Splicing type casing pipe elastic centralizer

Abstract

The utility model relates to the technical field of polymer processing and forming, and provides a splicing type casing elastic centralizer which comprises two lantern rings, two row type arch centralizing pieces, a splicing type elastic centralizer body, two casing bodies and four casing couplings. The two sleeve rings are used for fixing the two row type arch centralizing pieces together to form a complete centralizer, the four sleeve couplings are used for connecting the two sleeve bodies, and the inner diameters of the four sleeve couplings are larger than the outer diameters of the sleeve bodies. Through the structure of the lantern ring, the row type arched centralizing sheets and the casing coupling, the spliced elastic centralizer body is convenient for workers to assemble, time and labor are saved, meanwhile, super glue bonding and injection molding manufacturing are adopted, stress concentration and a heat affected zone which are possibly generated in the welding process are avoided, and the risk of material damage and cracks is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer processing and molding, in particular to a spliced casing elastic centralizer. Background Technique

[0002] In the process of geological exploration, cementing is an important link in the work of off-layer grouting. After the drilling is completed, a casing is lowered into the well, and cement needs to be injected into the annular space between the casing and the formation to seal the loose formation, ensure the normal operation of the drill string, and meet the requirements of geological exploration operations. At the same time, once the casing sealing is unqualified, the cementing quality is directly related to the working conditions of the drill string. Therefore, ensuring and improving the cementing quality is a key link in the process of drilling and completion. The centralizer is to improve the concentricity when different casings are butted, make the annular space around the casing uniform, the upward speed of the cement slurry is symmetrical around, improve the cementing displacement efficiency, ensure the cementing quality, and at the same time, using the centralizer when lowering the casing can also reduce the sticking of the casing during the process of lowering the casing string.

[0003] At present, there are more and more types of casing centralizers. Among them, the elastic centralizer is easy to be lowered into complex or small wellbores due to its deformable characteristics, relatively simple in processing and manufacturing, and has good centralizing effect under sufficient supporting force. However, the existing elastic centralizers are mostly formed by stamping metal parts, and the materials used are high-strength spring steel. It is formed by bending a steel plate into a cylinder and welding it, or dividing the steel plate into a collar and multiple centralizing pieces and welding them together. However, in this way, there must be structural defects, and there must be stress concentration areas or stress weak areas on the welds. The centralizer cannot produce large deformations, otherwise the welds are prone to rupture and cause failure.

[0004] Therefore, a centralizer with good toughness, simple process, no large stress concentration defects and strong adaptability is needed. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that there must be stress concentration areas or stress weak areas on the welds in the prior art, the centralizer cannot produce large deformations, otherwise the welds are prone to rupture and cause failure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a spliced casing elastic centralizer, including two collar rings, two row-connected bow-shaped centralizing pieces, a spliced elastic centralizer body, two casing bodies, and four casing collars. The two collar rings are used to fix the two row-connected bow-shaped centralizing pieces to form a complete centralizer. The four casing collars are used for the connection between the two casing bodies. The inner diameter of the four casing collars is larger than the outer diameter of the casing body, restricting the axial movement of the spliced elastic centralizer body along the two casing bodies;

[0007] The two row-connected bow-shaped centralizing pieces, with the middle of the bow-shaped centralizing piece protruding radially outwards;

[0008] The two collars are circular hoops, and the two row-connected bow-shaped centralizers are an integrated body of a semi-circular coupling and a centralizer, and the single centralizer is evenly distributed circumferentially;

[0009] The casing coupling with four integrated centralizers is semi-circular;

[0010] The spliced elastic centralizer body is spliced by the two row-connected bow-shaped centralizers. The end faces of the two row-connected bow-shaped centralizers spliced together are in the same plane as the end faces of the two collars. The four casing couplings are divided into two groups, and both groups of casing couplings are adhesively bonded to the inner side of the collar with strong glue.

[0011] As a preferred embodiment, a plurality of first movable rods are movably embedded inside the two row-connected bow-shaped centralizers. Arc-shaped pieces are fixedly installed on the opposite sides of the plurality of first movable rods, and the plurality of first movable rods are used to fix the arc-shaped pieces.

[0012] The technical effect of adopting the above further scheme is that the arc-shaped piece can be driven to move by the first movable rod.

