Quick-mounting casing centralizer stop ring and its installation tool

Abstract

The present application belongs to the technical field of oil and gas well cementing, and particularly relates to a quick-mounting casing centralizer stop ring and a mounting tool thereof, aiming at solving the problems of complicated operation, small clamping force, easy sliding and damage to the casing of the existing centralizer stop device. The present application provides a quick-mounting casing centralizer stop ring, which comprises a first stop body and a second stop body. The first stop body is sleeved on the outside of the casing, and the second stop body is matched with the first stop body. The first stop body comprises a plurality of split claws arranged in an array along the circumference. When the second stop body moves away from the first stop body, the split claws are deformed inwardly under the extrusion of the second stop body to press the casing and form a larger clamping force. The special mounting tool of the present application adopts a hydraulic plunger linkage mechanism, which is compact in design, light in weight and convenient for transportation and installation, so that the installation operation of the stop ring is simple, the damage to the casing is small, and the compression resistance level and safety factor of the casing string in the cementing operation can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas well cementing, and particularly relates to a fast-mounted casing centralizer stop ring and a mounting tool thereof. BACKGROUND

[0002] The casing centralizer is an important device commonly used in the field of oil and gas exploration, and its main function is to ensure that the casing can be centered in the wellbore to reduce the possibility of sticking between the casing and the well wall during lowering, ensure uniform distribution of the cement sheath, and improve the cementing quality.

[0003] The commonly used casing centralizer stop ring on the market is mainly fixed on the casing by tightening a large number of locking screws. In order to improve the clamping force of the stop ring on the casing, the number and distribution of the locking screws are increased on site. Although this method can improve the clamping force, it causes too much damage to the casing, reduces the overall compression level and safety factor of the casing, and is time-consuming and labor-intensive during installation on site due to the large number of top screws. SUMMARY

[0004] In order to solve the above problems in the prior art, i.e., to solve the problems of complex operation, small clamping force, easy sliding, and damage to the casing of the centralizer stop device in the prior art, the present application provides a fast-mounted casing centralizer stop ring in a first aspect, which comprises a first stop body and a second stop body, both of which are tubular structures.

[0005] The first stop body and the second stop body are respectively provided with a first assembly part and a second assembly part at the end close to each other; the first assembly part comprises a plurality of split claws arranged in a circumferential interval, which gradually decrease radially in the direction close to the second assembly part,

[0006] The outer surface of the split claw is provided with a plurality of annular reverse teeth arranged in sequence along the length direction of the first stop body at one end away from the second assembly part, and the plurality of annular reverse teeth form a reverse tooth structure; the inner surface of the split claw is provided with an inner tooth structure at one end close to the second assembly part; the second assembly part matches the first assembly part, and the inner diameter of the second assembly part is greater than the outer diameter of the first assembly part;

[0007] In the assembled state, the second stop body is sleeved outside the first stop body, and when the second stop body moves in the axial direction away from the first stop body, the split claws of the first stop body are inwards contracted and deformed under the extrusion of the second stop body.

[0008] In some preferred technical solutions, the cross section of the inner tooth structure is a right-angled triangular structure.

[0009] In some preferable technical solutions, the inner tooth structure is a trapezoidal structure.

[0010] In some preferable technical solutions, the first assembly part comprises a reverse tooth structure, a first variable height structure, a horizontal structure and a second variable height structure arranged in sequence, the first variable height structure is a continuous variable low structure towards the horizontal structure, and the second variable height structure is a continuous variable low structure away from the horizontal structure.

[0011] In some preferable technical solutions, the second assembly part comprises a one-way reverse tooth structure, an annular groove structure and a third variable height structure connected in sequence, the inner diameter of the annular groove structure is the same as the maximum inner diameter of the one-way reverse tooth structure, and the third variable height structure is a continuous variable low structure away from the first assembly part.

[0012] The second aspect of the present application provides a quick-mounting casing centralizer stop ring installation tool, which is used for installing the quick-mounting casing centralizer stop ring in any of the above technical solutions. The installation tool comprises a first fixed ring assembly, a second fixed ring assembly, a third fixed ring assembly and a telescopic assembly. The first fixed ring assembly, the second fixed ring assembly and the third fixed ring assembly are arranged at intervals. The telescopic assembly comprises a fixed part and a movable part. The first fixed ring assembly and the second fixed ring assembly are connected with the fixed part, and the third fixed ring assembly is fixed to the movable part. The telescopic assembly can drive the third fixed ring assembly to move close to or away from the second fixed ring assembly. The first fixed ring assembly, the second fixed ring assembly and the third fixed ring assembly can be opened and closed.

