Well washing circulating valve capable of being opened and closed

Abstract

The utility model relates to the field of oil and gas field downhole tool technology and construction operation, in particular to a well washing circulating valve capable of being opened and closed. The well washing circulating valve capable of being opened and closed comprises an upper body (1) and a lower body (7). The upper body (1) and the lower body (7) are connected through threads, and the upper body (1) and the lower body (7) are connected through a screw (6). The upper body (1) and the lower body (7) form a cavity, and the cavity is used for mounting the spring (2) and the sealing valve (4); the sealing valve (4) is of an annular structure, and the annular structure is in contact with the spring (2); the upper body (1) comprises more than one upper body hole (8), and the lower body (7) is provided with more than one lower body hole (9).

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology and construction operations in oil and gas fields, and in particular to a switchable well-washing circulation valve. Background Technology

[0002] A well-washing circulation valve is a downhole operating device specifically designed for oil and gas extraction, as well as water wells. It plays a crucial role in these fields, and its specific applications are described below:

[0003] During oil well production, various impurities, including sand and oil sludge, often accumulate at the bottom of the well. The presence of these impurities severely impacts well production and efficiency. To remove these impurities and improve well performance, a well-washing circulation valve is used to perform reverse circulation well-washing operations. Through this valve, the well-washing fluid can be injected from the annulus into the well bottom, then return to the surface through the tubing, carrying away impurities and other substances from the well bottom, thereby cleaning the well bottom and clearing the oil flow path. For example, when an oil well experiences severe sand production or a decline in production, regular well-washing operations are necessary. In such cases, the well-washing circulation valve plays a crucial control role, ensuring that the well-washing fluid circulates along a predetermined path, thus significantly improving the effectiveness of the well-washing operation.

[0004] In water injection wells, well-washing circulation valves are used to periodically backflush the water injection system. The injected water may contain suspended solids, bacteria, and other impurities. If injected for a long period without cleaning, these impurities can cause formation blockage, thus affecting the water injection effect. Well-washing circulation valves also play a crucial role in oil and gas well fracturing operations during petroleum exploration and development. They connect to the fracturing tubing string and are subordinate to fracturing packers, tailpipes, and other products. During or after fracturing operations, sand blockage or sand burial often occurs due to formation and fracturing fluid factors. Once sand burial occurs, continuing operations and cleaning the buried tubing string become extremely difficult, often leading to major well workovers and disrupting the fracturing process. Therefore, well-washing circulation valves play a vital role in this process, ensuring the continuity and efficiency of fracturing operations.

[0005] On April 13, 2025, a search was conducted in the China Patent Publication Database using "switchable and well washing and circulation valve and spring" as the abstract keywords and with the option to allow synonym expansion. No relevant literature was found.

[0006] On April 13, 2025, using "switchable and well washing and circulation valve and spring" as the abstract keywords and selecting "allow synonym expansion", a search was conducted on CNKI (China National Knowledge Infrastructure), but no relevant literature was found.

[0007] On April 13, 2025, a search was conducted on the website of the United States Patent and Trademark Office with "Switchable with Well Flushing with Circulation Valve with Spring" as the search term, and no relevant documents were found; the search website is https: / / ppubs.uspto.gov / pubwebapp / .

[0008] On April 13, 2025, a search was conducted on WIPO's https: / / patentscope2.wipo.int / with "Switchable and Well Flushing and Circulation Valve and Spring" as the search term, and no relevant documents were found.

[0009] On April 13, 2025, a search was conducted on the website of the Japan Patent Office at https: / / www.j-platpat.inpit.go.jp / with "Switchable and Well Flushing and Circulation Valve and Spring" as the search term, and no relevant documents were found. Content of the Utility Model

[0010] The utility model discloses a kind of switchable well flushing circulation valves, and the specific purpose is seen multiple substantial technical effects of the embodiment part.

[0011] In order to achieve the above purpose, the utility model takes the following technical solutions:

[0012] A switchable well flushing circulation valve, characterized in that the switchable well flushing circulation valve comprises an upper body 1 and a lower body 7.

[0013] The upper body 1 and the lower body 7 are connected to each other by threads, and the upper body 1 and the lower body 7 are connected by a screw 6.

