Slurry-filling-free casing running floating coupling

Abstract

The invention belongs to the field of drilling and completion tools, and particularly relates to a floating coupling for casing running without tank slurry. Comprising a coupling body, a one-way valve and a rupture disk, the one-way valve and the rupture disk are sequentially arranged on the coupling body in the axial direction of the coupling body, the one-way valve penetrates through the coupling body, and the flowing direction of the one-way valve is from the outside of the coupling body to the inside of the coupling body. When the floating coupling is used for casing running, grouting into a casing string located on the upper portion of the floating coupling through a well mouth is not needed, the one-way valve of the floating coupling automatically grouts into the casing string located on the upper portion of the floating coupling through annular liquid, casing running grouting operation is reduced, and the floating coupling has the advantages of saving casing running operation time and improving casing running efficiency. The casing running operation efficiency is improved; and the construction risk is reduced.

Description

Technical Field

[0001] The invention belongs to the field of drilling and completion tools, and in particular relates to a tank-free slurry lowering casing floating coupling. Background Art

[0002] With the continuous advancement of drilling technology, the horizontal sections of oil and gas horizontal wells are getting longer and longer. When casing is run in horizontal wells with long horizontal sections, due to the irregular wellbore trajectory, large offset distance, and the requirement and limitation of centering the lower stabilizer, there are problems such as large running friction, long running time, and difficulty in running into place. Floating casing running technology is one of the most effective ways to solve the problem of difficulty in running casing in horizontal sections.

[0003] For this purpose, Chinese patents: CN207093025U, a middle-open circulating floating coupling, CN206972172U, a floating coupling device; Chinese patent application: CN108301788A, a floating coupling device; However, in actual use, after the floating couplings are connected to form a casing string, during the casing lowering process, grouting (drilling fluid) needs to be continuously poured into the casing string of the upper section of the floating coupling through the wellhead to increase the deadweight of the upper casing. The grouting (drilling fluid) process is not only cumbersome, but also increases the casing lowering time, affecting the casing lowering efficiency. At the same time, the longer the casing lowering time, the more risks and complex situations it brings to the well.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides a floating coupling for casing lowering without grouting tank. When the floating coupling of the present invention is used for casing lowering, there is no need to grout the casing string located above the floating coupling through the wellhead. The one-way valve of the floating coupling utilizes the annular space liquid to automatically grout the casing string located above the floating coupling, thereby reducing the grouting operation for casing lowering. It has the advantages of saving the operation time for casing lowering, improving the operation efficiency of casing lowering and reducing the construction risk.

[0006] The present invention includes the following technical solutions:

[0007] The present invention provides a tank-free casing floating coupling, comprising a coupling body, a one-way valve and a rupture disk. The one-way valve and the rupture disk are sequentially arranged on the coupling body along the axial direction of the coupling body. The one-way valve runs through the coupling body, and the flow direction of the one-way valve is from outside the coupling body to inside the coupling body.

[0008] Furthermore, it also includes an annular sleeve, which is fixed to the inner wall of the coupling body by a shear pin, and the annular sleeve and the rupture disk are respectively located on both sides of the one-way valve; the outer wall of the annular sleeve is provided with a wedge groove and a limiting boss, and a steel ball is provided in the wedge groove; the inner wall of the coupling body is provided with a limiting groove for cooperating with the limiting boss; after the annular sleeve slides toward the one-way valve, the limiting boss cooperates with the limiting groove to limit the annular sleeve.

[0009] Furthermore, the coupling body includes a first joint and a second joint; the first joint and the second joint are connected by a stop screw, the first joint is connected to the annular sleeve, and the limiting groove is arranged on the first joint; one end of the annular sleeve facing the second joint is fitted with the inner wall of the second joint; the second joint is connected to the one-way valve and the rupture disk.

[0010] Furthermore, the limiting groove is formed by the cooperation of the first joint and the second joint.

[0011] Furthermore, the wedge-shaped groove is arranged on the limiting boss.

[0012] Furthermore, a first sealing ring is provided on the contact surface between the limiting boss and the coupling body.

