Float collar float shoe for well cementation of deep well

Abstract

The utility model relates to the technical field of float collars and float shoes, and discloses a float collar and float shoe for well cementation of a deep well, which comprises a pipe body, G-grade cement is fixedly connected in the pipe body, a valve body is fixedly connected at the bottom of the G-grade cement, a spring is arranged in the valve body, a ball seat is slidably connected in the valve body, a ball body is fixedly connected at the top of the ball seat, and the top of the ball seat is fixedly connected with the spring. A twisted rod is fixedly connected to the bottom of the ball seat, a cross seat is rotatably connected to the periphery of the twisted rod, and a plurality of brushes are fixedly connected to the top of the cross seat. By arranging the pipe body, the G-grade cement, the valve body, the spring, the ball seat, the ball body, the twisted rod, the cross seat, the brush and the like, silt attached to the periphery of the spring can be cleaned, and the situation that due to the fact that too much silt is deposited in cement paste in the valve body, the too much silt attached to the periphery of the spring hinders stretching and retracting of the spring is prevented; the using effect of the valve body becomes poor, and the cement paste conveying efficiency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of floating collars and floating shoes, in particular to floating collars and floating shoes for deep well cementing. Background Art

[0002] Float collars and float shoes are a type of casing guide shoe or coupling used in oil drilling that can generate buoyancy. They can play a variety of key roles in the drilling process. The main function of float collars and float shoes is to control the flow of cement slurry during cementing operations, help the casing enter the well smoothly, prevent it from flowing back, and ensure cementing quality.

[0003] The commonly used floating collar and floating shoe for deep well cementing is equipped with a pipe body, valve body, G-grade cement, ball rod, spring, ball valve, etc. The spring pushes the ball valve to block the valve port. When cement slurry is transported upward from the bottom, the cement slurry pushes the ball valve, the ball valve compresses the spring, and the spring pushes the ball rod. The ball rod prevents the spring from deflecting when compressed by the ball valve. After the ball valve is pushed by the cement slurry, the cement slurry flows from the valve port into the pipe body and is transported upward. When there is cement slurry inside the pipe body, the elastic force of the spring and the pressure of the cement slurry together push the ball valve to engage with the valve port to prevent the cement slurry from flowing back.

[0004] The commonly used floating collar and floating shoe for deep well cementing will cause the mud and sand in the cement slurry to accumulate inside the valve body during use, so that the mud and sand will adhere to the periphery of the spring inside the valve body and hinder the expansion and contraction of the spring, resulting in the deterioration of the valve body and the reduction of the efficiency of conveying cement slurry. Therefore, a floating collar and floating shoe for deep well cementing is proposed to solve the above problem. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a floating collar and floating shoe for deep well cementing, aiming to improve the problem in the prior art that cement slurry accumulates inside the valve body during use, causing the spring to be unable to expand and contract normally, making the valve body less effective and reducing the efficiency of conveying cement slurry.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A floating collar and a floating shoe for deep well cementing, comprising a pipe body, wherein the interior of the pipe body is fixedly connected to Grade G cement, the bottom of the Grade G cement is fixedly connected to a valve body, a spring is provided inside the valve body, a ball seat is slidably connected to the interior of the valve body, a ball is fixedly connected to the top of the ball seat, a twisted rod is fixedly connected to the bottom of the ball seat, the outer periphery of the twisted rod is rotatably connected to a cross seat, and a plurality of brushes are fixedly connected to the top of the cross seat;

[0008] As a further description of the above technical solution:

[0009] The sphere includes a wear-resistant layer, the outer side of the wear-resistant layer is fixedly connected to the top of the ball seat, the wear-resistant layer is provided with an anti-corrosion layer inside, the anti-corrosion layer is provided with a buffer layer inside, and the buffer layer is provided with a ball valve inside;

[0010] As a further description of the above technical solution:

[0011] One end of the spring is fixedly connected to the bottom inner wall of the valve body;

[0012] As a further description of the above technical solution:

[0013] The other end of the spring is fixedly connected to the bottom of the ball seat;

[0014] As a further description of the above technical solution:

[0015] The outer side of the ball is slidably connected to the inside of the valve body;

