Water pressure switching valve and segmented side leakage device

Abstract

This application proposes a water pressure switching valve and a segmented side leakage device. The water pressure switching valve includes a valve housing; a valve body sleeved within the valve housing, the inner cavity of the valve body forming a first flow channel; a valve cap fixedly sleeved within the valve housing, on which a second flow channel and a third flow channel extending axially and spaced apart radially are provided; a first switching component is provided in the first space, the first switching component enabling the second flow channel to communicate with the first flow channel in a first operating state and cutting off the communication between the first flow channel and the second flow channel in a second operating state; a second switching component is provided in the second space, the second switching component enabling the third flow channel to cut off from the first flow channel in the first operating state and enabling the first flow channel to communicate with the third flow channel in the second operating state. This water pressure switching valve can provide water to different flow channels, realizing the switching between a blocking or side leakage state.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine production technology, specifically relating to a water pressure conversion valve and a segmented side leakage device. Background Technology

[0002] In recent years, with the annual increase in coal production and the continuous improvement of mechanization in coal mining, coal mining efficiency has been continuously improved, and the rate of expansion of the goaf area in the working face has increased. As the rock strata above the coal seam lose the support of the coal seam, they will inevitably move and be destroyed under the action of the pressure of the upper rock and their own gravity.

[0003] Currently, using underground inclined borehole height observation to monitor the degree of overburden movement and damage in goaf areas is one of the main safety production technical measures for understanding the damage patterns of the floor strata caused by mining and ensuring safe mining under pressure. This method has been widely used both domestically and internationally. The underground inclined borehole height observation method involves drilling holes at different angles above the working face in a section of the underground horizontal roadway or near the working face. The borehole height is theoretically predicted. After the borehole reaches the predicted height, a sealing device is inserted for segmented water injection. By observing the changes in water flow rate in each segment of the borehole, the degree of strata damage can be inferred, and the fracture height can be determined by the amount of leakage.

[0004] In existing technologies, the double-end sealing leak detection device is used in the downhole inclined borehole guide height observation method. However, this device has problems such as drill rod tangling and numerous probe movements when detecting the degree of overburden movement and damage in coal seams.

[0005] Therefore, new detection and efficiency enhancement technologies are urgently needed to improve the observation effect of borehole double-end sealing and leak detection devices in order to investigate the extent of coal seam overburden movement and damage in underground boreholes. Utility Model Content

[0006] To address some or all of the aforementioned technical problems in the prior art, this utility model proposes a water pressure switching valve and a segmented side leakage device. This water pressure switching valve facilitates the simultaneous injection of water into the packer and the throttle, thereby increasing the efficiency of injecting water into multiple segments at once.

[0007] According to one aspect of this utility model, a water pressure switching valve is provided, comprising:

[0008] cylindrical valve housing,

[0009] A valve body is fitted inside the valve housing, and the inner cavity of the valve body forms a first flow channel.

[0010] A valve cap is fixedly fitted inside the valve body. The valve cap has a second flow channel and a third flow channel extending axially and spaced apart radially. An inner groove is provided on one end face of the valve cap near the valve body. A partition is provided within the inner groove to divide it into a first space communicating with the second flow channel and a second space communicating with the third flow channel.

[0011] A first conversion component is provided within the first space. In a first operating state, the first conversion component connects the second flow channel to the first flow channel. In a second operating state, the first conversion component disconnects the connection between the first flow channel and the second flow channel.

[0012] A second conversion component is provided in the second space. In the first working state, the second conversion component cuts off the third flow channel from the first flow channel. In the second working state, the second conversion component connects the first flow channel with the third flow channel.

[0013] In one embodiment, the first conversion component includes:

[0014] A first valve cover, disposed within the inner groove and axially slidably connected to the inner groove, has a first notch.

[0015] A first protrusion is provided on the wall of the partition, and the first notch is connected to the first protrusion in a concave-convex fit in the second working state.

[0016] The second conversion component includes:

[0017] A second valve cover is disposed within the inner groove and axially slidably connected to the inner groove, and a second notch is provided on the second valve cover.

[0018] The second protrusion is disposed on the wall of the partition, and the second notch and the second protrusion are connected in a concave-convex fit in the first working state.

[0019] In one embodiment, the valve body is axially movable to the valve housing, the end face of the valve body opposite to the valve cap forms a receiving surface, the end of the valve body near the valve cap abuts against the first valve cover and the second valve cover, and the valve body is configured to push the first valve cover and the second valve cover to move from a first working state to a second working state.

[0020] In one embodiment, an elastic element is provided between the first valve cover and the bottom wall of the inner groove, and between the second valve cover and the bottom wall of the inner groove.

