Split centralizer for well cementation

Abstract

The utility model relates to a split centralizer for well cementation, which relates to the technical field of well cementation and is used for solving the problem of poor rotational flow effect of a rigid rotational flow centralizer. The inner sleeve is fixed on the outer peripheral wall of the casing pipe; the body is arranged on the peripheral wall of the inner sleeve in a sleeving manner; the supporting assembly is arranged between the inner sleeve and the body and used for supporting the body; wherein a radial gap is formed between the inner sleeve and the body, the body is rotationally connected with the inner sleeve through the supporting assembly, and the split type centralizer for well cementation is constructed in the mode that when fluid flows through the body, the fluid can drive the body to rotate. According to the split type centralizer for well cementation, the split type centralizer for well cementation is arranged to be of a split type structure, the body is driven to rotate through fluid water conservancy, in this way, the speed of fluid flowing out of the split type centralizer for well cementation to form turbulent flow can be increased, and the rotational flow effect is enhanced. In this way, the cement paste in the annulus displaces the drilling fluid in a turbulent flow mode, and therefore the well cementation displacement efficiency and the well cementation quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of well cementing, in particular to a split type centralizer for well cementing. Background Art

[0002] At present, in the cementing operations of oil and gas wells such as oil and gas, field construction experience shows that during the cementing process, ensuring that the casing is centered and that the cement slurry in the annulus replaces the drilling fluid in a turbulent manner is one of the effective ways to improve the cementing displacement efficiency and cementing quality.

[0003] Existing elastic flow guide centralizers often utilize multiple elastic straightening bars welded between two end tubes or braided together with a hoop. These bars have low overall strength and poor straightening performance in well sections with high well deviations. Therefore, rigid cyclone centralizers are often used instead. While these existing rigid cyclone centralizers offer superior strength, they suffer from poor cyclone performance in well sections with high deviations. This can lead to a mixture of cement slurry and drilling fluid, creating a "dead mud" zone. This results in low cementing displacement efficiency, thus impacting cementing quality.

[0004] In other words, the rigid swirl centralizer in the prior art has the problem of poor swirl effect. Utility Model Content

[0005] The utility model provides a split type centralizer for cementing, which is used to solve the problem of poor swirl effect existing in a rigid swirl centralizer.

[0006] The utility model provides a split type centralizer for cementing, comprising:

[0007] an inner sleeve fixed to the outer peripheral wall of the sleeve; and

[0008] a main body, which is sleeved on the outer peripheral wall of the inner sleeve; and

[0009] A support assembly is provided between the inner sleeve and the body, and is used to support the body;

[0010] There is a radial gap between the inner sleeve and the body, and the body is rotatably connected to the inner sleeve through a support assembly. The split-type centralizer for cementing is constructed so that when fluid flows through the body, the fluid can drive the body to rotate.

[0011] In one embodiment, a plurality of flow grooves are provided on the outer peripheral wall of the body, and the plurality of flow grooves are arranged at intervals along the circumference of the body. The split type centralizer for cementing is constructed so that when the fluid flows through the plurality of flow grooves, the fluid can drive the body to rotate.

[0012] In one embodiment, the flow grooves are opened on the outer peripheral wall of the body around the central axis of the body, and the flow grooves are distributed in a spiral shape.

[0013] In one embodiment, the body is configured such that the width of the flow groove thereof gradually decreases along the flow direction of the fluid.

[0014] In one embodiment, a first arcuate groove is provided on the outer circumferential wall of the inner sleeve, and a second arcuate groove corresponding to the first arcuate groove is provided on the inner circumferential wall of the main body. The support assembly includes a plurality of rolling bodies, and the plurality of rolling bodies are arranged in an annular space enclosed by the first arcuate groove and the second arcuate groove so as to roll along the circumference of the inner sleeve.

[0015] In one embodiment, the rolling elements are balls or cylindrical rollers.

