CN110145358B - Multi-cavity sectional type down gas extraction drilling and drainage device and method - Google Patents
Multi-cavity sectional type down gas extraction drilling and drainage device and method Download PDFInfo
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- CN110145358B CN110145358B CN201910474474.2A CN201910474474A CN110145358B CN 110145358 B CN110145358 B CN 110145358B CN 201910474474 A CN201910474474 A CN 201910474474A CN 110145358 B CN110145358 B CN 110145358B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention provides a multi-cavity sectional type down-going gas extraction drilling drainage device and a method, which relate to the technical field of gas extraction, and the device comprises a plurality of sectional cavities, a gas injection pipe, a water guide pipe and a ball float valve, wherein each sectional cavity comprises a connecting pipe and a sectional clapboard; when gas is drilled and drained, the device is placed in a drill hole, water is injected into a hole bottom sectional cavity through a gas injection pipe to open a floating ball valve, accumulated water in the drill hole enters the hole bottom sectional cavity and an upper sectional cavity through a filter screen and the floating ball valve, gas is injected into the hole bottom sectional cavity through the gas injection pipe, and the floating ball valve is closed; and continuously injecting gas, discharging the water in the segmented cavity upwards section by section along the water guide pipe, and repeating the operation after the water is discharged. The device and the method solve the technical problem of the accumulated water in the downward gas extraction borehole, and have the advantages of simple and convenient operation and the like.
Description
Technical Field
The invention relates to the technical field of gas extraction, in particular to a multi-cavity sectional type drainage device applied to a downlink gas extraction drill hole and a method for draining the gas extraction drill hole by using the device.
Background
Coal is taken as an important mining resource, as the mining depth of a coal seam is increased, the gas pressure and the gas content of the coal seam are gradually increased, gas disasters are more serious, and the safe and efficient development of a mine is threatened; meanwhile, the gas is used as a clean resource, the application is wide after industrial production, and the gas extraction is beneficial to realizing high efficiency, energy conservation and emission reduction. Around the gas disaster in the pit, the gas management policy of 'extracting first and then extracting, monitoring and controlling, and setting production with wind' is usually adopted at present; at present, coal bed gas extraction is implemented in coal and gas outburst and high gas mines underground, but in the construction process of downward gas extraction drilling, a large amount of water is often accumulated in holes due to a hydraulic slag-off process or a water-bearing stratum, the gas migration channels are blocked by the accumulated water in the holes, the extraction resistance is increased, and the gas extraction effect is poor. For a method for draining water from a drill hole by downward gas extraction, a compressed air drainage measure is usually adopted, but the drainage depth of the technology is limited, and deep hole drainage cannot be realized. In order to realize effective drainage of a deep-hole downward gas extraction borehole and improve the gas extraction effect, the conventional gas extraction borehole drainage device and method need to be further improved.
Disclosure of Invention
In order to solve the technical problem of effective drainage of a gas extraction drill hole with a long downward drill hole, the invention provides a multi-cavity sectional type downward gas extraction drill hole drainage device and method, and the specific technical scheme is as follows.
The utility model provides a downlink gas drainage drilling drainage device of multicavity sectional type, includes a plurality of segmentation cavities, gas injection pipe, aqueduct and ball-cock assembly, and the segmentation cavity includes connecting pipe and segmentation baffle, and a plurality of segmentation cavities connect gradually, and the aqueduct communicates adjacent segmentation cavity, and gas injection pipe intercommunication hole bottom segmentation cavity still is provided with ball-cock assembly and filter screen in the hole bottom segmentation cavity.
Preferably, the connecting pipes are connected through threads of the externally sleeved threaded clamp, and the connecting pipes and the segmented partition plates of each segmented chamber are fixed in a sealing mode.
Preferably, the length of the connecting pipe of the segmented chamber is sequentially increased from the bottom of the hole to the outside of the hole, the lower end of the water guide pipe extends to the bottom of the lower segmented chamber, and the upper end of the water guide pipe extends to the upper part of the upper segmented chamber.
