Knotting device of knot temporary plugging agent and knot temporary plugging agent structure

Abstract

The utility model belongs to the technical field of oil and gas well temporary plugging agents, and discloses a knotting device of a knotted temporary plugging agent and a knotted temporary plugging agent structure. The air cylinder is fixedly mounted on the end face of the machine body; the lifting plate is installed at the movable end of the air cylinder, the lifting plate is formed by combining a mounting plate, a pneumatic piston and a positioning plate, the mounting plate is fixedly installed at the movable end of the air cylinder, the pneumatic piston is installed at the end of the mounting plate, and the bent portion of the arc-shaped metal ring in the clamping structure faces the circle center; when a rope body is clamped, annular wrapping type fixing can be formed on the end portion of the rope body, a stable foundation is provided for follow-up rope head disassembling operation, in cooperation with the guiding effect of the flow guide cover, fibers on the end portion of the rope body can be disassembled into uniform divergent structures conveniently, and the rope head disassembling efficiency is improved. And the finally prepared rope knot temporary plugging agent can form good hanging and anchoring effects underground.

Description

Technical Field

[0001] This utility model belongs to the technical field of temporary plugging agents for oil and gas wells, and particularly relates to a knotting device and structure of a knotted temporary plugging agent. Background Technology

[0002] Temporary plugging agents are key sealing materials in temporary plugging fracturing technology for oil and gas wells. They mainly work by forming a high-strength, biodegradable knot structure within the wellbore to temporarily seal fractures or lost circulation zones, providing pressure support for subsequent fracturing operations, and ultimately being degraded and discharged with the flowback fluid. Currently, the preparation of temporary plugging agents heavily relies on manual knotting or simple hand clamps, resulting in low efficiency, poor knot consistency, and unstable mechanical properties, which severely restricts the large-scale application of temporary plugging fracturing technology.

[0003] After the rope knot temporary plugging agent is formed by multi-ring winding, it needs to be separated from the formed knot by a cutting mechanism in order to complete the preparation of a single temporary plugging agent. However, at the moment of cutting, the formed winding group loses the continuous tension constraint and end clamping, which easily leads to problems such as overall loosening, ring misalignment, and node loosening. This results in a significant reduction in the mechanical strength and sealing performance of the knot, which cannot meet the requirements for high-pressure temporary plugging of oil and gas wells.

[0004] After the rope knot temporary plugging agent is formed by multi-ring winding, it needs to be separated from the formed knot by a cutting mechanism to complete the preparation of a single temporary plugging agent. However, at the moment of cutting, the ends of the remaining rope groups to be processed will spring back and become scattered due to the loss of fixation. Before the next knotting operation, manual or auxiliary mechanisms are required to re-sort and rotate the scattered rope groups to restore the ends to a smooth state that is easy to clamp and wind. This process not only greatly reduces production efficiency, but also makes it difficult to control the consistency of the knot due to manual intervention. Furthermore, repeated rotation and sorting can easily cause rope fiber fatigue and a decrease in strength, further affecting the finished product qualification rate of the temporary plugging agent. Utility Model Content

[0005] This invention addresses the problem in existing technologies where the ends of unfinished rope assemblies, due to loss of fixation, experience free rebound and scattering. Before the next knotting operation, manual or auxiliary mechanisms are required to manually or through auxiliary mechanisms to re-sort and rotate the scattered rope assemblies to restore the ends to a smooth state suitable for clamping and winding. This process not only significantly reduces production efficiency but also makes it difficult to control knot consistency due to manual intervention. Furthermore, repeated rotation and sorting can cause rope fiber fatigue and reduced strength, further affecting the finished product qualification rate of the temporary sealing agent. The following technical solution is proposed:

[0006] A knot-tying device for a temporary knot sealant, comprising: a body having an L-shaped structure;

[0007] The cylinder is fixedly installed on the end face of the machine body;

[0008] A lifting plate is installed on the movable end of the cylinder. The lifting plate is composed of a mounting plate, a pneumatic piston, and a positioning plate. The mounting plate is fixedly installed on the movable end of the cylinder. The pneumatic piston is installed on the end of the mounting plate. Two positioning plates are installed on the movable end of the pneumatic piston.

[0009] A support column is disposed between the two positioning plates and is movably connected to the lifting plate;

[0010] A placement plate is fixedly installed on one end face of the machine body;

[0011] The clamping structure is fixedly installed inside the lifting plate and is used to clamp and position the rope cutting part.