[0016] In one embodiment, a plurality of first arcuate grooves spaced apart along a first direction are provided on the outer circumferential wall of the inner sleeve, and a plurality of second arcuate grooves spaced apart along the first direction are provided on the inner circumferential wall of the main body, and the plurality of first arcuate grooves and the plurality of second arcuate grooves are arranged in one-to-one correspondence.

[0017] In one embodiment, a first arcuate groove is provided on the outer peripheral wall of the inner sleeve, and a second arcuate groove corresponding to the first arcuate groove is provided on the inner peripheral wall of the body, and the support assembly includes:

[0018] a first wear-resistant ring disposed in the first arc-shaped groove; and

[0019] a second wear-resistant ring disposed in the second arc-shaped groove; and

[0020] A plurality of rolling bodies are arranged in an annular space enclosed by the first wear-resistant ring and the second wear-resistant ring so as to roll along the circumference of the inner sleeve.

[0021] In one embodiment, the split type centralizer for cementing further comprises a scraper fixed on the outer peripheral wall of the body. The scraper can be rotated to scrape and clean the well wall, wherein a flow channel is formed between the scraper and the flow groove, and the fluid flows through the flow channel.

[0022] In one embodiment, the inner sleeve comprises:

[0023] A cylindrical body is sleeved on the outer peripheral wall of the sleeve, and a limiting shoulder is provided at one end of the cylindrical body; and

[0024] A compression ring is sleeved on the other end of the cylinder;

[0025] The clamping ring can press and fix the body on the limiting shoulder. The limiting shoulder and / or the other end of the cylinder are provided with a threaded through hole, which is used to fix the inner sleeve on the outer peripheral wall of the inner sleeve.

[0026] Compared with existing technologies, the advantages of this utility model lie in the split-type cementing centralizer, which is designed as a split structure and utilizes hydraulic fluid to drive the main body to rotate. This accelerates the rate at which the fluid flowing out of the split-type cementing centralizer forms turbulent flow, thereby improving the fluid's ability to generate turbulent flow (enhancing the swirl effect). This allows cement slurry in the annulus to displace drilling fluid in a turbulent manner, thereby improving cementing displacement efficiency and quality. Furthermore, the main body can simultaneously straighten the casing, thus fulfilling the straightening function of the split-type cementing centralizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the structure of a split type centralizer for cementing in the first embodiment of the present utility model;

[0029] Figure 2 yes Figure 1 Main cross-sectional view of a split centralizer for cementing (without showing the clamping ring);

[0030] Figure 3 This is a schematic diagram of the structure of a split-type centralizer for cementing in the second embodiment of the present invention (the wall scraper is not shown);

[0031] Figure 4 yes Figure 3 Main cross-sectional view of a split centralizer for cementing (without showing the clamping ring);

[0032] Figure 5 yes Figure 4 Schematic diagram of the support assembly.

[0033] Reference numerals:

[0034] 10. Inner sleeve; 11. Cylinder; 111. Limiting shoulder; 12. Clamping ring; 20. Main body; 21. Flow groove; 30. Support assembly; 31. Rolling element; 32. First wear-resistant ring; 33. Second wear-resistant ring; 40. Scraper; 41. Protrusion. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] Example 1

[0037] like Figure 1 and Figure 2As shown, the present invention provides a split-type centralizer for cementing, comprising an inner sleeve 10, a body 20, and a support assembly 30. The inner sleeve 10 is fixed to the outer circumferential wall of the casing; the body 20 is sleeved on the outer circumferential wall of the inner sleeve 10; and the support assembly 30 is disposed between the inner sleeve 10 and the body 20 to support the body 20. A radial gap is defined between the inner sleeve 10 and the body 20, and the body 20 is rotatably connected to the inner sleeve 10 via the support assembly 30. The split-type centralizer for cementing is configured such that when fluid flows through the body 20, the fluid drives the body 20 to rotate.

[0038] In the above configuration, the split-type cementing centralizer is configured as a split structure, and the main body 20 is hydraulically driven to rotate. This accelerates the rate at which the fluid flowing out of the split-type cementing centralizer forms turbulent flow, thereby improving the fluid's ability to generate turbulent flow (i.e., enhancing the swirl effect). This allows cement slurry in the annulus to displace drilling fluid in a turbulent manner, thereby improving cementing displacement efficiency and quality. Furthermore, the main body 20 can simultaneously straighten the casing as it rotates, thus fulfilling the straightening function of the split-type cementing centralizer.

