Embedded spiral ball casing centralizer and use method

Abstract

The invention relates to the technical field of oil casing connection, and particularly discloses an embedded spiral ball casing centralizer and a using method.The embedded spiral ball casing centralizer comprises an outer sleeve, casings are arranged at the top and the bottom of the outer sleeve correspondingly, the ends, close to the outer sleeve, of the casings extend into the outer sleeve and communicate with the outer sleeve, and a supporting structure is arranged on the outer surface of the outer sleeve; the side, away from the outer sleeve, of the supporting structure extends to the outer sides of the two sleeves and makes contact with the surfaces of the sleeves, an adjusting structure corresponding to the supporting structure is arranged on the outer surface of the outer sleeve, and the adjusting structure can control the supporting structure to be opened and closed and connect the sleeves with the outer sleeve. The sleeve connecting function and the centralizing and supporting function are integrated, the adjusting structure not only controls opening and closing of the supporting structure, but also can actively connect the sleeve and the outer sleeve, the problem that the sleeve and the centralizer cannot be connected through the structure is solved, and the risk of liquid leakage caused by infirm connection is prevented in design.

Description

Technical Field

[0001] This invention relates to the field of oil casing connection technology, specifically to an embedded spiral ball bearing casing centralizer and its usage method. Background Technology

[0002] A casing centralizer is a mechanical device installed outside the casing string. Its core function is to ensure that the casing is centered in the wellbore, that is, to place the casing as centrally as possible in the wellbore. This is crucial for ensuring wellbore quality and long-term production safety. During cementing operations, cement needs to be injected into the annular space between the casing and the wellbore. If the casing is eccentric, the cement slurry will preferentially flow through the wider side, while there will be little or no cement slurry on the narrower side. The centralizer ensures that the casing is centered, thereby forming a cement ring of uniform thickness, effectively sealing the formation and preventing inter-layer flow.

[0003] For example, Chinese patent application number ZL202320547364.6, entitled "An Elastic Casing Centralizer," includes an elastic casing centralizer body. An elastic plate is provided on the inner wall of the elastic casing centralizer body. A housing is fixedly connected to all four sides of the elastic casing centralizer body. A guiding mechanism is provided on the inner wall of the housing. The guiding mechanism includes a connecting rod, a guide wheel, a connecting plate, a first spring, and a fixed seat. The connecting rod is movably connected to the inner wall of the housing. This elastic casing centralizer, by providing a guiding mechanism, facilitates user guidance when using the elastic casing centralizer body, increasing the guiding effect and smoothness of the body as it enters the wellbore, thus facilitating user operation and achieving the goal of increasing the smoothness of the elastic casing centralizer body during use.

[0004] However, the existing stabilizers have a relatively simple structure. They are generally directly sleeved on the surface of the pipe and the distance between the stabilizer and the well wall is controlled by an adjustable bracket. The casing and the stabilizer cannot be connected by a structure, which makes it easy for gaps to appear between the interlocking pipes and cause liquid leakage. Secondly, the contact area between the centralizer and the well wall is small, and it mainly relies on multiple rods on both sides for compression and fixation. The rods and the well wall are prone to swinging and tilting due to changes in the compression position, which further affects the support effect. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention aims to provide an embedded spiral ball sleeve centralizer and its usage method, which has the advantages of improving connection stability and ease of connection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an embedded spiral ball sleeve centralizer and its usage method, comprising an outer sleeve; the top and bottom of the outer sleeve are provided with sleeves, the end of the sleeve near the outer sleeve extends into the interior of the outer sleeve and communicates with each other, the outer surface of the outer sleeve is provided with a support structure, the side of the support structure away from the outer sleeve extends to the outside of the two sleeves respectively and contacts the surface of the sleeves, the outer surface of the outer sleeve is provided with an adjustment structure corresponding to the support structure, the adjustment structure can control the opening and closing of the support structure and connect the sleeves to the outer sleeve.

[0007] Preferably, the support structure includes a connecting plate fixedly connected to the outer surface of the outer sleeve. The number of connecting plates is several and they are evenly arranged around the sleeve. A shaft is inserted into both ends of the connecting plate. An extension rod is fixedly connected to both sides of the surface of the shaft. A clamping frame is fixedly connected to the side of the extension rod away from the shaft. The clamping frame is arranged around the outside of the sleeve and contacts the surface of the sleeve. The adjustment structure is located outside the connecting plate and can control the extension rods on both sides to swing and clamp the sleeve in sequence. A spring plate is fixedly connected to the inner side of the extension rod. The side of the spring plate away from the extension rod contacts the surface of the connecting plate. The spring plate is elastic and can push the extension rod to swing outward and reset.

[0008] Preferably, the surface of the clamping frame is provided with a hollow opening, and the inner side of the clamping frame is fixedly connected to movable blocks located on both sides of the hollow opening. The inner side of the movable blocks is movably connected to rollers through pins, the outer surface of the rollers is in contact with the outer surface of the sleeve, and the rollers are slidably connected to the sleeve.