[0013] As a preferred embodiment, pulling blocks are fixedly installed on the opposite sides of the plurality of first movable rods. Positioning columns are fixedly installed on the outer sides of the plurality of arc-shaped pieces. First return springs are fixedly installed on the opposite sides of the plurality of pulling blocks.

[0014] The technical effect of adopting the above further scheme is that the positioning column can slide outward inside the row-connected bow-shaped centralizer.

[0015] As a preferred embodiment, the plurality of positioning columns are movably embedded on the outer surface of the row-connected bow-shaped centralizer. The inner surfaces of the plurality of first return springs are movably sleeved on the outer surface of the first movable rod. A plurality of flange members are fixedly installed on one side of the two collars.

[0016] The technical effect of adopting the above further scheme is that the second movable rod can be fixed by the flange member.

[0017] As a preferred embodiment, the other ends of the plurality of first return springs are fixedly installed on the outer surface of the row-connected bow-shaped centralizer. Second movable rods are movably embedded inside the plurality of flange members.

[0018] The technical effect of adopting the above further scheme is that pulling the pulling block outward can drive the first return spring to extend.

[0019] As a preferred embodiment, a plurality of the flange members are used to fix the second movable rod, and a second return spring is fixedly installed inside each of the plurality of the second movable rods.

[0020] The technical effect of adopting the above further solution is that the second movable rod on the flange member can be pulled outward, so that the second return spring extends.

[0021] As a preferred embodiment, the inner surfaces of the plurality of the second return springs are movably sleeved on the outer surface of the second movable rod, and a connecting member is fixedly installed on one side of each of the plurality of the second movable rods facing each other.

[0022] The technical effect of adopting the above further solution is that the connecting member and the ball can be driven by the second movable rod to slide outward.

[0023] As a preferred embodiment, the other ends of the plurality of the second return springs are fixedly installed on the opposite sides of the flange member, and a ball is movably embedded in each of the plurality of the connecting members.

[0024] The technical effect of adopting the above further solution is that the splicing type elastic centralizer body can be pushed downward, so that the ball rolls, and then the splicing type elastic centralizer body slides downward on the outer surface of the casing body.

[0025] Compared with the prior art, the advantages and positive effects of the present utility model are as follows.

[0026] 1. When in use, the splicing type elastic centralizer body of the present utility model is not only convenient for workers to assemble through the sleeve ring, the row-connected bow-shaped centralizer pieces and the casing coupling structure, saving time and effort, but also adopts strong glue bonding and injection molding manufacturing, avoiding the stress concentration and heat affected zone that may occur during the welding process, reducing the risk of material damage and crack, and solving the problem that there must be a stress concentration area or a stress weak area on the weld in the prior art, and the centralizer cannot produce a large deformation, otherwise the weld is prone to rupture and failure.

[0027] 2. When in use, the splicing type elastic centralizer body of the present utility model can not only be quickly installed and accurately positioned on the casing body through structures such as the ball and the arc-shaped piece, with simple operation, reducing the installation time and improving the work efficiency, but also ensuring the close fit between the centralizer and the surface of the casing body under the combined action of the first return spring and the second return spring, improving the assembly stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a rear view three-dimensional structural schematic diagram of a splicing type casing elastic centralizer provided by the present utility model.

[0029] Figure 2 Partial three-dimensional structure schematic of a spliced casing elastic centralizer provided by the present utility model Figure 1 ;

[0030] Figure 3 Partial three-dimensional structure schematic of a spliced casing elastic centralizer provided by the present utility model Figure 2 ;

[0031] Figure 4 Partial three-dimensional structure schematic of a spliced casing elastic centralizer provided by the present utility model Figure 3 ;

[0032] Figure 5 Partial three-dimensional structure schematic of a spliced casing elastic centralizer provided by the present utility model Figure 4 。

[0033] Legend description:

