Check valve assembly for downhole tool

Abstract

The check valve assembly for the downhole tool comprises a fixed flange and an outflow pipe, an inner pipe used for being connected with an external flow guide connecting pipe in a sealed and embedded mode is arranged on the inner side of the fixed flange, and a water guide groove communicated with the external flow guide connecting pipe is formed in the inner pipe. The right side of the fixed flange is provided with a front compensation section used for compensating pressure fluid, and the right side of the front compensation section is provided with a pipe sleeve used for protecting the outer side. The front compensation section and the rear compensation section are used for achieving the pressure vibration compensation effect on pressure fluid, the inner damping rod is used for limiting the resilience force of the spring, excessive impact of the pressed head on the sealing caulking groove is reduced, the spring is used for reversely supporting the pressed head, and the flow guide pipe is sealed and cut off after fluid pressure is finished.

Description

Technical Field

[0001] The utility model belongs to the technical field of check valves and relates to a check valve assembly for downhole tools. Background Art

[0002] A one-way valve, also known as a check valve or non-return valve, is a valve that allows fluid to flow in one direction. Its main function is to prevent the backflow of fluid, thereby protecting equipment and systems from damage. The one-way valve is usually installed at the end of the fluid pipeline. When the fluid flows, the valve flap will open to allow the fluid to pass. However, when the fluid stops flowing or flows back, the flap will close to prevent the fluid from flowing back. A one-way valve, also known as a check valve or non-return valve, is a valve that allows fluid to flow in one direction. In underground work, one-way valves are widely used. Their main function is to prevent the backflow of fluid and ensure the safety and efficiency of underground operations. However, if the one-way valve cannot compensate and release the pressure fluid during use, a series of problems may arise.

[0003] In underground operations, fluid pressure often changes due to various factors such as geological conditions, drilling technology and fluid characteristics. If the check valve cannot effectively compensate and release pressure, these pressure fluctuations may be amplified, posing a threat to equipment and personnel underground.

[0004] In drilling, oil production and other operations, the stable flow of fluid is very important. If the check valve cannot effectively control the fluid pressure, the flow of the fluid may become unstable, resulting in reduced operating efficiency.

[0005] For example, if the fluid pressure is too high and the check valve cannot be effectively released, it may cause safety accidents such as pipeline rupture and equipment damage. This will not only have a serious impact on downhole operations, but may also threaten the lives of personnel. Therefore, there is an urgent need for a check valve assembly for downhole tools to solve the above problems. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model aims to provide a check valve assembly for downhole tools to solve the problems raised in the above-mentioned background technology.

[0007] The utility model is realized by the following technical solutions: a check valve assembly for downhole tools, comprising: a fixed flange and an outlet pipe, wherein the inner side of the fixed flange is provided with an inner pipe for sealing and engaging with an external flow guide pipe;

[0008] The inner tube is provided with a water guide groove for communicating with the external guide pipe, the right side of the fixed flange is provided with a front compensation section for compensating the pressure fluid, and the right side of the front compensation section is provided with a pipe sleeve for external protection;

[0009] A valve body for controlling the fluid rate is provided on the right side of the pipe sleeve, a connecting flange is provided between the valve body and the pipe sleeve, a valve handle for controlling the fluid rate is provided on the upper end of the valve body, and a connecting pipe for conducting fluid is provided on the right side of the valve body. The flow rate of the fluid can be controlled by using the valve body.

[0010] A rear compensation section for compensating the pressure fluid is provided on the right side of the connecting pipe, and an outlet pipe for diverting the flow is provided on the right side of the rear compensation section. The pressure vibration compensation effect of the pressure fluid can be performed by using the front compensation section and the rear compensation section.

[0011] As a preferred embodiment, a rear compensation section for compensating the pressure fluid is provided on the right side of the connecting pipe, and an outlet pipe for diverting the flow is provided on the right side of the rear compensation section.

[0012] As a preferred embodiment, the inner tube is interconnected with the interior of the front compensation section, the front compensation section and the rear compensation section have the same specifications and are both made of a metal bellows material, and the front compensation section is interconnected with the interior of the water guide groove.

[0013] As a preferred embodiment, a flow guide pipe is provided inside the pipe sleeve, and the pipe sleeve also includes a pressure head and an internal damping rod, and the cross section of the pressure head is a circular structure.

[0014] As a preferred embodiment, a sealing groove is provided on the right side of the guide tube, and the sealing groove is sealingly engaged with the pressure head. An internal damping rod for limiting the spring rebound force is provided in the middle position on the right side of the pressure head. The spring rebound force can be limited by using the internal damping rod, and the excessive impact of the pressure head on the sealing groove can be reduced.