[0021] In one embodiment, the elastic element is a spring.

[0022] In one embodiment, a clearance groove that snaps onto the partition is provided at one end of the valve body near the valve cap.

[0023] According to another aspect of the present invention, a segmented side leakage device is provided, comprising:

[0024] Drill pipe,

[0025] A segmented side-leakage pipe string is connected to one end of the drill pipe. The segmented side-leakage pipe string contains multiple sets of side-leakage assemblies and a packer disposed at the downstream end of each side-leakage assembly. Each side-leakage assembly includes the aforementioned water pressure switching valve, packer, and throttle arranged sequentially. The second flow channel of each water pressure switching valve is used to communicate with the corresponding set of packers, and the third flow channel of each water pressure switching valve is used to communicate with the corresponding throttle.

[0026] A water injection system for supplying water to the drill pipe.

[0027] In one embodiment, three packers are provided on the segmented side-leaking pipe string.

[0028] In one embodiment, the water injection system includes a water supply pipe connected to a water source and a water injection pump mounted on the water supply pipe.

[0029] In one embodiment, a flow meter and a pressure gauge are installed on the water supply pipe.

[0030] Compared with the prior art, the advantages of this utility model are as follows: the water pressure conversion valve has a second flow channel and a third flow channel. Through the first conversion component and the second conversion component, the first flow channel can be connected to the second flow channel and the third flow channel respectively under different working conditions. This is used to inject water into the packer and the throttle in different time periods, which helps to realize segmented side leakage on multiple sections, thereby reducing the number of times the segmented side leakage device is moved and improving the water injection effect. Attached Figure Description

[0031] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, in which:

[0032] Figure 1 An exploded view of a water pressure switching valve according to an embodiment of the present invention is shown;

[0033] Figure 2 This shows a cross-sectional view of a water pressure switching valve in a first operating state according to an embodiment of the present invention;

[0034] Figure 3 This shows a cross-sectional view of a water pressure switching valve in a second operating state according to an embodiment of the present invention;

[0035] Figure 4A segmented side leakage device according to an embodiment of the present invention is shown.

[0036] In the accompanying drawings, the same parts are labeled with the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0037] To make the technical solution and advantages of this utility model clearer, the exemplary embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0038] In the description of this utility model, it should be noted that the terms "inner," "outer," "upper," "lower," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] An embodiment of this utility model provides a water pressure switching valve. For example... Figures 1 to 3 As shown, the water pressure switching valve 100 includes a valve housing 1, a valve body 2, a valve cap 3, a first switching assembly, and a second switching assembly. The valve housing 1 is cylindrical and primarily serves as an outer casing for the main body. The valve body 2 is fitted inside the valve housing 1. The valve body 2 is also cylindrical, with its inner cavity forming a first flow channel 21. The valve cap 3 is fixedly fitted inside the valve housing 1. A second flow channel 31 and a third flow channel 32 are provided on the valve cap 3. These two flow channels 31 and 32 extend along the axial direction of the valve cap 3 and are radially spaced apart. An inner groove 33 is provided on the end face of the valve cap 3 near the valve body 2. A partition 34 is provided within the inner groove 33. This partition 34 serves to divide the space of the inner groove 33, forming a first space 35 communicating with the second flow channel 31 and a second space 36 communicating with the third flow channel 32. The first switching assembly is disposed within the first space 35. The second switching assembly is disposed within the second space 36. In the first operating state, the first conversion component connects the second flow channel 31 to the first flow channel 21, while the second conversion component disconnects the third flow channel 32 from the first flow channel 21. At this time, only the second flow channel 31 can receive liquid from the first flow channel 21. In the second operating state, the first conversion component disconnects the connection between the first flow channel 21 and the second flow channel. Simultaneously, the second conversion component connects the first flow channel 21 to the third flow channel 32. At this time, only the third flow channel 32 can receive fluid from the first flow channel 21.

[0040] As can be seen, the water pressure switching valve 100 has a second flow channel 31 and a third flow channel 32. Through the first switching component and the second switching component, the first flow channel 21 can be connected to the second flow channel 31 and the third flow channel 32 respectively under different working conditions. This is used to inject water into the packer 201 and the throttle 202 in stages, which helps to achieve segmented side leakage, reduces the number of times the segmented side leakage device is moved, and improves the water injection effect. In addition, the partition space formed by the inner groove 33 of the valve cap 3 and the baffle 34 ensures the physical isolation of the two flow channels during the switching process, effectively preventing fluid crossflow. The two working modes can be quickly switched through a single valve.