[0012] As a preferred embodiment of the above technical solution, the clamping structure includes:

[0013] An arc-shaped plate is fixedly installed on a positioning plate inside the lifting plate. The arc-shaped plate has a circular hole in the middle and a fixing ring integrally formed at the bottom end of the arc-shaped plate, which is equal to the inner diameter of the circular hole.

[0014] The air deflector is fixedly installed at the top of the arc-shaped plate and located at the edge of the circular hole;

[0015] The mounting cover is fixedly installed on the outside of the fixing ring of the arc-shaped plate;

[0016] A circular sleeve is threadedly connected to the bottom edge of the inner wall of the mounting cover;

[0017] The drive ring is welded to the bottom of the outer surface of the circular sleeve;

[0018] Multiple circular rings are fixedly installed on the top end of the drive ring;

[0019] A connecting ring is fixedly installed on the bottom end of the inner wall of the circular sleeve;

[0020] A support ring is sleeved on the outside of the connecting ring, and a circular groove is formed inside the support ring to fit the connecting ring;

[0021] A column is provided through the top end of the support ring, and the column is fixedly connected to the mounting cover;

[0022] An arc-shaped metal ring is fixedly connected between the top edge of the support ring and the inner wall edge of the mounting cover, with the curved part facing the center of the support ring.

[0023] As a preferred embodiment of the above technical solution, the connecting ring and the supporting ring are rotatably connected through the circular groove.

[0024] As a preferred embodiment of the above technical solution, the arc-shaped metal ring is an elastic metal sheet structure, which is used to generate deformation when the support ring is displaced.

[0025] A knot-sealing agent structure, comprising a rope body;

[0026] A knot is formed by winding the rope body, and the knot is a single rope knot;

[0027] The rope end is formed by disassembling the end of the rope away from the knot, and the rope ends are distributed in a radiating pattern.

[0028] As a preferred embodiment of the above technical solution, the rope body, knot, and rope end are all made of biodegradable PBS plastic material.

[0029] The beneficial effects of this utility model are as follows:

[0030] (1) By setting up a clamping structure, this utility model utilizes the elastic deformation characteristics of the arc-shaped metal ring, and combines the linkage design of the drive ring, the circular sleeve, the connecting ring and the support ring to achieve stepless clamping force adjustment at the end of the rope. Operators can flexibly adjust the clamping force according to the rope material and diameter to ensure that the rope will not slip or loosen during the rope threading, winding and knotting process, thereby improving the accuracy and success rate of knotting.

[0031] (2) The curved metal ring inside the clamping structure is oriented towards the center. When clamping the rope, it can form a circumferential wrapping fixation on the end of the rope, providing a stable foundation for subsequent rope head disassembly operations. With the guiding effect of the flow guide, the end fibers of the rope can be easily disassembled into a uniform divergent structure, so that the final rope knot plugging agent can form a good suspension and anchoring effect downhole. Attached Figure Description

[0032] Figure 1 The diagram shown is a structural schematic of a knotting device for a knotting temporary plugging agent in Example 1;

[0033] Figure 2 The diagram shown is a schematic diagram of the clamping structure in Embodiment 1;

[0034] Figure 3 The diagram shown is a cross-sectional view of the clamping structure in Embodiment 1;

[0035] Figure 4 The diagram shown is a structural schematic of a knot-blocking agent structure in Example 1.

[0036] In the diagram: 1. Body; 2. Cylinder; 3. Lifting plate; 4. Support column; 5. Placement plate; 6. Clamping structure; 61. Arc plate; 62. Flow guide; 63. Circular sleeve; 64. Drive ring; 65. Circular ring; 66. Circular groove; 67. Connecting ring; 68. Support ring; 69. Arc-shaped metal ring; 610. Column; 611. Mounting cover; 7. Rope; 8. Rope knot; 9. Rope end. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Example 1

[0038] This utility model provides a knotting device and a structure for a temporary knot plugging agent, such as... Figures 1 to 3 As shown, the machine includes a body 1, which has an overall L-shaped structure to provide a mounting base for various components. A cylinder 2 is fixedly installed on the top end face of the body 1. The cylinder 2 serves as a power source, and a lifting plate 3 is installed on its movable end. The lifting plate 3 is composed of a mounting plate, a pneumatic piston, and a positioning plate. The mounting plate is fixedly installed on the movable end of the cylinder 2, and the pneumatic piston is installed on the end of the mounting plate. Two positioning plates are installed on the movable end of the pneumatic piston. A support column 4 is inserted between the two positioning plates and is movably connected to the lifting plate 3 to provide guidance and stability. A placement plate 5 is fixedly installed on the bottom end face of the body 1, and the placement plate 5 is located below the horizontal plane of the cylinder 2 to place the rope 7 to be knotted.

