CN107842350B - A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine - Google Patents

A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine Download PDF

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Publication number
CN107842350B
CN107842350B CN201711083415.XA CN201711083415A CN107842350B CN 107842350 B CN107842350 B CN 107842350B CN 201711083415 A CN201711083415 A CN 201711083415A CN 107842350 B CN107842350 B CN 107842350B
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gas
pipe
pumping drilling
drilling
coal
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CN107842350A (en
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刘晓
韩颖
王利
宋红娜
李贤忠
衡帅
张帆
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Henan University of Technology
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Henan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243Combustion in situ
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine, comprising the following steps: bore mounting hole;Install and fix orifice sealing connecting pipe;Mash gas pumping drilling construction;CaC is placed in mash gas pumping drilling2;Mine pressure pipe road connects aperture sealed joint pipe part, sprays the water in mash gas pumping drilling, and orifice sealing connecting pipe is closed after the completion of jet stream;CaC in mash gas pumping drilling2It is reacted with water and generates Ca (OH)2And C2H2, a large amount of heat is generated, coal-bed gas accelerates desorption;Orifice sealing connecting pipe is connect into drainage tube, union carries out gas drainage.The present invention is promoted coal-bed gas desorption, to improve gas drainage rate, and according to seam contrast and drilling arrangement form, can be implemented using interval drilling or drilling is concentrated to implement by improving the temperature in drilling;Have the characteristics that safe and efficient, credible, project amount is small, can be widely applied and coal mine gas extraction field.

Description

A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine
Technical field
The invention belongs to coal mine gas drainage technical fields, and in particular to a kind of high gas remainder quantity coal seam of underground coal mine The method for improving extraction rate.
Background technique
The coal bed gas (gas) in China is resourceful, and 2000 m of buried depth has 3.5 × 10 with shallow coal bed gas13 m3, have huge Big potentiality to be exploited.But meanwhile the Gas Disaster based on coal and gas prominent seriously hinders always Safety of Coal Mine Production.Gas Extraction is the effective technology measure for reducing or even eliminating various Gas Disaster potential threats and efficiently using coal bed gas (gas).So And since the high gas layer gas permeability in 95% or more China is low, only 10-3~10-4MD, original and gas remainder quantity is big, This coal seam of China is caused to be averaged gas drainage rate less than 10%, there is phases compared with the average extraction rate of other advanced countries 30% When big gap].To ensure Safety of Coal Mine Production, China drug in some provinces proposes more strict requirements " remaining gas pressure And content drops to 0.6MPa and 6m3After/t or less, coal seam of being allowed for access carries out digging operation ", the efficient extraction work of coal mine gas Face huge challenge.At present mainly by coal seams " anti-reflection " technologies such as hydraulic fracturing, hydraulic flushing in hole to improve gas drainage rate, this A little methods are but difficult to decrease coal seam gas remainder quantity although can increase the permeability in coal seam.
There are two the major control factors of coal-bed gas desorption: first is that pressure, second is that temperature;Release and heating can mention The desorption efficiency of high coal-bed gas, to improve gas pumping effect, the method for improving coal bed gas extraction at present is mostly release, Even if release is to be difficult to solve high gas remainder quantity coal seam, it is also difficult to improve the extraction effect of high remaining coal seam gas-bearing capacity Rate.
Summary of the invention
The present invention provides a kind of coal strong convenient for operation, security reliability to solve shortcoming in the prior art The method that extraction rate is improved in high gas remainder quantity coal seam under mine.
In order to solve the above technical problems, the present invention adopts the following technical scheme: a kind of high gas remainder quantity of underground coal mine The method of coal seam raising extraction rate, comprising the following steps:.