[0041] In one embodiment, the first conversion assembly includes a first valve cover 4 and a first protrusion 37. The first valve cover 4 is disposed within an inner groove 33 and is axially slidably connected to the inner groove 33. A first notch 41 is provided on the first valve cover 4. The first protrusion 37 is disposed on the wall of the partition 34. The first notch 41 and the first protrusion 37 are in a convex-concave fit connection in a second operating state. Meanwhile, the second conversion assembly includes a second valve cover 5 and a second protrusion 38. The second valve cover 5 is disposed within an inner groove 33 and is axially slidably connected to the inner groove 33. A second notch 51 is provided on the second valve cover 5. The second protrusion 38 is disposed on the wall of the partition 34. The second notch 51 and the second protrusion 38 are in a convex-concave fit connection in a first operating state. Therefore, in the first operating state, the second notch 51 and the second protrusion 38, in their concave-convex fit, block the third flow channel 32. At this time, the first notch 41 and the first protrusion 37 are axially spaced apart in the valve cap 3, so that after the fluid passes through the first flow channel 21, it enters the inner groove 33, and then enters the second flow channel 31 through the first notch 41, ensuring that the first flow channel 21 and the second flow channel 31 are connected, while the first flow channel 21 and the third flow channel 32 are cut off. In the second operating state, the first notch 41 and the first protrusion 37, in their concave-convex fit, block the second flow channel 31. At this time, the second notch 51 and the second protrusion 38, axially spaced apart in the valve cap 3, so that after the fluid passes through the first flow channel 21, it enters the inner groove 33, and then enters the third flow channel 32 through the second notch 51, ensuring that the first flow channel 21 and the third flow channel 32 are connected, while the first flow channel 21 and the second flow channel 31 are cut off.

[0042] The valve body 2 is axially movable relative to the valve housing 1. That is, the valve body 2 can move axially relative to the valve housing 1. The end face of the valve body 2 facing away from the valve cap forms a receiving surface 22 to receive fluid pressure. When the fluid pressure is sufficient, it can actuate the valve body 2 relative to the valve housing 1. The end of the valve body 2 near the valve cap 3 abuts against the first valve cover 4 and the second valve cover 5. Therefore, the valve body 2 can push the first valve cover 4 and the second valve cover 5 to move, causing the water pressure switching valve 100 to move from a first operating state to a second operating state.

[0043] An elastic element 6 is provided between the first valve cover 4 and the bottom wall of the inner groove 33. An elastic element 6 is also provided between the second valve cover 5 and the bottom wall of the inner groove 33. Preferably, the elastic element 6 is a spring. One end of the spring abuts against the bottom wall of the inner groove 33, and the other end abuts against the valve covers 4 and 5. This elastic element 6 is mainly used for resetting the first valve cover 4 and the second valve cover 5.

[0044] A clearance groove 23 is provided at one end of the valve body 2 near the valve cap 3. The clearance groove 23 is engaged with the partition plate 34. The clearance groove 23 ensures that the valve body 2 can move axially.

[0045] This application also relates to a segmented side leakage device. For example... Figure 4 As shown, the segmented side-leakage device includes a drill pipe 301, a segmented side-leakage pipe string, and a water injection system. The drill pipe 301 is a structure on the drilling rig 300. The segmented side-leakage pipe string is connected to one end of the drill pipe 301. The segmented side-leakage pipe string contains segmented side-leakage components and packers 201 located downstream of the segmented side-leakage components. Multiple sets of segmented side-leakage components are connected sequentially. Each set of segmented side-leakage components includes a water pressure conversion valve 100, a packer 201, and a throttle 202 arranged sequentially. That is, multiple packers 201 are spaced apart on the segmented side-leakage pipe string, and throttles 202 are arranged between adjacent packers 201. Except for the packer 201 at the downstream end, a water pressure conversion valve 100 is installed upstream of each of the other packers 201. As can be seen, a water pressure switching valve 100 needs to be installed at the front end of a set of sequentially connected packers 201 and throttles 202 to switch water injection and inject water into these two components. The upstream water pressure switching valve 100 can be connected to the drill pipe 301, for example, via a valve housing 1 threadedly. It is easy to understand that the second flow channel 31 of each water pressure switching valve 100 is used to communicate with the packers 201 in this set. The third flow channel 32 of each water pressure switching valve 100 is used to communicate with the throttles 202 in this set. In the water pressure switching valves 100, the first flow channel 21 of the downstream water pressure switching valve 100 is connected to the upstream throttle 202, while the first flow channel 21 of the upstream water pressure switching valve 100 is connected to the drill pipe 301. The water injection system is used to supply water to the drill pipe 301.