[0009] Preferably, the adjustment structure includes a vertical plate fixedly connected to the outside of the connecting plate, an electric telescopic rod slidably connected inside the vertical plate, a push plate fixedly connected to the output end of the electric telescopic rod and the top of the electric telescopic rod body, force rods located outside the extension rods fixedly connected to both ends of the shaft, the push plate located outside the force rods, and a sliding wheel in contact with the force rods movably connected to the surface of the push plate via a pin shaft, a limit plate fixedly connected to the outside of the connecting plate, the side of the limit plate away from the connecting plate being sleeved on the surface of the output end of the electric telescopic rod and extending to the lower part of the bottom push plate, when the output end of the electric telescopic rod extends downward, it can carry the bottom push plate downward first, when the bottom push plate pushes the bottom force rod to swing and contact the limit plate, the output end of the electric telescopic rod can use the reverse support force to push the body to slide and rise inside the vertical plate until the push plate on the surface of the electric telescopic rod body contacts the top force rod.

[0010] Preferably, a support plate is fixedly connected to the outer side of the connecting plate, and connecting blocks are fixedly connected to both sides of the surface of the electric telescopic rod. A guide rod is fixedly connected to the surface of the connecting block. The side of the guide rod away from the connecting block passes through the support plate and is slidably connected to the support plate. A compression spring is sleeved on the surface of the guide rod between the connecting block and the support plate. The compression spring can store elastic force when the electric telescopic rod body rises and release it when the output end of the electric telescopic rod retracts.

[0011] Preferably, the inner part of the outer sleeve is provided with a plurality of fixing frames corresponding to the connecting plate. The fixing frames are sleeved around the connection between the two sleeves. A crossbeam is fixedly connected to the outer side of the fixing frame. The side of the crossbeam away from the fixing frame passes through the outer sleeve and the connecting plate in sequence and extends to the outer side of the connecting plate. The surface of the electric telescopic rod is provided with a linkage structure. The linkage structure can control the crossbeam to move inward when the electric telescopic rod body rises.

[0012] Preferably, the linkage structure includes a trapezoidal frame fixedly connected to the outside of the crossbeam, the bottom of the trapezoidal frame is set to be inclined, and a pressing block is fixedly connected to the inner side of the electric telescopic rod. The side of the pressing block away from the electric telescopic rod contacts the inclined surface of the trapezoidal frame. When the body of the electric telescopic rod rises, the pressing block can press the trapezoidal frame to make it carry the crossbeam to move inward.

[0013] Preferably, the surface of the outer casing is fixedly connected to brackets located on both sides of the connecting plate, and a swing arm is movably connected to the outer side of the brackets via a pin. A support leg is installed on the side of the swing arm away from the bracket, and the support leg can contact the well wall. The surface of the trapezoidal frame is provided with a driving structure, which can control the swing arm to swing and unfold when the trapezoidal frame moves.

[0014] Preferably, the drive structure includes side plates fixedly connected to both sides of the trapezoidal frame. A pull rod is fixedly connected to the side of the side plate away from the trapezoidal frame. A crank is fixedly connected to the outer side of the swing rod. The pull rod extends into the inside of the crank and is slidably connected to the crank on the side away from the side plate. During the movement of the trapezoidal frame into the outer casing, the pull rod can be carried by the side plates to slide synchronously. The pull rod slides inside the crank and uses the crank to carry the swing rod to swing and unfold around the pin shaft.

[0015] Preferably, an embedded spiral ball sleeve centralizer and its usage method include the following steps: S1: First, the outer sleeve of the centralizer is placed on the bottom casing section that has been lowered into the well. Then, the electric telescopic rod is started, and its output end begins to extend downward, pushing the push plate below to move. The push plate squeezes the bottom force rod through the sliding wheel, forcing the shaft to rotate, thereby driving the lower extension rod to swing inward. Finally, it drives the lower clamping frame to firmly hold the lower casing. When the push plate moves down to contact the limit plate, the output end stops moving. At this time, the lower casing has been reliably fixed and is ready to be connected to the next casing. S2: Insert the top sleeve into the upper port of the centralizer's outer sleeve, so that the two sleeves are connected inside the outer sleeve. At this time, the body of the electric telescopic rod begins to slide upward under the push of the reverse force. When the body rises, the push plate fixed on its top rises synchronously and squeezes the top force rod. The same mechanical principle works again, and the upper extension rod and clamping frame swing inward, thereby locking the upper sleeve. At this point, the upper and lower clamping mechanisms connect the two sleeves and the centralizer into a whole. At the same time, the body rises and also drives the inner squeezing block to rise together, squeezing a trapezoidal frame with an inclined surface. The trapezoidal frame converts the vertical force it receives into a horizontal thrust, which is transmitted through the crossbeam, driving the inner fixed frame to contract inward and tightly clamp the connection of the two sleeves. S3: As the trapezoidal frame moves inward to complete the seal, it also drives the tie rod to move synchronously through the side plates on both sides. The tie rod slides in the groove of the crank, converting linear motion into rotational motion, thereby pushing the swing rod and its end support leg to swing outward around the pin shaft as the center, and finally being stably supported on the well wall. The synchronous deployment of all the support legs ensures that the entire casing string is stably positioned in the center of the wellbore, forming a uniform annular space.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention integrates the sleeve connection function with the centralizing support function. The adjustment structure not only controls the opening and closing of the support structure, but also actively connects the sleeve and the outer sleeve, solving the problem that the sleeve and the centralizer cannot be connected through the structure. This design prevents the risk of liquid leakage caused by poor connection.