(1) it bores mounting hole: in construction extraction borehole place in advance, mounting hole being bored using the drill bit not less than φ 120mm, bores peace Fill the 5~8m of depth in hole;
(2) it installs and fixes orifice sealing connecting pipe: after the completion of mounting hole drilling, orifice sealing connecting pipe being installed Into the aperture of mounting hole, then by injecting cement mortar into mounting hole in the central passage of orifice sealing connecting pipe, Cement mortar is re-filled with the annular gap between inner wall of the hole installing and orifice sealing connecting pipe outer wall by the bottom of mounting hole, Central passage until being full of entire mounting hole and orifice sealing connecting pipe, solidification is for 24 hours;
(3) mash gas pumping drilling construction: according to the length of design mash gas pumping drilling, select to use diameter for φ 42mm, φ 75mm, φ 94mm, φ 114mm and φ 120mm drill bit drill along the center line of orifice sealing connecting pipe, first by hole After the cement mortar of solidification in mouth sealed connection pipe fitting drills out, then creep into design length;
(4) CaC is placed in mash gas pumping drilling2
(5) mine pressure pipe road connects aperture sealed joint pipe part, sprays the water in mash gas pumping drilling, and jet stream is completed Orifice sealing connecting pipe is closed afterwards;
(6) CaC in mash gas pumping drilling2It is reacted with water and generates Ca (OH)2And C2H2, while a large amount of heat is generated, Under heat effect, coal-bed gas accelerates desorption, meanwhile, CaC2Incendivity is reacted with water, since there is also few in mash gas pumping drilling The air of amount, CH under the action of air, in mash gas pumping drilling4With C2H2With small-sized combustion occurs under the collective effect of air It burns or explodes, further discharge heat, further promote the desorption of coal-bed gas;When small blasting, also to mash gas pumping drilling Hole wall generate destruction, formed crack distressed zone, further increase coal-bed gas desorption efficiency;
(7) orifice sealing connecting pipe is connect into drainage tube, union carries out gas drainage;
(8) after gas drainage carries out for 24 hours, the gas density in mash gas pumping drilling is reduced to 30%, repeats step (4) ~(7).
Orifice sealing connecting pipe includes the penetrating tube body of inner and outer ends, and the outer end of tube body is coaxial to be fixedly connected with annular Mounting plate, the internal diameter of annular mounting plate are equal to the outer diameter of tube body, and annular mounting plate outer surface is connected with by fastening bolt by pipe The ring flange that external port blocks, is provided with sealed bolster plate, tube body external peripheral surface is fixed between annular mounting plate and ring flange It is provided with the annular closure plate of the external port closure of annular gap, the outer diameter of annular closure plate is greater than the internal diameter of mounting hole;
Ring flange left and right side is connected separately with the first pipe fitting and the second pipe fitting, and is provided on the first pipe fitting One valve is provided with the second valve on the second pipe fitting.
Tube body external peripheral surface is evenly arranged with several spacing block sets being located in mounting hole, between spacing block set and annular The cement mortar contact of injection in gap keeps tube body fixed in mounting hole.
Annular mounting plate lateral surface is coaxial to offer rounded seal groove, and ring flange medial surface is provided with and seal groove Corresponding sealing bulge loop, the width of rebate of seal groove are greater than the width of sealing bulge loop, seal groove and the cross section of sealing bulge loop Outer profile is in arc segment;Under the action of fastening bolt, sealing bulge loop presses sealed bolster plate into seal groove.
Step (4) detailed process are as follows: after the completion of mash gas pumping drilling construction, by sealed bolster plate be mounted on annular mounting plate and Between ring flange, ring flange, the first pipe fitting and the second pipe fitting are connected to tube body outer end using fastening bolt, open the One valve closes the second valve, by CaC2Particulate matter is put into the first pipe fitting, using mine compressed air by CaC2Particulate matter is blown into In mash gas pumping drilling, the first valve is finally closed.
Step (5) detailed process are as follows: the first pipe fitting is connect into mine pressure pipe road, opens the first valve, high-pressure water jet To mash gas pumping drilling, the first valve is closed after the completion of jet stream.
Step (7) detailed process are as follows: the first pipe fitting is connect into drainage tube, union carries out extraction preparation, uses gas management Instrument connects the second pipe fitting, opens the second valve, tests CH in mash gas pumping drilling4Gas concentration and temperature, when temperature declines To 30 DEG C or less and drill in CH4Concentration is not less than 60%, opens the first valve and carries out extraction;Otherwise, the interior temperature that drills is continued waiting for Degree decline and methane desorption, until carrying out extraction after meeting above-mentioned condition.
By adopting the above technical scheme, the orifice sealing connecting pipe in the present invention is by being arranged limit convex in tube wall Spacing block set is cast in annular gap by block, cement mortar, in this way can be fixed by tube body, in the first pipe fitting, the second pipe When connector connects various pipelines and the first valve of operation and the second valve, the stabilization for making orifice sealing connecting pipe all can ensure that Property.
