A mechanical anchoring structure for a switch sleeve, an anchoring force testing device, and a testing method.

Abstract

This invention provides a mechanical anchoring structure for a switch sleeve, an anchoring force detection device, and a detection method. The mechanical anchoring structure includes an upper connector, a flow-through short section, a sleeve body, and a lower connector connected sequentially from top to bottom. A core is coaxially assembled inside the sleeve body, with one end of the core contacting the upper or lower connector. A limiting groove is provided on the outer wall of the core, and an anchoring elastic piece is assembled within the limiting groove. The anchoring elastic piece and the core move axially together under the action of axial force. The anchoring force detection device of this invention can realize the anchoring between the sleeve body and the core, as well as axial movement under external force, and the anchoring force of the anchoring elastic piece can be adjusted. The anchoring force detection method provided by this invention can directly measure and read the reading of a tension gauge, intuitively, simply, and efficiently completing the testing and detection of the mechanical anchoring force, thus improving the accuracy of anchoring force detection.

Description

Technical Field

[0001] This invention belongs to the field of oil production tool technology, specifically relating to a mechanical anchoring structure for a switch sleeve and an anchoring force detection device and detection method. Background Technology

[0002] Currently, the anchoring design for oilfield tools typically uses slips or ceramic anchors. Both of these anchoring methods are immovable, meaning that the positions of the anchoring element and the anchored element are relatively fixed after anchoring. Switching sleeves require both sufficiently large anchoring forces to achieve reliable fixation and the ability to allow relative movement between the anchoring element and the anchored element under external forces, thus enabling the opening or closing of the sleeve. The anchoring force directly affects the ease of opening and closing the sleeve; therefore, anchoring design and anchoring force testing are crucial for the reliability of the sleeve switch. Summary of the Invention

[0003] The objectives of this invention are threefold: first, to provide a mechanical anchoring structure for a switch sleeve; second, to provide an anchoring force detection device; and third, to provide an anchoring force detection method, in order to overcome the aforementioned technical deficiencies.

[0004] To solve the above-mentioned technical problems, the present invention provides a mechanical anchoring structure for a switch sleeve, comprising an upper connector, a current-passing short section, a sleeve body, and a lower connector connected sequentially from top to bottom. A core is coaxially assembled inside the sleeve body, and one end of the core is in contact with the upper connector or the lower connector. A limiting groove is provided on the outer wall of the core, and an anchoring elastic piece is assembled in the limiting groove. The anchoring elastic piece and the core move together axially under the action of axial force.

[0005] Furthermore, the outer wall surface of the anchoring elastic piece is in close contact with the inner wall surface of the outer jacket, the inner wall surface of the anchoring elastic piece is in close contact with the outer wall surface of the limiting groove, and the wall thickness of the anchoring elastic piece is the same as the depth of the limiting groove.

[0006] Furthermore, an assembly groove is axially formed on the end face of the core, and a load-bearing groove is provided on the inner wall of the core.

[0007] Furthermore, the inner wall of the outer casing is provided with a closing positioning groove and an opening positioning groove, and the anchoring elastic piece slides axially between the closing positioning groove and the opening positioning groove.

[0008] Furthermore, the flow passage is symmetrically provided with flow holes on the flow passage section.

[0009] Preferably, the anchoring elastic piece has an arc-shaped structure, and the circumferential angle of the anchoring elastic piece is adjustable.

[0010] The present invention also provides an anchoring force detection device for detecting the anchoring force of the mechanical anchoring structure of the switch sleeve. Specifically, it includes a bearing plate, a tension gauge and a tension rope. One end of the tension rope is connected to the bearing plate, and the other end of the tension rope passes through the lower or upper joint and is connected to the tension gauge. Under the action of the tension gauge, the bearing plate slides axially and is sealed and embedded in the bearing groove on the inner wall of the core.

[0011] Furthermore, the axial length of the bearing groove is slightly larger than the outer diameter of the bearing plate, so that the bearing plate can rotate 90 degrees to be coaxial with the sleeve body after being sent axially into the bearing groove.

[0012] Preferably, the outer diameter of the load-bearing plate is 2-4 mm smaller than the assembly groove and the load-bearing groove, and the outer diameter of the load-bearing plate is 3-6 mm larger than the inner diameter of the core.