[0034] 1. Spliced elastic centralizer body; 101. Sleeve ring; 102. Row-connected bow-shaped centralizing pieces; 103. Casing coupling; 2. Casing body; 3. First movable rod; 301. Arc-shaped piece; 302. Pulling block; 303. First return spring; 304. Positioning column; 305. Flange member; 306. Second movable rod; 307. Second return spring; 308. Connecting member; 309. Ball. Specific implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0036] Example 1, please refer to Figures 1-5, the present utility model provides a technical solution: a spliced casing elastic centralizer, which includes two collar rings 101, two row-connected bow-shaped centralizer pieces 102, a spliced elastic centralizer body 1, two casing bodies 2, and four casing collars 103. The two collar rings 101 are used to fix the two row-connected bow-shaped centralizer pieces 102 to form a complete centralizer. The four casing collars 103 are used for connecting the two casing bodies 2. The inner diameter of the four casing collars 103 is larger than the outer diameter of the casing body 2, restricting the movement of the spliced elastic centralizer body 1 along the axial direction of the two casing bodies 2. The two row-connected bow-shaped centralizer pieces 102 have a radially outward bulge in the middle of the bow-shaped centralizer piece. The two collar rings 101 are circular hoop-shaped. The two row-connected bow-shaped centralizer pieces 102 are an integrated body of a semi-circular collar and a centralizer piece, and the single centralizer piece is evenly distributed circumferentially. The four integrated centralizer-piece casing collars 103 are semi-circular. The spliced elastic centralizer body 1 is formed by splicing the two row-connected bow-shaped centralizer pieces 102. The end faces of the two spliced row-connected bow-shaped centralizer pieces 102 are in the same plane as the end faces of the two collar rings 101. The four casing collars 103 are divided into two groups, and both groups of casing collars 103 are adhesively bonded to the inner side of the collar rings 101 with strong glue.

[0037] In this embodiment, the collar ring 101 is a cylindrical part, which is a profile with a constant cross-sectional shape. During production, the mold is designed according to the size of the required part, and a plastic extruder is used to produce a longer profile, and then cut according to the required length. The two ends of the row-connected bow-shaped centralizer piece 102 are semi-circular rings, and the side is bow-shaped. During production and manufacturing, an injection mold needs to be designed and formed by a plastic injection molding machine. When assembling the spliced elastic centralizer body 1, two row-connected bow-shaped centralizer pieces 102 integrated with the casing collar 103 can be taken first, spliced into a whole according to the semi-circular cross-section of the casing collar 103, and then the inner side of the collar ring 101 is tightened with the outer side of the casing collar 103 to make the cross-sections of the casing collar 103 and the collar ring 101 in the same plane, and strong glue is used for bonding. After the glue solidifies, a firm and reliable structure and connection are formed, thus completing the assembly. And through the structure of the collar ring 101, the row-connected bow-shaped centralizer piece 102, and the casing collar 103, the spliced elastic centralizer body 1 is not only convenient for workers to assemble, saving time and effort, but also adopts strong glue bonding and injection molding manufacturing, avoiding the stress concentration and heat-affected zone that may occur during the welding process, and reducing the risk of material damage and cracks.

[0038] Example 2, as Figures 1-5As shown, a plurality of first movable rods 3 are movably embedded inside each of the two side-by-side bow-shaped centralizers 102. Arc-shaped pieces 301 are fixedly installed on one side of the plurality of first movable rods 3 facing each other. The plurality of first movable rods 3 are used to fix the arc-shaped pieces 301. Pulling blocks 302 are fixedly installed on the other side of the plurality of first movable rods 3 facing away from each other. Positioning columns 304 are fixedly installed on the outer sides of the plurality of arc-shaped pieces 301. First return springs 303 are fixedly installed on one side of the plurality of pulling blocks 302 facing each other. The plurality of positioning columns 304 are movably embedded on the outer surface of the side-by-side bow-shaped centralizer 102. The inner surfaces of the plurality of first return springs 303 are movably sleeved on the outer surface of the first movable rod 3. A plurality of flange members 305 are fixedly installed on one side of each of the two collar rings 101. The other ends of the plurality of first return springs 303 are fixedly installed on the outer surface of the side-by-side bow-shaped centralizer 102. A plurality of second movable rods 306 are movably embedded inside the plurality of flange members 305. The plurality of flange members 305 are used to fix the second movable rods 306. Second return springs 307 are fixedly installed inside the plurality of second movable rods 306. The inner surfaces of the plurality of second return springs 307 are movably sleeved on the outer surface of the second movable rod 306. Connecting pieces 308 are fixedly installed on one side of the plurality of second movable rods 306 facing each other. The other ends of the plurality of second return springs 307 are fixedly installed on the side of the flange member 305 facing away from each other. A plurality of balls 309 are movably embedded inside the plurality of connecting pieces 308.

