A force-fit setting tool and a small-diameter plug

Abstract

A force-adding setting tool and a small-diameter plug, the force-adding setting tool and the small-diameter plug; the force-adding setting tool comprises a fishing head, an upper setting tool outer cylinder and a lower setting tool outer cylinder which are connected axially in sequence; a central pull rod is arranged in the center of the upper setting tool outer cylinder and the lower setting tool outer cylinder, one end of the pull rod is connected with the fishing head, the other end is connected with a first end of a weak point connecting rod, a spring column-shaped reversing key is arranged in a hole of the other end of the pull rod, the reversing key is provided with a spring in a key sleeve, the spring can make the key sleeve pop out, a track groove is arranged on the inner column wall of the reversing sleeve, the track groove is in the shape of a spiral groove + a vertical groove, a step and a slope are arranged inside the track groove, the reversing key is in the structure of a spring column, the spring is compressed in the inside of the key sleeve, a ball bearing is arranged, a sliding ring of the ball bearing is fixed with one end of the reversing sleeve, and a fixed ring of an outer ring of the ball bearing is fixed in the inside of the upper setting tool outer cylinder; the plug is a steel wire operating slip plug.

Description

Technical Field

[0001] This invention belongs to the technical field of oilfield pressurized operation tools. It is a force-setting tool and a small-diameter plugging tool that can solve the technical problem of sealing a large-diameter well with a small-diameter original well string in a water injection well. Background Technology

[0002] CN2016103067002 discloses a downhole plugging device and a well workover technique for raising and lowering sucker rods and tubing under pressure. The disclosed technology includes a sealing boss and a limiting boss with sealing surfaces within the tubing string. A rod pump is installed within the tubing string above the sealing boss. The sealing surface of the sealing boss on the rod pump mates with the sealing surface of the sealing boss within the tubing string. An external inlet hole is provided on the tubing string wall below the limiting boss. An inner tube is installed within this section of the tubing string, with an internal inlet hole corresponding to the external inlet hole. A sealing groove is provided on the inner tube wall below the internal inlet hole, and a sealing ring that seals with the inner wall of the tubing string is installed within the sealing groove. The upper end of the inner tube is connected to the rod pump via a disconnector, and the lower end of the tubing string is sealed.

[0003] Currently, live tubing operations in oil and water wells can only achieve plugging and pressurized removal of tubing above the slack section. Removal of the tool section mostly involves blowout and top-jet removal. For water injection wells, the existing tubing string can only be plugged above the slack section using hydraulic release plugs or pump-driven plugs with an outer diameter of approximately 50mm. During operation, these are dropped from the wellhead and pushed forward by a pump truck to the neck of the tubing string for release and setting. There are no reliable tools for plugging within the slack section. The shortcomings of existing technology include the large outer diameter of the plugs, which cannot plug the slack section of the water injection well tubing, making it impossible to achieve full-length pressurized operation in water injection wells. This results in environmental pollution, formation damage, and high safety risks associated with top-jet operations.

[0004] In the field of live oilfield operations, internal plugging technology for small-diameter tubing strings remains a challenge, especially for water injection well tubing strings. A common water injection well tubing string structure is: tubing + packer + distributor + packer + distributor + packer + tailpipe + plug. Live operations require the plug and setting tool string to be able to pass through the φ46mm eccentric distributor's inner bore to plug the lower tool section, achieving internal control of the tubing string and fulfilling the purpose of live operations.

[0005] However, the sealing effect of existing small-diameter plugs is not ideal. During the experiment, it was found that using hydraulic setting tools to set small-diameter plugs on the ground can achieve a very good sealing effect, but the effect of using mechanical vibrators is not good. This problem has also been verified in actual construction. The difference between hydraulic setting tools and mechanical vibrators mainly lies in three aspects: setting time, setting force, and traction method.