[0015] As a preferred embodiment, a spring for providing a reverse force to the pressure head is provided on the outside of the inner damping rod, a limit ring for limiting the contraction position of the spring is provided on the outside of the middle position of the spring, and a fixing seat for supporting the spring and the inner damping rod is provided on the right side of the spring and the inner damping rod. The spring can be used to provide reverse support to the pressure head and seal the flow guide tube to cut off the flow after the fluid pressure ends.

[0016] As a preferred embodiment, a hollow support member for supporting the fixed seat is provided on the outer side of the fixed seat, and the interior of the hollow support member is interconnected with the interior of the valve body, and the valve body is a T40H-100C type rotary regulating valve.

[0017] After adopting the above technical scheme, the beneficial effects of the utility model are: by using the valve body to control the flow rate of the fluid, by using the front compensation section and the rear compensation section to compensate for the pressure vibration of the pressure fluid, by using the internal damping rod to limit the spring rebound force and reduce the excessive impact of the pressure head on the sealing groove, by using the spring to reversely support the pressure head, and after the fluid pressure ends, the guide tube is sealed and the flow is cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 This is a schematic diagram of the left side top view of a check valve assembly for downhole tools of the utility model;

[0020] Figure 2 It is a right side top view structural schematic diagram of a check valve assembly for downhole tools of the utility model;

[0021] Figure 3 This is a rear top view of a pipe sleeve in a check valve assembly for a downhole tool according to the utility model;

[0022] Figure 4 This is a front view structural diagram of the interior of a pipe sleeve in a check valve assembly for a downhole tool of the utility model;

[0023] In the figure: 100-fixed flange, 110-inner pipe, 120-water guide groove, 130-front compensation section, 140-pipe sleeve, 150-connecting flange, 160-valve body, 170-valve handle, 180-connecting pipe, 190-rear compensation section, 200-outlet pipe;

[0024] 14a-pressure head, 14b-spring, 14c-limiting ring, 14d-fixed seat, 14f-inner damping rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-Figure 4A check valve assembly for downhole tools includes: a fixed flange 100, a front compensation section 130, a pipe sleeve 140 and an outlet pipe 200. An inner pipe 110 for sealing and fitting with an external flow guide pipe is provided inside the fixed flange 100;

[0027] The inner tube 110 is provided with a water guide groove 120 for communicating with the external guide pipe. The right side of the fixed flange 100 is provided with a front compensation section 130 for compensating the pressure fluid. The right side of the front compensation section 130 is provided with a pipe sleeve 140 for external protection.

[0028] A valve body 160 for controlling the fluid rate is provided on the right side of the pipe sleeve 140, a connecting flange 150 is provided between the valve body 160 and the pipe sleeve 140, a valve handle 170 for controlling the fluid rate is provided on the upper end of the valve body 160, and a connecting pipe 180 for conducting fluid is provided on the right side of the valve body 160. The flow rate of the fluid can be controlled by using the valve body 160.

[0029] A rear compensation section 190 for compensating the pressure fluid is provided on the right side of the connecting pipe 180 , and an outlet pipe 200 for diverting the flow is provided on the right side of the rear compensation section 190 . The pressure vibration compensation effect of the pressure fluid can be performed by using the front compensation section 130 and the rear compensation section 190 .

[0030] A rear compensation section 190 for compensating the pressure fluid is provided on the right side of the connecting pipe 180 , and an outlet pipe 200 for guiding the flow is provided on the right side of the rear compensation section 190 .

[0031] The inner tube 110 is interconnected with the interior of the front compensation section 130 . The front compensation section 130 and the rear compensation section 190 have the same specifications and are both made of a metal bellows material. The front compensation section 130 is interconnected with the interior of the water guide groove 120 .

[0032] A flow guide pipe is arranged inside the pipe sleeve 140 , and the pipe sleeve 140 also includes a pressure head 14a , a spring 14b , a limit ring 14c , a fixing seat 14d and an inner damping rod 14e . The cross section of the pressure head 14a is a circular structure.

[0033] A spring 14b for providing a reverse force to the pressure head 14a is provided on the outside of the inner damping rod 14e, a limit ring 14c for limiting the contraction position of the spring 14b is provided on the outside of the middle position of the spring 14b, and a fixing seat 14d for supporting the spring 14b and the inner damping rod 14e is provided on the right side of the spring 14b and the inner damping rod 14e. The spring 14b can be used to provide reverse support to the pressure head 14a, and the guide tube can be sealed and cut off when the fluid pressure ends.

[0034] A hollow support member for supporting the fixed seat 14d is disposed outside the fixed seat 14d, and the interior of the hollow support member is communicated with the interior of the valve body 160. The valve body 160 is a T40H-100C type rotary regulating valve.

