A plugging and retaining integrated device for oil and gas wells

Abstract

The application relates to the technical field of oil and gas well sealing, and discloses an integrated sealing and retaining device for oil and gas wells, which comprises a center rod and a slip assembly, and the slip assembly comprises an adjusting piece, a plurality of mounting seats and a plurality of supporting rollers. The plurality of mounting seats are arranged around the center rod and are slidably assembled on the side surface of the center rod along the radial direction of the center rod. The supporting rollers are rotationally assembled on the corresponding mounting seats, the rotation axes of the supporting rollers are parallel to the central axis of the center rod, and the plurality of supporting rollers are arranged in the same annular surface. The adjusting piece is matched with the mounting seat and is used for adjusting the radial position of the mounting seat relative to the center rod. The adjusting piece adjusts the outer contour diameter formed by the plurality of supporting rollers by driving the radial displacement of the mounting seat, so that the outer contour diameter is matched with the inner diameter of a target wellbore. The integrated sealing and retaining device for oil and gas wells can improve the positioning accuracy of the center rod and effectively ensure the sealing effect of subsequent sealing operations.

Description

Technical Field

[0001] This invention relates to the technical field of oil and gas well plugging, and specifically to an integrated plugging and retention device for oil and gas wells. Background Technology

[0002] The integrated oil and gas well plugging and retention device is a specialized downhole operation device that integrates the functions of wellbore plugging, wellbore bearing, and retention protection. It integrates the traditionally scattered plugging components with the load-bearing and retention fixing structures into a single design. It can simultaneously complete the effective plugging of the target well section and the reliable support and permanent or semi-permanent well retention of the device itself in a single running operation, without the need for multi-step operation. This effectively improves the efficiency and sealing of oil and gas well plugging operations, while meeting engineering requirements such as wellbore pressure bearing, anti-channeling, and compatibility with subsequent operations. It is mainly used in downhole engineering scenarios such as abandoned plugging of oil and gas wells, casing repair, and leakage control.

[0003] A cement retainer is disclosed in patent document CN110080715B, which includes a central tube. One end of the central tube is fixedly connected to a lower connector. A sealing anchoring structure is sleeved around the central tube. One end of the sealing anchoring structure abuts against the lower connector. A push ring is provided between the other end of the sealing anchoring structure and the other end of the central tube. One-way valves are respectively provided at both ends of the central tube. When the one-way valves are in the open state, the insertion tube for sealing grout injection passes through the one-way valves and the lower connector.

[0004] During setting, the adapter in the setting tool is connected to one end of the central tube. Simultaneously, the insertion tube for grout injection is inserted into the central tube and extends beyond the lower connector. When the cement retainer reaches the set position, grout injection is performed directly through the insertion tube. After grout injection is completed, the insertion tube is retrieved. After the insertion tube leaves the cement retainer, all one-way valves close, creating a blind plug inside, allowing for bidirectional pressure.

[0005] However, this solution also has the following problems: Under different pipeline internal environments, during the lowering process of the retainer, due to the limited clearance between its own structural dimensions and the pipeline inner diameter, coupled with objective working conditions such as local protrusions, scaling, corrosion, and casing deformation on the inner wall of the wellbore, as well as the influence of dynamic factors such as fluid disturbance and tubing sway during the lowering process, the retainer is prone to continuous contact friction with the pipeline inner wall. This friction leads to uneven stress on the retainer, which directly causes the retainer to shift. This shift significantly reduces its positioning accuracy in the preset well section, causing the retainer to fail to set precisely in the designed position. This problem not only directly affects the sealing performance and load-bearing stability of subsequent plugging operations, but may also cause a series of failures such as setting failure, incomplete plugging, and wellbore leakage, ultimately seriously affecting the overall effect of wellbore plugging. Summary of the Invention

[0006] This invention provides an integrated plugging and retention device for oil and gas wells, aiming to solve the problem in related technologies where the retention device easily rubs against the inner wall of the pipeline during lowering, resulting in a decrease in positioning accuracy and thus affecting the plugging effect.