[0006] The setting time of hydraulic setting tools is generally 2-3 minutes. Hydraulic setting tools have high force; the setting force of a φ1.688" (φ42.9mm) specification reaches 20000 lbs (9t). Hydraulic setting tools can provide continuous, stable, and slow traction force.

[0007] In Embodiment 1 of the pipe plug in CN201921405984.6, the arc-shaped ceramic disc is set between the upper connector 1 and the lower connector 2, and the two surfaces of the arc-shaped ceramic disc bear different pressures, so as to achieve the effect of sealing or connecting according to different pressure values. Specifically, after the pipe string is installed, fluid is pumped into the pipe to pressurize and rupture the arc-shaped ceramic disc, thereby achieving the purpose of connecting the pipe string with the well. While this method can effectively solve the problem of blasting ceramic discs by pressurizing when the well pressure is low after well completion, when the downhole pressure exceeds 35 MPa, the pressure applied to the tubing must be greater than the well pressure and a certain blasting coefficient to blast the ceramic disc. This also places higher demands on the pressure-bearing capacity of surface facilities. In such cases, blasting the ceramic disc by pressurizing is extremely prone to accidents. Therefore, a more reliable solution is needed. The above describes a mechanical slapper, whose setting time is variable. It typically requires continuous slapping with a wire tool string until setting is achieved. In actual operation, there have been instances of slapping several times or even hundreds of times, so the setting time usually ranges from 1 minute to several hours. Compared to hydraulic setting tools, mechanical slappers have lower setting force. Their impact force depends on the counterweight of the weight rod, the lifting and lowering speed of the wire, and the performance of the slapper, and is generally below 10 kN. Mechanical slappers provide instantaneous, intermittent force.

[0008] Comparing the force properties provided by hydraulic and mechanical slammer setting tools reveals that for a slammer to achieve better sealing results, it needs to be provided with a slow, powerful, and stable traction force. Unfortunately, while the most advanced electric and electro-hydraulic setting tools currently available meet the traction force requirements, their large outer diameters (1.688" and above) are a significant limitation due to structural design difficulties. This size poses considerable challenges in water injection wells containing oil or wax, typically preventing them from reaching the intended depth. Furthermore, and more importantly, cost is a major factor. Electric and electro-hydraulic setting tools are extremely expensive, making them unaffordable for most operators compared to the relatively low operating costs.

[0009] Given the current state of technology, there is a need for a setting tool with a smaller outer diameter, lower cost, and the ability to provide slow, powerful, and stable traction, along with a matching small-diameter plug, to solve technical challenges such as the internal control of the tubing during pressurized operations in water injection wells. Summary of the Invention

[0010] The purpose of this invention is to improve the sealing effect by proposing a mechanical force-setting sealing tool and a matching small-diameter plug, thereby solving the problem of sealing within the clamping section of the injection well tubing, enabling pressurized operation throughout the entire process of starting the injection well, without top-blowing or venting, protecting the environment and the formation, and achieving safe and environmentally friendly construction.