[0039] like Figure 2 and Figure 3 As shown, a clamping structure 6 is fixedly installed inside the lifting plate 3. This structure is used to clamp and position the cut part of the rope for subsequent disassembly and knotting operations. Specifically, the clamping structure 6 includes an arc plate 61, which is fixedly installed on the positioning plate inside the lifting plate 3. A circular hole is opened in the middle of the arc plate 61, and a fixing ring is integrally formed at the bottom end of the arc plate 61. The fixing ring has the same inner diameter as the circular hole. A flow guide 62 is fixedly installed at the top of the arc plate 61 at the edge of the circular hole. The flow guide 62 plays a guiding role. An installation cover 611 is fixedly installed on the outside of the fixing ring of the arc plate 61. A circular sleeve 63 is connected to the bottom edge of the inner wall of the installation cover 611 by a thread. A drive ring 64 is welded to the bottom of the outer surface of the circular sleeve 63. Multiple circular rings 65 are fixedly installed at the top of the drive ring 64. The circular rings 65 make it easy for the operator to manually or with the help of tools to rotate the drive ring 64.

[0040] A connecting ring 67 is fixedly installed at the bottom of the inner wall of the sleeve 63. A support ring 68 is sleeved on the outside of the connecting ring 67. A circular groove 66 is opened inside the support ring 68 to fit the connecting ring 67, so that the connecting ring 67 and the support ring 68 are rotatably connected through the circular groove 66. That is, the support ring 68 can rotate relative to the connecting ring 67 within a certain angle. A column 610 is connected through the top of the support ring 68, and the column 610 is fixedly connected to the mounting cover 611 to play a limiting role. An arc-shaped metal ring 69 is fixedly connected between the top edge of the support ring 68 and the inner wall edge of the mounting cover 611. The arc-shaped metal ring 69 is a flexible metal sheet structure, and its curved part faces the center of the support ring 68.

[0041] When the drive ring 64 is rotated, the sleeve 63 drives the connecting ring 67 to rotate. Due to the rotational connection between the connecting ring 67 and the support ring 68 and the limiting effect of the column 610, the support ring 68 will be displaced, thereby stretching or compressing the arc-shaped metal ring 69 and changing the clamping force of the arc-shaped metal ring 69 on the rope 7. Example 2

[0042] This utility model also provides a rope knot temporary plugging agent structure prepared using the above-mentioned knotting device, including a rope body 7, a rope knot 8, and a rope end 9. The rope knot 8 is formed by winding the rope body 7, specifically a single rope knot. The rope end 9 is formed by disassembling the end of the rope body 7 away from the rope knot 8, and the rope end 9 is distributed in a divergent manner. This divergent rope end 9 can open in the downhole fracture to form a good anchor. In this preferred embodiment, the rope body 7, the knot 8, and the rope end 9 are all made of biodegradable PBS plastic material, which not only ensures sufficient strength but also allows it to gradually degrade after completing the temporary plugging function, reducing pollution to the formation.

[0043] Working principle: The rope 7 is pre-installed on the sleeve, the rope is looped on the outside of the sleeve, and then the sleeve is fixed on the outside of the column. Pulling the rope causes the sleeve to rotate, and then the sleeve is looped on the outer surface of the support column 4 of the lifting plate 3, so that the rope 7 is fixed on the support column 4 through the sleeve. This method of installing the rope 7 on the support column 4 through the sleeve is a conventional technique for placing the rope 7, and will not be elaborated on here. Placing the rope 7 through the support column 4 ensures that it will not be displaced as a whole in subsequent operations.

[0044] Start cylinder 2 to drive lifting plate 3 to move up and down along support column 4, so that lifting plate 3 and clamping structure 6 on it enter the predetermined working position, and prepare for rope threading operation.