[0017] 2. This invention, through the specific mechanical principle of the adjustment mechanism, utilizes the lever structure of the shaft and extension rod to amplify a small-angle swing into a large radial displacement of the clamping frame, achieving labor-saving and efficient clamping. At the same time, a spring plate is set to provide an elastic force for the clamping frame to automatically reset. When it is necessary to release the clamp or perform initial installation, the clamping frame can automatically open, which is convenient for operation and improves the reusability and ease of operation of the equipment.

[0018] 3. By setting rollers that contact the casing surface, the present invention can transform traditional sliding friction into rolling friction, which greatly reduces the frictional resistance between the casing and the centralizer during the lowering process, making the well operation smoother and preventing jamming. At the same time, the hollow opening reduces the overall weight of the clamping frame, meeting the design requirements for lightweight downhole tools.

[0019] 4. This invention simplifies the control logic by using a single electric telescopic rod as the power source. Only one electrical signal is needed to trigger a series of complex actions, achieving automated operation and reducing human intervention and operational difficulty. At the same time, through a sequential control mechanism, the output end of the electric telescopic rod first moves downward to complete the clamping of the lower sleeve. After touching the limit plate, the machine body then uses the reaction force to move upward to complete the clamping of the upper sleeve, ensuring that the upper and lower sleeves are locked sequentially and reliably. The action sequence is reliable and no additional sensors are required.

[0020] 5. The present invention provides a stable guide for the up and down sliding of the electric telescopic rod through the guide rod and support plate, preventing it from tilting and ensuring the accuracy and reliability of power transmission. The compression spring is compressed and stores energy when the machine body rises. When the work is completed and the outriggers and clamping frame need to be retracted, the output end of the electric telescopic rod retracts, and the compression spring releases energy to assist the machine body in quickly resetting, which improves the resetting efficiency and response speed of the entire system.

[0021] 6. This invention uses a fixed frame to directly act on the connection between the two sleeves, which is the most vulnerable part to leakage. By tightening this connection, the sealing effect is greatly enhanced, effectively preventing interlayer flow. This sealing action is linked with the adjustment structure, realizing multi-functional collaborative operation and further improving the overall reliability of the equipment.

[0022] 7. This invention converts the vertical movement of the electric telescopic rod body into the horizontal movement of the crossbeam by cooperating with the inclined surface of the extrusion block and the trapezoidal frame. The structure is compact and the force transmission efficiency is high. This inclined surface cooperation method has a self-locking effect, which helps to maintain the contracted state of the fixed frame to a certain extent and enhances the stability of the seal.

[0023] 8. The present invention uses outriggers as the final components that contact the well wall. Their design allows for a larger contact area, thereby providing more stable and reliable support, effectively preventing swaying and tilting, and ensuring precise centering of the casing.

[0024] 9. The present invention uses a crank-slider mechanism in which the tie rod slides in the crank groove to convert the linear motion of the trapezoidal frame into the rotational swing of the pendulum, thereby controlling the deployment of the outriggers. This mechanism ensures that the deployment of all outriggers is synchronized and driven by the same power source, ensuring that the casing is upright in the center of the wellbore, forming a uniform annular space, which lays the foundation for high-quality cementing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an enlarged schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the supporting structure of the present invention; Figure 4 This is a schematic diagram of the adjusting structure of the present invention; Figure 5 This is a schematic diagram of the structure of the clamping frame and rollers of the present invention; Figure 6 This is a schematic diagram of the linkage structure of the present invention; Figure 7 This is a schematic diagram of the structure of the swing arm and support leg of the present invention; Figure 8 This is a schematic diagram of the driving structure of the present invention.