[0011] The technical solution of this invention: A force-setting tool and a small-diameter plug, comprising two parts: a force-setting tool and a small-diameter plug (13, the plug is located on the right end of the upper connector of the plug, and the force-setting tool is located on the left end). The force-setting tool includes a retrieval head (1), an upper outer cylinder (7), and a lower outer cylinder (10) connected axially in sequence. A central tie rod (2) is provided at the center of the upper and lower outer cylinders of the setting tool. One end of the tie rod is connected to the retrieval head, and the other end is connected to a lead screw (8) and a weak point connecting rod. At the first end of 9, and at the other end of the pull rod 5, a spring-loaded reversing key is installed in the hole perpendicular to the pull rod. The reversing key has a spring inside the key sleeve, which can cause the key sleeve to pop outward. The inner wall of the reversing sleeve 5 has a track groove, which is a spiral groove plus a vertical groove. The track groove has steps and slopes inside. The reversing key 3 is a spring-loaded structure. The spring is compressed inside the key sleeve, and the reversing key is engaged in the track groove. A ball bearing 6 is provided, and the sliding ring of the ball bearing is fixed to one end of the reversing sleeve. The outer ring retaining ring of the ball bearing is fixed inside the outer cylinder of the setting tool; the plug is a wire-operated slip plug, which includes, in sequence, an axially connected upper plug connector (13), an outer cylinder of the anti-reverse ring (16), an upper tapered sleeve (18), a slip (20), a lower tapered sleeve (21), an outer sheath (24), and a lower connector (28); the center rod (17) is located in the center inside the upper plug connector (13), the outer cylinder of the anti-reverse ring (16), and the upper tapered sleeve (18); inside the outer sheath (24) are the inner sheath (22) and the upper rubber sleeve (23); the lower connector (28)... The connector contains a 25-inch rubber barrel, a 26-inch support block, and a 27-inch set screw. A shaft pin and a positioning claw 11 are installed on the outer cylinder 16 of the anti-reverse ring. The positioning claw opens or closes around this pin and is close to the outer cylinder of the anti-reverse ring. A cylindrical plug upper connector 13 is installed behind the shaft pin of the outer cylinder 16 of the anti-reverse ring. The second end of the weak point connecting rod is connected to the center rod 17 inside the setter. The weak point connecting rod is located at the axial position of the concave and convex interface between the lower outer cylinder of the setter tool and the outer cylinder of the anti-reverse ring 16. The outer cylinder 16 of the anti-reverse ring contains a 14-inch spring and a 15-inch anti-reverse ring.

[0012] The inner center of the upper outer cylinder 7 of the setting tool is the reversing sleeve 5 and the ball bearing 6; the inner center of the lower outer cylinder 10 of the setting tool is the lead screw 8 and connected to the weak point connecting rod 9 (easily broken rod).

[0013] The main structure of the tool of this invention is shown in the figure. The tool mainly consists of two parts: a force-setting tool and a small-diameter plug (the plug is on the right end of the upper connector of plug 13, and the tool is on the left end). They can be separated at the weak point connecting rod (fracture point) and the concave-convex interface between the lower outer cylinder of the setting tool and the outer cylinder of the 16 anti-reverse ring.

[0014] The operating principle of this invention: The tool of this invention is lowered using a steel wire operation method. The lowered tool string consists of: steel wire + rope cap + weighted rod + fork-type shock absorber + retrieval tool + the force-setting sealing tool and small-diameter plug of this invention.

[0015] The key feature of the power-assisted setting tool and small-diameter plug is that it converts long-stroke reciprocating motion into axial rotational force. This axial rotational force drives the transmission threads to generate a huge traction force, thereby causing the plug to block and set. The weak points include connecting rod breakage and separation at the concave-convex interface between the lower outer cylinder of the setting tool and the outer cylinder of the 16-ring anti-reverse ring. After setting, the power-assisted setting tool and other tools are pulled out of the well tubing. This method is superior to existing plugging and setting methods and devices.

[0016] The plug of this invention is a small-diameter plug, characterized by a small outer diameter (fitting to oil pipes with a diameter of 2-7 / 8"). The 17 center rod is designed with a square cross section in the 20 slip section. The 13 plug upper connector and the 10 setting tool lower outer cylinder are a concave-convex connector. Through the structural design of the two parts, such as the force setting tool and the pre-setting of the 19 slip, the counter torque generated by the 2 pull rod when working with the force setting tool can be effectively avoided.

[0017] The main specifications of this invention are: a permanent plug (non-retrievable type, the plug can only be removed after it has been set and brought to the surface), a coupling groove positioning type, a steel outer diameter of 38mm, a plug pressure of 35MPa, suitable for plugging tubing with a diameter of 2-7 / 8", a traction force of 5t for the power-setting tool, and a release force of 2t for the weak point connecting rod. The weak point connecting rod can be a reduced diameter connecting rod that breaks under a lower 2t tension (the tensile strength can be set as needed), thus the permanent plug is blocked inside the well casing, while the power-setting tool can be pulled out or retrieved.