[0039] It should be noted that if the split-type centralizer for cementing is placed 1-2 m below the target layer, the main body 20 can be rotated rapidly when the cement slurry passes through, providing a part of the lateral force to the fluid, thereby further improving the scouring of the well wall of the target layer and improving the cementing quality of the target layer.

[0040] Specifically, if Figure 1 and Figure 2 As shown, in one embodiment, a plurality of flow grooves 21 are provided on the outer peripheral wall of the main body 20, and the plurality of flow grooves 21 are arranged at intervals along the circumference of the main body 20. The split-type centralizer for cementing is constructed so that when the fluid flows through the plurality of flow grooves 21, the fluid can drive the main body 20 to rotate.

[0041] In the above arrangement, fluid flowing through the flow slot 21 generates a lateral force. Consequently, when fluid flows through multiple flow slots 21, multiple lateral forces are generated. Since the directions of these multiple lateral forces are consistent, a combined force is generated to propel the main body 20. This achieves the function of hydraulically driving the main body 20 to rotate, thereby ensuring that the fluid flowing out of the split-type centralizer for cementing is accelerated to form turbulent flow.

[0042] Specifically, if Figure 1 and Figure 2As shown, in one embodiment, six flow grooves 21 are provided on the outer circumferential wall of the main body 20, spaced apart along the circumference of the main body 20. As fluid flows through the six flow grooves 21, six lateral forces are generated. Since the six lateral forces are directed in the same direction, a combined force is generated to propel the main body 20. This achieves the function of hydraulically driving the rotation of the main body 20, thereby ensuring that the fluid flowing out of the split-type centralizer for cementing is accelerated to form turbulent flow.

[0043] It should be noted that the number of flow slots 21 can be adjusted according to actual conditions and can be set to three, five, or other numbers. For example, if the body 20 needs to rotate faster, seven or more flow slots 21 can be provided. Of course, the number of flow slots 21 is also limited by the body diameter, and it is impossible to provide an infinite number of flow slots 21.

[0044] Specifically, if Figure 1 As shown, in one embodiment, the flow grooves 21 are opened on the outer peripheral wall of the body 20 around the central axis of the body 20, and the flow grooves 21 are distributed in a spiral shape.

[0045] In the above arrangement, the flow grooves 21 are arranged in a spiral pattern. This allows for better utilization of the fluid's flow force, i.e., a higher conversion rate of the fluid's flow force into thrust. This improves the rotational efficiency of the body 20 and, in turn, increases the efficiency of the fluid in generating turbulent flow.

[0046] Specifically, if Figure 1 As shown, in one embodiment, a first arcuate groove is provided on the outer circumferential wall of the inner sleeve 10, and a second arcuate groove corresponding to the first arcuate groove is provided on the inner circumferential wall of the main body 20. The support assembly 30 includes a plurality of rolling bodies 31, and the plurality of rolling bodies 31 are arranged to roll along the circumference of the inner sleeve 10 in an annular space enclosed by the first arcuate groove and the second arcuate groove.

[0047] In the above arrangement, the rolling element 31 has two functions: first, it supports the main body 20, ensuring a gap between the main body 20 and the inner sleeve 10 without contact. Second, it prevents friction between the main body 20 and the inner sleeve 10, thereby improving the rotation efficiency of the main body 20 and thus improving the efficiency of the fluid in forming turbulent flow.

[0048] It should be noted that as the main body 20 rotates, the multiple rolling elements 31 roll along the circumference of the inner sleeve 10 within the annular space enclosed by the first and second arcuate grooves. This reduces friction between the rolling elements 31 and the main body 20 and inner sleeve 10, thereby improving the rotational efficiency of the main body 20 and, in turn, the efficiency of fluid turbulence.