[0013] In some preferable technical solutions, the telescopic assembly comprises a plurality of plunger bodies arranged at intervals. The fixed part is a plunger body, the movable part is a plunger rod, the plunger rod is telescopically arranged in the plunger body, and the plunger rod and the plunger body are connected through an elastic element.

[0014] In some preferable technical solutions, the plunger body is provided with a liquid injection hole. An external liquid storage tank is in communication with the inside of the plunger body through the liquid injection hole, so as to inject liquid into the inside of the plunger body and drive the plunger rod to move.

[0015] In some preferable technical solutions, the first fixed ring assembly and the second fixed ring assembly are each provided with a plunger body fixing part. A limiting plug is arranged in the plunger body fixing part. The plunger body is installed in the plunger body fixing part through the limiting plug.

[0016] In some preferable technical solutions, both open and close ends of the first fixed ring assembly are provided with handles. In the assembled state of the first fixed ring assembly, the two handles are fixed through detachable connecting pieces.

[0017] Advantages of the present application:

[0018] The quick-mounting casing centralizer retainer ring of the present application does not need locking screws for fixation, but uses interference fit to extrude the inner teeth of the split claw on the casing surface, forming a larger clamping force, and the maximum clamping force can reach 10 to 20 times of the conventional retainer ring clamping. The special installation tool uses four sets of hydraulic plunger linkage mechanisms, which are compact, light and convenient for transportation and installation. The retainer ring is easy to operate, time-saving, and has small damage to the casing, which can improve the compression level and safety factor of the casing string in cementing operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the following drawings:

[0020] Figure 1 The assembly structure sectional view of the quick-mounting casing centralizer retainer ring of one embodiment of the present application;

[0021] Figure 2 The structure schematic diagram of the first retainer body in one embodiment of the present application;

[0022] Figure 3 The partial enlarged schematic diagram of the first retainer body in one embodiment of the present application;

[0023] Figure 4 The structure schematic diagram of the second retainer body in one embodiment of the present application;

[0024] Figure 5 The partial enlarged schematic diagram of the second retainer body in one embodiment of the present application;

[0025] Figure 6 The structure schematic diagram of the quick-mounting casing centralizer retainer ring installation tool of one embodiment of the present application;

[0026] Figure 7 The schematic diagram of the quick-mounting casing centralizer retainer ring installation tool installing the quick-mounting casing centralizer retainer ring of one embodiment of the present application;

[0027] LIST OF REFERENCE NUMERALS:

[0028] 100-casing; 200-first stop body, 210-segmented claw, 220-inverted tooth structure, 230-inner tooth structure, 240-first variable height structure, 250-horizontal structure, 260-second variable height structure, 300-second stop body, 310-one-way inverted tooth structure, 320-annular groove structure, 330-third variable height structure; 400-first fixed ring assembly; 500-second fixed ring assembly; 600-third fixed ring assembly; 700-plunger, 710-plunger body, 720-plunger rod, 730-upper limit plug, 740-lower limit plug, 750-guide rod; 800-handle. DETAILED DESCRIPTION

[0029] In order to make the embodiments, technical solutions and advantages of the present application more obvious, the technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0030] The fast-assembly casing centralizer stop ring of the present application comprises a first stop body and a second stop body, and both the first stop body and the second stop body are tubular structures;

[0031] The first stop body and the second stop body are respectively provided with a first assembly part and a second assembly part at the end close to each other; the first assembly part comprises a plurality of segmented claws arranged in a circumferential interval, and the segmented claws gradually decrease in the radial direction close to the second assembly part,

[0032] The outer surface of the segmented claw is provided with a plurality of annular inverted teeth arranged in sequence along the length direction of the first stop body at the end away from the second assembly part, and the plurality of annular inverted teeth form an inverted tooth structure; the inner surface of the segmented claw is provided with an inner tooth structure at the end close to the second assembly part; the second assembly part is matched with the first assembly part, and the inner diameter of the second assembly part is greater than the outer diameter of the first assembly part;

[0033] In the assembled state, the second stop body is sleeved outside the first stop body, and when the second stop body moves in the axial direction away from the first stop body, the segmented claws of the first stop body are inturned and deformed under the extrusion of the second stop body.

[0034] In order to more clearly describe the fast-assembly casing centralizer stop ring of the present application, a preferred embodiment of the present application will be described in detail below in conjunction with the drawings.