Preferably, the ball float valve comprises a float, a gravity plate, a spring and a valve plate, wherein the spring is arranged between the valve plate and the gravity plate, and the float and the valve plate are fixed through a connecting rope; the filter screen sets up in valve plate below.
It is also preferable that the gas injection pipe is provided with a water inlet and a gas inlet, and the water inlet is provided with a water sealing device.
It is also preferred that a suction pipe is arranged in the orifice of the segment chamber and the segment chamber, and the suction pipe is connected with a suction pump.
Further preferably, the length of the segmented chamber is 6-10 m.
A multi-cavity sectional type downlink gas extraction drilling and drainage method utilizes the multi-cavity sectional type downlink gas extraction drilling and drainage device, and comprises the following steps:
step A, assembling from a hole bottom segmented chamber, and putting the assembled segmented chamber into a downward gas extraction drill hole segment by segment;
b, injecting water into the hole bottom segmented cavity through a gas injection pipe, driving a valve plate to open by a buoy, and enabling accumulated water in the drill hole to enter the hole bottom segmented cavity until the water level in the multi-cavity segmented downlink gas extraction drill hole drainage device is flush with the water level in the drill hole;
step C, closing a water injection port of the gas injection pipe, injecting gas into the hole bottom subsection cavity through the gas injection pipe, discharging water in the hole bottom subsection cavity, and driving the valve plate to close by the spring;
d, continuously injecting gas, wherein the gas enters the last subsection chamber connected with the hole bottom subsection chamber along the water guide pipe in the hole bottom subsection chamber, and the water in each subsection chamber is discharged upwards section by section;
and E, after the water in the multi-cavity sectional type downlink gas extraction drill hole drainage device is drained, repeating the steps B to D until the drainage of the gas extraction drill hole is completed.
The beneficial effects of the invention include:
(1) the multi-cavity sectional type downlink gas extraction drill hole drainage device provided by the invention is provided with the plurality of sectional cavities, the technical problem that the compressed air drainage facility cannot meet long-distance drainage in long drill hole drainage is solved through the plurality of sectional cavities, and the plurality of cavities are detachably connected so as to be convenient to disassemble, assemble and recycle.
(2) The water guide pipe of the device is connected with the segmented chamber, and the pipe end of the water guide pipe is arranged to ensure that backflow cannot occur in the gas injection and drainage process; the device is connected with the inside of the hole bottom segmented cavity through a gas injection pipe, the ball float valve is opened by water injection through buoyancy of a float, accumulated water in a hole enters the segmented cavity, gas is injected into the device, and the water segments are discharged upwards step by step through gas pressure; the hole bottom subsection cavity is also provided with a filter screen, thereby ensuring the cleanness of water in the device and preventing the pipe from being blocked.
(3) The length of the segmented chambers is preferably increased upwards in sequence, so that water is convenient to discharge, and water storage of the segmented chamber in the previous segment is better guaranteed; and the maximum length and the reasonable length of the segmented chambers are determined, stable drainage of all levels of the segmented chambers can be ensured within the range, and the installation and the use are convenient.
(4) When the device is used for draining water, the function of gradual upward drainage of water is realized through air compression and drainage in the segmented closed space, the problem of deep hole drainage in downward gas extraction of a coal seam is solved, and the defects that the drainage depth of an air compression and drainage facility is limited and deep hole drainage cannot be realized are effectively overcome. The deep hole drainage is realized by adopting the gas injection and subsection drainage principle of the closed cavity, the upward pressure-fed drilling water is divided into a plurality of sections, the drainage is more convenient, and the gas extraction effect of the downward drilling of the coal bed is further improved.
