Bypass valve nipple for well cementation and using method thereof

Abstract

The invention provides a bypass valve short section for well cementation and a using method thereof.The bypass valve short section comprises a first body, a spring, a sliding sleeve and a base, the spring, the sliding sleeve and the base are sequentially arranged in an inner cavity of the first body from top to bottom, the upper end and the lower end of the first body are in threaded connection with a sleeve respectively, and bypass holes are formed in the circumferential direction of the first body; the spring is located on the upper portion of an inner cavity of the first body. The sliding sleeve is installed on the lower portion of the inner cavity of the first body and can slide up and down in the inner cavity of the first body. The method is realized through the bypass valve short section for well cementation. According to the bypass valve short section for well cementation, a circulation channel can be rapidly established during the period of replacing drilling fluid in a casing pipe, the drilling fluid returns out of a pipeline through the anti-overflow pipe to enter a circulation tank, pollution of the drilling fluid to a drill floor face is reduced, and the casing pipe tapping efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of petroleum engineering, specifically to a bypass valve short section for cementing and its usage method. Background Technology

[0002] During cementing operations, the large wellbore size in the upper formation leads to a large casing size. To save cement usage and improve annular cement displacement efficiency, casing-insertion cementing is typically used. After cementing, clean water or high-quality drilling fluid is needed to displace the drilling fluid and cement-contaminated drilling fluid inside the casing, allowing logging tools to be smoothly run to the bottom of the well to assess cementing quality. To establish a displacement circulation channel, the overflow preventer is usually removed on-site, a hole is drilled in the casing, and then the overflow preventer is reinstalled. However, this operation is time-consuming (at least 2 hours) and poses safety risks. Therefore, a bypass valve short section for rapid circulation establishment during casing-insertion cementing is proposed.

[0003] Chinese utility model patent application number CN202122813416.3, entitled "A Simple Cementing Bypass Valve," discloses a simple cementing bypass valve, including a body with threads at its upper and lower ends for connection to an oil casing. An opening seat is fitted inside the body's cavity, and an opening plug inserted from the wellhead sits on the lower end of the opening seat's inner cavity. A rubber ring seals the opening seat and the body. This utility model is applicable to cementing operations in water source wells, effectively ensuring cementing quality and reducing the impact of formation fluids on the underground and surface environments during subsequent operations. However, this application differs in structure from this design.

[0004] Chinese utility model patent application number "CN201220006142.5" entitled "Unbalanced Drilling Casing Bypass Valve" discloses an underbalanced drilling casing bypass valve. This valve shears the pin by increasing the pressure inside the casing, connecting the inner and outer casing circulation holes to achieve the circulation and control requirements of an underbalanced well. However, this utility model's casing bypass valve is connected to the last casing pipe. After cementing operations, drill pipe needs to be run to replace the drilling fluid in the casing, but shearing the pin by increasing the casing pressure is not feasible. Therefore, providing a cementing bypass valve section that can quickly open the bypass hole, is easy to operate, reusable, and has low operational risk, along with its usage method, is of great significance. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to solve one or more problems existing in the prior art. For example, one objective of this invention is to solve the problems of low bypass valve opening efficiency and high operational risks in current pipe cementing processes.

[0006] To achieve the above objectives, the present invention provides a bypass valve sub for cementing. The bypass valve sub may include a first body, and a spring, a sliding sleeve, and a base arranged sequentially from top to bottom within the inner cavity of the first body. The upper and lower ends of the body are threadedly connected to the casing, and a bypass hole is provided circumferentially. The spring is located in the upper part of the inner cavity of the first body, and the bypass hole is located below the spring. The sliding sleeve is installed in the lower part of the inner cavity of the first body and can slide up and down within the inner cavity of the first body.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, sealing rings may be provided at the upper and lower ends of the sliding sleeve to seal the sliding sleeve with the inner cavity of the first body.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the bypass valve section may further include a plurality of limiting pins, which are installed in limiting holes located below the bypass hole, enabling the spring to remain in a compressed state.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, the plurality of limiting pins may be evenly distributed on both sides of the first body.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the base may be fixedly mounted on the first body and is capable of withstanding impacts from the sliding sleeve.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the bypass valve subsection may further include a diversion mechanism through which drilling fluid enters the bypass orifice when drilling fluid is replaced.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the diversion mechanism may include a second body and a plurality of diversion holes arranged circumferentially, wherein the inner diameter of the second body is the same as the inner diameter of the first body.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, when replacing drilling fluid, the drilling fluid enters the bypass hole through the diversion hole.

