Internal winding type check ring

Abstract

The internal winding type check ring comprises an inner ring and an outer ring which are connected internally and externally through threads, a winding slope is arranged at the end of the outer surface of the inner ring, a cutting groove is formed in the winding slope, external threads are further arranged on the outer surface of the inner ring, and resistance-increasing annular teeth are arranged at the positions, corresponding to the winding slope, of the inner surface of the inner ring. Crescent wrench operation holes are formed in one end of the outer ring along the circumference of the outer ring, internal threads and a pressing inclined face are arranged on the inner surface of the outer ring, the internal threads of the outer ring are matched with the external threads of the inner ring, the pressing inclined face of the outer ring and the winding inclined face of the inner ring are correspondingly contacted and pressed, and the pressing inclined face and the inner winding inclined face are conical faces with the same conicity. According to the invention, a winding and holding scheme is adopted, the holding force is large, the installation is convenient and fast, the concentricity is good, the product processing precision is high, the operation time is effectively shortened, and the high-quality well cementation quality is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling and cementing equipment and relates to an inner winding stop ring. Background Art

[0002] In cementing operations, a fixing device, a stop ring, needs to be installed non-destructively on the outside of the casing. The stop ring can ensure that the casing accessories are firmly kept in the pre-installed position without axial movement, ensuring high-quality cementing quality.

[0003] At present, the stop rings used in the market mostly adopt a top screw stop structure. According to the holding force requirements, a large number of top screws need to be set. The on-site installation process is cumbersome, the operation time is long, the operation consistency is poor, the concentricity with the casing is poor, and the top screws cause different degrees of indentation on the casing. There is also a risk of falling off and falling into the well during the installation process. Different operators have different top screw installation strengths, which will cause the stop ring to be installed non-concentrically with the casing, and the casing centralizer to be overloaded, resulting in difficulties in lowering the casing, slow lowering speed, and insufficient centering of the casing in the wellbore during cementing. The cementing quality is reduced, and the consequences of cementing failure or oil and gas cross-layers affect the cementing quality. Summary of the invention

[0004] The purpose of the present invention is to provide an inner winding stop ring, which solves the problems of poor concentricity of the stop ring and easy falling off of the top screw in the prior art.

[0005] The technical solution adopted by the present invention is that the inner winding stop ring comprises an inner ring and an outer ring connected by threads inside and outside, a winding bevel is arranged at the end of the outer surface of the inner ring, the winding bevel is arranged with a cutting groove, the outer surface of the inner ring is also arranged with an external thread, and a resistance increasing annular tooth is arranged at a position corresponding to the winding bevel on the inner surface of the inner ring, a crescent wrench operating hole is arranged along the circumference of one end of the outer ring, an internal thread and a clamping bevel are respectively arranged on the inner surface of the outer ring, the internal thread of the outer ring matches the external thread of the inner ring, the clamping bevel of the outer ring and the winding bevel of the inner ring are in contact and clamped in correspondence, and the clamping bevel and the inner winding bevel are conical surfaces with the same taper.

[0006] The present invention is also characterized in that: The outer surface of the inner ring is provided with a winding bevel and a crescent wrench operating hole. The inner ring is provided with a plurality of crescent wrench operating holes, and the plurality of crescent wrench operating holes are evenly arranged on the same circumference.

[0007] The cutting groove is a spiral track or a parallel track. When the cutting groove is a spiral track, the cutting groove has the same rotation direction as the external thread.

[0008] The cutting groove is a single-end track, a double-end track or a multi-end track, and a strain notch is arranged at the connecting end of the cutting groove and the inner ring.

[0009] The cutting groove width is 0.5mm-5mm.

[0010] The resistance-increasing annular teeth are continuous or discontinuous. When the resistance-increasing annular teeth are discontinuous, a discontinuous gap is arranged between two adjacent resistance-increasing annular teeth.

[0011] The taper of the pressing slope and the inner winding slope is 5°-30°.

[0012] There is one inner ring and two outer rings. The outer surfaces of both ends of the inner ring are provided with winding inclined surfaces. The pressing inclined surfaces of the two outer rings are respectively in contact with and pressed against the two winding inclined surfaces of the inner ring. The two outer rings are symmetrically arranged at both ends of the inner ring.