[0049] Specifically, if Figure 2 As shown, in one embodiment, the rolling element 31 is a steel ball.

[0050] Of course, in an alternative embodiment not shown in the drawings of this application, the rolling body 31 may also be a cylindrical roller.

[0051] Specifically, if Figure 1 As shown, in one embodiment, a plurality of first arcuate grooves spaced apart along a first direction (the direction of the central axis of the inner sleeve 10) are provided on the outer peripheral wall of the inner sleeve 10, and a plurality of second arcuate grooves spaced apart along the first direction are provided on the inner peripheral wall of the main body 20, and the plurality of first arcuate grooves and the plurality of second arcuate grooves are provided in a one-to-one correspondence.

[0052] Specifically, if Figure 1 As shown, in one embodiment, two first arcuate grooves spaced apart along a first direction are provided on the outer circumferential wall of the inner sleeve 10, and two second arcuate grooves spaced apart along the first direction are provided on the inner circumferential wall of the main body 20, and the two first arcuate grooves and the two second arcuate grooves are provided in a one-to-one correspondence.

[0053] Specifically, if Figure 2 As shown, in one embodiment, two rolling elements 31 roll along the circumference of the inner sleeve 10 within the annular space enclosed by the first and second arcuate grooves. This reduces friction between the rolling elements 31 and the body 20 and inner sleeve 10, thereby improving the rotational efficiency of the body 20 and, in turn, the efficiency of fluid turbulence.

[0054] It should be noted that, in order to further improve the efficiency of the fluid in forming turbulent flow, the number of the first and second arc-shaped grooves, as well as the number of rolling elements 31 may be increased.

[0055] Specifically, if Figure 1 and Figure 2 As shown, in one embodiment, the inner sleeve 10 includes a cylindrical body 11 and a clamping ring 12. The cylindrical body 11 is sleeved on the outer circumferential wall of the sleeve, and a limiting shoulder 111 is provided at one end of the cylindrical body 11; the clamping ring 12 is sleeved on the other end of the cylindrical body 11; the clamping ring 12 can press and fix the body 20 on the limiting shoulder 111. The limiting shoulder 111 and the other end of the cylindrical body 11 are both provided with threaded through holes, which are used to fix the inner sleeve 10 to the outer circumferential wall of the inner sleeve 10.

[0056] It should be noted that a locking screw is provided in the threaded through hole, and the cylindrical body 11 can be fixed to the outer peripheral wall of the sleeve by rotating the locking screw.

[0057] Specifically, in one embodiment, an external thread is provided on the other end of the cylindrical body 11, and an internal thread is provided in the clamping ring 12, and the external thread and the internal thread cooperate with each other. In this way, the clamping ring 12 can be screwed to tighten and fix the body 20 on the limiting shoulder 111.

[0058] Specifically, if Figure 1 and Figure 2 As shown, in one embodiment, the flow groove 21 is a trapezoidal open groove.

[0059] Of course, the flow slot 21 can be set as a rectangular opening slot, an arc opening slot, or a semicircular opening slot according to actual conditions.

[0060] Example 2

[0061] like Figure 3 and Figure 4 As shown, the present invention provides a split-type centralizer for cementing, comprising an inner sleeve 10, a body 20, and a support assembly 30. The inner sleeve 10 is fixed to the outer circumferential wall of the casing; the body 20 is sleeved on the outer circumferential wall of the inner sleeve 10; and the support assembly 30 is disposed between the inner sleeve 10 and the body 20 to support the body 20. A radial gap is defined between the inner sleeve 10 and the body 20, and the body 20 is rotatably connected to the inner sleeve 10 via the support assembly 30. The split-type centralizer for cementing is configured such that when fluid flows through the body 20, the fluid drives the body 20 to rotate.

[0062] In the above configuration, the split-type cementing centralizer is configured as a split structure, and the main body 20 is hydraulically driven to rotate. This accelerates the rate at which the fluid flowing out of the split-type cementing centralizer forms turbulent flow, thereby improving the fluid's ability to generate turbulent flow. This allows cement slurry in the annulus to displace drilling fluid in a turbulent manner, thereby improving cementing displacement efficiency and quality. Furthermore, the main body 20 can simultaneously straighten the casing as it rotates, thus fulfilling the centralizing function of the split-type cementing centralizer.