[0035] As a preferred embodiment of the present application, the fast-assembly casing centralizer stop ring of the present application is as shown in the drawings. Figure 1As shown, the present application comprises a first stop body 200 and a second stop body 300, both of which are tubular structures, the first stop body 200 is sleeved outside the sleeve 100, and the second stop body 300 is sleeved outside the first stop body 200 and matched with the first stop body 200. Both the first stop body 200 and the second stop body 300 are made of steel material.

[0036] Further, referring to Figures 2-5 , the first stop body 200 and the second stop body 300 are respectively provided with a first assembly part and a second assembly part at the end close to each other; the first assembly part comprises a plurality of split claws 210 arranged in a circumferential interval, the split claws 210 gradually decrease radially in the direction close to the second assembly part, and the outer surface of the split claws 210 is provided with a plurality of annular reverse teeth arranged in sequence along the length direction of the first stop body 200 at one end away from the second assembly part, and the plurality of annular reverse teeth constitute a reverse tooth structure 220; the inner surface of the split claws 210 is provided with an inner tooth structure 230 at one end close to the second assembly part, and preferably, the cross section of the inner tooth structure is a right triangle structure. In other preferred embodiments, the cross section of the inner tooth structure is a trapezoidal structure.

[0037] The second assembly part is matched with the first assembly part, and the inner diameter of the second assembly part is greater than the outer diameter of the first assembly part, specifically, the first assembly part comprises a reverse tooth structure 220, a first variable height structure 240, a horizontal structure 250 and a second variable height structure 260 arranged in sequence, the first variable height structure 240 is a continuous variable low structure towards the horizontal structure 250, and the second variable height structure 260 is a continuous variable low structure away from the horizontal structure 250. The second assembly part comprises a one-way reverse tooth structure 310, an annular groove structure 320 and a third variable height structure 330 connected in sequence, the inner diameter of the annular groove structure 320 is the same as the maximum inner diameter of the one-way reverse tooth structure 310, and the third variable height structure 330 is a continuous variable low structure away from the first assembly part.

[0038] In the assembled state, the second stop body 300 is sleeved outside the first stop body 200, when the second stop body 300 moves in the axial direction away from the first stop body 200, the split claws of the first stop body 200 are deformed inwardly under the extrusion of the second stop body 300.

[0039] In some other embodiments, the quick-mounting casing centralizer stop ring is composed of a first stop body 200 and a second stop body 300; the first stop body is designed with a set of reverse teeth of the same size at the middle part, and then the double taper surface transitions to the lower end surface; and a set of 90° triangular teeth is designed inside the lower end surface; the first stop body is divided into several equal parts of the split claw from the reverse tooth root to the lower end surface. The second stop body is processed with reverse teeth of the same size inside, and then the taper surface transitions. When the first stop body and the second stop body are extruded under the action of external force, the inner taper surface of the second stop body extrudes the outer taper surface of the first stop body, and the split claw of the first stop body slowly deforms and shrinks inward. The inner teeth of the split block gradually contact the casing, and finally engage the surface of the casing to form a larger clamping force. At the same time, the outer reverse teeth of the first stop body engage with the inner reverse teeth of the second stop body, so that the first stop body and the second stop body are combined together. Specifically, the first stop body of the stop ring has a plurality of split claws, the outer side of the split claw is designed with one-way reverse teeth, the inner side is designed with 90° teeth, the second stop body of the stop ring is designed with one-way reverse teeth in the same direction as the first stop body, and the split claw of the first stop body of the stop ring is designed with a double taper surface, which first contacts the middle part after cooperating with the taper surface of the second stop body of the stop ring. After the engagement of the first stop body and the second stop body of the stop ring, under the action of the one-way teeth, it will not loosen.

[0040] The second aspect of the present application provides a mounting tool suitable for any of the above quick-mounting casing centralizer stop rings, referring to Figure 6 and Figure 7 The mounting tool includes a first fixed ring assembly 400, a second fixed ring assembly 500, a third fixed ring assembly 600, a telescopic assembly, the first fixed ring assembly 400, the second fixed ring assembly 500 and the third fixed ring assembly 600 are arranged at intervals, the telescopic assembly includes a fixed part and a movable part, the first fixed ring assembly 400 and the second fixed ring assembly 500 are connected with the fixed part, and the third fixed ring assembly 600 is fixed to the movable part; the telescopic assembly can drive the third fixed ring assembly 600 to approach or move away from the second fixed ring assembly 500, and the first fixed ring assembly 400, the second fixed ring assembly 500 and the third fixed ring assembly 600 can be arranged to be opened and closed. The three fixed rings are respectively hinged by two half rings, a plunger is installed between the first fixed ring assembly 400 and the second fixed ring assembly 500, the other end of the plunger rod is fixed with the third fixed ring assembly 600, and the lower end of the guide rod is connected with the lower fixed ring through threads and can move axially in the guide hole corresponding to the upper and lower fixed rings.