[0039] In this embodiment, the staff can first pull the second movable rod 306 on the flange member 305 outward, thereby driving the connecting member 308 and the ball 309 to slide outward through the second movable rod 306, and at the same time driving the second return spring 307 to extend. Then, the spliced elastic centralizer body 1 is sleeved on the outer surface of the casing body 2, and the second movable rod 306 is released to enable the second return spring 307 to reset. The ball 309 is driven to move inward through the second movable rod 306 and the connecting member 308, so that the ball 309 fits against the outer surface of the casing body 2. After that, the pulling block 302 is pulled outward to drive the first return spring 303 to extend, and the arc-shaped piece 301 is driven to move outward through the first movable rod 3. At the same time, the positioning column 304 slides outward inside the row of arcuate centralizer pieces 102 and pushes the spliced elastic centralizer body 1 downward, causing the ball 309 to roll. As a result, the spliced elastic centralizer body 1 slides downward on the outer surface of the casing body 2. When it slides to the appropriate position, the pulling block 302 can be released to enable the first return spring 303 to reset, and then the arc-shaped piece 301 is driven to move inward through the first movable rod 3, so that the arc-shaped piece 301 fits against the outer surface of the casing body 2, improving the fitting degree between the spliced elastic centralizer body 1 and the casing body 2. Moreover, with structures such as the ball 309 and the arc-shaped piece 301, not only can the spliced elastic centralizer body 1 be quickly installed and accurately positioned on the casing body 2, the operation is simple, the installation time is reduced, and the work efficiency is improved. At the same time, under the combined action of the first return spring 303 and the second return spring 307, the tight fit between the centralizer and the surface of the casing body 2 is ensured, and the assembly stability is improved.

[0040] Working principle: During use, the collar 101 is a cylindrical part and a profile with a constant cross-sectional shape. During production, the mold is designed according to the dimensions of the required part, and a plastic extruder is used to produce a profile with a relatively long length, and then it is cut according to the required length. The two ends of the row-type bow-shaped centralizer 102 are semi-circular rings, and the side is bow-shaped. During production and manufacturing, an injection mold needs to be designed and formed by a plastic injection molding machine. When assembling the split-type elastic centralizer body 1, two row-type bow-shaped centralizers 102 integrated with the casing collar 103 can be taken first, and they are spliced into a whole according to the semi-circular cross-section of the casing collar 103. Then, the inner side of the collar 101 is tightened with the outer side of the casing collar 103, so that the cross-sections of the casing collar 103 and the collar 101 are in the same plane, and strong glue is used for bonding. After the glue solidifies, a firm and reliable structure and connection are formed, thus completing the assembly. Moreover, through the structures of the collar 101, the row-type bow-shaped centralizer 102, and the casing collar 103, the split-type elastic centralizer body 1 is not only convenient for workers to assemble, saving time and effort, but also uses strong glue bonding and injection molding manufacturing, avoiding the stress concentration and heat-affected zone that may occur during the welding process, and reducing the risk of material damage and cracks. During use, the worker can first pull the second movable rod 306 on the flange member 305 outward, and then drive the connecting member 308 and the ball 309 to slide outward through the second movable rod 306, while driving the second return spring 307 to extend. Then, the split-type elastic centralizer body 1 is sleeved on the outer surface of the casing body 2, and the second movable rod 306 is released to make the second return spring 307 reset. The ball 309 is driven to move inward through the second movable rod 306 and the connecting member 308, so that the ball 309 fits on the outer surface of the casing body 2. After that, the pulling block 302 is pulled outward, driving the first return spring 303 to extend, and driving the arc-shaped piece 301 to move outward through the first movable rod 3. At the same time, the positioning column 304 slides outward inside the row-type bow-shaped centralizer 102 and pushes the split-type elastic centralizer body 1 downward, making the ball 309 roll, and then the split-type elastic centralizer body 1 slides downward on the outer surface of the casing body 2. When it slides to the appropriate position, the pulling block 302 can be released to make the first return spring 303 reset, and then drive the arc-shaped piece 301 to move inward through the first movable rod 3, so that the arc-shaped piece 301 fits on the outer surface of the casing body 2, improving the fitting degree between the split-type elastic centralizer body 1 and the casing body 2. Moreover, through structures such as the ball 309 and the arc-shaped piece 301, not only can the split-type elastic centralizer body 1 be quickly installed and accurately positioned on the casing body 2, with simple operation, reduced installation time, and improved work efficiency, but also under the combined action of the first return spring 303 and the second return spring 307, the tight fit between the centralizer and the surface of the casing body 2 is ensured, improving the stability of the assembly.