[0014] Another aspect of the present invention provides a method for using a cementing bypass valve short section, which can be implemented using the cementing bypass valve short section as described above.

[0015] According to one or more exemplary embodiments of another aspect of the present invention, the method may include: connecting the bypass valve section to the casing; the sliding sleeve compressing the spring to close the bypass hole, and using the limiting pin to keep the spring in a compressed state; pulling out the limiting pin, the sliding sleeve impacting the base, thereby quickly opening the bypass hole, and drilling fluid entering the bypass hole through the diversion mechanism for drilling fluid replacement.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The bypass valve section for cementing provided by the present invention can quickly establish a circulation channel during the replacement of drilling fluid in the casing, so that the drilling fluid can return to the circulation tank through the anti-overflow pipe, reduce the pollution of drilling fluid to the drilling platform, and improve the casing opening efficiency.

[0018] (2) The bypass valve short section for cementing provided by the present invention is not only suitable for pipe cementing, but also for double rubber plug cementing. It maintains the sealing performance of the casing before the slurry circulation, and does not need to remove the anti-overflow pipe during the slurry circulation. It can quickly open the casing bypass hole and establish a slurry circulation channel.

[0019] (3) The bypass valve section for cementing provided by the present invention does not require disassembly and installation of the anti-overflow pipe, and can be reused, reducing the safety risks of construction operations. Attached Figure Description

[0020] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 This diagram shows a cross-sectional view of a cementing bypass valve in a closed state according to an exemplary embodiment of the present invention.

[0022] Figure 2 This diagram shows a cross-sectional view of a cementing bypass valve in an open state according to an exemplary embodiment of the present invention.

[0023] Figure 3 A front view of a diversion mechanism in an exemplary embodiment of the present invention is shown.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-First body, 2-Spring, 3-Sliding sleeve, 4-Base, 51-Female thread, 52-Male thread, 6-Bypass hole, 7-Sealing ring, 8-Limiting pin, 9-Diverting mechanism, 91-Second body, 92-Diverting hole. Detailed Implementation

[0026] In the following, a bypass valve section for cementing and its method of use according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0027] In the description of this application, it should be understood that the terms "upper," "lower," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Exemplary Example 1

[0030] This exemplary embodiment provides a bypass valve section for cementing.

[0031] like Figures 1 to 3 As shown, the bypass valve section may include a first body 1, and a spring 2, a sliding sleeve 3, and a base 4 arranged sequentially from top to bottom in the inner cavity of the first body 1.

[0032] The first body 1 has its upper and lower ends threadedly connected to the sleeve, and a bypass hole 6 is provided circumferentially. The spring 2 is located in the upper part of the inner cavity of the first body 1, and the bypass hole 6 is located below the spring 2. The sliding sleeve 3 is installed in the lower part of the inner cavity of the first body 1 and can slide up and down in the inner cavity of the first body 1. Here, the upper end of the first body 1 is connected to the sleeve through a female thread 51, and the lower end of the first body 1 is connected to the sleeve through a male thread 52.

[0033] In this exemplary embodiment, sealing rings 7 can be provided at the upper and lower ends of the sliding sleeve 3 to seal the inner cavity of the first body 1, preventing drilling fluid from flowing out through the gap between the sliding sleeve 3 and the first body 1, so that the bypass valve section meets the requirements for circulating drilling fluid.

