Blowout prevention structure for coal mine drilling

Abstract

The utility model discloses a coal mine drilling blowout prevention structure which comprises a main pipe, a flange at one end of the main pipe is connected with a blind plate for sealing one end of the main pipe, a through hole allowing a drill rod to pass through is formed in the blind plate, and the through hole and the main pipe are coaxially arranged; a flange at the other end of the main pipe is connected with a short connecting pipe which can be hermetically connected with a drilling hole opening and allows a drilling rod to pass through; a top flange of the main pipe is connected with a butterfly valve, the top of the main pipe is connected with a high-pressure straight-through pipe, and a bottom flange of the main pipe is connected with another butterfly valve. According to the utility model, drilling and gas extraction can be realized at the same time, and gas gushing out of a drill hole can be extracted in time; and when the drilling hole is sprayed, the drilling hole is sealed in time, the gas is pumped out, the gas is prevented from being sprayed out, and safety accidents are avoided.

Description

Technical Field

[0001] The utility model relates to a coal mine drilling blowout prevention structure and belongs to the technical field of gas control equipment. Background Art

[0002] With the increase in mining depth and the extension of mining work, the gas content and pressure of coal seams are gradually increasing. During the construction of gas extraction drilling, blowouts often occur, which often lead to local gas exceeding the limit, hole blockage and drill jamming, which seriously affects the drilling progress and easily causes safety accidents. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a coal mine drilling blowout prevention structure to solve the technical problems existing in the above-mentioned prior art.

[0004] The technical solution adopted by the utility model is: a coal mine drilling blowout prevention structure, comprising a main pipe, one end of the main pipe is flange-connected with a blind plate closing one end of the main pipe, the blind plate is provided with a through hole allowing a drill rod to pass through, and the through hole is coaxially arranged with the main pipe; the other end of the main pipe is flange-connected with a short pipe that can be sealed and connected to the borehole mouth and allows the drill rod to pass through; the top flange of the main pipe is connected with a butterfly valve, the top of the main pipe is connected with a high-pressure straight-through pipe, and the bottom flange of the main pipe is connected with another butterfly valve.

[0005] Preferably, the main pipe is a 6-inch pipe, the flange is a 4-inch flange, and the short pipe is a 4-inch pipe.

[0006] Preferably, a rubber pad is provided in the middle of the flange connection between the main pipe and the short pipe.

[0007] Preferably, the inner diameter of the high-pressure straight-through pipe is 18-20 mm.

[0008] Preferably, the diameter of the end of the short pipe away from the main pipe gradually decreases to be in a frustum shape.

[0009] Beneficial effects of the utility model:

[0010] 1. Compared with the prior art, the utility model can realize gas extraction while drilling, and the gas gushing out of the borehole can be extracted in time; when a borehole blowout occurs, the borehole is closed in time, the gas is extracted and released, and the gas blowout is prevented, thereby avoiding the occurrence of safety accidents.

[0011] 2. Compared with the prior art, the utility model has a simple structure, is easy to install, and is economical and practical.

[0012] 3. Compared with the prior art, the utility model directly eliminates dust in the main pipe to prevent dust from flying. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structure diagram of the utility model.

[0014] The figure marks in the drawings of the specification include: markings in the figure: main pipe 1, flange 2, butterfly valve 3, high-pressure straight pipe 4, blind plate 5, short pipe 6, rubber gasket 7, bolt 8, drill hole 9, drill rod 10. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Embodiment 1:

