Orifice blowout prevention system for coal mine production

Abstract

The utility model discloses an orifice blowout prevention system for coal mine production, which comprises a coal gas collecting cylinder, a gas outlet pipe, a gas outlet pipe, a gas outlet pipe, a gas outlet pipe, a gas outlet pipe, a gas outlet pipe and a gas outlet pipe, and is characterized in that the gas collecting cylinder is arranged close to a drill hole and provided with an inlet and a water outlet on the top and the side wall respectively; the coal-water-gas separation box and the rubber guide cylinder are located at a gas outlet of the coal-water-gas separation box, an opening in the lower end of the rubber guide cylinder extends into the coal-water-gas separation box and is used for being pulled upwards in the production process, the rubber guide cylinder is pulled out of the coal-water-gas separation box, and the lower end of the rubber guide cylinder is located in the coal-water-gas separation box all the time. Further, the gas containing volume of the coal-water-gas separation box is increased, and the flowing speed of the gas is increased; according to the utility model, gas overrun accidents caused by instant increase of gas in a construction environment due to the fact that a large amount of gas with pressure in a coal body gushes out from the hole opening of the drill hole in the drilling process during drilling can be prevented.

Description

Technical Field

[0001] The utility model belongs to the field of coal mine production, in particular to an orifice blowout prevention system used in coal mine production. Background Art

[0002] There are problems of high gas pressure and gas content in the construction area during coal mine production. The reasons for the nozzle exceeding the limit in production are as follows:

[0003] First, when the drill bit approaches or passes through the structural area, the pressurized gas will carry the drill cuttings and rush out rapidly along the borehole. It may also be continuous or intermittent until the pressure is released. In the blowhole caused by poor slag discharge or hole collapse, due to the unstable coal rock structure of the hole wall, these unstable sections are prone to collapse during the drilling process. Once a long section of large-scale hole collapse occurs, the slag discharge channel is blocked, and the water at the bottom of the hole cannot be discharged in time, resulting in increasing pressure. When the blockage resistance is less than the bottom hole pressure, a large amount of drill cuttings and water gas are discharged instantly, forming a blowhole, which causes the gas to increase. Some blowholes are formed by hole collapse due to geological reasons, and some blowholes collapse due to incomplete and incomplete slag discharge due to operational reasons.

[0004] Second, the over-limit caused by gas spraying from the center hole of the drill rod during the replacement of the drill rod. After the construction of a drill rod is completed, when the water supply tap is removed, high-pressure water and gas are sprayed from the center hole of the drill rod under pressure, first water, then pure gas, which is continuous and has a high concentration, and can easily cause over-limit. Before replacing the drill rod, sufficient water supply and slag removal should be provided, and a pressure relief tee should be installed at the faucet to relieve the pressure before replacing the drill rod. When gas is sprayed out, it needs to be extracted through the blowout prevention system.

[0005] Third, the blowhole after drilling is stopped, that is, the drilling is stopped due to human factors during the drilling construction process, and the construction is interrupted due to power outages or mechanical failures. The drill bit is just located in the coal seam, and the construction will not be affected if it is resumed in a short time. When the drilling is stopped for a long time, a large amount of gas accumulates near the drill bit. When resuming construction, the water supply must be restored and the drill rod must be rotated to discharge slag. At this time, the accumulated gas is discharged from the hole along with the coal and water. Although it is a momentary phenomenon, it will cause the gas to exceed the limit.

[0006] Fourth, the blowholes that occur after the drilling construction is completed. The blowholes appear within a period of time after the drill rod is withdrawn. It may be water-coal with gas, or it may be coal powder and gas. The main reasons are: first, the water in the hole is not drained before the drill rod is withdrawn, and a large amount of coal water remains at the bottom of the hole. After the drill is withdrawn, the borehole is blocked. Generally, it is in the coal-rock junction section or the hole wall collapse section. After a period of time, the pressurized gas accumulates and sprays out of the hole. Second, the gas content is high, and the gas around the borehole moves and accumulates into the borehole. The movement process destroys the coal wall, causing the coal wall to loosen and fall off, blocking the borehole. When the pressure increases to the limit, the coal powder gas breaks through the blockage and sprays out, which is also a gas over-limit accident.

[0007] Therefore, due to the many uncertainty factors of the spray holes, the sprayed gas and drill cuttings are generally mixed together, the gas concentration is high and the sprayed amount is also large. It is not easy to separate the coal, water and gas in a short time and to prevent the separated gas from spreading. Therefore, it is necessary to have the functions of plugging leaks, separating gas and water, and classified discharge to ensure that the sprayed gas is tightly sealed and does not leak, the coal, water and gas are separated and discharged, and the gas enters the pipeline for extraction and does not spread. Utility Model Content

[0008] The utility model aims to provide a hole blowout prevention system for coal mine production, so as to solve the problem of gas instantaneous increase in the construction environment, resulting in gas over-limit accidents.