[0013] Further, the coupling body is provided with a one-way valve connecting hole; the one-way valve comprises a valve seat, a valve plate, a torsion spring and a piston, the two ends of the one-way valve connecting hole are respectively fixedly connected to the valve seat and movably connected to the piston, and the piston is located at one end close to the inner cavity of the coupling body; the valve seat and the piston are both provided with flow holes; the torsion spring is connected to the valve seat between the valve seat and the piston, and the torsion spring is connected to the valve plate;

[0014] In the initial state, the valve plate cover is arranged on the valve seat to close the one-way valve.

[0015] Furthermore, second sealing rings are provided on the inner wall of the coupling body at both sides of the one-way valve.

[0016] Furthermore, a plurality of the one-way valves are provided, and the plurality of the one-way valves are evenly and circumferentially arranged on the inner wall of the coupling body.

[0017] Furthermore, a third joint is included. One end of the coupling body close to the rupture disk is connected to the third joint. The coupling body and the third joint cooperate to form a rupture disk connection groove.

[0018] By adopting the above technical solution, the present invention has the following advantages:

[0019] When the floating coupling of the present invention is used for casing lowering, there is no need to grout the casing string located above the floating coupling through the wellhead. The one-way valve of the floating coupling utilizes the annular space liquid to automatically grout the casing string located above the floating coupling, thereby reducing the casing lowering grouting operation, saving the casing lowering operation time, improving the casing lowering operation efficiency and reducing the construction risk.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a half-section structure of a floating coupling for casing under slurry-free tank according to an embodiment of the present invention Figure 1 ;

[0023] Figure 2 for Figure 1 Schematic diagram of the local structure;

[0024] Figure 3 A schematic diagram of a half-section structure of a floating coupling for casing under slurry-free tank according to an embodiment of the present invention Figure 2 ;

[0025] In the figure, 10-coupling body, 11-first joint, 12-second joint, 13-stop screw, 20-check valve, 21-valve seat, 22-valve plate, 23-torsion spring, 24-piston, 30-rupture disk, 40-annular sleeve, 50-shear pin, 60-wedge groove, 70-limiting boss, 80-steel ball, 90-limiting groove, 100-first sealing ring, 110-second sealing ring, 120-third joint, 130-rupture disk connecting groove. DETAILED DESCRIPTION

[0026] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] This embodiment provides a non-tank slurry casing floating coupling, such as Figure 1 As shown, it includes a coupling body 10, a one-way valve 20 and a rupture disk 30. The one-way valve 20 and the rupture disk 30 are sequentially arranged on the coupling body 10 along the axial direction of the coupling body 10. The one-way valve 20 runs through the coupling body 10, and the flow direction of the one-way valve 20 is from the outside of the coupling body 10 to the inside of the coupling body 10.

[0029] It should be noted that the coupling body 10 is an annular cylindrical structure, which can be connected with other joints to form a casing string; the connection method between the coupling body 10 and other joints is preferably a male joint or a female joint, and of course, bolts, threads, etc. can also be used. It should also be noted that the connection methods of the coupling body 10 and other joints are conventional technologies in the art, and will not be described in detail here.

[0030] The floating coupling of the present invention forms a casing string after being connected with other joints. The one-way valve 20 provided can allow the liquid in the outer annulus between the casing string and the well wall to flow into the coupling body 10, so as to increase the deadweight of the casing string located on the upper part of the floating coupling, reduce the casing grouting operation, and have the advantages of saving the casing operation time, improving the casing operation efficiency and reducing the construction risk.

[0031] The rupture disk 30 can prevent the liquid in the casing string from flowing to the casing string at the lower end of the floating coupling, which can not only improve the grouting efficiency of the casing string above the floating coupling, but also avoid the increase of the deadweight of the casing string at the lower end of the floating coupling.

[0032] In some embodiments, the coupling body 10 is provided with a one-way valve connection hole, and the one-way valve 20 is connected in the one-way valve connection hole; Figure 2As shown, the one-way valve 20 includes a valve seat 21, a valve plate 22, a torsion spring 23 and a piston 24, the two ends of the one-way valve connecting hole are respectively fixedly connected to the valve seat 21 and movably connected to the piston 24, and the piston 24 is located at one end close to the inner cavity of the coupling body 10; the valve seat 21 and the piston 24 are both provided with flow holes; the torsion spring 23 is connected to the valve seat 21 between the valve seat 21 and the piston 24, and the torsion spring 23 is connected to the valve plate 22; in the initial state, the valve plate 22 is covered on the valve seat 21 to close the one-way valve 20; that is, in the initial state, the valve plate 22 is attached to the valve seat 21 by the action of the torsion spring 23, so that the flow hole on the valve seat 21 is closed, thereby closing the one-way valve 20. After the casing is lowered, the one-way valve 20 can be self-locked by pressurizing the wellhead (i.e., injecting high-pressure drilling fluid), isolating the floating coupling and the outer annulus, and realizing the sealing work of the floating coupling; after the one-way valve 20 is sealed, the wellhead continues to pressurize to break the rupture disk 30.