[0034] In this exemplary embodiment, the bypass valve section may further include multiple limiting pins 8. The limiting pins 8 can be installed in a limiting hole located below the bypass hole 6. When the sliding sleeve 3 moves upward to compress the spring 2 above the limiting hole, inserting the limiting pin 8 keeps the spring compressed. The limiting hole may form a 60° angle with the horizontal direction, facilitating quick removal of the limiting pin 8. Multiple limiting pins 8 are evenly distributed on both sides of the first body 1. Further, the number of limiting pins 8 may be two, symmetrically distributed on both sides of the first body 1.

[0035] In this exemplary embodiment, the base 4 is fixedly mounted on the first body 1 and can withstand impacts from the sliding sleeve 3. Furthermore, the base 4 is made of an impact-resistant material and is fixedly mounted on the first body 1 in a ring shape, and can withstand multiple impacts from the sliding sleeve 3.

[0036] In this exemplary embodiment, the bypass valve subsection may further include a diversion mechanism 9, through which the drilling fluid enters the bypass port 6 when the drilling fluid is replaced. The diversion mechanism 9 may include a second body 91 and a plurality of circumferentially arranged diversion holes 92. The inner diameter of the second body 91 is the same as the inner diameter of the first body 1, which can meet the requirements of double rubber plug construction. Further, when the drilling fluid is replaced, the drilling fluid enters the bypass port 6 through the diversion holes 92.

[0037] Exemplary Example 2

[0038] This exemplary embodiment provides a method for using a cementing bypass valve sub, which can be implemented using a cementing bypass valve sub as described in Exemplary Embodiment 1.

[0039] In this exemplary embodiment, the method may include: connecting the bypass valve section to the casing; the sliding sleeve 3 compresses the spring 2 to close the bypass hole 6, and the spring 2 is kept in a compressed state by the limit pin 8; the limit pin 8 is pulled out, the sliding sleeve 3 impacts the base 4, and then quickly opens the bypass hole 6, and the drilling fluid enters the bypass hole 6 through the diversion mechanism 9 to replace the drilling fluid.

[0040] Furthermore, the method may include:

[0041] Before cementing, connect the casing bypass valve section to the last casing section to ensure the casing is driven to the target well depth. Then, use drill pipe to insert the casing into the socket and begin cementing. After cementing, pull up the drill pipe to remove the casing, then pull out the limit pin 8, open the bypass hole 6, and use high-quality mud or drilling fluid to replace the drilling fluid and cement-contaminated drilling fluid in the casing.

[0042] During the casing cementing operation, the casing is inserted into the socket using drill pipe, and the casing bypass valve is closed. The casing bypass valve closes the bypass hole 6 by compressing the spring 2 through the upward movement of the sliding sleeve 3, and the spring 2 is kept compressed by the limit pin 8. When the casing cementing operation is completed and it is necessary to replace the drilling fluid and drilling fluid contaminated with cement slurry in the casing, the limit pin 8 is pulled out using a metal zipper. The sliding sleeve 3 impacts the base 4 under the potential energy of the spring 2, thereby quickly opening the bypass hole 6, and replacing the drilling fluid in the casing with high-quality mud or clean water. The diversion mechanism 9 consists of a second body 91 and multiple diversion holes 92. The diversion mechanism 9 can be a cylindrical diversion hole. During the replacement of drilling fluid, the drilling fluid can enter the bypass hole 6 through the diversion holes 92, and then return to the mud tank through the anti-overflow pipe return line.

[0043] When the casing is not lowered to the target well depth, the bottom sand needs to be cleaned by circulating drilling fluid. The sealing performance of the bypass valve sub is achieved by the sliding sleeve 3 and the sealing ring 7. The sealing ring 7 is used at both the upper and lower ends of the sliding sleeve 3 to prevent the drilling fluid from flowing out through the gap between the sliding sleeve 3 and the first body 1, so that the bypass valve sub meets the requirements of circulating drilling fluid.