[0041] As described above, it is only the preferred embodiment of the present utility model, and does not impose other forms of limitations on the present utility model. Any person skilled in the relevant art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A spliced ​​casing elastic centralizer, comprising two collars (101) and two linked arched centralizer pieces (102), a spliced ​​elastic centralizer body (1), two casing bodies (2), and four casing collars (103), characterized in that: The two collars (101) are used to fix the two linked arched straightening pieces (102) to form a complete straightener, and the four casing collars (103) are used to connect the two casing bodies (2). The inner diameters of the four casing collars (103) are larger than the outer diameters of the casing bodies (2), so as to limit the axial movement of the spliced ​​elastic straightener body (1) along the two casing bodies (2); Two linked arched straightening pieces (102), the middle of the arched straightening pieces protruding radially outwards; The two sleeve rings (101) are annular hoops, the two linked arched straightening plates (102) are integrated bodies of semicircular collars and straightening plates, and the single straightening plates are evenly distributed along the circumferential direction; The casing collars (103) with four integrated centralizing plates are semicircular; The spliced ​​elastic centralizer body (1) is formed by splicing two row-type arched centralizing plates (102), the end faces of the two row-type arched centralizing plates (102) being spliced ​​together are in the same plane as the end faces of the two sleeve rings (101), and the four sleeve couplings (103) are divided into two groups, and the two groups of sleeve couplings (103) are both bonded to the inner side of the sleeve ring (101) with strong glue.

2. The spliced ​​casing elastic centralizer according to claim 1, characterized in that: A plurality of first movable rods (3) are movably embedded in the interior of the two linked arched straightening plates (102), and an arc-shaped plate (301) is fixedly mounted on one side opposite to the plurality of first movable rods (3), and the plurality of first movable rods (3) are used to fix the arc-shaped plate (301).

3. The spliced ​​casing elastic centralizer according to claim 2, characterized in that: A pulling block (302) is fixedly mounted on the opposite side of the plurality of first movable rods (3), a positioning column (304) is fixedly mounted on the outer side of the plurality of arc-shaped pieces (301), and a first return spring (303) is fixedly mounted on the opposite side of the plurality of pulling blocks (302).

4. The spliced ​​casing elastic centralizer according to claim 3, characterized in that: The plurality of positioning posts (304) are movably embedded in the outer surface of the row-type bow-shaped straightening plates (102), the inner surfaces of the plurality of first return springs (303) are movably sleeved on the outer surface of the first movable rod (3), and a plurality of flanges (305) are fixedly mounted on one side of the two collars (101).

5. The spliced ​​casing elastic centralizer according to claim 4, characterized in that: The other ends of the plurality of first return springs (303) are fixedly mounted on the outer surface of the row-type bow-shaped straightening pieces (102), and second movable rods (306) are movably embedded inside the plurality of flanges (305).

6. The spliced ​​casing elastic centralizer according to claim 5, characterized in that: The plurality of flange members (305) are used to fix the second movable rod (306), and a second return spring (307) is fixedly installed inside the plurality of second movable rods (306).

7. The spliced ​​casing elastic centralizer according to claim 6, characterized in that: The inner surfaces of the plurality of second return springs (307) are movably sleeved on the outer surface of the second movable rod (306), and the opposite sides of the plurality of second movable rods (306) are fixedly mounted with connecting pieces (308).

8. The spliced ​​casing elastic centralizer according to claim 7, characterized in that: The other ends of the plurality of second return springs (307) are fixedly mounted on the opposite side of the flange (305), and balls (309) are movably embedded inside the plurality of connecting members (308).

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