[0063] It should be noted that if the split-type centralizer for cementing is placed 1-2 m below the target layer, the main body 20 can be rotated rapidly when the cement slurry passes through, providing a part of the lateral force to the fluid, thereby further improving the scouring of the well wall of the target layer and improving the cementing quality of the target layer.

[0064] Specifically, if Figure 3 and Figure 4 As shown, in one embodiment, a plurality of flow grooves 21 are provided on the outer peripheral wall of the main body 20, and the plurality of flow grooves 21 are arranged at intervals along the circumference of the main body 20. The split-type centralizer for cementing is constructed so that when the fluid flows through the plurality of flow grooves 21, the fluid can drive the main body 20 to rotate.

[0065] In the above arrangement, fluid flowing through the flow slot 21 generates a lateral force. Consequently, when fluid flows through multiple flow slots 21, multiple lateral forces are generated. Since the directions of these multiple lateral forces are consistent, a combined force is generated to propel the main body 20. This achieves the function of hydraulically driving the main body 20 to rotate, thereby ensuring that the fluid flowing out of the split-type centralizer for cementing is accelerated to form turbulent flow.

[0066] Specifically, if Figure 3 and Figure 4 As shown, in one embodiment, six flow grooves 21 are provided on the outer circumferential wall of the main body 20, spaced apart along the circumference of the main body 20. As fluid flows through the six flow grooves 21, six lateral forces are generated. Since the six lateral forces are directed in the same direction, a combined force is generated to propel the main body 20. This achieves the function of hydraulically driving the rotation of the main body 20, thereby ensuring that the fluid flowing out of the split-type centralizer for cementing is accelerated to form turbulent flow.

[0067] It should be noted that the number of flow slots 21 can be adjusted according to actual conditions and can be set to three, five, or other numbers. For example, if the body 20 needs to rotate faster, seven or more flow slots 21 can be provided. Of course, the number of flow slots 21 is also limited by the body diameter, and it is impossible to provide an infinite number of flow slots 21.

[0068] Specifically, if Figure 3 and Figure 4 As shown, in one embodiment, the flow grooves 21 are opened on the outer peripheral wall of the body 20 around the central axis of the body 20, and the flow grooves 21 are distributed in a spiral shape.

[0069] In the above arrangement, the flow grooves 21 are arranged in a spiral pattern. This allows for better utilization of the fluid's flow force, i.e., a higher conversion rate of the fluid's flow force into thrust. This improves the rotational efficiency of the body 20 and, in turn, increases the efficiency of the fluid in generating turbulent flow.

[0070] Specifically, if Figure 3 and Figure 4 As shown, in one embodiment, the body 20 is constructed such that the width of its flow groove 21 gradually decreases along the flow direction of the fluid. This allows the pressure exerted by the fluid on the sidewalls of the flow groove 21 to gradually increase. In other words, the thrust gradually increases. This improves the rotational efficiency of the body 20 and, in turn, the efficiency of generating turbulent flow.

[0071] Specifically, if Figure 5As shown, in one embodiment, a first arcuate groove is provided on the outer circumferential wall of the inner sleeve 10, a second arcuate groove corresponding to the first arcuate groove is provided on the inner circumferential wall of the body 20, and the support assembly 30 includes a first wear-resistant ring 32, a second wear-resistant ring 33, and a plurality of rolling elements 31. The first wear-resistant ring 32 is disposed in the first arcuate groove; the second wear-resistant ring 33 is disposed in the second arcuate groove; and the plurality of rolling elements 31 are disposed in the annular space enclosed by the first wear-resistant ring 32 and the second wear-resistant ring 33 so as to roll along the circumference of the inner sleeve 10.

