Blowout prevention and diversion system for coal mine tunnel drilling

Abstract

The utility model relates to the technical field of coal mine tunnel drilling, in particular to a coal mine tunnel drilling blowout prevention flow guide system. Comprising a hole sealing pipe located in a coal seam, one end of the hole sealing pipe is connected with one end of a steel pipe, the other end of the steel pipe is fixedly communicated with a four-way joint, the first end of the four-way joint is fixedly communicated with the steel pipe, a hand valve is installed at the second end of the four-way joint, the second end of the four-way joint is communicated with a negative pressure drainage pipe, and the negative pressure drainage pipe is communicated with a negative pressure header pipe. The third end of the four-way joint is provided with a manual blowout preventer, the fourth end of the four-way joint is fixedly communicated with a fluid return pipe, the fluid return pipe is communicated with the inlet end of the separation tank, the upper end of the separation tank is communicated with the negative pressure drainage pipe through a valve, and the lower end of the separation tank is sequentially communicated with the first sedimentation tank, the second sedimentation tank and the third sedimentation tank. The utility model systematically solves the problems of poor blowout prevention effect, low separation efficiency, lagging regulation and control, many potential safety hazards and the like in the traditional technology, and obviously improves the safety, environmental protection property and economical efficiency of coal mine tunnel drilling construction.

Description

TECHNICAL FIELD

[0001] The utility model relates to the coal mine roadway drilling technical field, concretely relates to the coal mine roadway drilling blowout control system. BACKGROUND

[0002] In the process of coal mine roadway drilling construction, when drilling penetrates coal seam or rock stratum, the instantaneous ejection of fluid (such as gas, coal slurry, water, etc.) in the drilling (i.e. the "drilling blowout" phenomenon) is often caused by factors such as complex geological conditions, sudden increase of gas pressure or groundwater enrichment. Such blowout not only causes deterioration of the construction environment and equipment damage, but also may cause gas overrun, coal dust explosion and other major safety accidents. Traditional blowout control technology mostly uses one-way plugging or simple drainage devices, which has the following significant defects:

[0003] Limited blowout effect: Conventional blowout control devices have insufficient sealing, especially when drilling with a dynamic drill rod, it is difficult to effectively balance the pressure difference between the inside and outside of the drilling, resulting in high-pressure fluid spattering from the gap between the drill rod and the device.

[0004] Low efficiency of flow control and separation: The returned fluid is directly discharged or simply precipitated, without realizing efficient separation of gas, liquid and solid phases, gas accumulation is easy, and coal powder particles are difficult to precipitate completely, polluting the underground environment and increasing the subsequent processing cost.

[0005] Lack of dynamic control ability: The existing system mostly relies on fixed valves or passive drainage, and cannot adjust the negative pressure drainage and flow control path in real time according to the blowout intensity, resulting in insufficient gas extraction or uncontrolled fluid backflow.

[0006] Safety warning is missing: When blowout occurs, there is a lack of quick response mechanism, and the operator is difficult to judge the abnormal situation in time, increasing the risk of sudden accidents.

[0007] In view of the above problems, it is urgent to design a blowout control system integrating dynamic sealing, multi-stage separation, negative pressure linkage and safety warning function to improve the safety and environmental protection of coal mine roadway drilling construction. UTILITY MODEL CONTENT

[0008] The main purpose of the utility model is to provide a coal mine roadway drilling blowout control system with good blowout effect and effective treatment of returned fluid.

[0009] In order to achieve the above purpose, the technical scheme provided by the utility model is:

[0010] The coal mine roadway drilling blowout prevention flow guide system comprises a hole sealing pipe located in a coal seam, one end of the hole sealing pipe is connected with one end of a steel pipe, the other end of the steel pipe extends to a coal mine roadway, one end of the steel pipe in the coal mine roadway is fixedly connected with a cross, a first end of the cross is fixedly connected with the steel pipe, a second end of the cross is located above, a hand valve is installed on the second end of the cross, the second end of the cross is connected with a negative pressure drainage pipe, the negative pressure drainage pipe is connected with a negative pressure main pipe, a third end of the cross is installed with a hand blowout preventer, the third end of the cross, the first end of the cross, the steel pipe and the hole sealing pipe are concentric, a drill rod penetrates through the hand blowout preventer, the third end of the cross, the first end of the cross, the steel pipe and the hole sealing pipe, a fourth end of the cross is fixedly connected with a fluid return pipe, the fluid return pipe is connected with an inlet end of a separation tank, the upper end of the separation tank is connected with the negative pressure drainage pipe through a valve, the lower end of the separation tank is sequentially connected with a first sediment tank, a second sediment tank and a third sediment tank.