[0013] Furthermore, the anchoring force testing device is fixed to the assembly table by a vise; specifically, the vise is fixedly connected to the upper or lower connector.

[0014] The present invention also provides a method for detecting anchoring force, comprising the following steps:

[0015] S1, Start the detection operation

[0016] Remove the lower connector, connect one end of the tension rope to the bearing plate, and then move the bearing plate axially along the assembly groove to the bearing groove. Rotate the bearing plate to make it coaxial with the sliding sleeve body. At this time, the tension rope is located on one side of the lower connector. Tighten the lower connector and pass the other end of the tension rope through the lower connector to connect it to the tension gauge.

[0017] Turn on the tension gauge. The force of the tension gauge is applied axially to the core through the tension rope and the support plate. The outer diameter of the anchoring elastic piece gradually shrinks under the action of the axial force and slides axially with the core until the anchoring elastic piece slides to the opening positioning groove. At this time, the end face of the core contacts the end face of the lower connector and the core cannot move. Turn off the power of the tension gauge, observe and record the anchoring force read by the tension gauge throughout the process. At this time, the flow hole on the flow passage is opened by the core, realizing the opening of the sliding sleeve.

[0018] S2, shut down the detection operation.

[0019] Remove the lower connector, connect one end of the tension rope to the bearing plate, and then move the bearing plate axially along the assembly groove to the bearing groove. Rotate the bearing plate to make it coaxial with the sliding sleeve body. At this time, the tension rope is located on the side of the upper connector. Tighten the upper connector and pass the other end of the tension rope through the upper connector to connect it to the tension gauge.

[0020] Turn on the tension gauge. The force of the tension gauge is applied axially to the core through the tension rope and the support plate. The outer diameter of the anchoring elastic piece gradually shrinks and slides axially with the core until the anchoring elastic piece slides to the closing positioning groove. At this time, the end face of the core contacts the end face of the upper connector and the core cannot move. Turn off the power of the tension gauge and observe and record the magnitude of the anchoring force read by the tension gauge throughout the process. At this time, the flow hole on the flow short section is blocked by the core, realizing the closing of the sliding sleeve.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The mechanical anchoring structure of the switch sleeve designed based on the anchoring elastic sheet of the present invention can not only realize the anchoring between the sleeve body and the core and the axial relative movement under the action of external force, but also the anchoring force of the anchoring elastic sheet can be adjusted.

[0023] 2. The anchoring elastic plate has an arc-shaped structure, and its circumferential angle can be adjusted, thereby changing the contact area between the outer and inner walls of the anchoring elastic plate and the sliding sleeve body and core, making the anchoring force adjustable. The anchoring elastic plate designed in this invention not only provides reliable anchoring, but also allows the anchoring element and the anchored element to move axially relative to each other under the action of external force, realizing the opening or closing of the sliding sleeve.

[0024] 3. The anchoring force detection method provided by the present invention can conveniently measure the specific value of the anchoring force required by the sliding sleeve during the opening and closing process, providing guidance for the optimized design of anchoring parts.

[0025] 4. The anchoring force detection method described in this invention can directly measure and read the tension gauge reading, and complete the testing and detection of the mechanical anchoring force in an intuitive, simple and efficient manner, thereby improving the accuracy of anchoring force detection.

[0026] To make the above description of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the mechanical anchoring structure of the switch sleeve;

[0028] Figure 2 This is an axial front view of the anchoring elastic plate;

[0029] Figure 3 This is a radial front view of the anchoring elastic sheet;

[0030] Figure 4 This is a schematic diagram of the anchoring force detection device;

[0031] Figure 5 This is a schematic diagram of the open state of the mechanical anchoring structure of the switch sleeve;

[0032] Figure 6 This is a schematic diagram of the closed state of the mechanical anchoring structure of the switch sleeve.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Lower connector;

[0035] 2. Sliding sleeve body; 2.1. Close the positioning groove; 2.2. Open the positioning groove;

[0036] 3. Flow-through sub; 3.1. Flow-through orifice;

[0037] 4. Connect the connector;

[0038] 5. Core; 5.1. Limiting groove; 5.2. Assembly groove; 5.3. Load-bearing groove;