[0017] Coal mine drilling blowout prevention structure, such as Figure 1 As shown, it includes a main pipe 1, the axis of the main pipe 1 is arranged in the horizontal direction, the main pipe 1 is a 6-inch pipe, the left end of the main pipe 1 is connected to a 4-inch flange 2 through a 4-inch pipe, the flange 2 at the left end of the main pipe 1 is connected to a blind plate 5 that closes the left end of the main pipe 1 through a bolt 8, the blind plate 5 is provided with a through hole that allows a drill rod 10 to pass through, the drill rod 10 is slidably sealed and connected to the through hole, and the through hole is coaxially arranged with the main pipe 1; the right end of the main pipe 1 is connected to a 4-inch flange 2 through a 4-inch pipe, the right end of the flange 2 at the right end of the main pipe 1 is connected to a 4-inch short pipe 6, the left end of the short pipe 6 is provided with another 4-inch flange 2, the two flanges 2 at the right end of the main pipe 1 are fixed by bolts 8, and the connection of the two flanges 2 at the right end of the main pipe 1 A rubber pad 7 is arranged in the middle to play a sealing role; the diameter of the right end of the short pipe 6 gradually decreases to a truncated cone shape, and the short pipe 6 can extend into the borehole 9. The outer periphery of the short pipe 6 plugs and seals the mouth of the borehole 9. The inner diameter of the short pipe 6 is larger than the outer diameter of the drill rod 10, so that the drill rod 10 can pass through the short pipe 6; the top of the main pipe 1 is connected to a 4-inch flange 2 through a 4-inch pipe, and the upper end of the flange 2 at the top of the main pipe 1 is fixed with a butterfly valve 3 through bolts 8. The top of the main pipe 1 is connected to a high-pressure straight pipe 4 arranged along the vertical direction, and the inner diameter of the high-pressure straight pipe 4 is 19mm. The high-pressure straight pipe 4 is connected to a water source. During the drilling process, it is used to wet the drill cuttings to prevent dust from flying and play a dust elimination role. The bottom of the main pipe 1 is connected to a 4-inch flange 2 through a 4-inch pipe, and the lower end of the flange 2 at the bottom of the main pipe 1 is fixed with a butterfly valve 3 through bolts 8.

[0018] During the drilling process, the short pipe 6 is placed inside the borehole 9 and the mouth of the borehole 9 is sealed. The drill rod 10 passes through the through hole on the blind plate 5, the main pipe 1 and the short pipe 6 from left to right and enters the borehole 9. The butterfly valve 3 at the upper end of the blowout prevention hole is connected to the gas extraction pipe and is in an open state. The gas is extracted while drilling with negative pressure. During the drilling process, the blowout prevention structure is fixed at the mouth of the borehole 9. During normal drilling, the lower end butterfly valve 3 is opened to discharge drill cuttings into the tunnel. When a blowout hole is found, drilling is stopped in time and the lower end butterfly valve 3 is closed. A sealed independent space is formed inside the blowout prevention mechanism, allowing the gas extraction pipe to extract the gas ejected from the borehole 9 under negative pressure.

[0019] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present utility model, which should be included in the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims

1. Coal mine drilling blowout prevention structure, characterized by: The invention comprises a main pipe, one end of which is flange-connected with a blind plate closing one end of the main pipe, the blind plate is provided with a through hole allowing a drill rod to pass through, and the through hole is coaxially arranged with the main pipe; the other end of the main pipe is flange-connected with a short pipe which can be sealed and connected to the borehole mouth and allows the drill rod to pass through; the top flange of the main pipe is flange-connected with a butterfly valve, the top of the main pipe is connected with a high-pressure straight-through pipe, and the bottom flange of the main pipe is flange-connected with another butterfly valve.

2. The coal mine drilling blowout prevention structure according to claim 1, characterized in that: The main pipe is a 6-inch pipe, the flange is a 4-inch flange, and the short pipe is a 4-inch pipe.

3. The coal mine drilling blowout prevention structure according to claim 1, characterized in that: A rubber pad is arranged in the middle of the flange connection where the main pipe is connected to the short pipe.

4. The coal mine drilling blowout prevention structure according to claim 1, characterized in that: The inner diameter of the high-pressure straight-through pipe is 18-20 mm.

5. The coal mine drilling blowout prevention structure according to claim 1, characterized in that: The diameter of the end of the short pipe away from the main pipe gradually decreases to be in a frustum shape.

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