[0007] The present invention relates to an integrated plugging and retaining device for oil and gas wells, comprising a central rod and a slip assembly mounted on the outside of the central rod. The slip assembly includes an adjusting component, multiple mounting seats, and multiple support rollers. The multiple mounting seats are arranged around the central rod and are slidably mounted on the side wall of the central rod radially. The support rollers are rotatably mounted on corresponding mounting seats, and each mounting seat is equipped with at least one support roller. The rotation axis of the support rollers is parallel to the axis of the central rod, and the multiple support rollers are arranged together in the same annular surface. The adjusting component cooperates with the mounting seats to adjust the radial position of the mounting seats relative to the central rod. The adjusting component drives the mounting seats to radially displace, thereby adjusting the outer contour diameter formed by the multiple support rollers and adapting the outer contour diameter to the inner diameter of the target wellbore to provide radial support for the central rod.

[0008] The effect lies in the fact that by arranging multiple support rollers on the outside of the central rod, effective constraint and positioning support are achieved during the lowering process of the central rod. During the lowering of the central rod along the shaft axis, the support rollers form a stable contact relationship with the inner wall of the shaft. Relying on the lateral support of the support rollers, the radial displacement of the central rod is effectively constrained, preventing deviations such as skewing or shaking within the shaft, thereby significantly improving the positioning accuracy of the central rod within the shaft. Specifically, before the formal lowering operation, the installation position of each support roller needs to be precisely adjusted according to the actual inner diameter of the shaft using preset adjustment components. This drives multiple support rollers to move synchronously away from the central rod until the outer contour dimension formed by the outer side of each support roller matches the inner diameter of the shaft, ensuring that the support rollers can form a uniform and reliable contact with the inner wall of the shaft. After adjustment, as the center rod moves axially within the wellbore, the support rollers continuously provide uniform lateral support force to the center rod, preventing any deviation or tilting during the lowering process. This ensures stable and reliable positioning accuracy of the center rod, laying a solid foundation for subsequent wellbore plugging operations and effectively improving the overall plugging effect.

[0009] Preferably, the adjusting component includes an adjusting ring and a pushing ring. The pushing ring is slidably sleeved on the outside of the central rod. The side of the pushing ring near the mounting base has an inclined pushing surface that abuts against the inner side of the mounting base. The adjusting ring is rotatably assembled on the central rod and sleeved on the outside of the pushing ring. The inner side of the adjusting ring has a first threaded engagement portion, and the outer side of the pushing ring has a second threaded engagement portion. The first threaded engagement portion and the second threaded engagement portion form a threaded engagement. When the adjusting ring rotates relative to the central rod, it drives the pushing ring to move along the axial direction of the central rod towards the mounting base. The inclined pushing surface of the pushing ring interacts with the inner side of the mounting base, pushing the mounting base away from the central rod.

[0010] Its effect is that when the position of the support roller needs to be adjusted, the adjusting ring can be manually rotated, and the threaded engagement drives the pushing ring to produce axial displacement; the pushing ring moves towards the mounting seat, and through the inclined push surface on it, it forms a cooperating transmission with the mounting seat, driving the mounting seat to produce corresponding displacement, and finally realizing the position adjustment of the support roller.

[0011] Preferably, the slip assembly further includes a slip sleeve fixedly fitted outside the center rod. A first cone and a second cone are slidably disposed between the slip sleeve and the mounting base. The first cone forms a mating structure with the inner side of the mounting base, and the second cone forms a mating structure with the inner side of the slip sleeve. When the first cone and the second cone move away from each other along the sliding direction, the first cone pushes the mounting base to generate displacement, causing the mounting base to drive the support roller to engage with the inner wall of the wellbore. The second cone drives the slip sleeve to generate an opening action, causing the slip sleeve to engage with the inner wall of the wellbore, thereby fixing the center rod through the support roller and the slip sleeve.

[0012] Its effect is that after the center rod moves to the designated position, the first cone and the second cone move synchronously in opposite directions, which can fix the center rod by the support roller and the slip sleeve respectively, so as to carry out subsequent sealing.

[0013] Preferably, the push ring is located at the end of the mounting base away from the first cone.

[0014] Its effect is to avoid motion interference between the push ring and the first cone.

[0015] Preferably, the support roller is made of rubber. When the first cone drives the support roller to move towards the inner wall of the well, the support roller undergoes elastic deformation to increase the contact area with the inner wall of the well.

