CN212428923U - Gas drainage device is adjusted to portable negative pressure of full hole section - Google Patents
Gas drainage device is adjusted to portable negative pressure of full hole section Download PDFInfo
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- CN212428923U CN212428923U CN202020934539.5U CN202020934539U CN212428923U CN 212428923 U CN212428923 U CN 212428923U CN 202020934539 U CN202020934539 U CN 202020934539U CN 212428923 U CN212428923 U CN 212428923U
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Abstract
The utility model is suitable for a mine drilling gas takes out and adopts technical field, disclose a full hole section portable negative pressure regulation gas drainage device and take out and adopt the method, take out and adopt the device and include high-pressure hose support, screen pipe, hole sealing pipe, high-pressure hose, capstan winch, negative pressure adjusting device and explosion-proof machine, through threaded connection and send into the hole bottom between the screen pipe, the drill way one side and the hole sealing pipe threaded connection of screen pipe, the drill way one side of hole sealing pipe inserts the high-pressure hose into the screen pipe through the flange, sealing connection between high-pressure hose and the flange; the other end of the high-pressure hose is wound on a winch, and the winch is driven by an explosion-proof motor; at the hole opening, the negative pressure adjusting device is respectively connected with the sieve tube, the high-pressure hose and the roadway extraction pipeline, and small detection holes are formed in the front ends of the sieve tube and the high-pressure hose, which enter the negative pressure adjusting device. The utility model discloses change single fixed negative pressure drainage mode into portable, adjustable, the drainage mode of full hole section, make the drilling median flow field take place the fundamental change, effectively improve drilling gas drainage efficiency.
Description
Technical Field
The utility model relates to a gas drainage device and drainage method are adjusted to portable negative pressure of full hole section is applicable to the mine drilling gas and takes out technical field. Particularly, aiming at the common problems of low sealing good flow and low sealing poor concentration of a gas extraction drill hole, the purpose of efficiently extracting gas is achieved by changing the state of a flow field in the traditional drill hole.
Background
At present, the mine gas control and utilization in China are mainly realized by two technical ways of pressure relief gas extraction and coal seam gas pre-extraction. The coal bed gas pre-drainage drilling hole has the advantages of large construction quantity, low extraction efficiency, poor effect, long outburst elimination and standard reaching period, and seriously restricts the safe and efficient production of coal and gas outburst mines and high gas mines. Particularly, the problem of gas pre-pumping of a coal seam with low air permeability and difficult pumping is more prominent, and the problem is troubled by the technical bottleneck of low sealing good flow and low sealing poor concentration for a long time, which is the main reason of the existence of a large amount of low-concentration gas in coal mines in China. The problem of safe transportation and low utilization efficiency of low-concentration gas exist. Due to poor gas extraction effect and long outburst elimination and standard reaching period, the coal mine excavation connection is tense, and great pressure is brought to the safety production and comprehensive economic benefit of enterprises. According to the traditional gas extraction device and method, the negative pressure acting on the drill hole is single-point, namely the negative pressure in the extraction system is loaded to the hole opening or the hole bottom, and extraction energy is transmitted to the drill hole through the hole opening or the hole bottom. Because the negative pressure loading point is fixed and invariable, when the negative pressure at the orifice or the bottom of the orifice is constant, the negative pressure at each point in the drill hole is relatively invariable or rarely changed, which causes the sections with high gas content, good hole crack development and good air permeability in the drill hole and insufficient energy transfer; and for the sections with low gas content, undeveloped pore cracks and poor air permeability, the energy transmitted by negative pressure is lost inefficiently. The main reason for poor extraction effect of the traditional gas extraction mode is that the gas extraction mode is simple and easy to operate. Research shows that in an ideal state, the hole sealing effect of the drill hole is better, the farther the drill hole is from a negative pressure loading position, the greater the pressure difference loss is, and the flow is small although the gas concentration is high; the hole sealing effect of the drill hole is poor, the negative pressure energy transmission is mainly concentrated near the hole opening, and although the flow is large, the gas concentration is low. Therefore, the traditional gas extraction method cannot solve the technical problem of safe and efficient extraction of coal seam gas.
The utility model relates to a portable negative pressure of full hole section is adjusted gas and is taken out and adopt device and overcome the shortcoming of traditional gas and take out and adopt the device, take out the fixed negative pressure of drill way (or hole bottom) single-point and take out the mode and change into portable (multiple spot) of full hole section, adjustable (many negative pressures) take out and adopt the mode, make the drilling well flow field take place the radical change, can effectively improve drilling gas and take out and adopt efficiency.
