Gas extraction drilling protection device

Abstract

The utility model discloses a gas extraction drilling protection device, relates to the technical field of coal mines, and mainly aims to treat harmful gas gushing out in the drilling process. According to the main technical scheme, the gas extraction drilling protection device comprises a guide part, a separation box and a gas extraction mechanism; the guide part comprises a sleeve and a four-way valve, one end of the sleeve is connected to one end of the four-way valve, and the guide part is used for enabling the drill rod to sequentially penetrate through the four-way valve and the sleeve; a partition plate is arranged in the separation box and used for dividing the separation box into a left box body and a right box body, a through hole is formed in the lower end of the partition plate, an upper port of the four-way valve is connected to the top wall of the right box body, a lower port of the four-way valve is connected to the lower end side of the right box body, and the upper end side of the left box body is connected to the overflow pipe. The air extraction mechanism comprises an extraction main pipe and a collecting box, the top wall of the collecting box is connected to the top wall of the right box body, and an inlet of the extraction main pipe is connected to the top wall of the collecting box.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mines, in particular to a gas drainage borehole protection device. Background Art

[0002] At present, during the process of water exploration and drainage in coal mines, harmful gases in the coal seam will gush out together with the water in the borehole, which will also cause harm to workers. The main harmful gas in coal mines is gas.

[0003] Gas is one of the main disasters in coal mines, and gas drainage is the main method to solve gas disasters. The gas content in the coal seam is uneven, and there are many uncertain factors during the construction of gas drainage boreholes. Gas has gushed out abnormally during the pre-exploration borehole construction in the driving face of the mine, resulting in an over-limit alarm accident of the methane sensor in the driving face. Content of the Utility Model

[0004] In view of this, an embodiment of the utility model provides a gas drainage borehole protection device, and the main purpose is to handle the harmful gases gushing out during the borehole process.

[0005] To achieve the above purpose, the utility model mainly provides the following technical solutions:

[0006] An embodiment of the utility model provides a gas drainage borehole protection device, which includes: a guiding part, a separation box and an air extraction mechanism;

[0007] The guiding part includes a casing and a four-way valve. One end of the casing is connected to one end of the four-way valve, and is used for enabling a drill pipe to pass through the four-way valve and the casing in sequence;

[0008] A partition is arranged in the separation box and is used for separating the separation box into a left box body and a right box body. A through hole is arranged at the lower end of the partition. The upper port of the four-way valve is connected to the top wall of the right box body, the lower port of the four-way valve is connected to the lower side of the right box body, and the upper side of the left box body is connected to an overflow pipe;

[0009] The air extraction mechanism includes a main extraction pipe and a collection box. The top wall of the collection box is connected to the top wall of the right box body, and the inlet of the main extraction pipe is connected to the top wall of the collection box.

[0010] The purpose of the utility model and the solution of its technical problems can be further realized by adopting the following technical measures.

[0011] Optionally, the top wall position of the left box body is lower than the top wall position of the right box body.

[0012] Optionally, the collection box includes an upper box body and a lower box body. The upper box body and the lower box body are connected by a first pipeline, and a first valve is installed on the first pipeline. The top wall of the upper box body is connected to the top wall of the right box body. The inlet of the main extraction pipe is connected to the top wall of the upper box body. The lower end side of the lower box body is connected to a drain pipe, and a drain valve is installed on the drain pipe.

[0013] Optionally, the top wall of the lower box body is connected to an exhaust pipe, and an exhaust valve is installed on the exhaust pipe.

[0014] Optionally, a second valve is further included. One end of the sleeve is connected to one end of the four-way valve through the second valve.

[0015] Optionally, a pressure gauge is further included. The pressure gauge is connected to the pipe wall of the sleeve.