During injecting cement mortar, annular closure plate, which plays, blocks annular gap, and cement mortar is avoided to let out from inside to outside The effect of dew.
The cooperation of sealing bulge loop on seal groove and ring flange on annular mounting plate, can be by the corresponding annular of sealed bolster plate Place is pressed into seal groove, can sufficiently improve sealing performance in this way.In addition, the width of rebate of seal groove is greater than sealing bulge loop The outer profile of the cross section of width, seal groove and sealing bulge loop is in arc segment, is not only easy for sealed bolster plate to be pressed into this way In seal groove, sealing bulge loop and seal groove is also avoided to damage sealed bolster plate.
This method makes full use of two factors of pressure and temperature for influencing coal-bed gas desorption, using burning and explosion, makes The wall of a borehole coal wall is broken, achievees the purpose that release, simultaneously as the heat that burning and explosion generate makes drilling and coal seam temperature liter Height accelerates conversion of the adsorption gas to free gas, improves extraction efficiency.This method can be widely applied and this coal seam concordant Hole pumping and mining and layer-through drilling extraction later period, to be difficult to extraction up to standard since coal seam gas remainder quantity passes through greatly drilling release In the case of, the desorption of high remaining gas can be effectively improved by heating, to improve the extraction efficiency of high remaining coal-bed gas. Certainly, this method can also be used under conditions of there is no high remaining coal seam gas-bearing capacity, improve the extraction efficiency of gas.
In conclusion the present invention passes through the temperature further increased in drilling, promote coal-bed gas desorption, thus raising watt This extraction rate.The present invention can be used for the different mash gas pumping drilling type of gas, along coal bed drilling or layer-through drilling, elevation angle hole or Angle of depression hole;The present invention can implement using interval drilling or concentrate drilling according to seam contrast and drilling arrangement form Implement.The present invention has the characteristics that safe and efficient, credible, project amount is small, can be widely applied and lead with coal mine gas extraction Domain.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention;
Fig. 2 is the enlarged drawing in Fig. 1 at A.
Specific embodiment
As depicted in figs. 1 and 2, the side of extraction rate is improved in a kind of high gas remainder quantity coal seam of underground coal mine of the invention Method, comprising the following steps:
(1) it bores mounting hole: in construction extraction borehole place in advance, mounting hole being bored using the drill bit not less than φ 120mm, bores peace Fill the 5~8m of depth in hole;
(2) it installs and fixes orifice sealing connecting pipe: after the completion of mounting hole drilling, orifice sealing connecting pipe being installed Into the aperture of mounting hole, cement mortar 1 is then injected into mounting hole by the central passage in orifice sealing connecting pipe, Cement mortar 1 is re-filled between the annular between inner wall of the hole installing and orifice sealing connecting pipe outer wall by the bottom of mounting hole Gap, the central passage until being full of entire mounting hole and orifice sealing connecting pipe, solidification is for 24 hours;
(3) mash gas pumping drilling 2 is constructed: according to the length of design mash gas pumping drilling 2, selecting to use diameter for φ 42mm, φ 75mm, φ 94mm, φ 114mm and φ 120mm drill bit drill along the center line of orifice sealing connecting pipe, After first the cement mortar 1 of the solidification in orifice sealing connecting pipe is drilled out, then creep into design length;
(4) CaC is placed in mash gas pumping drilling 22
(5) mine pressure pipe road connects aperture sealed joint pipe part, sprays the water in mash gas pumping drilling 2, jet stream is complete At rear closing orifice sealing connecting pipe;
(6) CaC in mash gas pumping drilling 22It is reacted with water and generates Ca (OH)2And C2H2, while a large amount of heat is generated, Under heat effect, coal-bed gas accelerates desorption, meanwhile, CaC2React incendivity with water, due in mash gas pumping drilling 2 there is also A small amount of air, CH under the action of air, in mash gas pumping drilling 24With C2H2With occur under the collective effect of air it is small-sized Burning or explosion, further discharge heat, further promote the desorption of coal-bed gas;When small blasting, also gas drainage is bored The hole wall in hole 2 generates destruction, forms crack distressed zone, further increases coal-bed gas desorption efficiency;
(7) orifice sealing connecting pipe is connect into drainage tube, union carries out gas drainage;
(8) after gas drainage carries out for 24 hours, the gas density in mash gas pumping drilling 2 is reduced to 30%, repeats step (4) ~(7).