Disclosure of Invention
The utility model discloses a purpose mainly is to low gas permeability, the difficult coal seam of taking out "the good flow of sealing of ubiquitous is low in this coal seam is taken out in advance, seal the technological problem of not good concentration low", overcome the shortcoming of traditional gas drainage device, change drill way (or hole bottom) fixed negative pressure drainage mode of single-point into the portable (multiple spot) of full hole section, the drainage mode of adjustable (many negative pressures), make the drilling midstream field take place the fundamental change, effectively improve drilling gas drainage efficiency, and then provide a portable negative pressure of full hole section and adjust gas drainage device and take out the method of taking out.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a full-hole-section movable negative-pressure-regulation gas extraction device comprises a high-pressure hose support, sieve pipes, hole sealing pipes, a high-pressure hose, a winch, a negative-pressure regulation device and an explosion-proof motor, wherein the sieve pipes are connected through threads and are fed into the bottom of a hole; the other end of the high-pressure hose is wound on a winch, and the winch is driven by an explosion-proof motor; and at the orifice, the negative pressure adjusting device is respectively connected with the sieve tube, the high-pressure hose and the roadway extraction pipeline, and small detection holes for detecting the orifice negative pressure and the gas concentration of the high-pressure hose and the sieve tube are arranged at the front ends of the sieve tube and the high-pressure hose entering the negative pressure adjusting device.
The negative pressure adjusting device is a handle type three-way internal thread ball valve.
The sieve tube is a general PE tube, and the inner wall of the sieve tube is provided with a guide groove for mounting a high-pressure hose support; the hole sealing pipe is made of the same material and has the same pipe diameter as the sieve pipe, and the inner wall of the hole sealing pipe is provided with the same guide groove corresponding to the sieve pipe.
The high-pressure hose is a coal mine universal high-pressure hose, and consists of an inner rubber layer, four steel wire winding layers and an outer rubber layer, and the highest working pressure resistance is 70-100 MPa.
A gas extraction method of a full-hole movable negative pressure regulation gas extraction device is characterized in that the negative pressure regulation gas extraction device moves from the bottom of a drilled hole to the direction of an orifice according to a preset moving step pitch and an extraction time interval, and an extraction point is formed by moving once; then adjusting the gas extraction concentration and flow of each extraction point to the maximum value through a negative pressure adjustment gas extraction device for extraction; after the negative pressure adjustment gas extraction device finishes one extraction cycle from the bottom of the hole to the orifice, calculating the gas flow attenuation coefficient of each extraction point in the cyclic drilling hole; calculating and determining the extraction target point of the next extraction cycle according to the gas flow attenuation coefficients of all the extraction points in the cycle; and performing circulating extraction on the determined extraction target point according to the steps until the gas extraction task of the drill hole is completed, and further realizing movable negative pressure regulation of gas extraction in the whole hole section of the drill hole.
The installation, movement and adjustment processes of the negative pressure adjustment gas extraction device are as follows:
a. after drilling and forming holes, connecting the sieve tubes in a threaded connection mode, and feeding the sieve tubes to the bottom of the holes;
b. one side of the orifice of the sieve tube is connected with the sieve tube and the hole sealing tube in a threaded connection mode;
c. sealing holes by adopting polyurethane or cement mortar;
d. a flange made of the same material is arranged on one side of an orifice at the outer end of the hole sealing pipe, the high-pressure hose is inserted into the sieve pipe through the flange, and the high-pressure hose is fixed on the high-pressure hose support; the high-pressure hose and the hole sealing pipe flange are sealed by adopting a sealing rubber sleeve, so that the high-pressure hose moves in the sieve pipe in a sealing state;
e. a bypass is arranged between one side of the orifice of the hole sealing pipe and the flange and is used for connecting the sieve pipe and the three-way ball valve;
f. the three-way ball valve is respectively connected with the sieve tube, the high-pressure hose and the roadway extraction pipeline;
g. the extraction negative pressure of the sieve tube and the high-pressure hose is adjusted by adjusting the opening of the three-way ball valve, so that the movable negative pressure adjustment of gas extraction of the whole hole section of the drilled hole is realized;
h. and moving the high-pressure hose to the direction of the orifice according to the preset moving step pitch and the extraction time interval, opening a rubber plug hole cover when the high-pressure hose moves to an extraction point, detecting the gas concentration and the gas flow of the high-pressure hose and the sieve tube, and adjusting the opening of the three-way ball valve to enable the gas concentration and the gas flow in the high-pressure hose to reach the maximum value.