[0013] There are two inner rings and two outer rings, each of the two inner rings is fixedly connected to an outer ring, and the two outer rings are symmetrically distributed.

[0014] The inner ring is made of elastic material.

[0015] The beneficial effects of the present invention are: The internal winding stop ring of the present invention aims at solving the problems of the stop ring currently used in the market, such as complicated on-site installation process, long operation time, poor operation consistency, poor concentricity with the casing, different degrees of indentation caused by the top screw on the casing, easy fall-off of the top screw, different strength of the top screw installation by the operators, resulting in the installation of the stop ring and the casing being not concentric, the casing straightener being subjected to eccentric load, resulting in difficulty in lowering the casing, slow lowering speed, and insufficient centering of the casing in the wellbore during cementing. The internal winding stop ring of the present invention adopts a winding and clamping scheme with high clamping force, convenient and quick installation, good concentricity, high product processing precision, and effectively shortens the operation time to ensure high-quality cementing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a schematic diagram of the structure of an inner winding stop ring embodiment 2 of the present invention; Figure 2 2 is a schematic structural diagram of an embodiment 3 of an inner winding bidirectional stop ring of the present invention; Figure 3 2 is a schematic structural diagram of an embodiment 4 of an inner winding bidirectional stop ring of the present invention; Figure 4 2 is a schematic structural diagram of an embodiment 5 of an inner winding stop ring of the present invention; Figure 5 2 is a schematic structural diagram of an internal winding stop ring embodiment 6 of the present invention; Figure 6 2 is a schematic structural diagram of an embodiment 7 of an inner winding stop ring of the present invention; Figure 7 2 is a schematic structural diagram of an embodiment 8 of an inner winding stop ring of the present invention; Figure 8 It is a schematic structural diagram of embodiment 9 of the inner winding stop ring of the present invention.

[0017] In the figure, 1. inner ring, 2. outer ring, 3. winding slope, 4. pressing slope, 5. resistance-increasing annular teeth, 6. crescent wrench operating hole, 7. cutting groove, 8. strain notch, 9. intermittent notch. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1 The present embodiment provides an inner winding stop ring, comprising an inner ring 1 and an outer ring 2 connected inside and outside by threads, a winding bevel 3 is arranged at the end of the outer surface of the inner ring 1, and the winding bevel 3 is provided with a cutting groove 7, and the outer surface of the inner ring 1 is also provided with an external thread, and the inner surface of the inner ring 1 and the winding bevel 3 are provided with resistance-increasing annular teeth 5 at a position corresponding to the winding bevel 3, and the resistance-increasing annular teeth 5 are used to increase friction, and a crescent wrench operating hole 6 is arranged along the circumference of one end of the outer ring 2, and the inner surface of the outer ring 2 is respectively provided with an internal thread and a clamping bevel 4, and the internal thread of the outer ring 2 matches the external thread of the inner ring 1, and the clamping bevel 4 of the outer ring and the winding bevel 3 of the inner ring are correspondingly contacted and clamped, and the clamping bevel 4 and the inner winding bevel 3 are conical surfaces with the same taper, and the taper of the clamping bevel 4 and the inner winding bevel 3 is 5°, and the inner ring 1 is made of elastic material to allow it to be elastically deformed and wound.

[0020] By screwing the outer ring 2 and the inner ring 1, the pressing bevel 4 on the inner side of the outer ring 2 gradually contacts with the winding bevel 4 at the end of the inner ring 1. Through the rotational sliding action of the two contact surfaces and the pressing action of the two bevels, the winding bevel 3 and the surface of the workpiece pipe are fully fitted. At the same time, the annular teeth 5 on the inner surface of the inner ring 1 penetrate into the outer surface of the workpiece pipe to achieve a clamping effect.

[0021] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0022] Example 2 This embodiment provides an inner winding stop ring, such as Figure 1 As shown, on the basis of Example 1, a winding slope 3 is provided on the outer surface of one end of the inner ring 1, and a crescent wrench operating hole 6 is opened along its circumference at the other end. The inner ring 1 is provided with a plurality of crescent wrench operating holes 6, which are evenly arranged on the same circumference, and the outer ring 2 is also provided with a plurality of crescent wrench operating holes 6, which are evenly arranged on the same circumference.