[0018] The operation steps of the tool of this invention are as follows:

[0019] 1. The tool string is lowered to a position 3m below the pre-setting position of the tubing string using an eccentric water distributor;

[0020] 2. Lift the tool string so that the 11 positioning claws are engaged in the coupling groove of the tubing string. Continue to lift so that the 20 slips of the plug are opened to achieve pre-setting. At this time, the plug (the main structure is the same as the existing technology) is already engaged inside the tubing string.

[0021] 3. Slowly lower the tool string so that lever 2 falls to the bottom, while reversing key 3 is located at the lower apex of the reversing sleeve inner track groove;

[0022] 4. Slowly lift the tool string, causing the pull rod 2 to drive the reversing key 3 to move obliquely upward along the track groove. The pull rod does not rotate, so the reversing key 3 forces the reversing sleeve 5 to rotate counterclockwise by 180° (or 360° or 540°, etc., multiples of 180°, because the reversing key protrudes at both ends in the vertical direction of the pull rod, and is symmetrical at 180°). The trapezoidal force transmission thread at the lower part of the reversing sleeve 5 drives the fixed screw 8 to move upward (meaning that the screw rotates relative to the male thread of the screw 8 through the female thread at the lower part of the reversing sleeve 5, driving the screw 8 to move upward). The screw 8 drives the weak point connecting rod 9 and the center rod 17 to move upward, squeezing the 20 clamp, the 23 upper rubber sleeve, and the 25 middle rubber sleeve; the permanent plug begins to set; the connecting rod between the force-setting tool and the plug is the weak point connecting rod, and the stress gradually increases.

[0023] 5. Slowly lower the tool string, repeating steps 3-4 until the 9 weak link is broken, at which point the blocker is fully set.

[0024] Beneficial Effects: This invention is a plugging tool for sealing large-diameter wells with small-diameter plugs. The force-setting tool has a small outer diameter and low cost, providing slow, powerful, and stable traction. Its technical performance indicators are close to those of expensive pure electric and electro-hydraulic setting tools. Used in conjunction with the small-diameter plug of this invention, it can solve technical problems such as the internal control of the tubing during pressurized operations in water injection wells, enabling pressurized operations throughout the entire wellbore tripping process, preventing blowouts and protecting the environment and formation, thus achieving safe and environmentally friendly construction. After reaching the set position, the pull rod applies force to move the 5-way sleeve, causing the weak link to break and separating the concave-convex interface between the lower outer cylinder of the setting tool and the outer cylinder of the 16-way anti-reverse ring, completing the setting. Then, the force-setting tool and other tools are pulled out of the well tubing. The plugging and setting method and device of this invention are superior to existing mechanical methods. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a cross-sectional view of the reversing sleeve 5.

[0027] Figure 3 for Figure 1 Detailed view of the left half;

[0028] Figure 4 for Figure 1 Detailed view of the right half.

[0029] Figures 5A-5D These are the four steps involved in the operation of the commutator key. Detailed Implementation