The moving step pitch
And extraction time interval
The determination method of (2) is as follows:
in the formula:R ——effective radius of influence (m) of extraction borehole
t ——Drilling design pre-pumping time (d)
The gas flow attenuation coefficient of the extraction point is as follows:
in the formula:
-initial gas extraction volume (m) of a certain extraction point3/min）
And determining the extraction points with the average gas flow attenuation coefficient larger than the average gas flow attenuation coefficient as extraction target points of the drill hole, wherein the average gas flow attenuation coefficient is as follows:
The utility model has the advantages and beneficial effect:
the traditional drilling gas extraction mode is orifice (or hole bottom) single-point fixed negative pressure extraction, negative pressure in an extraction system is loaded to an orifice or a hole bottom, extraction energy is transmitted to a drill hole through the orifice or the hole bottom, and as a negative pressure loading point is fixed, when the negative pressure of the orifice or the hole bottom is fixed, the negative pressure of each point in the drill hole is relatively unchanged or changes little, so that a section with high gas content, good hole crack growth and good air permeability in the drill hole is caused, and when the energy is required to be transmitted under the negative pressure, the energy transmission is insufficient; and for the areas with low gas content, undeveloped pore cracks and poor air permeability, the energy transmitted by negative pressure is lost inefficiently, which is the main reason for poor extraction effect of the traditional gas extraction mode. The utility model has the advantages of realized that the whole hole section is portable (multiple spot), adjustable (many negative pressures) take out the drainage mode, traditional drilling negative pressure transmission energy mode has been changed, can take out the inhomogeneous characteristics of within range gas occurrence in advance to the drilling, the pore crack is inhomogeneous, coal seam permeability is inhomogeneous, the district of energy will be taken out to needs, through the inlet end that removes high-pressure hose, concentrate the ability of negative pressure transmission and load this department (target point), and accessible negative pressure adjusting device, control this department gas flow speed, make this department gas concentration and gas flow realize best coupling. In the drilling extraction period, all target points are circularly extracted, so that the extraction efficiency of drilling gas is obviously improved, the outburst elimination time and the extraction standard reaching time are greatly shortened, and the safe and efficient production of a mine is realized.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a longitudinal cross-sectional view of the hose reel (3) of FIG. 1;
the system comprises a high-pressure hose support 1, a screen pipe 2, a hole sealing pipe 3, a flange 4, a high-pressure hose 5, a winch 6, a roadway extraction pipeline 7, a small detection hole 8 (with a rubber plug hole cover), a negative pressure adjusting device 9 (a three-way ball valve) and an explosion-proof motor 10.
Detailed Description
Portable negative pressure of full hole section adjust gas and take out and adopt device be different from other colliery gas and take out and adopt negative pressure adjusting device and method, its biggest difference lies in: the utility model discloses a through the position of the downthehole negative pressure loading point of removal drilling, change drilling flow field state, reach the purpose of high-efficient taking out and exploiting. And other negative pressure adjusting devices and methods mainly aim at performing negative pressure adjustment on an extraction system or an extraction module outside a drill hole to achieve the purpose of adjusting the gas concentration or flow.
The invention is further described with reference to the following figures and examples.