[0016] By means of the above technical solution, the utility model has at least the following advantages:

[0017] To solve the problem of abnormal gas outburst during the construction of the extraction borehole, the mine uses a drill bit with a diameter of 120 mm to open a hole with a depth of 15 m, then withdraws and replaces the drill bit with a diameter of 275 mm for reaming with a depth of 15 m, embeds a sleeve with a diameter of 200 mm, fixes the space between the pipe wall of the sleeve and the mine working face with polyurethane, and performs cement grouting, and fixes the sleeve in the driving working face with pipe fixing flat iron and anchor bolts, keeps the pressure at 1.5 Mpa for 15 minutes, connects one end flange of the four-way valve to one end of the sleeve, and then passes the drill pipe through the four-way valve and the sleeve in sequence for borehole operation.

[0018] During the above borehole operation process, the mixture of coal slag, drilling water and gas gushes out along the sleeve to the four-way valve. In the four-way valve, the gas is discharged from the upper port of the four-way valve to the upper gas phase space of the right box body, and the drilling water and coal slag are discharged from the lower port of the four-way valve to the lower liquid phase space of the right box body.

[0019] During the above process, due to the suction driving force of the main extraction pipe, a gas phase flow from the right box body to the collection box is generated, so that the gas in the right box body is transferred to the collection box in time and is centrally collected and processed through the main extraction pipe, and a small amount of liquid droplets entering the collection box with the air flow condense and settle to the bottom of the collection box.

[0020] During the above process, the left box body and the right box body are connected through the through hole at the lower end of the partition board. Therefore, the water in the right box body enters the left box body and flows out through the overflow pipe. In this way, the gas phase in the separation box will not be blocked by pressure. At the same time, due to the existence of the partition board, a liquid seal effect is formed (gas phase gas is insoluble in water), and the gas phase gas will not reach the overflow pipe, ensuring that the gas can be completely sucked by the main extraction pipe.

[0021] Through the above process, the sufficiency of collecting and treating the harmful gas of the gas gushing out from the drilling and tunneling working face is ensured. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a gas drainage borehole protection device provided by an embodiment of the present invention.

[0023] The reference numerals in the accompanying drawings of the specification include: casing 1, four-way valve 2, drill pipe 3, partition plate 4, right box body 5, left box body 6, through hole 7, overflow pipe 8, extraction main pipe 9, collection box 10, upper box body 101, lower box body 102, first pipe 11, first valve 12, drain pipe 13, drain valve 14, liquid level gauge 15, exhaust pipe 16, exhaust valve 17, second valve 18, pressure gauge 19. Detailed Embodiments

[0024] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended utility model purpose, the following combines the accompanying drawings and preferred embodiments to detail the specific embodiments, structures, features, and effects according to the present invention application. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 As shown, a gas drainage borehole protection device provided by an embodiment of the present invention includes: a guiding part, a separation box, and an air extraction mechanism;

[0027] The guiding part includes a casing 1 and a four-way valve 2. One end of the casing 1 is connected to one end of the four-way valve 2 for enabling the drill pipe 3 to pass through the four-way valve 2 and the casing 1 in sequence;

[0028] A partition plate 4 is arranged in the separation box for separating the separation box into a left box body 6 and a right box body 5. A through hole 7 is arranged at the lower end of the partition plate 4. The upper port of the four-way valve 2 is connected to the top wall of the right box body 5, the lower port of the four-way valve 2 is connected to the lower side of the right box body 5, and the upper side of the left box body 6 is connected to the overflow pipe 8;

[0029] The air extraction mechanism includes an extraction main pipe 9 and a collection box 10. The top wall of the collection box 10 is connected to the top wall of the right box body 5, and the inlet of the extraction main pipe 9 is connected to the top wall of the collection box 10.