[0039] 6. Anchoring elastic sheet; 6.1. Outer wall surface; 6.2. Inner wall surface;

[0040] 7. Load-bearing plate;

[0041] 8. Force gauge;

[0042] 9. Tension rope;

[0043] 10. Bench vise. Detailed Implementation

[0044] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0045] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0046] First implementation method:

[0047] This embodiment relates to a mechanical anchoring structure for a switch slide, referring to... Figure 1 It includes an upper connector 4, a flow short section 3, a sliding sleeve body 2 and a lower connector 1 connected sequentially from top to bottom. A core 5 is coaxially assembled inside the sliding sleeve body 2. One end of the core 5 is in contact with the upper connector 4 or the lower connector 1. A limiting groove 5.1 is provided on the outer wall of the core 5. An anchoring elastic piece 6 is assembled inside the limiting groove 5.1. The anchoring elastic piece 6 and the core 5 move axially together under the action of axial force.

[0048] Furthermore, referring toFigure 1 The inner wall of the outer jacket 2 is provided with a closing positioning groove 2.1 and an opening positioning groove 2.2, and the anchoring elastic piece 6 slides axially between the closing positioning groove 2.1 and the opening positioning groove 2.2.

[0049] It should be noted that an axial assembly groove 5.2 is provided on the end face of the core 5, and a load-bearing groove 5.3 is provided on the inner wall surface of the core 5.

[0050] like Figure 2 , Figure 3 As shown, the anchoring elastic piece 6 has an arc-shaped structure, and the circumferential angle of the anchoring elastic piece 6 is adjustable, thereby changing the contact area between the outer wall surface 6.1 and inner wall surface 6.2 of the anchoring elastic piece 6 and the outer sleeve 2 and core 5, and setting different anchoring forces. The anchoring elastic piece 6 can provide radial anchoring force. Under the action of axial force, the outer diameter of the anchoring elastic piece 6 can shrink to be the same as the outer diameter of the core 5, and slide up and down together with the core 5 in the axial direction.

[0051] Furthermore, referring to Figure 1 The inner wall of the outer sleeve 2 is provided with a closing positioning groove 2.1 and an opening positioning groove 2.2. The anchoring elastic piece 6 slides axially between the closing positioning groove 2.1 and the opening positioning groove 2.2. Specifically, the outer wall surface 6.1 of the anchoring elastic piece is in close contact with the inner wall surface of the outer sleeve 2, and the inner wall surface 6.2 of the anchoring elastic piece is in close contact with the outer wall surface of the limiting groove 5.1, thereby fixing the position of the core 5 and the outer sleeve 2 relatively, and the wall thickness of the anchoring elastic piece 6 is the same as the depth of the limiting groove 5.1. When the core 5 moves relative to the outer sleeve 2, the anchoring elastic piece 6 is forced to compress, which can completely sink into the limiting groove 5.1, and thus move up and down with the core 5 until it moves to the closing positioning groove 2.1 or the opening positioning groove 2.2, at which point it returns to its original state and anchors. The anchoring elastic piece of the present invention not only anchors reliably, but also allows the sliding sleeve body 2 and the core 5 to move axially relative to each other under the action of external force, realizing the opening or closing of the sliding sleeve.

[0052] Furthermore, flow holes 3.1 are symmetrically provided on the flow short section 3. The flow holes 3.1 are the communication channels between the inside of the sliding sleeve and the external reservoir after the sliding sleeve is opened, and are the channels for formation oil and gas to flow into the inside of the sliding sleeve.

[0053] Second implementation method:

[0054] This embodiment relates to an anchoring force detection device for detecting the anchoring force of the mechanical anchoring structure of the switch sleeve, referring to... Figure 4The system includes a mechanical anchoring structure for a switch sleeve, a load-bearing plate 7, a tension gauge 8, and a tension rope 9. The mechanical anchoring structure comprises, from top to bottom, an upper connector 4, a flow-through short section 3, a sleeve body 2, and a lower connector 1 connected sequentially. The flow-through short section 3 has symmetrical flow-through holes 3.1. A core 5 is coaxially assembled inside the sleeve body 2. One end of the core 5 slides in contact with either the upper connector 4 or the lower connector 1. A limiting groove 5.1 is provided on the outer wall of the core 5, and an anchoring elastic piece 6 is assembled within the limiting groove 5.1. It should be noted that under axial force, the outer diameter of the anchoring elastic piece 6 can shrink to the same size as the outer diameter of the core 5, allowing it to slide axially up and down together with the core 5. An assembly groove 5.2 is axially opened on the end face of the core 5, and a load-bearing groove 5.3 is provided on the inner wall of the core 5. The load-bearing plate 7 is assembled inside the core 5. The anchoring elastic piece 6 and the core 5 move axially together under axial force.