[0009] The utility model adopts the following technical scheme: a hole blowout prevention system for coal mine production, comprising:

[0010] The gas collecting cylinder is arranged near the borehole, and an inlet and a drain are respectively provided on the top and the side wall thereof, and the inlet is connected to the borehole through a sealing pipe;

[0011] The coal-water-gas separation box has a water inlet and a gas outlet on its top; the water inlet is connected to the drain outlet of the gas collecting cylinder through a pipeline, and the gas outlet is used to discharge the separated gas out of the coal-water-gas separation box; a slag discharge port is provided on the side wall of the coal-water-gas separation box, and the slag discharge port is arranged close to the bottom and is used to discharge the residue of the coal-water-gas separation box;

[0012] The rubber guide cylinder is located at the gas outlet of the coal-water-gas separation box. The lower end opening of the rubber guide cylinder extends into the coal-water-gas separation box and is used to be pulled upward during production to pull the rubber guide cylinder out of the coal-water-gas separation box, and the lower end of the rubber guide cylinder is always in the coal-water-gas separation box, thereby increasing the gas accommodating volume of the coal-water-gas separation box and improving the gas flow rate.

[0013] Furthermore, it also includes:

[0014] The connecting cover has a through hole at its center, which is connected to the external pumping pipe. The lower side of the connecting cover is fixedly connected with a rubber guide cylinder, which is coaxially arranged with the connecting cover.

[0015] Furthermore, a drill rod inlet is provided at the bottom of the gas collecting tube, and the drill rod inlet is used for the drill rod to extend upward through the entrance of the gas collecting tube and then drill a hole to the top of the tunnel. A seal is provided at the drill rod inlet.

[0016] Furthermore, a water inlet is provided on the side wall of the gas collecting cylinder.

[0017] Furthermore, the bottom of the coal-water-gas separation box is inclined.

[0018] The beneficial effects of the utility model are:

[0019] The utility model can prevent the pressurized gas in the coal body from gushing out from the borehole in large quantities during the drilling process, causing the gas in the construction environment to increase instantly, resulting in gas over-limit accidents;

[0020] The utility model provides a coal-water-gas separation box, which provides a buffer space after the gas appears, avoids gas exceeding the limit, prevents gas from entering the tunnel to cause unsafe accidents, and has a good slag discharge effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the coal-water-gas separation box of the utility model;

[0023] Figure 3 It is a schematic diagram of the process of the utility model.

[0024] Among them: 10. Gas collecting tube; 11. Coal, water and gas separation box; 12. Inlet; 13. Rubber guide tube; 14. Connecting cover; 15. Slag discharge port; 16. Drill rod; 17. Extraction pipe; 18. Gas outlet; 19. Water inlet. DETAILED DESCRIPTION

[0025] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. The "direction" in the present utility model is based on the position of the present utility model in the Figure 1 Description of the trend in the state.

[0027] The utility model discloses a hole blowout prevention system for coal mine production, such as Figure 1-3 As shown, it includes a coal gas collecting tube 10, a coal-water-gas separation box 11, and a rubber guide tube 13.

[0028] The gas collecting tube 10 is arranged close to the borehole. An inlet 12 and a drain outlet are respectively provided on the top and side wall of the gas collecting tube 10. The inlet 12 is connected to the borehole through a sealing pipe.

[0029] A water inlet and a gas outlet 18 are respectively provided on the top of the coal-water-gas separation box 11; the water inlet is connected to the drain outlet of the gas collecting tube 10 through a pipeline, and the gas outlet 18 is used to discharge the separated gas from the coal-water-gas separation box 11; a slag discharge port 15 is provided on the side wall of the coal-water-gas separation box 11, and the slag discharge port 15 is arranged close to the bottom and is used to discharge the residue of the coal-water-gas separation box 11.

[0030] The rubber guide tube 13 is located at the gas outlet 18 of the coal-water-gas separation box 11. The lower end opening of the rubber guide tube 13 extends into the coal-water-gas separation box 11 and is used to be pulled upward during production to pull the rubber guide tube 13 out of the coal-water-gas separation box 11, and the lower end of the rubber guide tube 13 is always in the coal-water-gas separation box 11, thereby increasing the gas accommodating volume of the coal-water-gas separation box 11 and improving the gas flow rate.

[0031] The utility model also includes: a connecting cover 14, a through hole is opened in the center of the connecting cover 14, and the through hole is connected to the external extraction and discharge pipe 17. The lower side of the connecting cover 14 is fixedly connected to a rubber guide cylinder 13, and the rubber guide cylinder 13 is coaxially arranged with the connecting cover 14.