[0030] The working process of the gas drainage borehole protection device is as follows:

[0031] In order to solve the problem of abnormal gas outburst during the extraction drilling construction, the mine uses a 120mm diameter drill bit to drill a hole with a depth of 15m, and then withdraws and replaces it with a 275mm diameter drill bit to expand the hole with a depth of 15m. The casing 1 with a diameter of 200mm is pre-buried, and the casing 1 wall and the mine working face are fixed with polyurethane, and cement grouting is performed. The casing 1 is fixed to the excavation working face with a fixing pipe flat iron and an anchor rod, and the pressure is maintained at 1.5Mpa for 15 minutes. One end of the four-way valve 2 is flange-connected to one end of the casing 1, and then the drill rod 3 is passed through the four-way valve 2 and the casing 1 in turn to carry out the drilling operation.

[0032] During the above-mentioned drilling operation, a mixture of coal slag, drilling water and gas flows out along the casing 1 to the four-way valve 2. Inside the four-way valve 2, the gas is discharged from the upper port of the four-way valve 2 to the upper gas phase space of the right box 5, and the drilling water and coal slag are discharged from the lower port of the four-way valve 2 to the lower liquid phase space of the right box 5.

[0033] In the above process, due to the suction driving force of the extraction main pipe 9, a gas phase flow is generated from the right box 5 to the collecting box 10, so that the gas in the right box 5 is transferred to the collecting box 10 in time, and is centrally collected and processed through the extraction main pipe 9, while a small amount of liquid droplets entering the collecting box 10 with the airflow condense and settle to the bottom of the collecting box 10.

[0034] In the above process, the left box body 6 and the right box body 5 are connected through the through hole 7 at the lower end of the partition 4, so the moisture in the right box body 5 enters the left box body 6 and flows out through the overflow pipe 8. In this way, there will be no gas pressure buildup in the separation box. At the same time, due to the existence of the partition 4, a liquid seal effect is formed (gaseous gas is insoluble in water), and the gaseous gas will not reach the overflow pipe 8, ensuring that the gas can be completely sucked out by the extraction main pipe 9.

[0035] In the technical solution of the utility model, it is ensured that the harmful gas gushing out from the drilling and excavation working face is fully collected and processed.

[0036] Specifically, the four-way valve 2 is cross-shaped, and includes a first port, a second port, a third port and a fourth port. The central axis of the first port coincides with the central axis of the third port, and the central axis of the second port coincides with the central axis of the fourth port. The third port is connected to one end of the casing 1 to facilitate the drill rod 3 to horizontally pass through the first port and the third port in sequence and be inserted into the casing 1. The second port forms the upper port of the four-way valve 2, and the fourth port forms the lower port of the four-way valve 2.

[0037] Specifically, the inlet of the extraction main pipe 9 is connected to the top wall of the collection box 10, and the outlet of the extraction main pipe 9 is connected to the negative pressure mechanism; the inlet of the extraction main pipe 9 is connected to the top wall of the collection box 10 through two parallel extraction valves.

[0038] Specifically, it further includes a connecting pipe. One end of the connecting pipe is connected to the top wall of the right box body 5, and the other end of the connecting pipe is connected to the top wall of the collection box 10 through two control valves connected in parallel.

[0039] In the specific embodiment, the top wall position of the left box body 6 is lower than the top wall position of the right box body 5.

[0040] In this embodiment, specifically, the top wall position of the left box body 6 is lower than the top wall position of the right box body 5, and the position of the overflow pipe 8 is also lower than the top wall position of the right box body 5. In this way, even if the internal pressure of the right box body 5 is lower than the external pressure, making the liquid level height of the left box body 6 lower than the liquid level height of the right box body 5 (communicating vessel principle), the right box body 5 can still retain a certain upper gas phase space to ensure that the gas can smoothly enter the collection box 10.

[0041] In the specific embodiment, the collection box 10 includes an upper box body 101 and a lower box body 102. The upper box body 101 and the lower box body 102 are connected by a first pipeline 11. A first valve 12 is installed on the first pipeline 11. The top wall of the upper box body 101 is connected to the top wall of the right box body 5. The inlet of the main extraction pipeline 9 is connected to the top wall of the upper box body 101. The lower end side of the lower box body 102 is connected to a drain pipe 13. A drain valve 14 is installed on the drain pipe 13.