[0026] In the diagram: 1. Outer sleeve; 2. Sleeve; 3. Support structure; 4. Adjustment structure; 5. Connecting plate; 6. Shaft; 7. Extension rod; 8. Clamping frame; 9. Spring plate; 10. Movable block; 11. Roller; 12. Vertical plate; 13. Electric telescopic rod; 14. Push plate; 15. Force-bearing rod; 16. Sliding wheel; 17. Limiting plate; 18. Support plate; 19. Connecting block; 20. Guide rod; 21. Compression spring; 22. Fixed frame; 23. Crossbeam; 24. Linkage structure; 25. Trapezoidal frame; 26. Extrusion block; 27. Bracket; 28. Swing rod; 29. ​​Support leg; 30. Drive structure; 31. Side plate; 32. Pull rod; 33. Crank. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 8 As shown, the present invention provides an embedded spiral ball sleeve centralizer and its usage method, including an outer sleeve 1; sleeves 2 are provided at the top and bottom of the outer sleeve 1, the end of the sleeve 2 near the outer sleeve 1 extends into the interior of the outer sleeve 1 and communicates with each other, a support structure 3 is provided on the outer surface of the outer sleeve 1, the side of the support structure 3 away from the outer sleeve 1 extends to the outside of the two sleeves 2 respectively and contacts the surface of the sleeves 2, and an adjustment structure 4 corresponding to the support structure 3 is provided on the outer surface of the outer sleeve 1, the adjustment structure 4 can control the opening and closing of the support structure 3 and connect the sleeves 2 to the outer sleeve 1.

[0029] refer to Figure 3 The support structure 3 includes a connecting plate 5 fixedly connected to the outer surface of the outer sleeve 1. There are several connecting plates 5 arranged evenly around the outer sleeve 1. A shaft 6 is inserted into both ends of the connecting plate 5. An extension rod 7 is fixedly connected to both sides of the surface of the shaft 6. A clamping frame 8 is fixedly connected to the side of the extension rod 7 away from the shaft 6. The clamping frame 8 is arranged around the outside of the sleeve 2 and contacts the surface of the sleeve 2. The adjustment structure 4 is located outside the connecting plate 5 and can control the extension rods 7 on both sides to swing and clamp the sleeve 2 in sequence. A spring plate 9 is fixedly connected to the inside of the extension rod 7. The side of the spring plate 9 away from the extension rod 7 contacts the surface of the connecting plate 5. The spring plate 9 is elastic and can push the extension rod 7 to swing outward and reset.

[0030] As a technical optimization of the present invention, by specifying the mechanical principle of the adjustment mechanism, the lever structure of the shaft 6 and the extension rod 7 is used to amplify a small angle swing into a large radial displacement of the clamping frame 8, thereby achieving labor-saving and efficient clamping. At the same time, the spring plate 9 is set to provide an elastic force for the clamping frame 8 to automatically reset. When it is necessary to release the clamp or perform initial installation, the clamping frame 8 can automatically open, which is convenient for operation and improves the reusability and ease of operation of the equipment.

[0031] refer to Figure 5 The surface of the clamping frame 8 is provided with a hollow opening. The inner side of the clamping frame 8 is fixedly connected to movable blocks 10 located on both sides of the hollow opening. The inner side of the movable blocks 10 is movably connected to rollers 11 through pins. The outer surface of the rollers 11 contacts the outer surface of the sleeve 2, and the rollers 11 are slidably connected to the sleeve 2.

[0032] As a technical optimization of the present invention, by setting roller 11 and having roller 11 in contact with the surface of casing 2, the traditional sliding friction can be changed into rolling friction, which greatly reduces the frictional resistance between casing 2 and centralizer during the lowering process, making the well operation smoother and preventing jamming. At the same time, the hollow opening reduces the overall weight of clamping frame 8, which meets the design requirements of lightweight downhole tools.

[0033] refer to Figure 4The adjusting structure 4 includes a vertical plate 12 fixedly connected to the outside of the connecting plate 5. An electric telescopic rod 13 is slidably connected inside the vertical plate 12. Push plates 14 are fixedly connected to the output end of the electric telescopic rod 13 and the top of the electric telescopic rod 13 body. Force-bearing rods 15 located outside the extension rod 7 are fixedly connected to both ends of the shaft 6. Push plates 14 are located outside the force-bearing rods 15. A sliding wheel 16, in contact with the force-bearing rod 15, is movably connected to the surface of the push plates 14 via a pin. A limit plate 17 is fixedly connected to the outside of the connecting plate 5. The side of the position plate 17 away from the connecting plate 5 is sleeved on the surface of the output end of the electric telescopic rod 13 and extends to the lower part of the bottom push plate 14. When the output end of the electric telescopic rod 13 extends downward, it can carry the bottom push plate 14 to move downward first. When the bottom push plate 14 pushes the bottom force rod 15 to swing and contact the limiting plate 17, the output end of the electric telescopic rod 13 can use the reverse support force to push the body to slide and rise inside the upright plate 12 until the push plate 14 on the surface of the electric telescopic rod 13 contacts the top force rod 15.