[0016] Its effect is that when the center rod is finally fixed, the support roller can move closer to the wellbore and undergo elastic deformation under the action of the first cone, increasing the contact area between the support roller and the inner wall of the wellbore and improving the stability of their cooperation.

[0017] Preferably, the mounting base includes a mounting part and a support part. The mounting part cooperates with the center rod, and the support part is located on the side of the mounting part away from the center rod. The side of the support part near the inner wall of the well barrel is an arc-shaped support surface. The mounting base abuts against the inner wall of the well barrel through the arc-shaped support surface to assist in supporting the center rod.

[0018] Preferably, the support part is provided with a slide groove, and a slider is slidably assembled inside the slide groove in the direction toward the central rod. The support roller and the slider are rotatably engaged. An elastic element that cooperates with the slider is provided inside the slide groove. The elastic element is used to drive the slider to move away from the mounting part.

[0019] Preferably, multiple friction strips are provided on the arc-shaped support surface, and the multiple friction strips are arranged along the length direction of the central rod on the arc-shaped support surface.

[0020] Preferably, the inclined pushing surface is continuously arranged around the circumference of the pushing ring, and the inclined pushing surface simultaneously abuts against the inner side of multiple mounting seats to achieve synchronous pushing action.

[0021] Preferably, the side of the support roller is provided with multiple support protrusions evenly distributed.

[0022] Beneficial effects:

[0023] This invention, by setting up support rollers and controlling the rotation amplitude of the adjusting ring, can precisely adjust the outer circumferential dimensions of multiple support rollers, ensuring their outer diameter accurately matches the inner diameter of the wellbore. After matching, the outer circumferential surface of the support rollers rolls in close contact with the inner wall of the wellbore, providing uniform radial support for the central rod. This avoids direct sliding friction between the central rod and the inner wall of the wellbore, reducing component wear, and simultaneously restricts the radial movement and tilting of the central rod, ensuring its stable downward movement along the central axis of the wellbore. This support and guiding structure ensures the precise lowering path of the central rod, allowing it to smoothly reach the preset position, laying the foundation for subsequent sealing operations and improving the overall sealing effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the first cone and the second cone in this invention.

[0026] Figure 3 This is a schematic diagram of the adjusting component in this invention.

[0027] Figure 4 This is a partial exploded view of the mounting base and the push ring in this invention.

[0028] Figure 5 This is a schematic diagram of the structure of multiple mounting bases in this invention.

[0029] Figure 6This is a schematic diagram of the cooperation relationship between the mounting base and the support roller in this invention.

[0030] Figure 7 This is a schematic diagram of the friction strip in this invention.

[0031] Figure 8 This is a schematic diagram of the slide groove in this invention.

[0032] Figure label:

[0033] 1. Center rod; 2. Mounting seat; 21. Mounting part; 22. Support part; 3. Support roller; 31. Support protrusion; 4. Adjusting component; 41. Adjusting ring; 411. First threaded mating part; 42. Pushing ring; 421. Inclined push surface; 422. Second threaded mating part; 5. Slip sleeve; 6. First cone; 7. Second cone; 8. Arc-shaped support surface; 81. Friction strip; 9. Slide groove; 91. Slider; 92. Elastic component. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figures 1 to 8 As shown, the integrated plugging and retaining device for oil and gas wells of the present invention includes a central rod 1 and a slip assembly coaxially mounted on its exterior. A conical structure that cooperates with the slip assembly is installed on the outer peripheral wall of the central rod 1.

[0036] In actual operation, the central rod 1 of the entire device is first smoothly lowered into the preset sealing position inside the oil and gas wellbore using the lifting and lowering equipment. Then, the cone is controlled by the preset drive mechanism to move linearly along the axis of the central rod 1. The drive mechanism adopts a conventional setting in this field, and its specific structure will not be described in detail here. The movement of the cone cooperates with the slip assembly, causing the slip assembly to fit tightly against the inner wall of the wellbore, thereby firmly limiting the central rod 1 in the preset position and effectively preventing the central rod 1 from axial movement or radial displacement during subsequent sealing operations. After the central rod 1 is reliably fixed by the cooperation of the slip assembly and the cone, the subsequent wellbore sealing execution mechanism is activated to complete the precise sealing operation of the oil and gas wellbore, ensuring the stability and sealing of the sealing process.