[0046] In one example, if three packers 201 are installed on the segmented side leakage pipe string, then a total of two throttles 202 are installed on the segmented side leakage pipe string, and a total of two water pressure switching valves 100 are installed on the segmented side leakage pipe string. Each water pressure switching valve 100 is used to switch the water injection operation between the packers 201 and the throttles 202 in that group. Both the packers 201 and the throttles 202 are products of the prior art. For example, the packer 201 can be a K344 steel strip packer, manufactured by Puyang Maixin Petroleum Machinery Equipment Co., Ltd., while the throttle 202 is a constant pressure shut-off valve manufactured by Yihua Pump Industry Co., Ltd.

[0047] The water injection system includes a water supply pipe 402 and a water injection pump 403. The water supply pipe 402 is connected to a water source 401 and is used to transport water. The water injection pump 403 is installed on the water supply pipe 402 and is used to pump water. A flow meter 404 and a water pressure gauge 405 are also installed on the water supply pipe 402.

[0048] The following is based on Figures 1 to 4 Describe the working principle of the segmented side leakage device.

[0049] First, a water injection leak detection borehole is drilled into the coal seam roof from the roadway. Driven by drill rod 301, the segmented side leakage pipe string of the segmented side leakage device is sent into the borehole. At this time, all the springs of the water pressure conversion valves 100 are in the initial state, and the first valve cover 4 and the second valve cover 5 are also in the first working state.

[0050] The water pump 403 is started, supplying water to the drill pipe 301 through the water supply pipe 402. For example, the pumped water flow rate is 0.5 cubic meters per hour. After the water flows through the drill pipe 301, it acts on the receiving surface 22 of the upstream water pressure switching valve 100. The pressure generated by the water acting on the receiving surface 22 is insufficient to overcome the force generated by the spring of the water pressure switching valve 100, so the first valve cover 4 and the second valve cover 5 remain in the first working state. At this time, after the water passes through the first flow channel 21 of the water pressure switching valve 100, it enters the second flow channel 31 through the first notch 41, ensuring that the first flow channel 21 and the second flow channel 31 are connected, for supplying water to the upstream packer 201. The water flows into the capsule of the packer 201, causing the packer 201 to expand and seal. Meanwhile, since the second notch 51 on the second valve cover 5 and the second protrusion 38 are in a concave-convex fit to form a baffle, the third flow channel 32 is blocked, so water cannot be supplied to the throttle 202.

[0051] The pressure gauge 405 was monitored and found to have reached the preset pressure value, which proved that the packer 201 at the upstream end had completed its sealing function.

[0052] Adjust the water pump 403 to increase the water flow rate, for example, to 1 cubic meter per hour. Water acts on the receiving surface 22 of the upstream water pressure switching valve 100. The pressure generated by the water on the receiving surface 22 overcomes the force generated by the spring, causing the first valve cover 4 and the second valve cover 5 to move. This causes the first notch 41 of the first valve cover 4 to engage with the first protrusion 37, thereby blocking the second flow channel 31. It also causes the second notch 51 of the second valve cover 5 to disengage from the second protrusion 38, thereby connecting the third flow channel 32 with the first flow channel 21. At this time, because the second flow channel 31 is blocked from connecting to the first flow channel 21, the capsule of the upstream packer 201 remains sealed. Water then enters the upstream throttle 202.

[0053] Then, water enters the first flow channel 21 of the second pressure switching valve 100. The second pressure switching valve 100 operates in the first working state, actuating the packer 201 in its group to perform sealing.

[0054] The water flow rate is further increased, causing the second pressure switching valve 100 to inject water into the throttle valve 202 of its group. The throttle valve 202 of the second group then delivers the water downstream.

[0055] Based on the above operation, each packer 201 in the segmented side leakage assembly is sealed, and the throttle 202 is connected to the water injection.

[0056] The downstream throttle 202 injects water into the downstream packer 201, causing the packer 201 to seal. At this time, all packers 201 on the segmented side leakage pipe string are sealed.

[0057] As the water injection operation proceeds, water accumulates within the throttle 202 and eventually flows into the borehole. According to the test requirements, record the water injection time, the volume of water injected, and any abnormal situations.

[0058] As can be seen, packers 201 are sealed sequentially from upstream to downstream until all packers 201 are sealed. Before the downstream packer 201 is sealed, all throttles 202 serve to connect the segmented side leakage pipe strings. Only after all packers 201 are sealed do throttles 202 inject water into the borehole.