[0033] like Figure 2 As shown, during the casing lowering process of the floating coupling with the one-way valve 20, the liquid in the outer annulus impacts the valve plate 22, forming a pressure difference, so that the liquid enters the cavity where the valve plate 22 is located from the flow hole on the valve seat 21, and then enters the floating coupling through the flow hole of the piston 24.

[0034] In order to further improve the sealing effect of the one-way valve 20, in some embodiments, as Figure 3 As shown, it also includes an annular sliding sleeve 40, which is fixed on the inner wall of the coupling body 10 through a shear pin 50. Figure 3 As shown, the shear pin 50 is sealed by a sealing screw (it should be noted that the sealing screw is shown in the figure, but not marked in the figure); in the initial state, the annular sleeve 40 and the rupture disk 30 are respectively located on both sides of the one-way valve 20; the outer wall of the annular sleeve 40 is provided with a wedge groove 60 and a limiting boss 70, and a steel ball 80 is arranged in the wedge groove 60; the inner wall of the coupling body 10 is provided with a limiting groove 90 for cooperating with the limiting boss 70; after the annular sleeve 40 slides toward the one-way valve 20, the limiting boss 70 cooperates with the limiting groove 90 to limit the annular sleeve 40. Specifically, the first seal is achieved by pressurizing the one-way valve 20 to self-lock, and then the shear pin 50 is cut off by continuing to pressurize, and the annular sleeve 40 slides toward the one-way valve 20 to block the one-way valve 20 and achieve the second seal.

[0035] It should be noted that in a structure with an annular sleeve 40, the rupture disk 30 needs to be further pressurized and ruptured after the annular sleeve 40 achieves the second seal. The pressure required for the first seal < the pressure required for the second seal < the pressure required for the rupture disk 30 to rupture.

[0036] In the structure of the annular sleeve 40 , the actual one-way valve 20 may not have the first seal, and may be sealed only by the annular sleeve 40 .

[0037] The cooperation between the steel ball 80 and the wedge-shaped groove 60 has a stopping effect on the annular sleeve 40, so that the annular sleeve 40 has a better sealing effect. At the same time, when used in a horizontal well, the sealing failure of the annular sleeve 40 can be prevented.

[0038] In order to facilitate the installation of the annular sleeve 40, in some embodiments, Figure 3 As shown, the coupling body 10 includes a first joint 11 and a second joint 12; the first joint 11 and the second joint 12 are connected by a stop screw 13, the first joint 11 is connected to the annular sleeve 40, the limiting groove 90 is arranged on the first joint 11, and one end of the annular sleeve 40 facing the second joint 12 is fitted with the inner wall of the second joint 12; the second joint 12 is connected to the one-way valve 20 and the rupture disk 30.

[0039] like Figure 3 As shown, the joint of the first joint 11 is a female joint, and the joint of the second joint 12 is a male joint. The limit groove 90 is formed by the cooperation of the first joint 11 and the second joint 12; the first joint 11 and the second joint 12 are connected in the form of a male joint and a female joint and are also fixed by a stop screw 13.

[0040] In some embodiments, the wedge-shaped groove 60 is disposed on the limiting boss 70 .

[0041] In order to further improve the sealing effect of the annular sleeve 40, in some embodiments, as Figure 3 As shown, a first sealing ring 100 is provided on the contact surface between the limiting boss 70 and the coupling body 10 .

[0042] In order to further improve the sealing effect of the annular sleeve 40, in some embodiments, as Figure 1 As shown, a second sealing ring 110 is provided on the inner wall of the coupling body 10 on both sides of the one-way valve 20. Preferably, as Figure 1 As shown, the second sealing ring 110 is arranged on the second joint 12 .