[0034] As a technical optimization of the present invention, by using a single electric telescopic rod 13 as the power source, the control logic is simplified. Only one electrical signal is needed to trigger a series of complex subsequent actions, realizing automated operation, reducing human intervention and operational difficulty. At the same time, through the sequential control mechanism, the output end of the electric telescopic rod 13 first moves downward to complete the clamping of the lower sleeve 2. After touching the limit plate 17, the machine body then uses the reaction force to move upward to complete the clamping of the upper sleeve 2, ensuring that the upper and lower sleeves 2 are locked sequentially and reliably. The action sequence is reliable and no additional sensors are required.

[0035] refer to Figure 4 and Figure 5 A support plate 18 is fixedly connected to the outer side of the connecting plate 5. Connecting blocks 19 are fixedly connected to both sides of the surface of the electric telescopic rod 13. A guide rod 20 is fixedly connected to the surface of the connecting block 19. The side of the guide rod 20 away from the connecting block 19 passes through the support plate 18 and is slidably connected to the support plate 18. A compression spring 21 is sleeved on the surface of the guide rod 20 between the connecting block 19 and the support plate 18. The compression spring 21 can store elastic force when the electric telescopic rod 13 body rises and release when the output end of the electric telescopic rod 13 retracts.

[0036] As a technical optimization of the present invention, the guide rod 20 and the support plate 18 provide a stable guide for the up and down sliding of the electric telescopic rod 13, preventing it from tilting and ensuring the accuracy and reliability of power transmission. The compression spring 21 is compressed and stores energy when the machine body rises. When the work is completed and the outrigger 29 and clamping frame 8 need to be retracted, the output end of the electric telescopic rod 13 retracts, and the compression spring 21 releases energy to assist the machine body in quickly resetting, thereby improving the resetting efficiency and response speed of the entire system.

[0037] refer to Figure 6The inner part of the outer sleeve 1 is provided with several fixed frames 22 corresponding to the connecting plate 5. The fixed frames 22 are wrapped around the connection between the two sleeves 2. A crossbeam 23 is fixedly connected to the outer side of the fixed frame 22. The side of the crossbeam 23 away from the fixed frame 22 passes through the outer sleeve 1 and the connecting plate 5 and extends to the outer side of the connecting plate 5. The surface of the electric telescopic rod 13 is provided with a linkage structure 24. The linkage structure 24 can control the crossbeam 23 to move inward when the electric telescopic rod 13 body rises.

[0038] As a technical optimization of the present invention, the fixing frame 22 is set to act directly on the connection between the two sleeves 2, which is the most critical part that is most prone to leakage. By tightening this part, the sealing effect is greatly enhanced and the interlayer flow is effectively prevented. This sealing action is linked with the adjustment structure 4 to realize multi-functional collaborative operation and further improve the overall reliability of the equipment.

[0039] refer to Figure 6 The linkage structure 24 includes a trapezoidal frame 25 fixedly connected to the outside of the crossbeam 23. The bottom of the trapezoidal frame 25 is set to be inclined. An extrusion block 26 is fixedly connected to the inside of the electric telescopic rod 13. The side of the extrusion block 26 away from the electric telescopic rod 13 contacts the inclined surface of the trapezoidal frame 25. When the body of the electric telescopic rod 13 rises, the extrusion block 26 can be used to extrude the trapezoidal frame 25 to make it carry the crossbeam 23 to move inward.

[0040] As a technical optimization of the present invention, the vertical movement of the electric telescopic rod 13 body is converted into the horizontal movement of the crossbeam 23 by the cooperation of the squeezing block 26 and the inclined surface of the trapezoidal frame 25. The structure is compact and the force transmission efficiency is high. This inclined surface cooperation method has a self-locking effect, which helps to maintain the contracted state of the fixed frame 22 to a certain extent and enhances the stability of the seal.

[0041] refer to Figure 7 The outer casing 1 is fixedly connected to the brackets 27 located on both sides of the connecting plate 5. The outer side of the brackets 27 is movably connected to the swing rod 28 via a pin. The side of the swing rod 28 away from the brackets 27 is equipped with a support leg 29, which can contact the well wall. The surface of the trapezoidal frame 25 is provided with a drive structure 30, which can control the swing rod 28 to swing and unfold when the trapezoidal frame 25 moves.

[0042] As a technical optimization of the present invention, the support leg 29 is used as the component that finally contacts the well wall. Its design can have a larger contact area, thereby providing more stable and reliable support, effectively preventing swaying and tilting, and ensuring the precise centering of the casing 2.

[0043] refer to Figure 8The drive structure 30 includes side plates 31 fixedly connected to both sides of the trapezoidal frame 25. A pull rod 32 is fixedly connected to the side of the side plate 31 away from the trapezoidal frame 25. A crank 33 is fixedly connected to the outer side of the swing rod 28. The pull rod 32 extends into the inside of the crank 33 and is slidably connected to the crank 33 on the side away from the side plate 31. During the process of the trapezoidal frame 25 moving into the outer sleeve 1, the pull rod 32 can be carried by the side plate 31 to slide synchronously. The pull rod 32 slides inside the crank 33 and the swing rod 28 is carried by the crank 33 to swing and unfold around the pin shaft.