The full-hole-section movable negative-pressure-adjusting gas extraction device shown in the figures 1 and 2 comprises a high-pressure hose support (1), a sieve tube (2), a hole sealing tube (3), a high-pressure hose (5), a winch (6), a three-way ball valve (9) and an explosion-proof motor (10). After the hole is drilled, the sieve tube (2) is connected in a threaded connection mode and sent to the bottom of the hole. The sieve tube (2) and the hole sealing tube (3) are made of the same material and have the same pipe diameter, and the inner wall of the sieve tube is provided with a high-pressure hose support (1) for fixing the end of a high-pressure hose. The outer end (orifice side) of the hole sealing pipe (3) inserts the high-pressure hose (5) into the sieve pipe (2) through the flange (4), and the high-pressure hose (5) and the flange (4) are sealed by a sealing rubber sleeve. The other end of the high-pressure hose (5) is wound on a winch (6), and the winch (6) is driven by an explosion-proof motor (10). And a three-way ball valve (9) for adjusting the negative pressure of the sieve tube and the high-pressure hose is connected at the orifice, and the three-way ball valve (9) is respectively connected with the sieve tube (2), the high-pressure hose (5) and the roadway extraction pipeline (7). And a detection small hole (8) (with a rubber plug hole cover) is arranged at the front end of the three-way ball valve for the sieve tube and the high-pressure hose to enter, and is used for respectively detecting the orifice negative pressure and the gas concentration from the high-pressure hose and the sieve tube. During detection, the hole cover of the detection small hole (8) (the hole cover with the rubber plug) is opened, the detection leather pipe of the gas comprehensive parameter measuring instrument is inserted into the detection small hole, the automatic detection of the negative pressure, the gas concentration and the drilling flow can be realized, and the rubber plug hole cover is sealed after the detection is finished.
The sieve tube is based on a general PE tube, a guide groove is arranged on the inner wall of the sieve tube, and the high-pressure hose support is arranged in the guide groove. The hole sealing pipe and the sieve pipe are made of the same material and have the same pipe diameter, and the inner wall of the hole sealing pipe is provided with a high-pressure hose support used for fixing the end of a high-pressure hose.
The high-pressure hose is a coal mine universal high-pressure hose, the hose is composed of an inner rubber layer, four steel wire winding layers and an outer rubber layer, and the highest working pressure resistance can reach 70-100 MPa. One end of the high-pressure hose is fixed on the high-pressure hose support, the other end of the high-pressure hose is wound on a high-pressure hose winch, the high-pressure hose winch is driven by an explosion-proof motor, and the high-pressure hose is moved in the whole hole section of the drilled hole through a forward switch and a reverse switch.
The three-way ball valve is a universal handle type three-way internal thread ball valve and is a valve capable of shunting or mixing the flow direction of a medium. The three-way ball valve is made of stainless steel, and can enable three channels to be communicated with each other or two of the channels to be communicated with each other by adopting two valve seat structures. The opening of the ball valve is adjusted through the handle, so that the extraction negative pressure of the high-pressure hose and the sieve tube is adjusted.
The installation and extraction method of the device comprises the following steps:
after the hole is drilled, the sieve tube is connected in a threaded connection mode and sent to the bottom of the hole.
The outer end (the orifice side) of the sieve tube is connected with the hole sealing tube by adopting a threaded connection mode. The length of the hole sealing pipe is 9-10 m, the sieve pipe and the hole sealing pipe are made of the same material and have the same pipe diameter, and a high-pressure hose support used for fixing the end of a high-pressure hose is arranged on the inner wall of the hole sealing pipe.
Sealing holes by adopting polyurethane or cement mortar, wherein the sealing hole depth is 8 m.
The outer end (one side of the hole) of the hole sealing pipe inserts the high-pressure hose) into the sieve pipe through a flange, and the high-pressure hose is fixed on the high-pressure hose support. The high-pressure hose and the flange are sealed by a sealing rubber sleeve. The other end of the high-pressure hose is wound on a winch, and the winch is driven by an explosion-proof motor to realize the movement of the full-hole section in the sieve tube.
And a three-way ball valve for adjusting the negative pressure of the sieve tube and the high-pressure hose is connected at the orifice. A bypass is arranged between the outer end (one side of the orifice) of the hole sealing pipe and the flange and is used for connecting the sieve pipe and the three-way ball valve; the three-way ball valve is respectively connected with the sieve tube, the high-pressure hose and the roadway extraction pipeline. And the front ends of the sieve tube and the high-pressure hose entering the three-way ball valve are provided with detection small holes with rubber plug hole covers) for respectively detecting the orifice negative pressure and the gas concentration from the high-pressure hose and the sieve tube. The movable negative pressure adjustment of the whole hole section of the drilled hole is realized by adjusting the opening of the three-way valve.
According to the drilling holeCalculating the pre-pumping time (t) And effective radius of influence of extraction borehole: (R) Determining the moving step pitch and the extraction time interval of the high-pressure hose in the drill hole;
in the formula:R ——effective radius of influence (m) of extraction borehole
t ——Drilling design pre-pumping time (sky)
And opening an explosion-proof motor switch, placing the high-pressure hose at the bottom of the full-hole sieve tube, opening a rubber plug with a detection small hole, detecting the gas concentration and flow of the high-pressure hose and the sieve tube, and adjusting the opening of the three-way ball valve to enable the gas concentration and flow in the high-pressure hose to reach the maximum value.