[0023] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0024] Example 3 This embodiment provides an inner winding stop ring, such as Figure 2 As shown, on the basis of Example 1, there is one inner ring 1 and two outer rings 2, and winding bevels 3 are arranged on the outer surfaces at both ends of the inner ring 1. The clamping bevels 4 of the two outer rings 2 are respectively in contact with and clamped with the two winding bevels 3 of the inner ring 1, and the tapers of the clamping bevels 4 and the inner winding bevels 3 are 30°. The two outer rings 2 are symmetrically arranged at the two ends of the inner ring 1, and the outer rings 2 at the two ends of the inner ring 1 are screwed so that the annular cut winding bevels 3 arranged on the inner ring 1 are respectively circumferentially contracted and gradually wrapped around the casing or pipe fitting, and at the same time, the resistance-increasing annular teeth 5 on the inner surface of the inner ring 1 are inserted into the outer surface of the casing or pipe fitting to achieve two-way locking.

[0025] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0026] Example 4 This embodiment provides an inner winding stop ring, such as Figure 3 As shown, on the basis of Example 3, a plurality of crescent wrench operating holes 6 are opened along the circumference of the middle portion of the outer surface of the inner ring 1, and the plurality of crescent wrench operating holes 6 are evenly located on the same circumference.

[0027] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0028] Example 5 This embodiment provides an inner winding stop ring, such as Figure 4 As shown, on the basis of Example 2, the resistance-increasing annular tooth 5 is continuous; the cutting groove 7 is a parallel trajectory, and the cutting groove 7 is a multi-start trajectory, the width of the cutting groove 7 is 0.5 mm, and a strain notch 8 is provided at the connecting end of the cutting groove 7 and the inner ring 1. During the locking process, the stress notch 8 is deformed, which is more conducive to the locking of the inner ring 1.

[0029] The inner ring 1 is screwed through the compression bevel 4 of the outer ring 2, so that the annular cut winding bevel 3 arranged on the inner ring 1 shrinks circumferentially and is gradually wound on the sleeve or pipe fitting, and at the same time, the resistance-increasing annular teeth 5 on the inner surface of the inner ring 1 are inserted into the outer surface of the sleeve or pipe fitting.

[0030] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0031] Example 6 This embodiment provides an inner winding stop ring, such as Figure 5 As shown, on the basis of Example 2, the resistance-increasing annular teeth 5 are continuous; the cutting groove 7 is set to a single head, the cutting groove 7 is set to a parallel track, the width of the cutting groove 7 is 5 mm, and a strain notch 8 is set at the connection between the cutting groove 7 and the inner ring 1. During the locking process, the stress notch 8 is deformed, which is more conducive to the locking of the inner ring 1; the end face of the outer ring 2 is evenly provided with crescent wrench operating holes 6 for installation, and an internal thread and a clamping bevel 4 are provided inside; the inner ring 1 is screwed through the clamping bevel 4 of the outer ring 2, so that the annular cut winding bevel 3 set on the inner ring 1 shrinks circumferentially and is gradually wrapped around the sleeve or pipe fitting, and at the same time, the resistance-increasing annular teeth 5 on the inner surface of the inner ring 1 are inserted into the outer surface of the sleeve or pipe fitting.

[0032] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0033] Example 7 This embodiment provides an inner winding stop ring, such as Figure 6 As shown, on the basis of Example 2, the cutting groove 7 is set as a single head, the cutting groove 7 is set as a spiral track, the cutting groove 7 has the same rotation direction as the external thread, the cutting groove 7 has a width of 2.5 mm, and the inner ring 1 is screwed through the tightening bevel of the outer ring 2, so that the cutting winding bevel set on the inner ring 1 shrinks circumference and is gradually wound on the sleeve or pipe fitting.

[0034] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0035] Example 8 This embodiment provides an inner winding stop ring, such as Figure 7 As shown, on the basis of Example 2, the cutting groove 7 is set as a double-head, the cutting groove 7 is set as a spiral track, the cutting groove 7 is in the same direction as the thread, and the inner ring 1 is screwed through the tightening bevel of the outer ring 2, so that the cutting winding bevel set on the inner ring 1 shrinks circumference and is gradually wound on the sleeve or pipe fitting.