[0037] Reference Figure 1 , Figure 2The slip assembly includes an upper slip assembly and a lower slip assembly, which are spaced apart along the axial direction of the central rod 1. The conical structure is correspondingly divided into a first cone 6 and a second cone 7, where the first cone 6 is adapted to the upper slip assembly, and the second cone 7 is adapted to the lower slip assembly. Both the first cone 6 and the second cone 7 are arranged within the axial range between the upper and lower slip assemblies. When the device needs to fix the central rod 1, the first cone 6 and the second cone 7 move synchronously in opposite directions along the axis of the central rod 1, driving the upper and lower slip assemblies to form a tight fit with the inner wall of the oil and gas wellbore. Through dual-point positioning constraints, the central rod 1 is stably fixed within the wellbore.

[0038] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 The upper slip assembly includes: an adjusting component 4, a mounting base 2, and a support roller 3. Multiple mounting bases 2 and support rollers 3 are provided. Multiple mounting bases 2 are evenly arranged around the center rod 1 in the circumference, and each mounting base 2 is slidably mounted on the side of the center rod 1 in the radial direction. Each mounting base 2 is provided with at least one support roller 3. The support roller 3 is rotatably connected to the mounting base 2. In this embodiment, a single mounting base 2 and a single support roller 3 are used, that is, each support roller 3 is rotatably mounted on each mounting base 2 in a one-to-one correspondence. The rotation axis of the support roller 3 is parallel to the central axis of the center rod 1. At the same time, multiple sets of support rollers 3 converge to form the same annular surface structure to ensure the force balance when the support roller 3 contacts the inner wall of the well. The adjusting component 4, as the core adjusting component, works in conjunction with each mounting base 2. Its core function is to drive the mounting base 2 to move radially along the central rod 1. Through this displacement adjustment, multiple sets of support rollers 3 are driven to move radially and extend synchronously, thereby changing the outer contour diameter formed by the multiple sets of support rollers 3. This allows the outer contour diameter to be precisely matched with the inner diameter of the target wellbore of oil and gas wells of different specifications, thus forming a reliable radial support and positioning for the central rod 1.

[0039] In actual operation, by adjusting the radial position of each mounting seat 2 through the adjusting component 4, the support roller 3 can form contact with the inner wall of the well when the central rod 1 is lowered into the well. This contact not only provides effective auxiliary support for the central rod 1, suppresses the radial displacement of the central rod 1 in the well, ensures the stability of the lowering process, and guarantees the positioning accuracy after being lowered to the designated position, thus improving the subsequent sealing effect; at the same time, considering the possible rotation of the central rod 1 during the lowering process, since the support roller 3 adopts a rotating assembly form, the sliding friction between it and the inner wall of the well can be converted into rolling friction, which can significantly reduce the frictional resistance when the central rod 1 rotates, reduce the wear on the inner wall of the well and the support roller 3 itself, and further improve the smoothness and service life of the device operation process.

[0040] Reference Figure 5 , Figure 6 Multiple support protrusions 31 are evenly distributed on the side of the support roller 3, ensuring a regular and symmetrical distribution of the protrusions 31 in both the circumferential and axial directions, thus preventing force imbalance caused by uneven distribution. These support protrusions 31, together with the support roller 3, contact the inner wall of the wellbore, forming a multi-point contact engagement and creating a stronger frictional constraint. During the process of the support roller 3 providing radial support to the central rod 1, the greater frictional force effectively reduces the possibility of displacement or swaying of the central rod 1 during operation, further improving the stability and reliability of the support for the central rod 1.

[0041] Reference Figure 3 , Figure 4 The adjusting component 4 is assembled on the central rod 1. The adjusting component 4 includes an adjusting ring 41 and a pushing ring 42. The pushing ring 42 is slidably fitted onto the outside of the central rod 1, forming an assembly relationship in which they can slide relative to each other along the axis of the central rod 1. The end face of the pushing ring 42 facing the mounting base 2 is machined with a sloping push surface 421 that is adapted to the inner wall surface of the mounting base 2. After assembly, this sloping push surface 421 forms a stable abutting fit with the inner part of the mounting base 2, providing a force transmission basis for subsequent position adjustment. The adjusting ring 41 is rotatably assembled on the central rod 1 and can rotate circumferentially around the axis of the central rod 1. At the same time, the adjusting ring 41 is fitted onto the outside of the pushing ring 42, forming an inner and outer nested assembly structure. The two are connected by a threaded structure. Specifically, the inner wall of the adjusting ring 41 is provided with a first threaded engagement portion 411, and the outer wall of the pushing ring 42 is provided with a corresponding second threaded engagement portion 422. The first threaded engagement portion 411 and the second threaded engagement portion 422 mesh with each other to form a precise threaded transmission pair, ensuring that the rotational motion of the adjusting ring 41 can be stably transmitted to the pushing ring 42.