And moving the high-pressure hose to the orifice direction according to the moving step pitch and the extraction time interval of the high-pressure hose. And opening the rubber plug of the detection small hole every time the high-pressure hose moves (one extraction point), detecting the gas concentration and flow of the high-pressure hose and the sieve tube, and adjusting the opening of the three-way ball valve to enable the gas concentration and flow in the high-pressure hose to reach the maximum value.
And after the high-pressure hose finishes the first extraction circulation from the bottom of the hole to the orifice according to the moving step pitch and the moving time interval, calculating the gas flow attenuation coefficient of each extraction point in the drill hole.
In the formula:
-initial gas extraction volume (m) of a certain extraction point3/min）
Determining a drilling extraction target point, wherein the gas flow attenuation coefficient of the drilling extraction target point is calculated according to the following formula:
in the formula:
-attenuation coefficient of gas flow at certain extraction point (d)-1）
And determining the extraction points with the gas flow attenuation coefficient larger than the average gas flow attenuation coefficient as the extraction target points of the drill hole. And circularly extracting the extraction target point until the gas extraction task of the drill hole is completed.
Claims (4)
1. A full-hole-section movable negative-pressure-regulated gas extraction device is characterized by comprising a high-pressure hose support (1), a sieve tube (2), a hole sealing tube (3), a high-pressure hose (5), a winch (6), a negative-pressure regulating device (9) and an explosion-proof motor (10), wherein the sieve tube (2) is connected with the bottom of a hole through threads, one side of an orifice of the sieve tube (2) is connected with the hole sealing tube (3) through the threads, the high-pressure hose (5) is inserted into the sieve tube (2) through a flange (4) on one side of the orifice of the hole sealing tube (3), the high-pressure hose (5) is fixed on the high-pressure hose support (1), and the high-pressure hose (5) is connected with the flange (4) in a sealing; the other end of the high-pressure hose (5) is wound on a winch (6), and the winch (6) is driven by an explosion-proof motor (10); and at the orifice, the negative pressure adjusting device (9) is respectively connected with the sieve tube (2), the high-pressure hose (5) and the roadway extraction pipeline (7), and a detection small hole (8) for detecting the orifice negative pressure and the gas concentration of the high-pressure hose (5) and the sieve tube (2) is arranged at the front end of the sieve tube (2) and the front end of the high-pressure hose (5) entering the negative pressure adjusting device (9).
2. The full-hole-section movable negative-pressure regulation gas extraction device according to claim 1, wherein the negative-pressure regulation device (9) is a handle type three-way internal thread ball valve.
3. The full-hole-section movable negative pressure regulation gas extraction device according to claim 1, wherein the sieve tube (2) is a general PE tube, and a guide groove for mounting the high-pressure hose support (1) is formed in the inner wall of the sieve tube (2); the hole sealing pipe (3) is made of the same material and has the same pipe diameter as the sieve pipe (2), and the inner wall of the hole sealing pipe (3) is provided with the same guide groove corresponding to the sieve pipe (2).
4. The full-hole-section movable negative-pressure regulation gas extraction device according to claim 1, wherein the high-pressure hose (5) is a coal mine general-purpose high-pressure hose, the hose is composed of an inner rubber layer, four steel wire winding layers and an outer rubber layer, and the highest working pressure resistance is 70-100 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020934539.5U CN212428923U (en) | 2020-05-28 | 2020-05-28 | Gas drainage device is adjusted to portable negative pressure of full hole section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020934539.5U CN212428923U (en) | 2020-05-28 | 2020-05-28 | Gas drainage device is adjusted to portable negative pressure of full hole section |
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| Publication Number | Publication Date |
|---|---|
| CN212428923U true CN212428923U (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020934539.5U Expired - Fee Related CN212428923U (en) | 2020-05-28 | 2020-05-28 | Gas drainage device is adjusted to portable negative pressure of full hole section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212428923U (en) |
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2020
- 2020-05-28 CN CN202020934539.5U patent/CN212428923U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210129 |
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| CF01 | Termination of patent right due to non-payment of annual fee |