[0032] A drill rod inlet is provided at the bottom of the gas collecting tube 10, into which the drill rod 16 is inserted and extends upward through the inlet 12 of the gas collecting tube 10 to drill a hole toward the top of the tunnel. A seal is provided at the drill rod inlet.

[0033] A water inlet 19 is also provided on the side wall of the gas collecting tube 10. The bottom of the coal-water-gas separation box 11 is inclined so that the coal slag is discharged from the slag discharge port of the coal-water-gas separation box 11.

[0034] There are three channels for the gas and drill dust ejected during drilling. One is that the gas enters the construction space in a radially diffused manner after being ejected from the orifice, causing the instantaneous gas increase in the tunnel; the second is that the gas is discharged from the gap around the drill rod 16 after the orifice is sealed. Since the drill rod 16 is in a rotating state during construction, and in order to improve the dust discharge effect, the drill rod 16 is mostly made of triangular and spiral special drill rods 16, which increases the difficulty of sealing; the third is the center hole of the drill rod 16. When the drill rod 16 is replaced, the gas gathered around the drill bit is ejected from the center hole of the drill rod 16 through the drill bit drainage hole, causing the gas near the drilling rig to increase. Blocking these three channels so that the gas drill residue enters the reserved space according to the set channels is the first step of anti-blowout. The utility model can receive gas and drill dust from these three pipelines at the same time.

[0035] The utility model separates the coal, water and gas mixture entering the coal, water and gas separation box 11. By using the principle of light specific gravity of gas, the coal, water and gas can be automatically separated in a certain space after entering the coal, water and gas separation box 11, and the coal and water sink to the bottom of the box and are discharged through the reserved slag discharge port 15, while the gas floats up and enters the rubber guide cylinder 13 and the extraction pipe 17.

[0036] The gas collecting tube 10 is installed on the sealing tube. Its functions are: first, to collect the slag water discharged from the sealing tube, mix it, and then send it to the coal-water-gas separation box 11 through a pipeline; second, when the drill rod 16 is extended into the borehole through the gas collecting tube 10, a seal is installed to ensure that the drill rod 16 does not leak gas during rotation and does not generate sparks due to friction.

[0037] The use of the utility model:

[0038] During drilling, install the gas collecting cylinder 10 and connect the coal-water-gas separation box 11, then pull out the rubber guide cylinder 13, open it and hang it, connect the through hole of the connecting cover 14 with the external extraction pipe 17 to prevent overflow into the tunnel.

[0039] The above are only preferred embodiments of the present invention and are 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 blowout prevention system for coal mine production, characterized in that: include: A gas collecting cylinder (10) is arranged near the borehole, and has an inlet (12) and a drain outlet respectively formed on the top and side wall thereof, wherein the inlet (12) is connected to the borehole through a sealing pipe; A coal-water-gas separation box (11) is provided with a water inlet and a gas outlet (18) on the top thereof; the water inlet is connected to a water outlet of a coal gas collecting cylinder (10) through a pipeline, and the gas outlet (18) is used to discharge the separated gas out of the coal-water-gas separation box (11); a slag discharge port (15) is provided on the side wall of the coal-water-gas separation box (11), and the slag discharge port (15) is arranged close to the bottom and is used to discharge the residue of the coal-water-gas separation box (11); The rubber guide tube (13) is located at the gas outlet (18) of the coal-water-gas separation box (11). The lower end opening of the rubber guide tube (13) extends into the coal-water-gas separation box (11) and is used to be pulled upward during production to pull the rubber guide tube (13) out of the coal-water-gas separation box (11). The lower end of the rubber guide tube (13) is always in the coal-water-gas separation box (11), thereby increasing the gas accommodating volume of the coal-water-gas separation box (11) and improving the gas flow rate.

2. The orifice blowout prevention system for coal mine production according to claim 1, characterized in that: Also includes: The connecting cover (14) has a through hole at its center, the through hole is connected to an external extraction and discharge pipe (17), and a rubber guide cylinder (13) is fixedly connected to the lower side of the connecting cover (14), and the rubber guide cylinder (13) is coaxially arranged with the connecting cover (14).

3. The orifice blowout prevention system for coal mine production according to claim 1, characterized in that: A drill rod inlet is provided at the bottom of the gas collecting tube (10). The drill rod inlet is used for the drill rod (16) to extend upward through the inlet (12) of the gas collecting tube (10) and then drill a hole toward the top of the tunnel. A seal is provided at the drill rod inlet.

4. The orifice blowout prevention system for coal mine production according to claim 1, characterized in that: A water inlet (19) is also provided on the side wall of the gas collecting cylinder (10).

5. The orifice blowout prevention system for coal mine production according to claim 1, characterized in that: The bottom of the coal-water-gas separation box (11) is arranged inclined.

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