[0072] In the above arrangement, the rolling element 31 has two functions: first, it supports the main body 20, ensuring a gap between the main body 20 and the inner sleeve 10 without contact. Second, it prevents friction between the main body 20 and the inner sleeve 10, thereby improving the rotational efficiency of the main body 20 and thereby enhancing the efficiency of fluid turbulence. Furthermore, the first and second wear-resistant rings provide wear resistance, preventing direct contact between the rolling element 31 and the inner sleeve 10 and main body 20 during rolling, thus protecting these two components from wear and tear, thereby extending the service life of the split cementing centralizer.

[0073] It should be noted that as the main body 20 rotates, the multiple rolling elements 31 roll within the annular space along the circumference of the inner sleeve 10. This reduces friction between the rolling elements 31 and the main body 20 and inner sleeve 10, thereby improving the rotational efficiency of the main body 20 and, in turn, the efficiency of fluid turbulence.

[0074] Specifically, if Figure 4 As shown, in one embodiment, the rolling elements 31 are cylindrical rollers.

[0075] Of course, in an alternative embodiment not shown in the drawings of this application, the rolling body 31 may also be a steel ball.

[0076] Specifically, if Figure 4 As shown, in one embodiment, two first arcuate grooves spaced apart along a first direction (the direction of the central axis of the inner sleeve 10) are provided on the outer peripheral wall of the inner sleeve 10, and two second arcuate grooves spaced apart along the first direction are provided on the inner peripheral wall of the main body 20, and the two first arcuate grooves and the two second arcuate grooves are provided in a one-to-one correspondence.

[0077] Specifically, if Figure 4 As shown, in one embodiment, two rolling elements 31 roll along the circumference of the inner sleeve 10 within the annular space enclosed by the first and second arcuate grooves. This reduces friction between the rolling elements 31 and the body 20 and inner sleeve 10, thereby improving the rotational efficiency of the body 20 and, in turn, the efficiency of fluid turbulence.

[0078] It should be noted that, in order to further improve the efficiency of the fluid in forming turbulent flow, the number of the first and second arc-shaped grooves, as well as the number of rolling elements 31 may be increased.

[0079] Specifically, if Figure 3 and Figure 4 As shown, in one embodiment, the inner sleeve 10 includes a cylindrical body 11 and a clamping ring 12. The cylindrical body 11 is sleeved on the outer circumferential wall of the sleeve, and a limiting shoulder 111 is provided at one end of the cylindrical body 11; the clamping ring 12 is sleeved on the other end of the cylindrical body 11; the clamping ring 12 can press and fix the body 20 on the limiting shoulder 111. The limiting shoulder 111 and the other end of the cylindrical body 11 are both provided with threaded through holes, which are used to fix the inner sleeve 10 to the outer circumferential wall of the inner sleeve 10.

[0080] It should be noted that a locking screw is provided in the threaded through hole, and the cylindrical body 11 can be fixed to the outer peripheral wall of the sleeve by rotating the locking screw.

[0081] Specifically, in one embodiment, an external thread is provided on the other end of the cylindrical body 11, and an internal thread is provided in the clamping ring 12, and the external thread and the internal thread cooperate with each other. In this way, the clamping ring 12 can be screwed to tighten and fix the body 20 on the limiting shoulder 111.

[0082] Specifically, if Figure 3 and Figure 4 As shown, in one embodiment, the flow groove 21 is a trapezoidal open groove.

[0083] Of course, the flow slot 21 can be set as a rectangular opening slot, an arc opening slot, or a semicircular opening slot according to actual conditions.

[0084] Specifically, if Figure 4 As shown, in one embodiment, the split-type centralizer for cementing further includes a wall scraper 40, which is fixed on the outer peripheral wall of the main body 20. The wall scraper 40 can be rotated to scrape and clean the well wall, wherein a flow channel is formed between the wall scraper 40 and the flow groove 21, and the fluid flows through the flow channel.

[0085] It should be noted that the wall scraper 40 can rotate to scrape the well wall, which can improve the flushing ability of the split-type centralizer for cementing on the well wall.