Drawings
FIG. 1 is a schematic structural diagram of a multi-cavity sectional type descending gas extraction borehole drainage device;
FIG. 2 is a schematic view of a bottom-of-hole segmented chamber and its internal structure;
FIG. 3 is a schematic cross-sectional view;
FIG. 4 is a schematic structural view of a multi-cavity segmented type downward gas extraction borehole drainage device in example 2;
in the figure: 1-a segmented chamber; 11-a well bottom segmented chamber; 12-an orifice segment chamber; 13-a connecting tube; 14-a segmented partition; 2-a gas injection pipe; 21-a water inlet; 22-an air inlet; 23-water seal device; 24-an electrically operated valve; 3-a water conduit; 4-a ball float valve; 41-floating; 42-gravity plate; 43-a spring; 44-a valve plate; 5, filtering the filter screen; 6-a thread clamp; 7-water pump.
Detailed Description
Referring to fig. 1 to 4, the multi-cavity segmented downward gas extraction borehole drainage device and method provided by the invention have the following specific embodiments.
Example 1
A multi-cavity sectional type downlink gas extraction drilling and drainage device comprises a plurality of sectional cavities 1, a gas injection pipe 2, a water guide pipe 3 and a ball float valve 4. The plurality of segmented chambers 1 divide the descending long drill hole into a plurality of stages, and the distance of each stage is respectively injected with gas for drainage, so that the gas injection pressure does not need to be very large to meet the requirement. The segmented cavity 1 comprises a connecting pipe 13 and segmented partition plates 14, the segmented cavities 1 are sequentially connected, the water guide pipe 3 is communicated with the adjacent segmented cavities 1, the gas injection pipe 2 is communicated with the hole bottom segmented cavity 1, and a ball float valve 4 and a filter screen 5 are further arranged in the hole bottom segmented cavity 1. The device is provided with a plurality of segmentation cavities 1, has solved through a plurality of segmentation cavities 1 that the forced draught drainage facility that long drilling drainage met can't satisfy the technical problem of long distance drainage, thereby a plurality of cavities can be dismantled and connect and make things convenient for dismouting and reuse.
The connecting pipes 13 are connected through the threads of the outer sleeve thread clamp 6, and the connecting pipes 13 and the sectional partition plates 14 of each sectional chamber 1 are fixed in a sealing mode. The length of segmentation cavity 1 is 6 ~ 10m, and the connecting pipe length of segmentation cavity 1 can increase in proper order outside the hole from the hole bottom, and the lower extreme of aqueduct 3 extends down the bottom of segmentation cavity 1, and the upper end of aqueduct 3 stretches to the upper portion of segmentation cavity 1. The float valve 4 comprises a float 41, a gravity plate 42, a spring 43 and a valve plate 44, the spring 43 is arranged between the valve plate 44 and the gravity plate 42, the float 41 and the valve plate 44 are fixed through a connecting rope, and the filter screen 5 is arranged below the valve plate 44. The gas injection pipe 2 is provided with a water inlet 21 and a gas inlet 22, and the water inlet 22 is provided with a water sealing device. A water pumping pipe is arranged in the orifice subsection chamber 12 of the subsection chamber 1 and is connected with a water pumping pump 7.
The water guide pipe 3 is respectively connected with each subsection cavity, and the pipe end arrangement of the water guide pipe 3 ensures that backflow cannot occur in the gas injection and drainage process; the water injection pipe 2 is connected with the inside of the hole bottom segmented cavity 11, the ball float valve 4 is opened by water injection through buoyancy of a float, accumulated water in a hole enters the segmented cavity 1, the device is injected with gas, and the water segments are discharged upwards step by step through gas pressure; the hole bottom subsection cavity 11 is also provided with a filter screen 5, thereby ensuring the cleanness of water in the device and preventing pipe blockage. The length of the segmented chambers 1 can be sequentially increased upwards, so that water is convenient to discharge, and water storage of the segmented chambers in the previous segment is better guaranteed; and the maximum length and the reasonable length of the segmented chamber 1 are determined, stable drainage of all levels of segmented chambers can be ensured within the range, and the installation and the use are convenient.