[0016] As a further description of the above technical solution:

[0017] The outer side of the brush is slidably connected to the outer side of the spring;

[0018] As a further description of the above technical solution:

[0019] The bottom of the cross seat is rotatably connected to the bottom inner wall of the valve body;

[0020] As a further description of the above technical solution:

[0021] The outer periphery of the spring is slidably connected to the inner wall of the valve body.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the utility model, when conveying cement slurry, the cement slurry pushes the ball, the ball pushes the ball seat, the ball seat compresses the spring, the spring ball seat pushes the twisted rod, the twisted rod drives the cross seat to rotate, the rotation of the cross seat drives the brush to rotate, and the brush cleans the spring. When the conveying stops, the spring pushes the ball seat, the ball seat pushes the ball, the ball engages with the valve port, the ball seat drives the twisted rod at the same time, the twisted rod drives the cross seat, the cross seat drives the brush, and the brush cleans the spring again, so that the mud and sand attached to the outer periphery of the spring can be cleaned off, preventing excessive mud and sand from accumulating in the cement slurry inside the valve body, so that excessive mud and sand attached to the outer periphery of the spring hinders the expansion and contraction of the spring, the use effect of the valve body is deteriorated, and the efficiency of conveying cement slurry is reduced.

[0024] 2. In the present invention, the wear-resistant layer is made of Cr3C2-Ni Cr / Mo composite coating, which has excellent wear resistance and is suitable for high temperature, high pressure, and solid particle medium applications. The anti-corrosion layer is made of ceramic material, which also has good corrosion resistance and can resist the erosion of various corrosive fluids, thereby extending the service life of the valve. The buffer layer is made of rubber, a polymer compound with high elasticity, which can buffer and absorb vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional schematic diagram of the floating collar and floating shoe for deep well cementing proposed by the utility model;

[0026] Figure 2 This is a cross-sectional view of the sphere of the floating collar and floating shoe for deep well cementing proposed by the utility model;

[0027] Figure 3 The utility model is a structural schematic diagram of the ball seat of the floating collar and floating shoe for deep well cementing.

[0028] Legend:

[0029] 1. Pipe body; 2. G-grade cement; 3. Valve body; 4. Spring; 5. Ball seat; 6. Ball; 7. Twisted rod; 8. Cross seat; 9. Brush; 10. Ball valve; 11. Anti-corrosion layer; 12. Wear-resistant layer; 13. Buffer layer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0031] Reference Figure 1-Figure 3The present invention provides an embodiment of a float collar and shoe for deep well cementing, comprising a pipe body 1, which serves as the main body of the float collar and shoe. G-grade cement 2 is fixedly connected to the interior of the pipe body 1 and positioned within the pipe body 1 to support and secure other components. A valve body 3 is fixedly connected to the bottom of the G-grade cement 2, which is located within the pipe body 1 and serves to support and secure other components. A spring 4 is disposed within the valve body 3, one end of which is fixed to the bottom inner wall of the valve body 3 and the other end of which is fixed to the bottom of a ball seat 5, used to propel the ball seat 5. The valve body 3 is slidably connected to the ball seat 5. A ball 6 is fixedly connected to the top of the ball seat 5. A twisted rod 7 is fixedly connected to the bottom of the ball seat 5. A cross seat 8 is rotatably connected to the outer periphery of the twisted rod 7. When the ball 6 pushes the ball seat 5, the ball seat 5 drives the twisted rod 7, which in turn rotates the cross seat 8. Multiple brushes 9 are fixedly connected to the top of the cross seat 8, which in turn rotate the brushes 9. One end of the spring 4 is fixedly connected to the bottom inner wall of the valve body 3. The other end of the spring 4 is fixedly connected to the bottom of the ball seat 5. To maintain the stability of spring 4 and prevent it from deflecting, the outer side of ball 6 is slidably connected to the interior of valve body 3, allowing it to slide up and down. The outer side of brush 9 is slidably connected to the outer side of spring 4 to clean mud and sand outside of spring 4. The bottom of cross seat 8 is rotatably connected to the bottom inner wall of valve body 3 to prevent cross seat 8 from falling off. The outer periphery of spring 4 is slidably connected to the inner wall of valve body 3, allowing spring 4 to stably expand and contract.