[0030] The diagram of the device of the present invention shows: 1. retrieval head, 2. pull rod, 3. reversing key, 4. reversing key spring, 5. reversing sleeve, 7. upper outer cylinder of the setting tool, 10. lower outer cylinder of the setting tool, 16. outer cylinder of the anti-reverse ring, 18. upper conical sleeve, 20. collet, 21. lower conical sleeve, 22. inner sheath, and 23. upper rubber sleeve inside the outer sheath 24; 24. outer sheath, 25. middle rubber barrel, 26. support block, 27. set screw inside the lower connector 28; 7. the upper outer cylinder of the setting tool is equipped with 5. reversing sleeve and 6. ball bearing, (8. lead screw, 9. weak point connecting rod inside the lower outer cylinder 10 of the setting tool; 12. shaft pin (positioning claw opens or closes around this pin shaft), 16. the outer cylinder of the anti-reverse ring is equipped with There are 14 springs, 15 anti-reverse rings; 17 center rods are located inside 13 plugs, 16 anti-reverse ring outer cylinders, and 18 upper conical sleeves; 20 slips contain 19 spring sleeves, 21 lower conical sleeves, 22 inner sheaths, 23 upper rubber sleeves, 24 outer sheaths, 25 middle rubber barrels, 26 support blocks, 27 set screws, and 28 lower connectors; the reversing key is vertical and passes through the pull rod; the reversing key is symmetrical, with each end of an internal spring abutting the top of the reversing key, i.e., the key sleeve; the reversing key abuts the symmetrical oblique groove track next to the symmetrical (a pair of parallel) vertical grooves inside the reversing sleeve. 29 spiral grooves, 30 vertical grooves, and 31 (recessed) steps.

[0031] The inner wall of the reversing sleeve 5 has a spiral groove and a vertical groove, meaning the groove has steps and a slope. The reversing key 3 is a spring column structure (the spring is compressed inside the key sleeve). Starting at the initial position ①, when the pull rod 2 is lowered, the reversing key 3 moves downwards simultaneously with the pull rod 2 (during which the reversing sleeve 5 experiences no resistance). The key sleeve is pressed tightly against the groove wall under the action of the spring. The key body of the reversing key 3 is fixed to the end of the pull rod. The reversing key 3 starts at the initial position ①. When the pull rod 2 is lowered, the reversing key 3 moves downwards simultaneously with the pull rod 2 (along the vertical groove). During this process, the reversing sleeve 5 experiences no resistance. The reversing key 3 can smoothly descend to position ② with the pull rod 2. During this process, the reversing key 3 will pass through a more recessed step within the groove. The two ends of the reversing key 3 extend under the elasticity of the reversing key spring 4, thus falling to the lower, more recessed step. In the recessed track groove; the reversing key 3 will fall into the vertical recessed step (a deeper groove or hole in the track groove) after passing through the track groove. That is, under the compression of the reversing key spring 4, the reversing key 3 will fall into the deeper groove of the track groove. When the reversing key 3 is pulled upward, due to the obstruction of the recessed step, the reversing key 3, which is stretched by the spring, is restricted by the step and cannot move directly upward along the vertical groove. The reversing key 3 can only be constrained to move to the top of the track ① along the obliquely upward spiral track groove. During this process, because the pull rod 2 that is pulled up and down cannot rotate, the track groove is forced to rotate by the torque of the reversing key 3 (the ball bearing 6 will support it). At the same time, during the movement, the spiral track groove gradually becomes shallower, the spring in the reversing key 3 is compressed, the two ends of the reversing key are shortened, and the reversing key 3 will return to the initial position ①. When the reversing key 3 moves downward again, the above actions are repeated. The final effect is that the lever 2 (which drives the entire tool) can be lowered continuously without resistance, and when the lever 2 is lifted, it will generate a torque on the reversing sleeve 5.

[0032] The key features of this invention are: the design of the track groove and the reversing key 3: the track groove inside the reversing sleeve is designed with a pair of parallel vertical grooves, and a stepped groove at the lower end of the vertical groove. The inclined groove has a slope. When the reversing key 3 moves downward, after passing the step, the reversing key 3, under the compression of the reversing key spring 4, will fall into the groove of the lower track. When the reversing key 3 moves upward, it will move along the inclined groove track to the top of the track. At the same time, the track gradually becomes shallower during the movement. This action is repeated when the reversing key 3 moves downward again. The final effect is that the pull rod 2 can be lowered without resistance, and when the pull rod 2 is lifted, it will generate a torque on the reversing sleeve 5.