[0011] Specifically, the hand blowout preventer and the cross are supported by the support frame.

[0012] Specifically, the first end of the cross is connected with the steel pipe through a flange.

[0013] Specifically, the hole sealing pipe is a PVC pipe, and the hole sealing pipe is fixedly connected with the steel pipe in a plug-in manner.

[0014] Specifically, a metal mesh plate is fixedly arranged in the separation tank, the metal mesh plate is located above the inlet end of the separation tank, one end of the metal mesh plate is inclined downward, and a gap is formed between the inclined one end of the metal mesh plate and the inner wall of the separation tank.

[0015] Specifically, an alarm is installed in the separation tank below the valve.

[0016] Specifically, the hand blowout preventer comprises an outer cylinder, a hole stopper is fixedly arranged in one end of the outer cylinder, an inner cylinder is threadedly connected in the outer cylinder, a rubber cylinder is arranged between the inner cylinder and the hole stopper, and the drill rod penetrates through the outer cylinder, the inner cylinder and the rubber cylinder.

[0017] Compared with the prior art, the coal mine roadway drilling blowout prevention flow guide system has the following beneficial effects:

[0018] 1. The compression degree of the rubber cylinder is adjusted by rotating the inner cylinder, so that self-adaptive sealing during dynamic drilling of the drill rod is realized. The rubber cylinder is pressed to tightly hold the drill rod, high-pressure fluid is effectively blocked from spattering from the gap between the drill rods, and the problem of insufficient sealing of the traditional device is solved. The concentric arrangement of the cross, the steel pipe, the hole sealing pipe and the drill rod, combined with the reinforcement of the support frame, ensures stable operation of the drill rod and reduces the risk of sealing failure caused by vibration.

[0019] 2、Inclined metal mesh board disperses fluid impact force through small mesh structure, promotes natural updraft of gas, and makes solid-phase particles such as coal powder slide to the tank bottom, preliminarily realizing gas-solid separation. Fluid flows through three groups of sedimentation tanks in turn, and coal cinder, coal powder and other particles are gradually precipitated, and finally the liquid-phase fluid discharged has significantly reduced solid-phase content, which can be directly reused or safely discharged, reducing environmental pollution.

[0020] 3、The communication state of the second end of the four-way valve with the negative pressure main pipe is controlled through a hand valve, and an operator can flexibly switch the drainage mode according to the jet hole strength, balance the pressure inside and outside the drilling hole, and prevent gas accumulation or fluid out of control. The alarm in the separation tank triggers a buzzing alarm through gas emission, prompting the operator to open the valve in time, and the negative pressure system is linked to drain gas.

[0021] 4、The four-way valve and the steel pipe are connected through flanges, and the hole sealing pipe and the steel pipe are fixed through insertion, which is convenient for quick disassembly and replacement of parts, and adapts to complex working conditions underground. The hole sealing pipe made of PVC is resistant to acid and alkali corrosion, prolongs the service life of the pipe, reduces the maintenance cost, and at the same time, the lightweight design simplifies the transportation and installation process underground.

[0022] 5、The four-way valve is directly connected with the negative pressure system, and harmful gases such as gas are immediately removed when the jet hole occurs, reducing the risk of explosion and poisoning. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the present application.

[0024] Figure 2 is a sectional view of the hand-operated blowout preventer.

[0025] The names of the parts in the drawings are: 1, hole sealing pipe, 2, steel pipe, 3, flange, 4, four-way valve, 5, negative pressure drainage pipe, 6, hand valve, 7, fluid return pipe, 8, hand-operated blowout preventer, 801, outer cylinder, 802, hole stop, 803, inner cylinder, 804, rubber cylinder, 9, support frame, 10, separation tank, 11, metal mesh board, 12, valve, 13, alarm, 14, first sedimentation tank, 15, second sedimentation tank, 16, third sedimentation tank, 17, drill pipe, 18, coal seam. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0027] Embodiment one: refer to Figure 1 The coal mine roadway drilling blowout control and flow guiding system shown in the drawing comprises a hole sealing pipe 1 located in a coal seam 18, one end of the hole sealing pipe 1 is connected with one end of a steel pipe 2, the other end of the steel pipe 2 extends to a coal mine roadway. The hole sealing pipe 1 is a PVC pipe, and the hole sealing pipe 1 and the steel pipe 2 are fixedly connected through insertion.