[0042] Before placing the center rod 1, the operator manually applies a rotational force to the adjusting ring 41, causing it to rotate circumferentially around the center rod 1. Based on the threaded transmission relationship between the adjusting ring 41 and the pushing ring 42, the rotational motion of the adjusting ring 41 is converted into the linear motion of the pushing ring 42, which in turn drives the pushing ring 42 to move smoothly towards the side closer to the mounting base 2 along the axial direction of the center rod 1. As the pushing ring 42 moves axially, the inclined push surface 421 at its end continuously interacts with the inner wall of the mounting base 2. Since the inclined push surface 421 has a specific inclination angle, as the pushing ring 42 gradually approaches the mounting base 2, the inclined push surface 421 will successively form contact with different positions on the inner side of the mounting base 2. Through the geometric characteristics of the inclined surface, the thrust along the axial direction of the center rod 1 is decomposed into a radial force perpendicular to the axial direction of the center rod 1. This radial force continuously acts on the mounting base 2, pushing the entire mounting base 2 to move away from the center rod 1. By controlling the rotation angle and number of rotations of the adjusting ring 41, the axial movement distance of the pushing ring 42 can be controlled, thereby adjusting the position of the mounting base 2 relative to the center rod 1.

[0043] The inclined push surface 421 is continuously arranged around the circumference of the push ring 42. Combined with the coaxial sleeve assembly relationship between the push ring 42 and the central rod 1, the symmetry of the structure and the uniformity of force distribution can be fully guaranteed. The push ring 42 is sleeved on the outside of the central rod 1 in a coaxial manner, and the two maintain strict concentricity. This allows the circumferentially continuously distributed inclined push surface 421 to form a stable abutment fit with the inner side of multiple mounting seats 2 arranged around the central rod 1 in the assembled state. The inner wall surface of multiple mounting seats 2 can be uniformly fitted with the continuous inclined push surface 421.

[0044] When the push ring 42 is displaced along the axial direction of the central rod 1 under the action of transmission, the circumferentially continuous inclined push surface 421 will simultaneously apply a uniform radial pushing force to all the mounting seats 2 that it abuts. The axial movement of the inclined push surface 421 is converted into a consistent radial driving force on each mounting seat 2, ensuring that the magnitude and timing of the pushing force borne by each mounting seat 2 are completely synchronized. This will drive all the mounting seats 2 to move away from the central rod 1 in the same direction with the same displacement trend, avoiding the situation where the action of a single or part of the mounting seats 2 is lagging or the displacement is inconsistent, and finally achieving the synchronous adjustment of the positions of multiple mounting seats 2.

[0045] Reference Figure 1 , Figure 2The lower locking assembly includes a locking sleeve 5 fixedly fitted outside the central rod 1. A first cone 6 and a second cone 7 are slidably disposed between the locking sleeve 5 and the mounting base 2. Both can slide relative to each other along a preset sliding direction. The outer contour of the first cone 6 is adapted to the inner wall of the mounting base 2, enabling stable force transmission under load. The outer contour of the second cone 7 forms a corresponding mating structure with the inner wall of the locking sleeve 5, and their contact surfaces also fit closely, ensuring effective force transmission.