[0055] Furthermore, the load-bearing plate 7 is a circular blind plate. Hooks are provided on both sides of the load-bearing plate 7, and the outer diameter of the load-bearing plate 7 is 2-4 mm smaller than the assembly groove 5.2 and the load-bearing groove 5.3, while the outer diameter of the load-bearing plate 7 is 3-6 mm larger than the inner diameter of the core 5. The load-bearing plate 7 can smoothly pass through the assembly groove 5.2 and be assembled into the load-bearing groove 5.3, with its axial direction confined within the load-bearing groove 5.3. It should be noted that the axial length of the load-bearing groove 5.3 is slightly larger than the outer diameter of the load-bearing plate 7, allowing the load-bearing plate 7 to smoothly rotate 90 degrees to become coaxial with the sliding sleeve body 2 after being axially fed into the load-bearing groove 5.3. (Refer to...) Figure 4 The hook on any side of the load-bearing plate 7 is connected to one end of the tension rope 9. The other end of the tension rope 9 passes through the lower connector 1 or the upper connector 4 and is connected to the tension gauge 8. When the tension gauge 8 is activated, the force of the tension gauge is applied axially to the core 5 through the tension rope 9 and the load-bearing plate 7. The outer diameter of the anchoring elastic piece 6 gradually shrinks and slides axially with the core 5, which is limited to the closed positioning groove 2.1 and the open positioning groove 2.2.

[0056] Furthermore, referring to Figure 4 The anchoring force detection device is fixed to the assembly table by a vise 10; preferably, the vise 10 is used to fix the anchoring force detection device of the present invention to the assembly table by clamping the upper connector 4 or the lower connector 1.

[0057] This embodiment also provides a method for detecting anchoring force, including the following steps:

[0058] S1, Start the detection operation

[0059] Remove the lower connector 1, connect one end of the tension rope 9 to the support plate 7, and then move the support plate 7 axially along the assembly groove 5.2 to the support groove 5.3. Rotate the support plate 7 to make it coaxial with the sliding sleeve body 2. At this time, the tension rope 9 is located on one side of the lower connector 1. Tighten the lower connector 1 and pass the other end of the tension rope 9 through the lower connector 1 and connect it to the tension gauge 8.

[0060] When the tension gauge 8 is turned on, the force from the tension gauge 8 is applied axially to the core 5 through the tension rope 9 and the support plate 7. The outer diameter of the anchoring elastic piece 6 gradually contracts under the axial force and slides axially with the core 5 until the anchoring elastic piece 6 slides to the opening positioning groove 2.2. At this point, the end face of the core 5 contacts the end face of the lower connector 1, and the core 5 cannot move. The power to the tension gauge 8 is then turned off. The magnitude of the anchoring force read by the tension gauge 8 throughout the process is observed and recorded. At this time, the flow hole 3.1 on the flow passage stub 3 is opened by the core 5, thus opening the sliding sleeve (e.g., ...). Figure 5 (as shown);

[0061] S2, shut down the detection operation.

[0062] Remove the lower connector 1, connect one end of the tension rope 9 to the support plate 7, and then move the support plate 7 axially along the assembly groove 5.2 to the support groove 5.3. Rotate the support plate 7 to make it coaxial with the sliding sleeve body 2. At this time, the tension rope 9 is located on one side of the upper connector 4. Tighten the upper connector 4, and then pass the other end of the tension rope 9 through the upper connector 4 and connect it to the tension gauge 8.