[0035] See also Figure 1-Figure 4 As the first embodiment of the utility model: In order to solve the problem that the fluid pressure often changes during underground operations due to various factors such as geological conditions, drilling technology and fluid characteristics, if the check valve cannot effectively perform pressure compensation and slow release, then these pressure fluctuations may be amplified, posing a threat to underground equipment and personnel, first, the staff seals the external diversion pipe with the inner pipe 110, and guides the external pressure fluid into the water guide groove 120, and then enters the inside of the diversion pipe from the water guide groove 120. After the pressure fluid exerts pressure to push the pressure head 14a open, the pressure fluid enters the inside of the pipe sleeve 140. A hollow support piece for supporting the fixed seat 14d is provided on the outside of the fixed seat 14d, and the interior of the hollow support piece is interconnected with the interior of the valve body 160, and the pressure fluid enters the interior of the valve body 160 through the hollow support piece. When the pressure of the pressure fluid is less than the reverse force of the spring 14b, the spring 14b pushes the pressure head 14a into the sealing groove on the right side of the guide pipe and intercepts the pressure fluid to prevent the pressure fluid inside the pipe sleeve 140 from flowing back. In this process, the front compensation section 130 and the rear compensation section 190 can compensate and release the pressure vibration generated by the pressure fluid to ensure that the utility model can be used stably.

[0036] See also Figure 1-Figure 4 , as the second embodiment of the utility model: based on the description in the above embodiment, further, since a sealing groove is provided on the right side of the guide tube, the sealing groove is sealed and embedded with the pressure head 14a, an internal damping rod 14e for limiting the rebound force of the spring 14b is provided in the middle position on the right side of the pressure head 14a. The internal damping rod 14e can be used to limit the rebound force of the spring 14b, and the excessive impact of the pressure head 14a on the sealing groove can be reduced, thereby reducing the sealing effect on the right side of the guide tube.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A check valve assembly for a downhole tool, comprising: A fixed flange (100), a front compensation section (130), a pipe sleeve (140) and an outlet pipe (200), characterized in that an inner pipe (110) for sealingly engaging with an external flow guide pipe is provided on the inner side of the fixed flange (100); The inner tube (110) is provided with a water guide groove (120) for communicating with an external guide tube, the right side of the fixed flange (100) is provided with a front compensation section (130) for compensating the pressure fluid, and the right side of the front compensation section (130) is provided with a pipe sleeve (140) for external protection; A valve body (160) for controlling the fluid rate is provided on the right side of the pipe sleeve (140), a connecting flange (150) is provided between the valve body (160) and the pipe sleeve (140), a valve handle (170) for controlling the fluid rate is provided at the upper end of the valve body (160), and a connecting pipe (180) for conducting fluid is provided on the right side of the valve body (160).

2. A check valve assembly for a downhole tool according to claim 1, characterized in that: A rear compensation section (190) for compensating the pressure fluid is provided on the right side of the connecting pipe (180), and an outlet pipe (200) for guiding the fluid is provided on the right side of the rear compensation section (190).

3. The check valve assembly for a downhole tool according to claim 1, characterized in that: The inner tube (110) is interconnected with the interior of the front compensation section (130); the front compensation section (130) and the rear compensation section (190) have the same specifications and are both made of a metal bellows material; the front compensation section (130) is interconnected with the interior of the water guide groove (120).

4. A check valve assembly for a downhole tool according to claim 1, characterized in that: A flow guide pipe is provided inside the pipe sleeve (140), and the pipe sleeve (140) also includes a pressure head (14a) and an internal damping rod (14e). The cross section of the pressure head (14a) is a circular structure.

5. A check valve assembly for a downhole tool according to claim 4, characterized in that: A sealing groove is provided on the right side of the guide tube, the sealing groove is sealingly engaged with the pressure head (14a), and an internal damping rod (14e) for limiting the rebound force of the spring (14b) is provided at the middle position on the right side of the pressure head (14a).

6. A check valve assembly for a downhole tool according to claim 5, characterized in that: A spring (14b) for providing a reverse force to the pressure head (14a) is provided on the outside of the inner damping rod (14e), a limiting ring (14c) for limiting the contraction position of the spring (14b) is provided on the outside of the middle position of the spring (14b), and a fixing seat (14d) for supporting the spring (14b) and the inner damping rod (14e) is provided on the right side of the spring (14b) and the inner damping rod (14e).

7. A check valve assembly for a downhole tool according to claim 6, characterized in that: A hollow support member for supporting the fixed seat (14d) is provided on the outside of the fixed seat (14d); the interior of the hollow support member is communicated with the interior of the valve body (160); the valve body (160) is a T40H-100C type rotary regulating valve.

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