[0033] A ball bearing 6 is provided, and the pull rod can rotate inside the reversing sleeve 5, which can reduce the friction generated when the reversing sleeve 5 and the lower outer cylinder 10 of the setting tool rotate relative to each other.

[0034] The outer cylinder 7 and the reversing sleeve 5 of the setting tool have through holes to balance the suction pressure generated when the unblocking lever 2 is in motion.

[0035] The reversing sleeve 5 and the lead screw 8 are connected by a trapezoidal force transmission thread, making the torque conversion to traction force more efficient. The upper part of the reversing sleeve has helical grooves and vertical grooves; the lower part of the reversing sleeve has a trapezoidal force transmission thread (female thread), which drives the fixed lead screw 8 to move upward. That is, the female thread at the lower part of the reversing sleeve 5 meshes with the male thread of the lead screw 8, driving the lead screw 8 upward through a threaded screw drive. The length requirement of the female thread at the lower part of the reversing sleeve 5 is: to ensure that the upward distance of the lead screw 8 can meet the stroke required for the blocker slip 20 to sit, the rubber sleeve to compress, and the weak point connecting rod 9 to break. Therefore, the length of the reversing sleeve must be more than 12 cm.

[0036] Anti-torque design. The 17 center rod is designed with a square cross section in the 20 slip section; the fit between the 20 slip and the 18 upper cone sleeve and the 21 lower cone sleeve has a guide protrusion to prevent relative rotation; the 13 plug upper connector and the 10 setting tool lower outer cylinder are a male-female joint. Through these two structural designs and the pre-setting of the 19 slip, the anti-torque generated by the 2 pull rod can be effectively avoided when working with the force-setting tool.

[0037] The design of the force-adjusting sealing tool converts the long-stroke reciprocating motion into axial rotational force, which drives the force transmission threads to generate huge traction force.

[0038] The plug connector 13 is designed with an inner retrieval diameter, and in special circumstances, the GS retrieval tool can be used for retrieval.

[0039] The design of the 9-weak-point connecting rod has a breaking force of 2t (lower than the traction force of the booster setting tool). The breaking point is at the necked section in the middle of the connecting rod, ensuring that the plug receives sufficient setting force before breaking and being released, allowing the plug to set at the end of the well. This facilitates the retrieval of the booster setting tool and other tools. The weak-point connecting rod structure is also frequently used in existing downhole tools such as cable bridge plugs. Of course, the breaking force design of the 9-weak-point connecting rod can be customized according to the size of the well and the application angle.

[0040] The function of positioning claw 11 is to provide initial positioning for the tool and to open the plug's slips to achieve pre-setting. As the tool string descends, positioning claw 11 slides down the pipe wall. After the tool string has passed the predetermined setting depth, it is slowly lifted, and the positioning claw will engage in the tubing coupling groove. Further lifting pulls the center rod 17, causing slip 20 to open and engage the pipe wall to achieve pre-setting. The plug can be referenced in CN2012104384251, "Over-clamping wire mesh operation slip plug," which has already been manufactured and used by the applicant. The slip-type plug's structure fully meets the requirements of this invention.

[0041] The main specifications of this invention are: permanent plug (non-retrievable, detachable after being set and removed from the ground), coupling groove positioning type, steel body outer diameter 38mm, plug pressure 35MPa, suitable for plugging 2-7 / 8" (close to 3") oil pipes, force-setting tool traction force 5t, weak point linkage release force 3t.

[0042] The four workstations with reversing keys correspond to Figure 5A , Figure 5B , Figure 5C , Figure 5D : Reversing key 3 starts from the top initial position, i.e. Figure 5A Moving downwards ( Figure 5B As the reversing key 3 descends along the vertical groove, it is subjected to the elastic force of an internal spring. During the process of the reversing key sleeve adhering tightly to the track groove (or step), the track (groove) gradually becomes shallower. The reversing key 3, acting on the spring 4, gradually compresses until it crosses the step. Then, the spring 4 pushes the reversing key 3 into the deeper, sloping track groove step. Figure 5C ); Figure 5D When the reversing key 3 moves upward, it will move along the upward-sloping track groove to the original position at the top of the track. During this process, because the lever 2 does not rotate, the reversing sleeve 5 is forced to rotate.