A multi-cavity sectional type downlink gas extraction drilling and drainage method utilizes the multi-cavity sectional type downlink gas extraction drilling and drainage device, and comprises the following steps:
and step A, assembling from the hole bottom segmented chamber 11, and putting the assembled segmented chambers 1 into a downward gas extraction drill hole section by section.
And step B, injecting water into the hole bottom segmented chamber 11 through the gas injection pipe 2, driving the valve plate 44 to be opened by the float 41, and enabling the accumulated water in the drill hole to enter the hole bottom segmented chamber 11 until the water level in the multi-cavity segmented downlink gas extraction drill hole drainage device is flush with the water level in the drill hole.
And step C, closing the water injection port 21 of the gas injection pipe 2, injecting gas into the hole bottom segmented cavity through the gas injection pipe 2, discharging water in the hole bottom segmented cavity 11, and driving the valve plate 44 to close by the spring 43.
And D, continuously injecting gas, wherein the gas enters the last subsection chamber connected with the hole bottom subsection chamber 11 along the water guide pipe 3 in the hole bottom subsection chamber 11, and the water in each subsection chamber 1 is upwards discharged section by section.
And E, after the water in the multi-cavity sectional type downlink gas extraction drill hole drainage device is drained, repeating the steps B to D until the drainage of the gas extraction drill hole is completed.
According to the method, the step-by-step water discharging function is realized through air compression and water discharge in the segmented closed space, the problem of deep hole water discharging of downward gas extraction under the coal seam is solved, and the defects that the drainage depth of an air compression and water discharging facility is limited and deep hole water discharging cannot be realized are effectively overcome. The deep hole drainage is realized by adopting the gas injection and subsection drainage principle of the closed cavity, the upward pressure-fed drilling water is divided into a plurality of sections, the drainage is more convenient, and the gas extraction effect of the downward drilling of the coal bed is further improved.
Example 2
The specific structure of the multi-cavity sectional type downlink gas extraction drilling drainage device comprises a plurality of sectional cavities 1, a gas injection pipe 2, a water guide pipe 3 and a ball float valve 4. The gas extraction drill hole is arranged in a downlink mode, the vertical or inclined downward drilling is achieved, the plurality of segmented cavities 1 divide the downlink long drill hole into a plurality of stages, each segmented cavity 1 comprises a connecting pipe 13 and a segmented partition plate 14, the segmented cavities 1 are connected in sequence, and therefore the water guide pipe 3 is communicated with each adjacent segmented cavity 1, the gas injection pipe is connected with the segmented cavity 11 at the bottom of the through hole 2, a ball float valve 4 and a filter screen 5 are further arranged in the segmented cavity 11 at the bottom of the hole and used for controlling water inflow in the device and preventing blockage of the device.
Specifically, the connecting pipes 13 of the segmented chambers 1 are in threaded connection through the outer sleeve threaded clamp 6, external threads are arranged at two ends of each connecting pipe 13, the pipe diameters of the connecting pipes 13 are equal, and the connecting pipes 13 and the segmented partition plates 14 of the segmented chambers are fixed in a sealing mode and can be integrally manufactured. The length of the segmented chamber 1 is about 6-10 m, through underground drainage experience, under the conditions of the existing drainage drilling diameter and the like, the optimal drainage length is obtained when each segment is about 6m, at the moment, too large air pressure is not needed for drainage, and the control and the installation are convenient; when the length of each section is more than 10m, the drainage capacity of the equipment is reduced, and the design can be adjusted according to specific conditions under special geological conditions and construction conditions. The length of the connecting pipe 13 of the segmented chamber can be sequentially increased from the bottom of the hole to the outside of the hole, so that water can be conveniently discharged, and water stored in the upper segmented chamber 1 can be better guaranteed.