[0036] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0037] Example 9 This embodiment provides an inner winding stop ring, such as Figure 8As shown, on the basis of Example 2, the resistance-increasing annular teeth 5 are discontinuous, and discontinuous notches 9 are arranged between two adjacent resistance-increasing annular teeth 5. The inner ring 1 is screwed through the tightening inclined surface of the outer ring 2, and the resistance-increasing discontinuous teeth arranged in the cut winding inclined surface on the inner ring 1 are easier to wind around and pierce into the sleeve or pipe fitting, providing a better locking effect.

[0038] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

[0039] Example 10 The present embodiment provides an inner winding stop ring. On the basis of Embodiment 1, there are two inner rings 1 and two outer rings 2, and the two inner rings 1 are each fixedly connected to an outer ring 2, that is, the clamping bevel 4 of the outer ring and the corresponding winding bevel 3 of the inner ring are in contact and clamped, and the taper of the clamping bevel 4 and the inner winding bevel 3 is 15°. The two outer rings 2 are symmetrically distributed, and the two inner rings 1 and the two outer rings 2 form an integral combination, providing greater clamping force in two directions.

[0040] This embodiment only represents a preferred implementation of the inner wrapping stop ring of the present invention. Any inner wrapping stop ring designed with similar technical features to the present invention will fall within the protection scope of the inner wrapping stop ring of the present invention.

Claims

1. Internal winding stop ring, characterized in that: The invention comprises an inner ring (1) and an outer ring (2) connected by threads inside and outside, wherein a winding bevel (3) is arranged at the end of the outer surface of the inner ring (1), and the winding bevel (3) is provided with a cutting groove (7). The outer surface of the inner ring (1) is also provided with an external thread, and a resistance-increasing annular tooth (5) is arranged at a position corresponding to the inner surface of the inner ring (1) and the winding bevel (3). A crescent wrench operating hole (6) is arranged along the circumference of one end of the outer ring (2), and an inner surface of the outer ring (2) is respectively provided with an internal thread and a pressing bevel (4), wherein the internal thread of the outer ring (2) matches the external thread of the inner ring (1), and the pressing bevel (4) of the outer ring and the winding bevel (3) of the inner ring are contacted and pressed correspondingly, and the pressing bevel (4) and the inner winding bevel (3) are conical surfaces with the same taper.

2. The inner winding stop ring according to claim 1, characterized in that: The outer surface of the inner ring (1) is provided with a winding bevel (3) and a crescent wrench operating hole (6); the inner ring (1) is provided with a plurality of crescent wrench operating holes (6), and the plurality of crescent wrench operating holes (6) are evenly arranged on the same circumference.

3. The inner winding stop ring according to claim 1, characterized in that: The cutting groove (7) is a spiral track or a parallel track. When the cutting groove (7) is a spiral track, the cutting groove (7) has the same rotation direction as the external thread.

4. The inner winding stop ring according to claim 3, characterized in that: The cutting groove (7) is a single-end track, a double-end track, or a multi-end track, and a strain notch (8) is provided at the connecting end of the cutting groove (7) and the inner ring (1).

5. The inner winding stop ring according to claim 1, characterized in that: The cutting groove (7) has a width of 0.5 mm to 5 mm.

6. The inner winding stop ring according to claim 1, characterized in that: The resistance-increasing annular teeth (5) are continuous or discontinuous. When the resistance-increasing annular teeth (5) are discontinuous, a discontinuous notch (9) is provided between two adjacent resistance-increasing annular teeth (5).

7. The inner winding stop ring according to claim 1, characterized in that: The tapers of the pressing inclined surface (4) and the inner winding inclined surface (3) are 5°-30°.

8. The inner winding stop ring according to claim 1, characterized in that: There is one inner ring (1) and two outer rings (2); winding bevels (3) are provided on the outer surfaces of both ends of the inner ring (1); the pressing bevels (4) of the two outer rings (2) are respectively in contact with and pressed against the two winding bevels (3) of the inner ring (1); and the two outer rings (2) are symmetrically arranged at the two ends of the inner ring (1).

9. The inner winding stop ring according to claim 2, characterized in that: There are two inner rings (1) and two outer rings (2), each of the two inner rings (1) is fixedly connected to an outer ring (2), and the two outer rings (2) are symmetrically distributed.

10. The inner winding stop ring according to claim 1, characterized in that: The inner ring (1) is made of elastic material.

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