[0044] As a technical optimization of the present invention, the linear motion of the trapezoidal frame 25 is converted into the rotational swing of the swing rod 28 by the crank 33 slider mechanism through the sliding of the tie rod 32 in the groove of the crank 33, thereby controlling the deployment of the outrigger 29. This mechanism ensures that the deployment of all outriggers 29 is synchronized and driven by the same power source, ensuring that the casing 2 is upright in the center of the wellbore, forming a uniform annular space, which lays the foundation for high-quality cementing.

[0045] An embedded spiral ball sleeve centralizer and its usage method include the following steps: S1: First, the outer sleeve 1 of the centralizer is placed on the bottom casing 2 section that has been lowered into the well. Then, the electric telescopic rod 13 is activated, and its output end begins to extend downward, pushing the push plate 14 below to move. The push plate 14 presses the bottom force rod 15 through the sliding wheel 16, forcing the shaft 6 to rotate, thereby driving the lower extension rod 7 to swing inward, and finally driving the lower clamping frame 8 to firmly hold the lower casing 2. When the push plate 14 moves down to contact the limiting plate 17, the output end stops moving. At this time, the lower casing 2 has been reliably fixed and is ready to be connected to the next casing 2. S2: Insert the top sleeve 2 into the upper port of the centralizer outer sleeve 1, so that the two sleeves 2 are connected inside the outer sleeve 1. At this time, the body of the electric telescopic rod 13 begins to slide upward under the push of the reverse force. When the body rises, the push plate 14 fixed on its top rises synchronously and squeezes the top force rod 15. The same mechanical principle is applied again, and the upper extension rod 7 and clamping frame 8 swing inward, thereby completing the locking of the upper sleeve 2. Thus, the upper and lower clamping mechanisms connect the two sleeves 2 with the centralizer into a whole. At the same time, the rise of the body also drives the inner squeezing block 26 to rise together, squeezing a trapezoidal frame 25 with an inclined surface. The trapezoidal frame 25 converts the vertical force it receives into a horizontal thrust, which is transmitted through the crossbeam 23, driving the inner fixed frame 22 to contract inward and tightly clamp the connection of the two sleeves 2. S3: As the trapezoidal frame 25 moves inward to complete the seal, it also drives the tie rod 32 to move synchronously through the side plates 31 on both sides. The tie rod 32 slides in the groove of the crank 33, converting linear motion into rotational motion, thereby pushing the swing rod 28 and its end support leg 29 to swing outward around the pin shaft, and finally stably support itself on the well wall. The synchronous deployment of all the support legs 29 ensures that the entire casing string is stably positioned in the center of the wellbore, forming a uniform annular space.

[0046] The working principle and usage process of this invention are as follows: First, the outer sleeve 1 is placed on the surface of the bottom sleeve 2. Then, the electric telescopic rod 13 is activated, and its output end extends downward. This action pushes the lower push plate 14, causing it to press against the bottom force-bearing rod 15. The force-bearing rod 15 drives the shaft 6 to rotate, forcing the connected lower extension rod 7 to swing inward, thereby driving the lower clamping frame 8 to firmly hold the lower sleeve 2. The roller 11 design on the inner side of the clamping frame 8 achieves both tight clamping and ensures low friction characteristics of the contact surface. When the push plate 14 moves downward... When the electric telescopic rod 13 reaches the limit position and contacts the limiting plate 17, the output end of the electric telescopic rod 13 stops moving. The user can insert the top sleeve 2 into the top of the outer sleeve 1, and the two sleeves 2 are connected to each other inside the outer sleeve 1. The continuously moving electric telescopic rod 13 body begins to slide upward under the push of the reaction force. When the body rises, the upper push plate 14 fixed on it rises synchronously and squeezes the top force rod 15. The same mechanical principle works again, and the upper extension rod 7 and the inner clamping frame 8 swing inward, finally completing the locking of the upper sleeve 2. At this point, the centralizer, through two sets of clamping mechanisms, achieves a dual guiding connection with the sleeve 2. The upward movement of the electric telescopic rod 13 simultaneously triggers two other key actions. First, the compression block 26 fixed inside rises, compressing a trapezoidal frame 25 with an inclined bottom surface. The trapezoidal frame 25 transmits horizontal thrust to the crossbeam 23, pushing the internal fixed frame 22 to contract centripetally, applying a third clamping force to the sleeve 2 coupling, greatly enhancing sealing reliability. Second, the inward movement of the trapezoidal frame 25, through the side plates 31 on both sides, drives the pull rod. 32 moves, and the pull rod 32 slides in the groove of the crank 33, converting linear motion into rotational motion, pushing the swing rod 28 and its end support leg 29 to extend outward until they make stable contact with the well wall. Finally, all the support legs 29 are synchronously and stably supported on the well wall, fixing the casing 2 in the center. The entire process is triggered by only one electrical signal, which automatically and continuously completes the three major functions of casing 2 locking, sealing enhancement and well wall support, forming a uniform annular space, creating ideal conditions for subsequent cement slurry injection, and significantly improving cementing quality and operation efficiency.