[0063] When the tension gauge 8 is turned on, the force from the tension gauge 8 is applied axially to the core 5 through the tension rope 9 and the support plate 7. The outer diameter of the anchoring elastic piece 6 gradually contracts and slides axially with the core 5 until the anchoring elastic piece 6 slides to the closing positioning groove 2.1. At this time, the end face of the core 5 contacts the end face of the upper connector 4, and the core 5 cannot move. Turn off the power to the tension gauge 8, observe and record the magnitude of the anchoring force read by the tension gauge 8 throughout the process. At this time, the flow hole 3.1 on the flow passage stub 3 is blocked by the core 5, realizing the closure of the sliding sleeve (e.g.). Figure 6 (As shown).

[0064] The anchoring force detection device and method provided by this invention can conveniently measure the specific value of the anchoring force required by the sliding sleeve during the opening and closing process, providing guidance for the optimized design of anchoring parts.

[0065] Third implementation method:

[0066] This embodiment provides a method for detecting anchoring force, specifically:

[0067] When starting the test, disconnect the lower connector 1 of the sliding sleeve, connect the hook on any side of the support plate 7 to the tension rope 9, and then rotate the support plate 7 axially along the assembly groove 5.2 to the support groove 5.3 and rotate it 90 degrees until it is coaxial with the sliding sleeve body and the tension rope 9 is located on one side of the lower connector 1. Tighten the lower connector 1, place the sliding sleeve on the assembly table 11, fix the lower connector with the bench vise 10, connect the other end of the tension rope 9 to the tension gauge 8, start the tension gauge 8, and the force of the tension gauge is applied axially to the core 5 through the tension rope 9 and the support plate 7. The outer diameter of the anchoring elastic piece 6 gradually shrinks and slides axially with the core 5 until the anchoring elastic piece 6 slides to the opening positioning groove 2.2, the end face of the core contacts the end face of the lower connector, and the core 5 cannot move. Stop the tension gauge, observe and record the magnitude of the anchoring force read by the tension gauge 8 throughout the process. At this time, the flow hole 3.1 on the flow passage stub 3 is opened by the sliding sleeve core 5.

[0068] When closing the test, disconnect the lower connector 1 of the sliding sleeve, connect the hook on any side of the support plate 7 to the tension rope 9, and send the support plate 7 axially along the assembly groove 5.2 to the support groove 5.3, then rotate it 90 degrees until it is coaxial with the sliding sleeve body and the tension rope 9 is located on one side of the upper connector 4. Place the sliding sleeve on the assembly table 11, fix the upper connector 4 with the bench vise 10, connect the other end of the tension rope 9 to the tension gauge 8, start the tension gauge 8, and the force of the tension gauge acts axially on the core 5 through the tension rope 9 and the support plate 7. The outer diameter of the anchoring elastic piece 6 gradually shrinks and slides axially with the core 5 until the anchoring elastic piece 6 slides to the closing positioning groove 2.1, the end face of the core contacts the end face of the upper connector, and the core 5 cannot move. Pause the tension gauge, observe and record the magnitude of the anchoring force read by the tension gauge 8 throughout the process. At this time, the flow hole 3.1 on the flow short section 3 is blocked by the sliding sleeve core 5 and closed.

[0069] The anchoring force detection method provided by this invention is simple, easy to operate, and low in cost.

[0070] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A mechanical anchoring structure for a switch sleeve, comprising an upper connector (4), a current-passing short section (3), a sleeve body (2), and a lower connector (1) connected sequentially from top to bottom, characterized in that: A core (5) is coaxially assembled inside the sliding sleeve body (2). One end of the core (5) is in contact with the upper connector (4) or the lower connector (1). The outer wall of the core (5) is provided with a limiting groove (5.1). An anchoring elastic piece (6) is assembled inside the limiting groove (5.1). The anchoring elastic piece (6) and the core (5) move together along the axial direction under the action of axial force. An assembly groove (5.2) is axially opened on the end face of the core (5). A bearing groove (5.3) is provided on the inner wall of the core (5). The load-bearing plate (7) is a circular blind plate. Hooks are provided on both sides of the load-bearing plate (7). The outer diameter of the load-bearing plate (7) is 2-4 mm smaller than the assembly groove (5.2) and the load-bearing groove (5.3). The outer diameter of the load-bearing plate (7) is 3-6 mm larger than the inner diameter of the core (5). The load-bearing plate (7) can be smoothly assembled into the load-bearing groove (5.3) through the assembly groove (5.2) and its axial direction is limited within the load-bearing groove (5.3). The outer wall surface of the anchoring elastic piece (6) is in close contact with the inner wall surface of the sliding sleeve body (2), the inner wall surface of the anchoring elastic piece (6) is in close contact with the outer wall surface of the limiting groove (5.1), and the wall thickness of the anchoring elastic piece (6) is the same as the depth of the limiting groove (5.1). The inner wall of the sliding sleeve body (2) is provided with a closing positioning groove (2.1) and an opening positioning groove (2.2), and the anchoring elastic piece (6) slides axially between the closing positioning groove (2.1) and the opening positioning groove (2.2); The flow passage section (3) is symmetrically provided with flow passage holes (3.1).

