design. The oil pipe is pressurized to set the seal, and the pressure can be increased further to release the handle, ensuring the inner diameter of the sealing pipe; 3. The inner diameter of the plug after the setting seal is released is large, ensuring that the inner diameter of the 139.7mm outer diameter casing is ≥95mm after plugging, which can ensure the passage of oil pipe; 4. After being released, the sealing performance of the plug can be verified, ensuring the plugging effect of the easy-drill plug, saving operating costs and reducing the well occupation period. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein: Figure 1 This is a schematic diagram of the structure of the split-type soluble sealing tool of this utility model; Reference numerals: 1. Central tube; 2. Rubber tube; 3. Cone; 4. Slipper; 5. Drop screw; 6. Guide body; 7. Locking ring; 8. Mandrel; 9. Piston cone; 10. Hydraulic cylinder; 11. O-ring; 12. Soluble ball; 13. Guide ball seat. Detailed Implementation

[0016] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0017] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] like Figure 1As shown, the split-type soluble setting tool of this utility model includes a central tube 1, a rubber sleeve 2, a cone 3, a slip 4, a release shear pin 5, a guide body 6, a locking ring 7, a mandrel 8, a piston cone 9, a hydraulic cylinder 10, a soluble ball 11, and a guide ball seat 12. The upper end of the central tube 1 is connected to the oil pipe string by a female thread. The rubber sleeve 2, the upper cone 3, and the slip 4 are sequentially fitted onto the lower outer circumference of the central tube 1 from top to bottom. The top of the rubber sleeve 2 abuts against the lower step of the central tube 1, and the bottom of the rubber sleeve 2 abuts against the top of the upper cone 3. The lower end of the outer conical surface of the upper cone 3 is inserted into the upper port of the slip 4, and the upper end of the outer conical surface of the guide body 6 is inserted into the lower port of the slip 4.

[0020] The locking ring 7 is fitted around the lower outer circumference of the central tube 1 and embedded in the annular groove in the middle of the inner cavity of the guide body 6. The upper and lower ends of the locking ring 7 abut against the inner steps of the guide body 6. The inner wall of the locking ring 7 is connected to the sawtooth male thread of the central tube 1 through a sawtooth female thread; the outer wall of the locking ring 7 is connected to the sawtooth female thread of the inner wall of the middle section of the guide body 6 through a sawtooth male thread. The lower end of the guide body 6 has an inner conical surface that fits against the outer conical surface of the upper end of the piston cone 9.

[0021] The locking ring 7 has slits on its upper and lower circumferences, and the phases of the upper and lower slits are staggered, so that the locking ring 7 has a certain elasticity. The sawtooth male thread of the central tube 1 and the sawtooth female thread of the locking ring 7 can only mesh in one direction, so that the guide body 6 will not retract after moving upward relative to the central tube 1, ensuring that the squeezing force on the slip 4 and the rubber sleeve 2 will not disappear.

[0022] The upper large-diameter end of the mandrel 8 is located in the lower inner cavity of the central tube 1. The upper circumference of the mandrel 8 is connected to the central tube 1 by symmetrically distributed drop scissor pins 5. Two mandrel sealing rings are embedded on the outer circumference of the mandrel 8 above the drop scissor pins 5 to achieve a seal with the inner wall of the central tube 1. A guide flared mouth is provided at the upper end of the central hole of the mandrel 8 to facilitate the passage of the soluble ball 11.

[0023] The main body wall of the piston cone 9 abuts against the inner wall of the hydraulic cylinder 10. The upper end of the main body wall of the piston cone 9 has an external step, which rests above the upper port of the hydraulic cylinder 10. The upper outer wall of the external step has an outer conical surface that is narrower at the top and wider at the bottom, which is inserted into the lower inner conical surface of the guide body 6. The lower end of the large-diameter end of the spindle 8 is located in the upper inner cavity of the piston cone 9 and is in contact with the upper inner wall of the piston cone 9.

[0024] The lower part of the mandrel 8 is the small diameter section of the mandrel. The lower end of the piston cone 9 is narrowed inward to form a piston. A hydraulic chamber is provided between the bottom of the piston and the upper end of the guide ball seat 12. The outer wall of the piston is fitted with an outer piston sealing ring to form a seal with the inner wall of the hydraulic cylinder 10. The inner wall of the piston is fitted with an inner piston sealing ring to form a seal with the outer wall of the small diameter section of the mandrel. The male thread at the lower end of the mandrel 8 is connected to the female thread at the upper end of the guide ball seat 12. The lower part of the mandrel 8 is symmetrically provided with multiple mandrel through holes that communicate with the hydraulic chamber at the bottom of the piston.

[0025] The lower female thread of the hydraulic cylinder 10 is connected to the male thread on the upper outer circumference of the guide ball seat 12. A sealing ring is embedded at the root of the male thread of the guide ball seat to achieve a seal with the inner wall of the hydraulic cylinder 10. The upper end of the center hole of the guide ball seat 12 is provided with a flared mouth for the soluble ball 11 to be seated.