[0047] In summary, this embedded spiral ball sleeve centralizer integrates the connection function of the sleeve 2 with the centralizing support function. The adjustment structure 4 not only controls the opening and closing of the support structure 3, but also actively connects the sleeve 2 with the outer sleeve 1, solving the problem that the sleeve 2 and the centralizer cannot be connected through a structure. This design prevents the risk of liquid leakage caused by poor connection.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An embedded spiral ball sleeve centralizer, comprising an outer sleeve (1), characterized in that: The top and bottom of the outer jacket (1) are provided with sleeves (2). The end of the sleeve (2) near the outer jacket (1) extends into the interior of the outer jacket (1) and communicates with each other. The outer surface of the outer jacket (1) is provided with a support structure (3). The side of the support structure (3) away from the outer jacket (1) extends to the outside of the two sleeves (2) and contacts the surface of the sleeves (2). The outer surface of the outer jacket (1) is provided with an adjustment structure (4) corresponding to the support structure (3). The adjustment structure (4) can control the support structure (3) to open and close and connect the sleeve (2) to the outer jacket (1).

2. The embedded spiral ball sleeve centralizer according to claim 1, characterized in that: The support structure (3) includes a connecting plate (5) fixedly connected to the outer surface of the outer sleeve (1). The number of connecting plates (5) is several and they are evenly arranged around the outer sleeve. A shaft (6) is inserted into both ends of the connecting plate (5). An extension rod (7) is fixedly connected to both sides of the surface of the shaft (6). A clamping frame (8) is fixedly connected to the side of the extension rod (7) away from the shaft (6). The clamping frame (8) is arranged around the outside of the sleeve (2) and contacts the surface of the sleeve (2). The adjustment structure (4) is located outside the connecting plate (5) and can control the extension rods (7) on both sides to swing and clamp the fixed sleeve (2) in sequence. A spring plate (9) is fixedly connected to the inside of the extension rod (7). The side of the spring plate (9) away from the extension rod (7) contacts the surface of the connecting plate (5). The spring plate (9) is elastic and can push the extension rod (7) to swing outward and reset.

3. The embedded spiral ball sleeve centralizer according to claim 2, characterized in that: The surface of the clamping frame (8) is provided with a hollow opening. The inner side of the clamping frame (8) is fixedly connected to movable blocks (10) located on both sides of the hollow opening. The inner side of the movable block (10) is movably connected to a roller (11) through a pin. The outer surface of the roller (11) is in contact with the outer surface of the sleeve (2). The roller (11) is slidably connected to the sleeve (2).

4. The embedded spiral ball sleeve centralizer according to claim 3, characterized in that: The adjustment structure (4) includes a vertical plate (12) fixedly connected to the outside of the connecting plate (5). An electric telescopic rod (13) is slidably connected inside the vertical plate (12). A push plate (14) is fixedly connected to the output end of the electric telescopic rod (13) and the top of the electric telescopic rod (13). A force-bearing rod (15) located outside the extension rod (7) is fixedly connected to both ends of the shaft (6). The push plate (14) is located outside the force-bearing rod (15). A sliding wheel (16) in contact with the force-bearing rod (15) is movably connected to the surface of the push plate (14) via a pin. A fixed connection is made to the outside of the connecting plate (5). The limiting plate (17) is sleeved on the surface of the output end of the electric telescopic rod (13) and extends to the lower part of the bottom push plate (14) on the side away from the connecting plate (5). When the output end of the electric telescopic rod (13) extends downward, it can carry the bottom push plate (14) to move downward first. When the bottom push plate (14) pushes the bottom force rod (15) to swing and contact the limiting plate (17), the output end of the electric telescopic rod (13) can use the reverse support force to push the body to slide and rise inside the upright plate (12) until the push plate (14) on the surface of the electric telescopic rod (13) contacts the top force rod (15).

5. The embedded spiral ball sleeve centralizer according to claim 4, characterized in that: A support plate (18) is fixedly connected to the outer side of the connecting plate (5). Connecting blocks (19) are fixedly connected to both sides of the surface of the electric telescopic rod (13). A guide rod (20) is fixedly connected to the surface of the connecting block (19). The side of the guide rod (20) away from the connecting block (19) passes through the support plate (18) and is slidably connected to the support plate (18). A compression spring (21) is sleeved on the surface of the guide rod (20) between the connecting block (19) and the support plate (18). The compression spring (21) can store elastic force when the electric telescopic rod (13) body rises and release it when the output end of the electric telescopic rod (13) retracts.