[0041] The telescopic assembly includes a plurality of plunger 700 arranged at intervals, the fixed part is a plunger body 710, the movable part is a plunger rod 720, the plunger rod 720 is telescopically arranged inside the plunger body 710, and the plunger rod 720 is connected with the plunger body 710 through an elastic element.

[0042] The plunger body 710 is provided with a liquid injection hole, and the external liquid storage tank is connected to the interior of the plunger body 710 through the liquid injection hole to inject liquid into the interior of the plunger body 710 and drive the plunger rod 720 to move.

[0043] Both the first fixed ring assembly 400 and the second fixed ring assembly 500 are provided with a plunger body fixing part, and a limit plug is provided in the plunger body fixing part. The plunger body 710 is installed in the plunger body fixing part through the limit plug. It can be understood that the plunger body fixing part of the first fixed ring assembly 400 is used to fix the upper limit plug 730, and the plunger body fixing part of the second fixed ring assembly 500 is used to fix the lower limit plug 740.

[0044] Both opening and closing ends of the first fixing ring assembly 400 are provided with handles 800. When the first fixing ring assembly 400 is assembled, the two handles 800 are fixed by detachable connectors.

[0045] Specifically, the two semicircular rings of the first fixing ring assembly form the upper fixing ring, each with one large and one small set of through holes. The two semicircular rings of the second fixing ring assembly form the middle fixing ring, with the same structure as the upper fixing ring. Four sets of plungers are installed between the upper and middle fixing rings. Each set of plungers consists of an upper limit plug, a plunger body, a spring, a plunger rod, and a lower limit plug. The upper limit plug is threaded to the upper end of the plunger body through the large through hole of the upper fixing ring, and the lower limit plug is threaded to the lower end of the plunger body through the large through hole of the middle fixing ring. The plunger rod is installed inside the plunger body through the lower limit plug, and a seal is used between them. A return spring is designed between the upper end of the plunger rod and the upper limit plug. When high-pressure liquid enters the plunger through the inlet hole on the plunger body, it pushes the plunger rod, compressing the spring upwards. After pressure is released, the plunger rod returns to its original position under the spring's restoring force. The lower end of the plunger rod is connected to the lower half of the fixing ring and secured with a nut. The lower fixing ring is also composed of two lower fixing rings and has two handles on the outside, secured by screws. One end of the guide rod is fixed to the lower fixing ring, and then passes through the small holes of the middle and upper fixing rings, remaining in a free state. Driven by the plunger rod, it can reciprocate. The special installation tool uses a four-set hydraulic plunger linkage mechanism to drive the lower fixing ring, generating a large thrust. The hydraulic plungers of the special installation tool are designed with return springs, automatically resetting after pressure release. The special installation tool has four handles on the outside for easy handling and operation by construction personnel. The installation tool adopts a two-part structure design, is lightweight, and convenient for transportation and installation.

[0046] In the installation, the quick-mounting first stop body 200 is first sleeved into the designed position on the sleeve 100, and then the quick-mounting second stop body 300 is sleeved. Two construction workers lift the special installation tool through the handle 800, place it in the position corresponding to the stop ring, make the stop ring between the second fixing ring assembly 500 and the third fixing ring assembly 600, close the clamp, and install the limiting bolt. Connect the hydraulic control pipeline, start the hydraulic pump, and high-pressure liquid enters the plunger through the liquid inlet hole on the plunger body 710, pushes the plunger rod 720 to go up, and drives the third fixing ring assembly 600 to go up. Under the pushing of the third fixing ring assembly 600, the quick-mounting stop ring first stop body 200 and the second stop body 300 are extruded to the middle, and under the extrusion force, the inner tapered surface of the second stop body 300 extrudes the outer tapered surface of the first stop body 200, and the split claw 210 of the first stop body 200 slowly deforms and shrinks inward. The inner teeth of the split claw 210 gradually contact the sleeve 100, and finally engage the surface of the sleeve 100 to form a large clamping force. At the same time, the reverse tooth structure 220 of the first stop body 200 engages with the one-way reverse tooth structure 310 of the second stop body 300, and after the special installation tool is removed, the two can be effectively prevented from loosening, the clamping force is reduced, and the sleeve 100 is fixed.