2. The mechanical anchoring structure of the switch sleeve as described in claim 1, characterized in that: The anchoring elastic piece (6) has an arc-shaped structure, and the circumferential angle of the anchoring elastic piece (6) is adjustable.

3. An anchoring force testing device, used to test the anchoring force of the mechanical anchoring structure of the switch sleeve as described in any one of claims 1-2, characterized in that: The anchoring force testing device includes a bearing plate (7), a tension gauge (8), and a tension rope (9). One end of the tension rope (9) is connected to the bearing plate (7), and the other end of the tension rope (9) passes through the lower connector (1) or the upper connector (4) and is connected to the tension gauge (8). Under the action of the tension gauge (8), the bearing plate (7) slides axially and is sealed and embedded in the bearing groove (5.3) on the inner wall of the core (5).

4. The anchoring force detection device as described in claim 3, characterized in that: The axial length of the load-bearing groove (5.3) is greater than the outer diameter of the load-bearing plate (7).

5. The anchoring force detection device as described in claim 3, characterized in that: The anchoring force testing device is fixed to the assembly table by a vise (10); the vise (10) is fixedly connected to the upper connector (4) or the lower connector (1).

6. A method for detecting anchoring force using the anchoring force detection device as described in any one of claims 3-5, characterized in that, Includes the following steps: S1, Start the detection operation Remove the lower connector (1), connect one end of the tension rope (9) to the bearing plate (7), and send the bearing plate (7) axially along the assembly groove (5.2) to the bearing groove (5.3). Then rotate the bearing plate (7) to make it coaxial with the sliding sleeve body (2). At this time, the tension rope (9) is located on one side of the lower connector (1). Tighten the lower connector (1) and connect the other end of the tension rope (9) through the lower connector (1) to the tension gauge (8). Turn on the tension gauge (8). The force of the tension gauge (8) is applied axially to the core (5) through the tension rope (9) and the bearing plate (7). The outer diameter of the anchoring elastic piece (6) gradually shrinks under the action of the axial force and slides axially with the core (5) until the anchoring elastic piece (6) slides to the opening positioning groove (2.2). At this time, the end face of the core (5) contacts the end face of the lower connector (1), and the core (5) cannot move. Turn off the power of the tension gauge (8), observe and record the anchoring force reading of the tension gauge (8) throughout the process. At this time, the flow hole (3.1) on the flow short section (3) is opened by the core (5), realizing the opening of the sliding sleeve. S2, shut down the detection operation. Remove the lower connector (1), connect one end of the tension rope (9) to the bearing plate (7), and send the bearing plate (7) axially along the assembly groove (5.2) to the bearing groove (5.3). Then rotate the bearing plate (7) to make it coaxial with the sliding sleeve body (2). At this time, the tension rope (9) is located on the side of the upper connector (4). Tighten the upper connector (4) and connect the other end of the tension rope (9) through the upper connector (4) to the tension gauge (8). Turn on the tension gauge (8). The force of the tension gauge (8) is applied axially to the core (5) through the tension rope (9) and the bearing plate (7). The outer diameter of the anchoring elastic piece (6) gradually shrinks and slides axially with the core (5) until the anchoring elastic piece (6) slides to the closing positioning groove (2.1). At this time, the end face of the core (5) contacts the end face of the upper connector (4), and the core (5) cannot move. Turn off the power of the tension gauge (8), observe and record the magnitude of the anchoring force read by the tension gauge (8) throughout the process. At this time, the flow hole (3.1) on the flow short section (3) is blocked by the core (5), thus closing the sliding sleeve.

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