[0045] Pull the movable end of the rope 7 so that the rope 7 passes through the bottom of the clamping structure 6 along the guide direction of the flow guide 62. At this time, one end of the rope 7 passes through the arc-shaped metal ring 69 and the support ring 68 in sequence, and continues to extend to the position of the placement plate 5.

[0046] After the rope is threaded, the operator can rotate the drive ring 64 through the ring 65. The drive ring 64 drives the sleeve 63 to rotate, and then through the linkage between the connecting ring 67 and the support ring 68, the support ring 68 is displaced, adjusting the clamping force of the arc-shaped metal ring 69. When the elastic deformation of the arc-shaped metal ring 69 reaches an appropriate level, the rope 7 is firmly clamped in the predetermined position, completing the positioning.

[0047] The end of the rope 7, which passes through the clamping structure 6 and extends to the placement plate 5, is bent and wrapped along the outside of the placement plate 5, and then the end is knotted with the main body of the rope 7 to form a knot 8.

[0048] Cut the knotted rope 7 to obtain a semi-finished product with a knot 8 and an end to be processed. Before or after cutting, the end of the rope 7 can be disassembled as needed to spread the end fibers and form a divergent rope head 9, thus finally obtaining a complete knot temporary plugging agent structure.

[0049] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A knotting device for a temporary knot sealant, characterized in that, include: The body (1) has an L-shaped structure; Cylinder (2) is fixedly installed on the end face of the machine body (1); The lifting plate (3) is installed on the movable end of the cylinder (2). The lifting plate (3) is composed of a mounting plate, a pneumatic piston and a positioning plate. The mounting plate is fixedly installed on the movable end of the cylinder (2). The pneumatic piston is installed on the end of the mounting plate. Two positioning plates are installed on the movable end of the pneumatic piston. The support column (4) is disposed between the two positioning plates and is movably connected to the lifting plate (3); The placement plate (5) is fixedly installed on one end face of the body (1); The clamping structure (6) is fixedly installed inside the lifting plate (3) and is used to clamp and position the rope cutting part.

2. The knotting device for a temporary knot sealant according to claim 1, characterized in that, The clamping structure (6) includes: An arc-shaped plate (61) is fixedly installed on a positioning plate inside the lifting plate (3). A circular hole is provided in the middle of the arc-shaped plate (61), and a fixing ring is integrally formed at the bottom end of the arc-shaped plate (61), which is equal to the inner diameter of the circular hole. The air deflector (62) is fixedly installed on the top of the arc plate (61) and located at the edge of the circular hole; Mounting cover (611) is fixedly installed on the outside of the fixing ring of the arc plate (61); The round sleeve (63) is threadedly connected to the bottom edge of the inner wall of the mounting cover (611); The drive ring (64) is welded to the bottom of the outer surface of the circular sleeve (63); Multiple rings (65) are fixedly installed on the top end of the drive ring (64); A connecting ring (67) is fixedly installed on the bottom of the inner wall of the circular sleeve (63); A support ring (68) is sleeved on the outside of the connecting ring (67), and a circular groove (66) that fits the connecting ring (67) is provided inside the support ring (68). A column (610) is provided through the top end of the support ring (68), and the column (610) is fixedly connected to the mounting cover (611); An arc-shaped metal ring (69) is fixedly connected between the top edge of the support ring (68) and the inner wall edge of the mounting cover (611), with the curved part facing the center of the support ring (68).

3. The knotting device for a temporary knot sealant according to claim 2, characterized in that, The connecting ring (67) and the supporting ring (68) are rotatably connected through the circular groove (66).

4. The knot-tying device for a temporary knot sealant according to claim 3, characterized in that, The arc-shaped metal ring (69) is a thin metal sheet structure with elasticity, which is used to deform when the support ring (68) is displaced.

5. A knot-sealing agent structure, characterized in that, The knotting device for the temporary knotting agent as described in claim 4 is used to prepare the temporary knotting agent structure, which includes: a rope body (7). The knot (8) is formed by winding the rope body (7), and the knot (8) is a single rope knot; The rope end (9) is formed by disassembling the end of the rope body (7) away from the knot (8), and the rope end (9) is distributed in a radiating manner.

6. The knot-sealing agent structure according to claim 5, characterized in that, The rope body (7), the knot (8) and the rope end (9) are all made of biodegradable PBS plastic material.

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