The lower end of the water guide pipe 3 extends to the bottom of the lower subsection cavity 1, a funnel-shaped water suction port can be arranged at the lower end of the water guide pipe for better water absorption, the upper end of the water guide pipe 3 extends to the upper part of the upper subsection cavity 1, and the function of subsection-by-subsection water drainage is integrally realized through the combined structure device of the water guide pipe 3. In addition, the ball float valve 4 arranged on the hole bottom segmented cavity 11 comprises a float 41, a gravity plate 42, a spring 43 and a valve plate 44, the gravity plate 42 is fixed inside the segmented cavity, the spring 43 is arranged above the valve plate 44 between the valve plate 44 and the gravity plate 42, the float 41 and the valve plate 44 are fixed through a connecting rope, and the filter screen 5 is arranged below the valve plate 44. The gas injection pipe 2 is provided with a water inlet 21 and a gas inlet 22, the water inlet 21 is used for early stage water injection, the gas inlet 22 is further provided with an electric valve 24, the gas inlet 21 is used for injecting gas into the device for draining water, and the water seal device 23 can be arranged at the water inlet 21, so that water injection is facilitated, and air leakage can be avoided during gas injection. The port of the segmented chamber 1 and the segmented chamber 12 may be provided with a suction pipe, i.e. the uppermost segmented chamber of the device is through which water is discharged, which is connected to a suction pump 7. The gas inlet of the hole bottom segmented chamber 11 is arranged at the upper part of the connecting pipe 13 at the joint of the gas injection pipe 2 and the hole bottom segmented chamber 11, so that the air can be ensured to enter from the upper part and can not directly enter the water guide pipe. The water guide pipe 3 penetrates through the position of the sectional partition plate, and a water stop plug is arranged to ensure the sealing property between the water guide pipe 3 and the sectional partition plate 14.
A multi-cavity sectional type downlink gas extraction drilling and drainage method utilizes the multi-cavity sectional type downlink gas extraction drilling and drainage device, and comprises the following steps:
and step A, assembling from the hole bottom segmented chambers 11, butting the threaded hoops 6 with the segmented chambers 1 to ensure the water guide capability of the water guide pipes 3 among the segmented chambers 1, sealing, and putting the assembled segmented chambers 1 into a downward gas extraction drill hole section by section.
And step B, injecting water into the hole bottom segmented cavity 11 through the gas injection pipe 2, wherein the water injection volume is slightly smaller than the volume of the hole bottom segmented cavity, the valve plate is driven by the buoy to be opened, and the accumulated water in the drill hole enters the hole bottom segmented cavity 11 until the water level in the multi-cavity segmented downlink gas extraction drill hole drainage device is flush with the water level in the drill hole.
And step C, closing the water injection port 21 of the gas injection pipe, injecting gas into the hole bottom segmented cavity through the gas injection pipe 2, discharging water in the hole bottom segmented cavity 11, and driving the valve plate 44 to close by the spring 43.
And D, continuously injecting gas, wherein the gas enters the last subsection cavity connected with the hole bottom subsection cavity 11 along the water guide pipe in the hole bottom subsection cavity 11, and the water in each subsection cavity is discharged upwards section by section.
And E, after the water in the multi-cavity sectional type downlink gas extraction drill hole drainage device is drained, repeating the steps B to D until the drainage of the gas extraction drill hole is completed.