[0046] After the center rod 1 is lowered to the designated position inside the wellbore, the first cone 6 and the second cone 7 are controlled to move away from each other along their common sliding direction. The first cone 6 applies a directional thrust to the mounting base 2 through its mating contact surface with the inner side of the mounting base 2. This thrust drives the mounting base 2 to displace in a set direction. During the displacement process, the mounting base 2 synchronously drives the support roller 3 connected to it to change position, so that the support roller 3 is tightly fitted with the inner wall of the wellbore, forming a reliable radial support fit. At the same time, during the mutual moving away process, the second cone 7 applies a corresponding force to the slip sleeve 5 through its mating structure with the inner side of the slip sleeve 5. This force causes the slip sleeve 5 to radially open, so that the outer working surface of the slip sleeve 5 gradually expands and tightly abuts against the inner wall of the wellbore, forming a stable radial clamping fit. With the support roller 3 forming a support fit with the inner wall of the well shaft and the slip sleeve 5 forming a clamping fit with the inner wall of the well shaft, the two work together to build a stable radial fixing system, which ultimately achieves reliable fixing of the center rod 1, ensuring that the center rod 1 remains in a stable position during operation and does not experience radial offset or axial movement.

[0047] During the lowering of the center rod 1, the support roller 3 initially forms a contact with the inner wall of the well casing. This contact provides basic radial support for the center rod 1, effectively restraining its radial sway and ensuring its overall stability during lowering. When the first cone 6 displaces along a preset direction, it continuously transmits a directional force to the mounting base 2 through its mating structure. This drives the mounting base 2 to move the support roller 3 further towards the inner wall of the well casing, increasing the contact force between the support roller 3 and the inner wall and making their contact tighter. This strengthens the radial support effect of the support roller 3 on the center rod 1. Simultaneously, because the support roller 3 is parallel to the center rod 1, its side has a larger contact area with the side wall of the well casing, improving the stability of the center rod 1.

[0048] The push ring 42 is mounted on the end of the mounting base 2 away from the first cone 6, so that the push ring 42 and the first cone 6 are spatially separated. The two will not interfere with each other or conflict with each other during their respective strokes, ensuring that the push ring 42 and the first cone 6 can complete their respective actions independently without affecting the normal realization of their respective functions.

[0049] During the preparation stage before the center rod 1 is lowered into the wellbore, the assembly position or axial positioning state of the center rod 1 relative to the mounting base 2 can be changed by operating the push ring 42. This adjusts the initial position of the mounting base 2, ensuring that the radial support range formed by the support roller 3 matches the actual inner diameter of the target wellbore, thus preventing the center rod 1 from shifting during movement. When the center rod 1 needs to be positioned and fixed during operation, there is no need to adjust it using the push ring 42. Instead, the directional movement of the first cone 6 acts on the mounting base 2 again, driving it to shift and achieving a secondary adjustment of the mounting base 2's position. This further adjusts the radial extension of the support roller 3, ensuring that the support roller 3 is in close contact with the inner wall of the wellbore, thus reliably fixing the center rod 1.

[0050] The support roller 3 is made of rubber. Before the first cone 6 moves, its side is already in contact with the inner wall of the well. When the first cone 6 drives the support roller 3 toward the inner wall of the well and performs a secondary adjustment on the position of the mounting seat 2, the support roller 3 will move further toward the inner wall of the well. During this process, the rubber support roller 3 can produce corresponding elastic deformation and further fit with the inner wall of the well, thereby effectively increasing the contact area with the inner wall of the well and ultimately achieving a significant improvement in the overall stability of the center rod 1.

[0051] The support roller 3 can be made entirely of rubber, or a layer of rubber can be laminated to its sidewalls to achieve the corresponding function.

[0052] The support roller 3 is made of heat-resistant rubber with specific hardness. When subjected to extrusion pressure, it can generate controllable elastic deformation, which effectively increases the contact area with the inner wall of the sleeve, thereby improving the overall fixing strength and assembly stability. Considering that the working environment temperature in the oil and gas well plugging area can reach over 200℃, it is necessary to select special rubber with excellent heat resistance and high hardness, such as fluororubber, silicone rubber and hydrogenated nitrile rubber. Such rubber materials can maintain stable physical and mechanical properties and structural strength under high temperature conditions, and can also meet the requirements of extrusion deformation and increased contact area to ensure the fixing effect.

[0053] Reference Figure 6 , Figure 7 , Figure 8The mounting base 2 is integrally formed by the mounting part 21 and the support part 22. The mounting part 21 cooperates with the center rod 1, and the support part 22 is located on the side of the mounting part 21 away from the center rod 1. The side of the support part 22 that is close to the inner wall of the well is set as an arc-shaped support surface 8. The mounting base 2 abuts against the inner wall of the well through the arc-shaped support surface 8 to achieve auxiliary support for the center rod 1.