[0014] The upper body 1 and the lower body 7 form a cavity for installing a spring 2 and a sealing valve 4.

[0015] The sealing valve 4 is a ring structure that contacts the spring 2.

[0016] The upper body 1 comprises one or more upper body holes 8, and the lower body 7 is arranged with one or more lower body holes 9.

[0017] The further technical solution of the utility model is that the left end of the upper body 1 is connected to the working pipe column with standard oil pipe threads, and the upper body 1 is evenly distributed with four liquid inlet holes,

[0018] The further technical scheme of the utility model discloses, the inner and outer surface of sealing valve 4 is equipped with sealing groove, sealing groove is used to install O-shaped sealing ring one 3, O-shaped sealing ring two 5, sealing valve 4 realizes sliding sealing with upper body 1, lower body 7, is used to open or close well flushing passage.

[0019] The further technical scheme of the utility model discloses, spring 2 is spiral spring, and spring 2 is in compression state when installing, makes sealing valve 4 be in closed state.

[0020] The further technical scheme of the utility model discloses, the right end of lower body 7 is standard oil pipe thread and operation pipe column lower connection, and six liquid inlet holes are arranged on the circumference of lower body 7.

[0021] The further technical scheme of the utility model discloses, the lower body of sealing valve 4 is arranged with the inclined surface.

[0022] The utility model discloses the following beneficial effects relative to prior art by adopting the above technical scheme: through the backwashing of well flushing circulating valve, the inside and outside of pipe column buried by sand are cleaned, and the backwashing is realized, when the wellhead return liquid is clean, stop oil jacket annular pressure, circulating valve is closed, can continue to carry out operation, ensure that construction is smoothly completed.

[0023] Through the backwashing of well flushing circulating valve, the impurities in injection pipeline and formation can be flushed out, the permeability of formation is maintained, the water injection efficiency is improved, the normal operation of water injection well is ensured, the formation pressure is maintained, and the recovery rate of oil reservoir is improved. DRAWINGS

[0024] In order to further illustrate the present application, further description is made below in conjunction with the drawings:

[0025] Figure 1 It is the structural schematic diagram of the utility model;

[0026] Figure 2 It is the well flushing passage opening schematic diagram of the utility model;

[0027] Figure 3 It is the three-dimensional drawing cut of the utility model;

[0028] Figure 4 It is the three-dimensional drawing of the upper body of the utility model;

[0029] Figure 5 It is the three-dimensional drawing of the lower body of the utility model;

[0030] Wherein: 1, upper body, 2, spring, 3, O-shaped sealing ring one, 4, sealing valve, 5, O-shaped sealing ring two, 6, screw, 7, lower body, 8. upper body hole, 9. lower body hole. DETAILED DESCRIPTION

[0031] The utility model is further illustrated below in combination with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the utility model and not to limit the scope of the utility model. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] It should be noted that in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0033] The present patent provides a variety of parallel schemes, and different expressions belong to improved schemes or parallel schemes based on the basic scheme. Each scheme has its own unique characteristics. In addition, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as there is no conflict between them. The fixing mode not expressed in the text can be any one of the fixing modes such as screw fixing, bolt fixing or glue bonding.

[0034] Embodiment one: in combination with all the drawings; a switchable well washing circulating valve, characterized in that the switchable well washing circulating valve comprises an upper body 1 and a lower body 7;

[0035] The upper body 1 and the lower body 7 are connected to each other by threads, and the upper body 1 and the lower body 7 are connected by a screw 6;

[0036] The upper body 1 and the lower body 7 form a cavity, which is used to install a spring 2 and a sealing valve 4;

[0037] The sealing valve 4 is a ring structure which contacts the spring 2;

[0038] The upper body 1 comprises one or more upper body holes 8, and the lower body 7 is provided with one or more lower body holes 9. The essential technical effects and implementation process of the technical solution are as follows: in order to solve the problem of wellbore cleaning, the switchable well cleaning circulating valve is provided for downhole operation, which can ensure normal sealing in various construction processes and can open the well cleaning passage for well cleaning when needed. After the well cleaning is completed, the well cleaning passage is closed to restore the original position, and normal construction can continue.