[0043] In some embodiments, a plurality of the one-way valves 20 are provided, and the plurality of the one-way valves 20 are evenly and circumferentially arranged on the inner wall of the coupling body 10 , thereby improving the self-grouting efficiency and having the advantage of improving the casing running efficiency.

[0044] To facilitate installation of the rupture disk 30, in some embodiments, such as Figure 3As shown, a third joint 120 is further included. One end of the coupling body 10 close to the rupture disk 30 is connected to the third joint 120 . The coupling body 10 and the third joint 120 cooperate to form a rupture disk connection groove 130 .

[0045] In some embodiments, the rupture disk 30 is a conventional rupture disk 30, which helps to smoothly fracture the rupture disk 30 under a certain pressure without interfering with normal operation.

[0046] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of multiple components or the interaction relationship of multiple components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-tank slurry casing floating coupling, characterized in that: The invention comprises a coupling body (10), a one-way valve (20) and a rupture disk (30), wherein the one-way valve (20) and the rupture disk (30) are sequentially arranged on the coupling body (10) along the axial direction of the coupling body (10), the one-way valve (20) passes through the coupling body (10), and the flow direction of the one-way valve (20) is from the outside of the coupling body (10) to the inside of the coupling body (10).

2. The non-tank slurry casing floating coupling according to claim 1 is characterized in that: The invention also comprises an annular sleeve (40), wherein the annular sleeve (40) is fixed on the inner wall of the coupling body (10) by means of a shear pin (50), and the annular sleeve (40) and the rupture disk (30) are respectively located on both sides of the one-way valve (20); the outer wall of the annular sleeve (40) is provided with a wedge groove (60) and a limiting boss (70), and a steel ball (80) is arranged in the wedge groove (60); the inner wall of the coupling body (10) is provided with a limiting groove (90) for cooperating with the limiting boss (70); after the annular sleeve (40) slides toward the one-way valve (20), the limiting boss (70) cooperates with the limiting groove (90) to realize the limiting of the annular sleeve (40).

3. The non-tank slurry casing floating coupling according to claim 2 is characterized in that: The coupling body (10) comprises a first joint (11) and a second joint (12); the first joint (11) and the second joint (12) are connected by a stop screw (13); the first joint (11) is connected to the annular sleeve (40); the limiting groove (90) is provided on the first joint (11); one end of the annular sleeve (40) facing the second joint (12) is in contact with the inner wall of the second joint (12); the second joint (12) is connected to the one-way valve (20) and the rupture disk (30).

4. The non-tank slurry casing floating coupling according to claim 3 is characterized in that: The limiting groove (90) is formed by the cooperation of the first joint (11) and the second joint (12).

5. The non-tank slurry casing floating coupling according to claim 2 is characterized in that: The wedge-shaped groove (60) is arranged on the limiting boss (70).

6. The non-tank slurry casing floating coupling according to claim 2 is characterized in that: A first sealing ring (100) is provided on the contact surface between the limiting boss (70) and the coupling body (10).

7. A slurry-free casing floating coupling according to claim 1 or 2, characterized in that: The coupling body (10) is provided with a one-way valve connecting hole; the one-way valve (20) comprises a valve seat (21), a valve plate (22), a torsion spring (23) and a piston (24); the two ends of the one-way valve (20) connecting hole are respectively fixedly connected to the valve seat (21) and movably connected to the piston (24); the piston (24) is located at one end close to the inner cavity of the coupling body (10); the valve seat (21) and the piston (24) are both provided with flow holes; the torsion spring (23) is connected to the valve seat (21) between the valve seat (21) and the piston (24), and the torsion spring (23) is connected to the valve plate (22); In the initial state, the valve plate (22) covers the valve seat (21) so that the one-way valve (20) is closed.

8. The non-tank slurry casing floating coupling according to claim 7 is characterized in that: Second sealing rings (110) are arranged on the inner wall of the coupling body (10) on both sides of the one-way valve (20).

9. The non-tank slurry casing floating coupling according to claim 1 is characterized in that: A plurality of the one-way valves (20) are provided, and the plurality of one-way valves (20) are evenly and circumferentially arranged on the inner wall of the coupling body (10).

10. The non-slurry-tank casing floating coupling according to claim 1 is characterized in that: It also includes a third joint (120), and one end of the coupling body (10) close to the rupture disk (30) is connected to the third joint (120), and the coupling body (10) and the third joint (120) cooperate to form a rupture disk connection groove (130).

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