[0054] After the secondary adjustment of the position of the support roller 3 is completed, the rubber support roller 3 undergoes controllable elastic deformation under the action of external force. After deformation, the support roller 3 forms a complete and tight contact with the inner wall of the well. During the deformation of the support roller 3, the arc-shaped support surface 8 moves closer to the inner wall of the well. After the arc-shaped support surface 8 moves to contact the inner wall of the well, the mounting base 2 stops moving. By setting the arc-shaped support surface 8 and the support roller 3 to work together, a uniform and stable radial constraint force is applied to the center rod 1 in different support forms, which further enhances the positioning effect of the center rod 1 in the well and significantly improves the overall stability and working reliability of the center rod 1 during downhole operations.

[0055] Reference Figure 6 , Figure 7 , Figure 8 Several horizontally arranged friction strips 81 are provided on the arc-shaped support surface 8 of the mounting base 2. That is, multiple friction strips 81 are arranged along the length direction of the central rod 1 on the arc-shaped support surface 8. When the arc-shaped support surface 8 abuts against the inner wall of the well, these horizontally arranged friction strips 81 can effectively increase the contact friction between the arc-shaped support surface 8 and the inner wall of the well. By enhancing the friction between the two, the overall support and positioning effect is strengthened.

[0056] Reference Figure 6 , Figure 7 , Figure 8 The support part 22 is provided with a slide groove 9, and a slider 91 that can slide along the direction towards the center rod 1 is installed inside the slide groove 9. The support roller 3 and the slider 91 are installed in a rotational engagement manner. An elastic element 92 adapted to the slider 91 is also provided inside the slide groove 9. The elastic element 92 is a spring. One end of the spring abuts against the inner wall end face of the slide groove 9, and the other end abuts against the slider 91. Its preset elastic force direction is to drive the slider 91 to move along the slide groove 9 in a direction away from the mounting part 21, so that the slider 91 and the support roller 3 always maintain the initial position away from the mounting part 21 when not in working adjustment state, so as to reserve sufficient displacement space for subsequent adjustment actions.

[0057] When the first cone 6 performs a secondary adjustment operation on the position of the support roller 3, the force applied by the first cone 6 first acts on the support roller 3. Under the action of this external force, the support roller 3 produces a corresponding elastic deformation and transmits the external force to the slider 91 that cooperates with it. This forces the slider 91 to overcome the preset elastic force of the elastic element 92 and slide in a direction along the groove 9 toward the center rod 1. During this sliding process, the slider 91 continuously compresses the spring, causing the spring to accumulate elastic potential energy. The support roller 3 also moves synchronously toward the mounting part 21 along with the slider 91.

[0058] As the support roller 3 approaches and comes into contact with the mounting part 21, it is confined within the clamping space formed by the mounting part 21 and the inner wall of the well. Under the combined action of bidirectional extrusion, the outer circumferential surface of the support roller 3 can closely adhere to the inner wall of the well, achieving full and close contact between the support roller 3 and the inner wall of the well. This improves the support structure's stability and stress uniformity in supporting the well, ensuring the reliability of the support operation.

[0059] After the support adjustment is completed and the fixing constraints on the relevant components are released, driven by the elastic restoring force of the elastic element 92, the slider 91 is pushed to move in the opposite direction along the slide groove 9, that is, in the direction away from the center rod 1 and back to the initial position. The slider 91 then drives the support roller 3 to complete the reset action simultaneously, so that the support roller 3 moves back to the initial set position and completely separates from the mounting part 21, releasing the squeezing fit between the two. In this way, the support roller 3 and the slider 91 return to the initial working standby state, and can once again smoothly play the auxiliary support function during the subsequent operation of lowering the center rod 1, ensuring that the entire support mechanism can cyclically and stably complete the support and reset operations, meeting the needs of continuous operation.