According to the method, the step-by-step water discharging function is realized through air compression and water discharge in the segmented closed space, the problem of deep hole water discharging of downward gas extraction under the coal seam is solved, and the defects that the drainage depth of an air compression and water discharging facility is limited and deep hole water discharging cannot be realized are effectively overcome. The deep hole drainage is realized by adopting the gas injection and subsection drainage principle of the closed cavity, the upward pressure-fed drilling water is divided into a plurality of sections, the drainage is more convenient, and the gas extraction effect of the downward drilling of the coal bed is further improved.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A multi-cavity sectional type downlink gas extraction drilling drainage method utilizes a multi-cavity sectional type downlink gas extraction drilling drainage device, and comprises a plurality of sectional cavities, a gas injection pipe, a water guide pipe and a ball float valve, wherein each sectional cavity comprises a connecting pipe and a sectional partition plate, the plurality of sectional cavities are sequentially connected, the water guide pipe is communicated with the adjacent sectional cavities, the gas injection pipe is communicated with a hole bottom sectional cavity, and the ball float valve and a filter screen are further arranged in the hole bottom sectional cavity; the method comprises the following steps:
step A, assembling from a hole bottom segmented chamber, and putting the assembled segmented chamber into a downward gas extraction drill hole segment by segment;
b, injecting water into the hole bottom segmented cavity through a gas injection pipe, driving a valve plate to open by a buoy, and enabling accumulated water in the drill hole to enter the hole bottom segmented cavity until the water level in the multi-cavity segmented downlink gas extraction drill hole drainage device is flush with the water level in the drill hole;
step C, closing a water injection port of the gas injection pipe, injecting gas into the hole bottom subsection cavity through the gas injection pipe, discharging water in the hole bottom subsection cavity, and driving the valve plate to close by the spring;
d, continuously injecting gas, wherein the gas enters the last subsection chamber connected with the hole bottom subsection chamber along the water guide pipe in the hole bottom subsection chamber, and the water in each subsection chamber is discharged upwards section by section;
and E, after the water in the multi-cavity sectional type downlink gas extraction drill hole drainage device is drained, repeating the steps B to D until the drainage of the gas extraction drill hole is completed.
2. The method for draining the multi-cavity segmented downward gas extraction borehole according to claim 1, wherein the connecting pipes are in threaded connection through an outer sleeve threaded hoop, and the connecting pipes and the segmented partition plates of each segmented cavity are hermetically fixed.
3. The multi-cavity segmented downward gas extraction borehole drainage method according to claim 1, wherein the length of the connecting pipe of the segmented chamber is sequentially increased from the bottom of the hole to the outside of the hole, the lower end of the water conduit extends to the bottom of the lower segmented chamber, and the upper end of the water conduit extends to the upper part of the upper segmented chamber.
4. The multi-cavity segmented downward gas extraction borehole drainage method according to claim 1, wherein the ball float valve comprises a float, a gravity plate, a spring and a valve plate, the spring is arranged between the valve plate and the gravity plate, and the float and the valve plate are fixed through a connecting rope; the filter screen sets up in valve plate below.
5. The multi-cavity segmented downward gas extraction borehole drainage method according to claim 1, wherein a water inlet and an air inlet are formed in the gas injection pipe, and a water sealing device is arranged at the water inlet.
6. The method for draining the multi-cavity segmented downward gas extraction drill hole according to claim 1, wherein a water pumping pipe is arranged in the orifice segmented chamber of the segmented chamber, and the water pumping pipe is connected with a water pumping pump.
7. The multi-cavity segmented downward gas extraction borehole drainage method according to claim 3, wherein the length of the segmented cavity is 6-10 m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1002605A1 (en) * | 1981-06-04 | 1983-03-07 | Институт проблем комплексного освоения недр АН СССР | Method of degassing coal seams being worked |
| CN202081908U (en) * | 2011-06-01 | 2011-12-21 | 焦作煤业（集团）白云煤业有限公司 | Hole sealing device for water gushing and gas drainage drilled hole |
| CN103615014B (en) * | 2013-11-29 | 2015-11-25 | 东南大学 | A kind of dewatering device of soft soil foundation pit and using method thereof |
| CN107939351B (en) * | 2016-10-12 | 2020-01-07 | 中国石油天然气股份有限公司 | Coal bed gas drainage and gas production device and using method thereof |
| CN206636601U (en) * | 2017-04-12 | 2017-11-14 | 安徽省皖北煤电集团有限责任公司 | To drilling drainage arrangement under one kind |
| CN107165672A (en) * | 2017-06-30 | 2017-09-15 | 徐州市耐力高分子科技有限公司 | A kind of descending borehole fissure water suction system of country rock |
| CN207776897U (en) * | 2017-12-12 | 2018-08-28 | 贵州盘江精煤股份有限公司 | A kind of downlink mash gas pumping drilling pressure wind self-draining arrangement |
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