[0047] The technical solutions in the embodiments of the application have at least the following technical effects and advantages:

[0048] The quick-mounting sleeve centralizer stop ring of the application does not need to be fixed by locking screws, but uses interference fit to extrude the split claw inner teeth on the sleeve surface to form a large clamping force, and the maximum clamping force can reach 10 to 20 times of the clamping force of a conventional stop ring. The special installation tool uses four sets of hydraulic plunger linkage mechanisms, which are compact, light and convenient for transportation and installation. The stop ring is simple to operate, time-saving, and has small damage to the sleeve, and can improve the compression resistance level and safety factor of the sleeve string in well cementation operation.

[0049] It should be noted that in the description of the application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In addition, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The term "comprising" or any other similar word is intended to encompass a non-exclusive inclusion, so that a process, article, or apparatus / device including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent to such process, article, or apparatus / device.

[0052] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A fast-assembly casing centralizer stop ring, characterized in that, The first stop body and the second stop body are both tubular structures; The first stop body and the second stop body are respectively provided with a first assembly part and a second assembly part at the end close to each other; the first assembly part comprises a plurality of split claws arranged along the circumference; the split claws gradually decrease in the radial direction close to the second assembly part, The outer surface of the split claw is provided with a plurality of annular reverse teeth arranged in sequence along the length direction of the first stop body at one end away from the second assembly part; the plurality of annular reverse teeth form a reverse tooth structure; the inner surface of the split claw is provided with an inner tooth structure at one end close to the second assembly part; the second assembly part matches the first assembly part, and the inner diameter of the second assembly part is greater than the outer diameter of the first assembly part; In the assembled state, the second stop body is sleeved outside the first stop body; when the second stop body moves in the axial direction away from the first stop body, the split claws of the first stop body are deformed inwardly under the extrusion of the second stop body; The second assembly part comprises a one-way reverse tooth structure; the reverse tooth structure of the first stop body engages with the one-way reverse tooth structure of the second stop body. The first assembly part comprises a reverse tooth structure, a first variable height structure, a horizontal structure and a second variable height structure arranged in sequence; the first variable height structure is a continuous variable low structure towards the horizontal structure; and the second variable height structure is a continuous variable low structure away from the horizontal structure.

2. The fast-pack casing centralizer retainer ring of claim 1, wherein, The cross section of the inner tooth structure is a right triangle structure.

3. The fast-pack casing centralizer retainer ring of claim 1, wherein, The cross section of the inner tooth structure is a trapezoidal structure.

4. The fast dressed casing centralizer retainer ring of claim 1, wherein, The second assembly part comprises a one-way reverse tooth structure, an annular groove structure and a third variable height structure connected in sequence; the inner diameter of the annular groove structure is the same as the maximum inner diameter of the one-way reverse tooth structure; and the third variable height structure is a continuous variable low structure away from the first assembly part.

5. A fast-strap casing centralizer stop ring installation tool characterized by, The installation tool is used for installing the quick-mounting type casing centralizer stop ring, and comprises a first fixed ring assembly, a second fixed ring assembly, a third fixed ring assembly and a telescopic assembly; the first fixed ring assembly, the second fixed ring assembly and the third fixed ring assembly are arranged at intervals; the telescopic assembly comprises a fixed part and a movable part; the first fixed ring assembly and the second fixed ring assembly are connected with the fixed part, and the third fixed ring assembly is fixed to the movable part; the telescopic assembly can drive the third fixed ring assembly to move close to or away from the second fixed ring assembly; and the first fixed ring assembly, the second fixed ring assembly and the third fixed ring assembly are arranged to be openable and closable.

6. The fast-track casing centralizer retainer ring installation tool of claim 5, wherein, The telescopic assembly comprises a plurality of plunger barrels arranged at intervals; the fixed part is a plunger barrel; the movable part is a plunger rod; the plunger rod is telescopically arranged inside the plunger barrel; and the plunger rod and the plunger barrel are connected through an elastic element.

7. The fast-track casing centralizer retainer ring installation tool of claim 6, wherein, The plunger body is provided with a liquid injection hole, and an external liquid storage tank is communicated with the inside of the plunger body through the liquid injection hole, so as to inject liquid into the inside of the plunger body and drive the plunger rod to move.

8. The fast-track casing centralizer retainer ring installation tool of claim 7, wherein, The first fixed ring assembly and the second fixed ring assembly are both provided with a plunger body fixing part, a limiting plug is arranged in the plunger body fixing part, and the plunger body is installed in the plunger body fixing part through the limiting plug.

9. The fast-track casing centralizer retainer ring installation tool of claim 8, wherein, The two open ends of the first fixed ring assembly are both provided with a handle, and the two handles are fixed through detachable connecting pieces in the assembled state of the first fixed ring assembly.

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