Claims

1. A force-applying setting tool and a small-diameter plug, characterized in that it consists of... It consists of two parts: a force-setting tool and a small-diameter plug. The plug is located on the right side of the upper connector, while the force-setting tool is on the left. The force-setting tool includes a retrieval head, an upper outer cylinder, and a lower outer cylinder connected axially in sequence. A central pull rod is located between the upper and lower outer cylinders of the setting tool. One end of the pull rod is connected to the retrieval head, and the other end is connected to the lead screw and the first end of the weak point connecting rod. A spring-shaped reversing key is installed in the hole perpendicular to the other end of the pull rod. The reversing key is a key sleeve with a spring inside, which can cause the key sleeve to pop outward. The inner wall of the reversing sleeve has a track groove, which is a spiral groove + vertical groove shape. The track groove has a step and a slope inside. The track groove inside the reversing sleeve is a pair of parallel vertical grooves, with symmetrical oblique groove tracks next to the vertical grooves. There is a groove step at the lower end of the vertical groove, and the oblique groove has a slope. The reversing key has a spring column structure. The spring is compressed inside the key sleeve, and the spring is compressed inside the key sleeve. The key engages within the track groove and is equipped with a ball bearing. The sliding ring of the ball bearing is fixed to one end of the reversing sleeve, and the outer ring of the ball bearing is fixed inside the outer cylinder of the setting tool. The plug is a wire-operated slip plug, which includes, in sequence, an upper plug connector, a backstop ring outer cylinder, an upper cone sleeve, slips, a lower cone sleeve, an outer sheath, and a lower connector, all connected axially. The center rod is located at the center inside the upper plug connector, the backstop ring outer cylinder, and the upper cone sleeve. The inner sleeve and upper rubber sleeve are inside the sheath; the lower connector contains the middle rubber barrel, support block, and set screw; the outer cylinder of the anti-reverse ring is equipped with a shaft pin and positioning claw, which opens or closes around this pin and is close to the outer cylinder of the anti-reverse ring; the upper cylindrical plug connector is installed behind the shaft pin of the outer cylinder of the anti-reverse ring; the second end of the weak point connecting rod is connected to the center rod inside the setter; the weak point connecting rod is located at the axial position of the concave and convex interface between the lower outer cylinder of the setter tool and the outer cylinder of the anti-reverse ring; the outer cylinder of the anti-reverse ring contains a spring and an anti-reverse ring.

2. The force-applying setting tool and small-diameter plug as described in claim 1, characterized in that, The central rod is designed with a square cross section in the slip section, and the upper connector of the plug and the lower outer cylinder of the setting tool are connected by a male and female connector.

3. The force-applying setting tool and small-diameter plug as described in claim 1, characterized in that, The plug is a coupling groove positioning type, with a steel body outer diameter of 38mm, a plug pressure of 35MPa, and is suitable for plugging oil pipes with a diameter of 2-7 / 8". The force-setting tool has a traction force of 5t, and the weak point connecting rod release force is 2t.

4. The force-applying setting tool and small-diameter plug as described in claim 1, characterized in that, The outer cylinder and reversing sleeve of the setting tool have through holes.

5. The force-applying setting tool and small-diameter plug as described in claim 1, characterized in that, The upper part of the reversing sleeve has helical grooves and vertical grooves; the lower part of the reversing sleeve has a trapezoidal force transmission thread and is a female thread. The female thread of the lower part of the reversing sleeve meshes with the male thread of the lead screw.

6. The force-applying setting tool and small-diameter plug as described in claim 5, characterized in that, The reversing sleeve is over 12 centimeters long.

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