[0028] The steel pipe 2 in the coal mine tunnel has one end fixedly communicated with a cross 4, and the first end of the cross 4 is fixedly communicated with the steel pipe 2. Specifically, the first end of the cross 4 is connected with the steel pipe 2 through a flange 3.

[0029] A hand valve 6 is installed on the second end of the cross 4, the second end of the cross 4 is located at the top, the second end of the cross 4 is communicated with a negative pressure drainage pipe 5, and the negative pressure drainage pipe 5 is communicated with a negative pressure main pipe.

[0030] A hand-operated blowout preventer 8 is installed on the third end of the cross 4, and the hand-operated blowout preventer 8 and the cross 4 are supported by a support frame 9.

[0031] The fourth end of the cross 4 is fixedly communicated with a fluid return pipe 7, the fluid return pipe 7 is communicated with an inlet end of a separation tank 10, and the upper end of the separation tank 10 is communicated with the negative pressure drainage pipe 5 through a valve 12. A metal mesh plate 11 is fixedly arranged in the separation tank 10, and the metal mesh plate 11 is located above the inlet end of the separation tank 10. One end of the metal mesh plate 11 is inclined downward, and a gap is formed between the inclined one end of the metal mesh plate 11 and the inner wall of the separation tank 10.

[0032] An alarm 13 is installed in the separation tank 10 below the valve 12.

[0033] The lower end of the separation tank 10 is sequentially communicated with a first sediment tank 14, a second sediment tank 15 and a third sediment tank 16.

[0034] The hole sealing pipe 1 is connected with the steel pipe 2, thereby enhancing the strength of the pipe column. Meanwhile, the hand-operated blowout preventer 8 and the cross 4 are supported by the support frame 9, so that the cross 4 and the hand-operated blowout preventer 8 connected behind the steel pipe 2 are more stable and firm. Especially when the drill rod 17 is drilling, the stability of the cross 4 and the hand-operated blowout preventer 8 can be improved.

[0035] The third end of the cross 4, the first end of the cross 4, the steel pipe 2 and the hole sealing pipe 1 are concentric, and the drill rod 17 penetrates through the hand-operated blowout preventer 8, the third end of the cross 4, the first end of the cross 4, the steel pipe 2 and the hole sealing pipe 1.

[0036] The second end of the cross 4 is communicated with the negative pressure drainage pipe 5, the negative pressure drainage pipe 5 is communicated with the negative pressure main pipe, fluid enters the cross 4, and the dangerous gas existing in the fluid in the cross 4 can be extracted, thereby protecting the safety of the tunnel construction personnel.

[0037] The fluid entering the cross 4 enters the separation tank 10 through the fluid return pipe 7. When the gas in the fluid is discharged from the alarm 13 after the fluid enters the separation tank 10, the alarm 13 emits a loud buzzing sound similar to the whistle principle, thereby reminding the operator to open the valve 12, so that the gas in the separation tank 10 is extracted into the negative pressure drainage pipe 5.

[0038] The metal mesh plate 11 inside the separator 10 has a dense mesh of small openings, which can reduce the upward impact force of the fluid entering the separator 10 and allow the gas to escape upward.

[0039] In this embodiment, the metal mesh plate 11 is inclined downward on the right side and has a gap between it and the inner wall of the separation tank 10.

[0040] The gap allows a small amount of coal powder or other tiny solid particles to fall onto the upper end of the metal mesh plate 11 and flow back into the separator 10.

[0041] When the fluid in the separator 10, carrying coal slag, coal powder, etc., flows through the first sedimentation tank 14, the second sedimentation tank 15, and the third sedimentation tank 16, the solid particles settle under the action of gravity, which can reduce the solid particle content in the fluid discharged from the third sedimentation tank 16. Finally, the fluid discharged from the third sedimentation tank 16 can be guided to the underground return water pipeline of the coal mine.