[0086] Specifically, if Figure 4 As shown, in one embodiment, the scraper 40 is a cylindrical structure, which is sleeved on the outer peripheral wall of the body 20. A plurality of protrusions 41 are provided on the outer side wall of the scraper 40, which can enhance the scraping effect of the scraper 40.

[0087] Of course, in an alternative embodiment not shown in the drawings of the present application, the wall scraper is a spiral sheet, which is covered at the opening of the flow channel 21, and a plurality of protrusions are provided on the outer side of the spiral sheet.

[0088] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A split type centralizer for cementing, characterized in that: include: an inner sleeve fixed to the outer peripheral wall of the sleeve; as well as A main body, which is sleeved on the outer peripheral wall of the inner sleeve; as well as a support assembly, disposed between the inner sleeve and the body, the support assembly being used to support the body; There is a radial gap between the inner sleeve and the body, the body is rotatably connected to the inner sleeve through the support assembly, and the split-type centralizer for cementing is constructed so that when fluid flows through the body, the fluid can drive the body to rotate.

2. The split type centralizer for cementing according to claim 1, characterized in that: A plurality of flow grooves are provided on the outer peripheral wall of the body, and the plurality of flow grooves are arranged at intervals along the circumference of the body. The split-type centralizer for cementing is constructed so that when the fluid flows through the plurality of flow grooves, the fluid can drive the body to rotate.

3. The split type centralizer for cementing according to claim 2, characterized in that: The flow grooves are opened on the outer peripheral wall of the body around the central axis of the body, and the flow grooves are distributed in a spiral shape.

4. The split type centralizer for cementing according to claim 3, characterized in that: The body is constructed such that the width of the flow groove thereof gradually decreases along the flow direction of the fluid.

5. The split type centralizer for cementing according to claim 1, characterized in that: A first arcuate groove is provided on the outer peripheral wall of the inner sleeve, and a second arcuate groove corresponding to the first arcuate groove is provided on the inner peripheral wall of the main body. The support assembly includes a plurality of rolling bodies, and the plurality of rolling bodies are arranged in an annular space enclosed by the first arcuate groove and the second arcuate groove so as to roll along the circumference of the inner sleeve.

6. The split type centralizer for cementing according to claim 5, characterized in that: The rolling element is a ball or a cylindrical roller.

7. The split type centralizer for cementing according to claim 5, characterized in that: The outer peripheral wall of the inner sleeve is provided with a plurality of first arcuate grooves spaced apart along the first direction, and the inner peripheral wall of the body is provided with a plurality of second arcuate grooves spaced apart along the first direction, and the plurality of first arcuate grooves and the plurality of second arcuate grooves are arranged in a one-to-one correspondence.

8. The split type centralizer for cementing according to claim 1, characterized in that: The outer peripheral wall of the inner sleeve is provided with a first arcuate groove, the inner peripheral wall of the body is provided with a second arcuate groove corresponding to the first arcuate groove, and the support assembly includes: a first wear-resistant ring, which is disposed in the first arc-shaped groove; and a second wear-resistant ring disposed in the second arc-shaped groove; and A plurality of rolling bodies are arranged in an annular space enclosed by the first wear-resistant ring and the second wear-resistant ring so as to roll along the circumference of the inner sleeve.

9. The split type centralizer for cementing according to claim 2, characterized in that: The split-type centralizer for cementing also includes a scraper, which is fixed on the outer peripheral wall of the body. The scraper can be rotated to scrape and clean the well wall, wherein a flow channel is formed between the scraper and the flow groove, and the fluid flows through the flow channel.

10. The split type centralizer for cementing according to any one of claims 1 to 9, characterized in that: The inner sleeve comprises: a cylindrical body, which is sleeved on the outer peripheral wall of the sleeve, and one end of the cylindrical body is provided with a limiting shoulder; and a compression ring, which is sleeved on the other end of the cylindrical body; The clamping ring can press and fix the body on the limiting shoulder, and a threaded through hole is provided on the limiting shoulder and / or the other end of the cylindrical body, and the threaded through hole is used to fix the inner sleeve on the outer peripheral wall of the inner sleeve.

Images