[0060] The implementation principle of this invention is as follows: When lowering the center rod 1, the adjusting ring 41 is manually rotated. The adjusting ring 41 drives the pushing ring 42 to move outside the center rod 1. While moving, the pushing ring 42 pushes the mounting base 2 and the support roller 3 to move away from the center rod 1, so that the outer diameter of the multiple support rollers 3 matches the inner diameter of the well barrel. When lowering the center rod 1, the support rollers 3 cooperate with the inner wall of the well barrel to support the center rod 1, avoiding friction between the center rod 1 and the inner wall of the well barrel during lowering, thereby avoiding the phenomenon of deviation, ensuring the accuracy when lowering to the designated position, and improving the subsequent sealing effect.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An integrated plugging and retaining device for oil and gas wells, comprising a center rod and slip components assembled outside the center rod, characterized in that, The slip assembly includes: an adjusting component, multiple mounting seats, and multiple support rollers; the multiple mounting seats are arranged around a central rod and slidably mounted on the side of the central rod radially; the support rollers are rotatably mounted on corresponding mounting seats, each mounting seat is equipped with at least one support roller, the rotation axis of the support rollers is parallel to the central axis of the central rod, and the multiple support rollers are arranged together in the same annular surface; the adjusting component cooperates with the mounting seats to adjust the radial position of the mounting seats relative to the central rod; the adjusting component drives the radial displacement of the mounting seats to adjust the outer contour diameter formed by the multiple support rollers, and adapts the outer contour diameter to the inner diameter of the target wellbore to provide radial support for the central rod; The adjusting component includes an adjusting ring and a pushing ring. The pushing ring is slidably sleeved on the outside of the central rod. The side of the pushing ring near the mounting base has an inclined pushing surface that abuts against the inner side of the mounting base. The adjusting ring is rotatably assembled on the central rod and sleeved on the outside of the pushing ring. The inner side of the adjusting ring has a first threaded engagement part, and the outer side of the pushing ring has a second threaded engagement part. The first threaded engagement part and the second threaded engagement part form a threaded engagement. When the adjusting ring rotates relative to the central rod, it drives the pushing ring to move along the axial direction of the central rod towards the mounting base. The inclined pushing surface of the pushing ring interacts with the inner side of the mounting base, pushing the mounting base to move away from the central rod. It also includes a slip sleeve fixedly fitted outside the center rod. A first cone and a second cone are slidably arranged between the slip sleeve and the mounting base. The first cone forms a mating structure with the inner side of the mounting base, and the second cone forms a mating structure with the inner side of the slip sleeve. When the first cone and the second cone move away from each other along the sliding direction, the first cone pushes the mounting base to produce displacement, causing the mounting base to drive the support roller to engage with the inner wall of the wellbore. The second cone drives the slip sleeve to produce an opening action, causing the slip sleeve to engage with the inner wall of the wellbore. Thus, the center rod is fixed by the support roller and the slip sleeve.

2. The integrated plugging and retention device for oil and gas wells according to claim 1, characterized in that, The push ring is located at the end of the mounting base opposite to the first cone.

3. The integrated plugging and retention device for oil and gas wells according to claim 1, characterized in that, The support roller is made of rubber. When the first cone drives the support roller to move towards the inner wall of the well, the support roller undergoes elastic deformation to increase the contact area with the inner wall of the well.

4. The integrated plugging and retention device for oil and gas wells according to claim 1, characterized in that, The mounting base includes a mounting section and a support section. The mounting section cooperates with the center rod, and the support section is located on the side of the mounting section away from the center rod. The side of the support section closest to the inner wall of the well barrel is an arc-shaped support surface. The mounting base abuts against the inner wall of the well barrel through the arc-shaped support surface to assist in supporting the center rod.

5. The integrated plugging and retention device for oil and gas wells according to claim 4, characterized in that, The support part is provided with a slide groove, and a slider is slidably assembled inside the slide groove in the direction toward the center rod. The support roller and the slider rotate in cooperation. An elastic element that cooperates with the slider is provided inside the slide groove. The elastic element is used to drive the slider to move away from the mounting part.

6. The integrated plugging and retention device for oil and gas wells according to claim 4, characterized in that, Multiple friction strips are provided on the arc-shaped support surface, and the multiple friction strips are arranged along the length of the central rod on the arc-shaped support surface.

7. The integrated plugging and retention device for oil and gas wells according to claim 1, characterized in that, The inclined pushing surface is continuously arranged around the circumference of the pushing ring, and the inclined pushing surface simultaneously abuts against the inner side of multiple mounting seats to achieve synchronous pushing action.

8. The integrated plugging and retention device for oil and gas wells according to claim 1, characterized in that, Multiple support protrusions are evenly distributed on the side of the support roller.

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