[0042] In this embodiment, specifically, during the operation of the device, in the collection box 10, when the condensed liquid level of the collected liquid droplets rises to the upper box body 101, the first valve 12 is closed to isolate the upper box body 101 and the lower box body 102, and then the drain valve 14 is opened to drain the condensed liquid in the lower box body 102; when the condensed liquid in the lower box body 102 is drained out, the drain valve 14 is closed again, and the first valve 12 is opened.

[0043] Specifically, a liquid level gauge 15 is installed on the side wall of the upper box body 101 to facilitate the operator to timely confirm whether the condensed liquid level has risen to the upper box body 101.

[0044] In the specific embodiment, the top wall of the lower box body 102 is connected to an exhaust pipe 16. An exhaust valve 17 is installed on the exhaust pipe 16.

[0045] In this embodiment, specifically, when draining the lower box body 102, the exhaust valve 17 is opened first to make the air pressure in the lower box body 102 become normal pressure, and then the drain valve 14 is opened to drain the water.

[0046] In the specific embodiment, it further includes a second valve 18. One end of the sleeve 1 is connected to one end of the four-way valve 2 through the second valve 18.

[0047] In this embodiment, specifically, after the drilling and hole sealing are completed, the second valve 18 is closed to conduct a pressure test on the quality of the drilling hole sealing. If it is used for water exploration and drainage, water inrush can be effectively prevented and the water output can be controlled. At the same time, after the drilling construction is completed, if the connection and pumping cannot be carried out in time, the second valve 18 is closed, and gas overflow in the pipe can also be prevented.

[0048] In the specific embodiment, it further includes a pressure gauge 19, and the pressure gauge 19 is connected to the pipe wall of the casing 1.

[0049] In this embodiment, specifically, the operator can timely observe the pressure inside the casing 1 through the pressure gauge 19.

[0050] As mentioned above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A gas extraction drilling protection device, characterized in that: include: A guide part, the guide part comprising a casing and a four-way valve, one end of the casing being connected to one end of the four-way valve, and being used for allowing the drill pipe to pass through the four-way valve and the casing in sequence; A separation box, wherein a partition is provided inside the separation box for dividing the separation box into a left box body and a right box body, a through hole is provided at the lower end of the partition, an upper port of the four-way valve is connected to the top wall of the right box body, a lower port of the four-way valve is connected to the lower end side of the right box body, and an upper end side of the left box body is connected to an overflow pipe; The air extraction mechanism comprises an extraction main pipe and a collection box, the top wall of the collection box is connected to the top wall of the right box body, and the inlet of the extraction main pipe is connected to the top wall of the collection box.

2. The gas extraction drilling protection device according to claim 1, characterized in that: The top wall position of the left box body is lower than the top wall position of the right box body.

3. The gas extraction drilling protection device according to claim 1, characterized in that: The collecting box comprises an upper box body and a lower box body, the upper box body and the lower box body are connected by a first pipe, the first pipe is equipped with a first valve, the top wall of the upper box body is connected to the top wall of the right box body, the inlet of the extraction main pipe is connected to the top wall of the upper box body, and the lower end side of the lower box body is connected to a drain pipe, and the drain pipe is equipped with a drain valve.

4. The gas extraction drilling protection device according to claim 3, characterized in that: The top wall of the lower box body is connected to an exhaust pipe, and an exhaust valve is installed on the exhaust pipe.

5. The gas extraction drilling protection device according to any one of claims 1 to 4, characterized in that: It also includes a second valve, and one end of the sleeve is connected to one end of the four-way valve through the second valve.

6. The gas extraction drilling protection device according to any one of claims 1 to 4, characterized in that: It also includes a pressure gauge, which is connected to the pipe wall of the casing.

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