[0032] Reference Figure 2 and Figure 3 The sphere 6 includes a wear-resistant layer 12. The outer side of the wear-resistant layer 12 is fixedly connected to the top of the ball seat 5. The material of the wear-resistant layer 12 is Cr3C2-Ni Cr / Mo composite coating with excellent wear resistance. It is suitable for high temperature, high pressure, and solid particle medium occasions. It is used to protect the sphere 6 from wear and impact. An anti-corrosion layer 11 is provided inside the wear-resistant layer 12. The material of the anti-corrosion layer 11 is ceramic material and has good corrosion resistance. It can resist the erosion of various corrosive fluids, extend the service life of the valve, prevent the internal material of the sphere 6 from being corroded, and extend the service life of the sphere 6. A buffer layer 13 is provided inside the anti-corrosion layer 11. The material of the buffer layer 13 is rubber, which is a polymer compound with high elasticity. It can buffer, absorb vibration and absorb impact force, reduce vibration and damage of the sphere 6 when it is impacted, and a ball valve 10 is provided inside the buffer layer 13 to control the flow of fluid.

[0033] Working principle: When conveying cement slurry, the cement slurry enters from the end close to the G grade cement 2, first impacting the ball 6, which is pushed by the impact force of the cement slurry, and the ball 6 pushes the ball seat 5, which compresses the spring 4. When the ball 6 is pushed, the valve port is opened, allowing the cement slurry to enter the valve body 3, and the cement slurry is guided into the pipe body 1 through the openings on both sides of the valve body 3 and conveyed upward. When the ball seat 5 is pushed, it drives the twisted rod 7, and when the twisted rod 7 moves, it drives the cross seat 8 to rotate forward, and the cross seat 8 drives The brush 9 rotates to clean the spring 4 and clean the mud and sand attached to the outer periphery of the spring 4. When the transportation stops, the cement slurry accumulates in the pipe body 1 and the valve body 3. The elastic force generated when the spring 4 is compressed and the pressure of the cement slurry push the ball seat 5, and the ball seat 5 pushes the ball 6. The ball 6 engages with the valve port to prevent the cement slurry from flowing back. When the ball seat 5 drives the ball 6, it also drives the twisted rod 7. The twisted rod 7 drives the cross seat 8 to rotate, and the cross seat 8 drives the brush 9 to rotate to clean the spring 4 again.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A floating collar and a floating shoe for deep well cementing, comprising a pipe body (1), characterized in that: The tube body (1) is fixedly connected to the interior of the tube body (1), the bottom of the G-grade cement (2) is fixedly connected to the valve body (3), a spring (4) is provided inside the valve body (3), a ball seat (5) is slidably connected inside the valve body (3), a ball (6) is fixedly connected to the top of the ball seat (5), a twisted rod (7) is fixedly connected to the bottom of the ball seat (5), the outer periphery of the twisted rod (7) is rotatably connected to a cross seat (8), and a plurality of brushes (9) are fixedly connected to the top of the cross seat (8).

2. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: The sphere (6) includes a wear-resistant layer (12), the outer side of the wear-resistant layer (12) is fixedly connected to the top of the ball seat (5), an anti-corrosion layer (11) is provided inside the wear-resistant layer (12), a buffer layer (13) is provided inside the anti-corrosion layer (11), and a ball valve (10) is provided inside the buffer layer (13).

3. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: One end of the spring (4) is fixedly connected to the bottom inner wall of the valve body (3).

4. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: The other end of the spring (4) is fixedly connected to the bottom of the ball seat (5).

5. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: The outer side of the sphere (6) is slidably connected to the inside of the valve body (3).

6. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: The outer side of the brush (9) is slidably connected to the outer side of the spring (4).

7. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: The bottom of the cross seat (8) is rotatably connected to the bottom inner wall of the valve body (3).

8. The floating collar and floating shoe for deep well cementing according to claim 1, characterized in that: The outer periphery of the spring (4) is slidably connected to the inner wall of the valve body (3).

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