[0044] When cementing with tubing does not meet construction requirements and double-rubber plug cementing is necessary, the bypass hole 6 is sealed using the sliding sleeve 3 and sealing ring 7, ensuring that the bypass valve section meets the requirements for circulating drilling fluid. The inner diameter of the second body 91 is the same as that of the first body 1, allowing the double-rubber plug to be smoothly inserted into the casing. After the double-rubber plug cementing operation is completed, the drill pipe is lowered to the pressure seat, the limit pin 8 is pulled out, and the bypass hole 6 is quickly opened. High-quality mud or clean water is used to replace the drilling fluid in the casing and the drilling fluid contaminated with cement slurry.

[0045] In summary, the bypass valve sub for cementing of the present invention can quickly establish circulation in pipe cementing, and is suitable not only for pipe cementing but also for double-plug cementing. It maintains the casing's sealing performance before slurry replacement circulation, and does not require removal of the overflow preventer during slurry replacement. It quickly opens the bypass port to establish a slurry replacement circulation channel. Furthermore, the bypass valve sub is reusable, reducing safety risks during construction operations.

[0046] Although a bypass valve section for cementing and its usage method have been described above in conjunction with exemplary embodiments, those skilled in the art should understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A bypass valve pup joint for cementing, characterized in that, The bypass valve nipple comprises a first body, a spring, a sliding sleeve and a base arranged in the inner cavity of the first body from top to bottom, wherein, The upper end and the lower end of the first body are threadedly connected with the casing, and the bypass hole is circumferentially arranged; The spring is located in the upper part of the inner cavity of the first body, and the bypass hole is located below the spring; The sliding sleeve is installed in the lower part of the inner cavity of the first body and can slide up and down in the inner cavity of the first body.

2. The bypass valve pup joint for well cementation according to claim 1, characterized in that, Sealing rings are arranged at the upper and lower ends of the sliding sleeve respectively to seal the sliding sleeve and the inner cavity of the first body.

3. The bypass valve pup joint for well cementation according to claim 1, characterized in that, The bypass valve nipple further comprises a plurality of limiting pins, which are installed in limiting holes below the bypass hole and can keep the spring in a compressed state.

4. The bypass valve pup joint for well cementation according to claim 3, characterized in that, The plurality of limiting pins are uniformly distributed on both sides of the first body.

5. The bypass valve pup joint for well cementation according to claim 1, characterized in that, The base is fixedly arranged on the first body and can bear the impact from the sliding sleeve.

6. The bypass valve pup joint for well cementation according to claim 1, characterized in that, The bypass valve nipple further comprises a shunt mechanism, and when the drilling fluid is replaced, the drilling fluid enters the bypass hole through the shunt mechanism.

7. The bypass valve pup joint for well cementation according to claim 6, characterized in that, The shunt mechanism comprises a second body and a plurality of shunt holes arranged circumferentially, and the inner diameter of the second body is the same as that of the first body.

8. The bypass valve pup joint for well cementation according to claim 7, characterized in that, When the drilling fluid is replaced, the drilling fluid enters the bypass hole through the shunt holes.

9. A method of using a bypass valve pup joint for cementing, characterized in that, The method is realized by the bypass valve nipple for well cementation according to any one of claims 1-8.

10. The method of using a bypass valve pup joint for cementing a well as defined in claim 9, wherein, The method comprises: connecting the bypass valve nipple with the casing; the sliding sleeve compresses the spring to close the bypass hole, and the limiting pins keep the spring in a compressed state; pulling out the limiting pins, the sliding sleeve impacts the base, thereby quickly opening the bypass hole, the drilling fluid enters the bypass hole through the shunt mechanism, and the replacement of the drilling fluid is performed.

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