Orifice sealing connecting pipe includes the penetrating tube body 3 of inner and outer ends, and the outer end of tube body 3 is coaxial to be fixedly connected with ring Shape mounting plate 4, the internal diameter of annular mounting plate 4 are equal to the outer diameter of tube body 3, and 4 outer surface of annular mounting plate is connected by fastening bolt 5 There is the ring flange 6 for blocking 3 external port of tube body, be provided with sealed bolster plate 7 between annular mounting plate 4 and ring flange 6, outside tube body 3 Circumferential surface is fixedly installed the annular closure plate 8 of the external port closure of annular gap, and the outer diameter of annular closure plate 8 is greater than mounting hole Internal diameter;
6 left and right side of ring flange is connected separately with the first pipe fitting 9 and the second pipe fitting 10, sets on the first pipe fitting 9 It is equipped with the first valve 11, the second valve 12 is provided on the second pipe fitting 10.
3 external peripheral surface of tube body is evenly arranged with several spacing block sets 13 being located in mounting hole, spacing block set 13 with The contact of cement mortar 1 of injection in annular gap keeps tube body 3 fixed in mounting hole.
4 lateral surface of annular mounting plate is coaxial to offer rounded seal groove, and 6 medial surface of ring flange is provided with and seals The corresponding sealing bulge loop 15 of slot 14, the width of rebate of seal groove 14 are greater than the width of sealing bulge loop 15, and seal groove 14 and sealing are convex The outer profile of the cross section of ring 15 is in arc segment;Under the action of fastening bolt 5, sealing bulge loop 15 presses sealed bolster plate 7 Into seal groove 14.
Step (4) detailed process are as follows: after the completion of mash gas pumping drilling 2 is constructed, sealed bolster plate 7 is mounted on annular mounting plate Between 4 and ring flange 6, ring flange 6, the first pipe fitting 9 and the second pipe fitting 10 are connected to outside tube body 3 using fastening bolt 5 The first valve 11 is opened in end, the second valve 12 is closed, by CaC2Particulate matter is put into the first pipe fitting 9, using mine compressed air By CaC2Particulate matter is blown into mash gas pumping drilling 2, finally closes the first valve 11.
Step (5) detailed process are as follows: the first pipe fitting 9 is connect into mine pressure pipe road, opens the first valve 11, high pressure water jets It is incident upon in mash gas pumping drilling 2, the first valve 11 is closed after the completion of jet stream.
Step (7) detailed process are as follows: the first pipe fitting 9 is connect into drainage tube, union is carried out extraction preparation, examined using gas It surveys instrument and connects the second pipe fitting 10, open the second valve 12, test CH in mash gas pumping drilling 24Gas concentration and temperature, work as temperature Degree drops to 30 DEG C or less and the interior CH that drills4Concentration is not less than 60%, opens the first valve 11 and carries out extraction;Otherwise, it continues waiting for Temperature in drill hole decline and methane desorption, until carrying out extraction after meeting above-mentioned condition.
The present embodiment not makes any form of restriction shape of the invention, material, structure etc., all according to this hair Bright technical spirit any simple modification, equivalent change and modification to the above embodiments, belong to the technology of the present invention side The protection scope of case.

Claims (7)

1. a kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine, it is characterised in that: the following steps are included:
(1) it bores mounting hole: in construction extraction borehole place in advance, mounting hole being bored using the drill bit not less than φ 120mm, bores mounting hole 5~8m of depth;
(2) it installs and fixes orifice sealing connecting pipe: after the completion of mounting hole drilling, orifice sealing connecting pipe being installed to peace In the aperture for filling hole, then by injecting cement mortar, cement into mounting hole in the central passage of orifice sealing connecting pipe Mortar is re-filled with the annular gap between inner wall of the hole installing and orifice sealing connecting pipe outer wall by the bottom of mounting hole, until Central passage full of entire mounting hole and orifice sealing connecting pipe, solidification is for 24 hours;
(3) it mash gas pumping drilling construction: according to the length of design mash gas pumping drilling, selects to use diameter for φ 42mm, φ 75mm, φ 94mm, φ 114mm and φ 120mm drill bit drill along the center line of orifice sealing connecting pipe, first by aperture After the cement mortar for the solidification being tightly connected in pipe fitting drills out, then creep into design length;
(4) CaC is placed in mash gas pumping drilling2
(5) mine pressure pipe road connects aperture sealed joint pipe part, sprays the water in mash gas pumping drilling, closes after the completion of jet stream Closed pore mouth is tightly connected pipe fitting;
(6) CaC in mash gas pumping drilling2It is reacted with water and generates Ca (OH)2And C2H2, while a large amount of heat is generated, make in heat Under, coal-bed gas accelerates desorption, meanwhile, CaC2Incendivity is reacted with water, since there is also a small amount of in mash gas pumping drilling Air, CH under the action of air, in mash gas pumping drilling4With C2H2With under the collective effect of air occur Small Combustion or Explosion, further discharges heat, further promotes the desorption of coal-bed gas;When small blasting, also to the hole of mash gas pumping drilling Wall generates destruction, forms crack distressed zone, further increases coal-bed gas desorption efficiency;
(7) orifice sealing connecting pipe is connect into drainage tube, union carries out gas drainage;
(8) after gas drainage carries out for 24 hours, the gas density in mash gas pumping drilling is reduced to 30%, repeat step (4)~ (7).