[0059] After the side leakage test is completed, water injection is stopped. The springs of each water pressure switching valve 100 release energy, and the first valve cover 4 and the second valve cover 5 reset, returning to the first working state. At this time, the outlet of the packer 201 opens, and the packer 201 is depressurized. The segmented side leakage pipe string is then pulled out of the borehole or sent to the next borehole segment using the drill rod 301.

[0060] The segmented side-leakage device of this application is suitable for observing the degree of overburden movement and damage in goaf areas using elevation monitoring in downhole inclined boreholes. Increasing the number of plugs and performing water injection operations on multiple sections can reduce the number of times the segmented side-leakage device needs to be moved, thus reducing workload. During the plugging and leak detection process, the segmented side-leakage pipe string is moved via the drill pipe for multi-end segmented leak detection. The water injection system supplies high and low pressure water through a high-low pressure conversion structure, and the pressure data changes in the water injection borehole are monitored in real time by flow meters and pressure gauges. The monitoring data is used to determine the completion status of plugging and leak detection, so that pressurized water sequentially completes the processes of plugging, leak detection, and water discharge, significantly improving the water injection control effect. The segmented side-leakage device enriches the means of elevation monitoring in downhole inclined boreholes and has important practical value and broad application prospects for pressurized safe mining and prevention of floor accidents.

[0061] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the present invention, and all changes and / or modifications made according to the embodiments of the present invention should be covered within the protection scope of the present invention.

Claims

1. A water pressure transfer valve characterized by, include: cylindrical valve housing, A valve body is fitted inside the valve housing, and the inner cavity of the valve body forms a first flow channel. A valve cap is fixedly fitted inside the valve body. The valve cap has a second flow channel and a third flow channel extending axially and spaced apart radially. An inner groove is provided on one end face of the valve cap near the valve body. A partition is provided within the inner groove to divide it into a first space communicating with the second flow channel and a second space communicating with the third flow channel. A first conversion component is provided within the first space. In a first operating state, the first conversion component connects the second flow channel to the first flow channel. In a second operating state, the first conversion component disconnects the connection between the first flow channel and the second flow channel. A second conversion component is provided in the second space. In the first working state, the second conversion component cuts off the third flow channel from the first flow channel. In the second working state, the second conversion component connects the first flow channel with the third flow channel.

2. The water pressure transfer valve according to claim 1, characterized by The first conversion component includes: A first valve cover, disposed within the inner groove and axially slidably connected to the inner groove, has a first notch. A first protrusion is provided on the wall of the partition, and the first notch is connected to the first protrusion in a concave-convex fit in the second working state. The second conversion component includes: A second valve cover is disposed within the inner groove and axially slidably connected to the inner groove, and a second notch is provided on the second valve cover. The second protrusion is disposed on the wall of the partition, and the second notch and the second protrusion are connected in a concave-convex fit in the first working state.

3. The water pressure switching valve according to claim 2, characterized in that, The valve body is axially movable to the valve housing. The end face of the valve body facing away from the valve cap forms a receiving surface. The end of the valve body near the valve cap abuts against the first valve cover and the second valve cover. The valve body is configured to push the first valve cover and the second valve cover from a first working state to a second working state.

4. The water pressure switching valve according to claim 3, characterized in that, An elastic element is provided between the first valve cover and the bottom wall of the inner groove, and between the second valve cover and the bottom wall of the inner groove.

5. The water pressure switching valve according to claim 4, characterized in that, The elastic element is a spring.

6. The water pressure switching valve according to claim 3, characterized in that, An avoidance groove is provided at one end of the valve body near the valve cap, which is snapped onto the partition plate.

7. A segmented side leakage device, characterized in that, include: Drill pipe, A segmented side-leakage pipe string connected to one end of the drill pipe, the segmented side-leakage pipe string containing multiple sets of side-leakage assemblies and a packer disposed at the downstream end of the side-leakage assemblies, wherein each side-leakage assembly includes a water pressure switching valve, a packer, and a throttle arranged sequentially according to any one of claims 1 to 6, a second flow channel of each water pressure switching valve being used to communicate with the corresponding set of packers, and a third flow channel of each water pressure switching valve being used to communicate with the corresponding throttle. A water injection system for supplying water to the drill pipe.

8. The segmented side leakage device according to claim 7, characterized in that, Two sets of the side leakage components are provided on the segmented side leakage pipe string.

9. The segmented side leakage device according to claim 7, characterized in that, The water injection system includes a water supply pipe connected to a water source and a water injection pump installed on the water supply pipe.

10. The segmented side leakage device according to claim 9, characterized in that, A flow meter and a water pressure gauge are installed on the water supply pipe.

Images