[0042] Example 2: Based on Example 1, referring to... Figure 2 As shown, the manual blowout preventer 8 includes an outer cylinder 801, an inner cylinder 803 is fixedly attached to one end of the outer cylinder 801, and a rubber cylinder 804 is installed between the inner cylinder 803 and the inner cylinder 802. The drill rod 17 passes through the outer cylinder 801, the inner cylinder 803 and the rubber cylinder 804.

[0043] When the inner cylinder 803 is rotated and the manual blowout preventer 8 is shortened, the rubber cylinder 804 is squeezed, thereby gripping and sealing the drill rod 17 to prevent fluid from escaping from the annular cavity between the drill rod 17 and the inner cylinder 803. When the manual blowout preventer 8 is extended, the internal rubber cylinder 804 returns to its normal state under its own elastic force, releasing the drill rod 17.

[0044] By rotating the inner cylinder 803 to adjust the compression of the rubber cylinder 804, adaptive sealing is achieved during dynamic drilling of the drill rod 17. The rubber cylinder 804, under pressure, tightly grips the drill rod 17, effectively preventing high-pressure fluid from splashing out from the gap between the drill rod 17 and the inner cylinder 803, thus solving the problem of insufficient sealing in traditional devices.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blowout control and flow directing system for boreholes in coal mine roadways, comprising a hole sealing pipe (1) located in a coal seam (18), characterised in that, The sealing pipe (1) is connected with one end of the steel pipe (2), the other end of the steel pipe (2) extends to the coal mine tunnel, the steel pipe (2) in the coal mine tunnel is fixedly connected with the four-way pipe (4), the first end of the four-way pipe (4) is fixedly connected with the steel pipe (2), the second end of the four-way pipe (4) is located above, the hand valve (6) is installed on the second end of the four-way pipe (4), the second end of the four-way pipe (4) is communicated with the negative pressure drainage pipe (5), the negative pressure drainage pipe (5) is communicated with the negative pressure main pipe, the third end of the four-way pipe (4) is installed with the hand-operated blowout preventer (8), the third end of the four-way pipe (4), the first end of the four-way pipe (4), the steel pipe (2) and the sealing pipe (1) are concentric, the drill pipe (17) penetrates the hand-operated blowout preventer (8), the third end of the four-way pipe (4), the first end of the four-way pipe (4), the steel pipe (2) and the sealing pipe (1), the fourth end of the four-way pipe (4) is fixedly communicated with the fluid return pipe (7), the fluid return pipe (7) is communicated with the inlet end of the separation tank (10), the upper end of the separation tank (10) is communicated with the negative pressure drainage pipe (5) through the valve (12), the lower end of the separation tank (10) is sequentially communicated with the first sediment tank (14), the second sediment tank (15) and the third sediment tank (16).

2. The coal mine roadway drilling blowout containment flow directing system of claim 1, wherein, The hand-operated blowout preventer (8) and the four-way pipe (4) are supported by the support frame (9).

3. The coal mine roadway drilling blowout containment flow directing system of claim 1, wherein, The first end of the four-way pipe (4) is connected with the steel pipe (2) through the flange (3).

4. The coal mine roadway drilling blowout containment flow directing system of claim 1, wherein, The sealing pipe (1) is a PVC pipe, and the sealing pipe (1) is fixedly connected with the steel pipe (2) in a plug-in manner.

5. The coal mine roadway drilling blowout containment flow directing system of claim 1, wherein, The separation tank (10) is fixedly provided with a metal mesh plate (11), the metal mesh plate (11) is located above the inlet end of the separation tank (10), one end of the metal mesh plate (11) is inclined downward, and a gap is formed between the inclined one end of the metal mesh plate (11) and the inner wall of the separation tank (10).

6. The coal mine roadway drilling blowout containment flow directing system of claim 1, wherein, The alarm (13) is installed in the separation tank (10) below the valve (12).

7. The coal mine roadway drilling blowout containment flow directing system of claim 1, wherein, The hand-operated blowout preventer (8) comprises an outer cylinder (801), a hole stopper (802) is fixedly arranged in one end of the outer cylinder (801), an inner cylinder (803) is threadedly connected in the outer cylinder (801), a rubber cylinder (804) is arranged between the inner cylinder (803) and the hole stopper (802), and the drill pipe (17) penetrates the outer cylinder (801), the inner cylinder (803) and the rubber cylinder (804).

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