[0039] The spring is a coil spring which is in a compressed state when installed, so that the sealing valve is in a closed state. When opening is needed, the sealing valve is further compressed and slides, the lower body well cleaning passage is opened, and backwashing is realized. After the well cleaning is completed, the well cleaning passage is closed to restore the original position under the action of the spring, and normal construction can continue.

[0040] In the second embodiment, as a further improved scheme or a parallel scheme or an alternative independent scheme, the left end of the upper body 1 is connected to the working string through standard tubing threads, and four liquid inlet holes are uniformly arranged on the circumference of the upper body 1. The essential technical effects and implementation process of the technical solution are as follows: the number of the holes is within the protection scope of the patent.

[0041] In the third embodiment, as a further improved scheme or a parallel scheme or an alternative independent scheme, the sealing valve 4 is provided with a sealing groove on the inner and outer surfaces, and O-shaped sealing ring one 3 and O-shaped sealing ring two 5 are arranged in the sealing groove. The sealing valve 4 realizes sliding sealing with the upper body 1 and the lower body 7, and is used to open or close the well cleaning passage. When downhole operation is performed, high pressure is provided in the tubing, and the sealing valve 4 is in a sealing state at this time. When well cleaning is needed, high-pressure liquid is injected from the annulus between the tubing and the casing, the sealing valve 4 is pushed through the side hole of the upper body 1, the spring 2 is further compressed, the well cleaning passage connected to the lower body 7 is opened, and backwashing is realized. After the well cleaning is completed, the well cleaning passage is closed to restore the original position under the action of the spring 2, and normal construction can continue.

[0042] In the fourth embodiment, as a further improved scheme or a parallel scheme or an alternative independent scheme, the spring 2 is a coil spring which is in a compressed state when installed, so that the sealing valve 4 is in a closed state. The essential technical effects and implementation process of the technical solution are as follows: a specific closed structure is provided.

[0043] Embodiment five: as a further improvable scheme or parallel scheme or alternative independent scheme, the right end of the lower body 7 is connected with the working string by standard tubing thread, and six liquid inlet holes are arranged on the upper circumference of the lower body 7. The essential technical effect and its implementation process of the technical scheme in the present application are as follows: the similar number is within the protection scope of the present patent.

[0044] A tilted surface is arranged below the sealing valve 4.

[0045] Pioneeringly, the above various effects exist independently, and the combination of the above results can also be achieved by using a set of structures.

[0046] It should be noted that the modules of the present patent are the integration of the modules of the prior art, and do not involve new modules. Even if part of the module uses a program, the program is undoubtedly a known program.

[0047] It should be noted that the multiple schemes provided by the present patent contain the basic scheme itself, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0048] The above shows and describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed subject matter.

Claims

1. A switchable well-washing circulation valve, characterized in that, The switchable well-washing circulation valve comprises an upper body (1) and a lower body (7). The upper body (1) and the lower body (7) are connected to each other by threads, and the upper body (1) and the lower body (7) are connected by screws (6); The upper body (1) and the lower body (7) form a cavity for installing the spring (2) and the sealing valve (4). The sealing valve (4) is a ring structure that contacts the spring (2). The upper body (1) contains one or more upper body holes (8), and the lower body (7) has one or more lower body holes (9).

2. The switchable well-washing circulation valve as described in claim 1, characterized in that, The left end of the upper body (1) is connected to the working pipe string by a standard oil pipe thread, and four liquid inlet holes are evenly distributed around the circumference of the upper body (1).

3. The switchable well-washing circulation valve as described in claim 1, characterized in that, The sealing valve (4) has sealing grooves on its inner and outer surfaces. The sealing grooves are used to install O-ring seal one (3) and O-ring seal two (5). The sealing valve (4) achieves sliding seal with the upper body (1) and the lower body (7) and is used to open or close the well washing channel.

4. The switchable well-washing circulation valve as described in claim 1, characterized in that, The spring (2) is a helical spring. When the spring (2) is installed, it is in a compressed state, so that the sealing valve (4) is in a closed state.

5. The switchable well-washing circulation valve as described in claim 1, characterized in that, The lower body (7) has a standard oil pipe thread on the right end that connects to the working pipe string. Six inlet holes are evenly distributed around the upper circumference of the lower body (7).

6. The switchable well-washing circulation valve as described in claim 1, characterized in that, An inclined surface is arranged below the sealing valve (4).

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