2. the method that extraction rate is improved in the high gas remainder quantity coal seam of a kind of underground coal mine according to claim 1, special Sign is: orifice sealing connecting pipe includes the penetrating tube body of inner and outer ends, and the outer end of tube body is coaxial to be fixedly connected with annular Mounting plate, the internal diameter of annular mounting plate are equal to the outer diameter of tube body, and annular mounting plate outer surface is connected with by fastening bolt by pipe The ring flange that external port blocks, is provided with sealed bolster plate, tube body external peripheral surface is fixed between annular mounting plate and ring flange It is provided with the annular closure plate of the external port closure of annular gap, the outer diameter of annular closure plate is greater than the internal diameter of mounting hole;
Ring flange left and right side is connected separately with the first pipe fitting and the second pipe fitting, and the first valve is provided on the first pipe fitting , the second valve is provided on the second pipe fitting.
3. the method that extraction rate is improved in the high gas remainder quantity coal seam of a kind of underground coal mine according to claim 2, special Sign is: tube body external peripheral surface is evenly arranged with several spacing block sets being located in mounting hole, between spacing block set and annular The cement mortar contact of injection in gap keeps tube body fixed in mounting hole.
4. the method that extraction rate is improved in the high gas remainder quantity coal seam of a kind of underground coal mine according to claim 3, special Sign is: annular mounting plate lateral surface is coaxial to offer rounded seal groove, and ring flange medial surface is provided with and seal groove Corresponding sealing bulge loop, the width of rebate of seal groove are greater than the width of sealing bulge loop, seal groove and the cross section of sealing bulge loop Outer profile is in arc segment;Under the action of fastening bolt, sealing bulge loop presses sealed bolster plate into seal groove.
5. the method that extraction rate is improved in the high gas remainder quantity coal seam of a kind of underground coal mine according to claim 4, special Sign is: step (4) detailed process are as follows: after the completion of mash gas pumping drilling construction, by sealed bolster plate be mounted on annular mounting plate and Between ring flange, ring flange, the first pipe fitting and the second pipe fitting are connected to tube body outer end using fastening bolt, open the One valve closes the second valve, by CaC2Particulate matter is put into the first pipe fitting, using mine compressed air by CaC2Particulate matter is blown into In mash gas pumping drilling, the first valve is finally closed.
6. the method that extraction rate is improved in the high gas remainder quantity coal seam of a kind of underground coal mine according to claim 5, special Sign is: step (5) detailed process are as follows: the first pipe fitting is connect mine pressure pipe road, opens the first valve, high pressure water jets are incident upon In mash gas pumping drilling, the first valve is closed after the completion of jet stream.
7. the method that extraction rate is improved in the high gas remainder quantity coal seam of a kind of underground coal mine according to claim 6, special Sign is: step (7) detailed process are as follows: the first pipe fitting is connect drainage tube, union carries out extraction preparation, uses gas management Instrument connects the second pipe fitting, opens the second valve, tests CH in mash gas pumping drilling4Gas concentration and temperature, when temperature declines To 30 DEG C or less and drill in CH4Concentration is not less than 60%, opens the first valve and carries out extraction;Otherwise, the interior temperature that drills is continued waiting for Degree decline and methane desorption, until carrying out extraction after meeting above-mentioned condition.
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