[0026] The working principle of this split-type soluble setting tool is as follows: During use, the split-type soluble setting tool is lowered to the designed downhole position via tubing. Soluble balls 11 are inserted into the tubing. When the soluble balls 11 reach the upper end of the guide ball seat 12, pressure is applied to the tubing. The piston cone 9 pushes the guide body 6 upwards, compressing the slips 4 and the rubber sleeve 2. The slips 4 are anchored to the inner wall of the casing, and the rubber sleeve 2 seals the annulus. Simultaneously, the locking ring 7 locks the guide body 6 onto the central tube 1, ensuring the rubber sleeve 2 remains sealed. Pressure can then be applied to the casing to test the sealing performance of the rubber sleeve 2. Then, pressure is applied to the tubing. When the pressure reaches a certain value, the release shear pin 5 is sheared, and the mandrel 8, piston cone 9, hydraulic cylinder 10, soluble balls 11, and guide ball seat 12 fall to the bottom of the well. All the materials used in this process are made of soluble materials and will dissolve quickly at the bottom of the well, without affecting subsequent operations.

[0027] The central tube 1, rubber sleeve 2, cone 3, slip 4, release shear pin 5, guide body 6, and locking ring 7 constitute a large-diameter plugging pipe. After the outer diameter of the 139.7mm casing is plugged, the inner diameter is ≥95mm, and the 89mm oil pipe can pass through freely.

[0028] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A split-type soluble setting tool, characterized in that, include: The central tube (1) has a female thread at its upper end for connecting the tubing string; The rubber tube (2), cone (3) and slip (4) are sequentially fitted around the lower outer periphery of the central tube (1) from top to bottom. The top of the rubber tube (2) abuts against the outer step of the central tube (1), and the bottom abuts against the top of the cone (3). The outer cone surface of the cone (3) is inserted into the upper port of the slip (4). The guide body (6) has its upper outer conical surface inserted into the lower port of the slip (4); The upper large-diameter end of the mandrel (8) is fixed to the inner cavity of the central tube (1) by a slip-on scissor nail (5), and the lower small-diameter section extends out of the lower end of the central tube (1); The piston cone (9) has its main body wall attached to the inner wall of the liquid cylinder (10). The upper outer cone surface is attached to the lower inner cone surface of the guide body (6). The lower end narrows inward to form a piston. The piston is sealed with the outer wall of the small diameter section of the mandrel (8) and the inner wall of the liquid cylinder (10). The lower end of the hydraulic cylinder (10) is threadedly connected to the guide ball seat (12); The guide ball seat (12) has an upper screw hole connected to the small diameter section of the mandrel, and the upper end of the center hole is provided with a flared mouth for setting the soluble ball (11).

2. The split-type soluble sealing tool according to claim 1, characterized in that, Also includes: The locking ring (7) is sleeved on the lower part of the central tube (1) and embedded in the annular groove of the inner cavity of the guide body (6). The inner wall of the locking ring (7) is engaged with the outer wall of the central tube (1) by a one-way sawtooth thread, and the outer wall is engaged with the inner wall of the guide body (6) by a one-way sawtooth thread.

3. The split-type soluble setting tool according to claim 2, characterized in that: The central tube (1), rubber sleeve (2), cone (3), slipper (4), drop screw (5), guide body (6) and locking ring (7) constitute a large-diameter plugging pipe.

4. The split-type soluble setting tool according to claim 2, characterized in that: After the shear pin (5) is cut, the spindle (8), piston cone (9), hydraulic cylinder (10), soluble ball (11) and guide ball seat (12) are soluble components.

5. The split-type soluble setting tool according to claim 2, characterized in that: The locking ring (7) has staggered slits on its upper and lower circumferences to provide elasticity.

6. The split-type soluble setting tool according to claim 1, characterized in that, Two mandrel sealing rings are embedded on the outer periphery of the upper large diameter end of the mandrel (8) to form a seal with the inner wall of the central tube (1); the piston outer sealing ring and piston inner sealing ring are embedded on the lower piston cone (9) outer and inner walls respectively to form a seal with the inner wall of the liquid cylinder (10) and the outer wall of the small diameter section of the mandrel (8) respectively.

7. The split-type soluble sealing tool according to claim 1, characterized in that, The upper outer periphery of the guide ball seat (12) is provided with a male thread that connects to the female thread at the lower end of the liquid cylinder (10), and a sealing ring is embedded below the male thread section to seal the inner wall of the liquid cylinder (10).

8. The split-type soluble sealing tool according to claim 3, characterized in that, After the large-diameter plugging pipe is plugged in the sleeve with an outer diameter of 139.7mm, the inner diameter is ≥95mm.

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