6. The embedded spiral ball sleeve centralizer according to claim 5, characterized in that: The inner part of the outer sleeve (1) is provided with several fixed frames (22) corresponding to the connecting plate (5). The fixed frames (22) are wrapped around the connection between the two sleeves (2). A crossbeam (23) is fixedly connected to the outer side of the fixed frame (22). The side of the crossbeam (23) away from the fixed frame (22) passes through the outer sleeve (1) and the connecting plate (5) in sequence and extends to the outer side of the connecting plate (5). The surface of the electric telescopic rod (13) is provided with a linkage structure (24). The linkage structure (24) can control the crossbeam (23) to move inward when the body of the electric telescopic rod (13) rises.

7. The embedded spiral ball sleeve centralizer according to claim 6, characterized in that: The linkage structure (24) includes a trapezoidal frame (25) fixedly connected to the outside of the crossbeam (23). The bottom of the trapezoidal frame (25) is set to be inclined. An extrusion block (26) is fixedly connected to the inside of the electric telescopic rod (13). The side of the extrusion block (26) away from the electric telescopic rod (13) contacts the inclined surface of the trapezoidal frame (25). When the body of the electric telescopic rod (13) rises, the extrusion block (26) can extrude the trapezoidal frame (25) to make it carry the crossbeam (23) to move inward.

8. The embedded spiral ball sleeve centralizer according to claim 7, characterized in that: The outer casing (1) is fixedly connected to brackets (27) located on both sides of the connecting plate (5). The outer side of the brackets (27) is movably connected to a swing rod (28) via a pin. A support leg (29) is installed on the side of the swing rod (28) away from the bracket (27). The support leg (29) can contact the well wall. The surface of the trapezoidal frame (25) is provided with a driving structure (30). The driving structure (30) can control the swing rod (28) to swing and unfold when the trapezoidal frame (25) moves.

9. The embedded spiral ball sleeve centralizer according to claim 8, characterized in that: The drive structure (30) includes side plates (31) fixedly connected to both sides of the trapezoidal frame (25). A pull rod (32) is fixedly connected to the side of the side plate (31) away from the trapezoidal frame (25). A crank (33) is fixedly connected to the outer side of the swing rod (28). The pull rod (32) extends into the inside of the crank (33) and slides with the crank (33) on the side away from the side plate (31). During the process of the trapezoidal frame (25) moving into the outer sleeve (1), the pull rod (32) can be carried by the side plate (31) to slide synchronously. The pull rod (32) slides inside the crank (33) and uses the crank (33) to carry the swing rod (28) to swing and unfold around the pin shaft.

10. A method of using an embedded spiral ball sleeve centralizer as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: First, put the outer sleeve (1) of the centralizer onto the bottom casing (2) section that has been lowered into the well. Then, start the electric telescopic rod (13), and its output end begins to extend downward, pushing the push plate (14) below to move. The push plate (14) squeezes the bottom force rod (15) through the sliding wheel (16), forcing the shaft (6) to rotate, thereby driving the lower extension rod (7) to swing inward, and finally driving the lower clamping frame (8) to firmly hold the lower casing (2). When the push plate (14) moves down to contact the limiting plate (17), the output end stops moving. At this time, the lower casing (2) has been reliably fixed, and is ready to connect to the next casing (2). S2: Insert the top sleeve (2) into the upper port of the outer sleeve (1) of the stabilizer, so that the two sleeves (2) are connected inside the outer sleeve (1). At this time, the body of the electric telescopic rod (13) begins to slide upward under the push of the reverse force. When the body rises, the push plate (14) fixed on its top rises synchronously and squeezes the top force rod (15). The same mechanical principle is applied again, and the upper extension rod (7) and clamping frame (8) swing inward, thereby completing the locking of the upper sleeve (2). At this point, the upper and lower clamping mechanisms connect the two sleeves (2) with the stabilizer into a whole. At the same time, the body rises and also drives the inner squeezing block (26) to rise together, squeezing a trapezoidal frame (25) with an inclined surface. The trapezoidal frame (25) converts the vertical force it receives into a horizontal thrust, which is transmitted through the crossbeam (23) and drives the inner fixed frame (22) to shrink inward and tightly clamp the connection of the two sleeves (2). S3: While the trapezoidal frame (25) moves inward to complete the sealing, it also drives the tie rod (32) to move synchronously through the side plates (31) on both sides. The tie rod (32) slides in the groove of the crank (33), converting the linear motion into a rotational motion, thereby pushing the swing rod (28) and its end support leg (29) to swing outward with the pin as the center, and finally support it stably on the well wall. The synchronous deployment of all the support legs (29) ensures that the entire casing string is stably positioned in the center of the wellbore, forming a uniform annular space.

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