CN102418549A - Technical method for extracting coalbed methane from constructed coal development area - Google Patents
Technical method for extracting coalbed methane from constructed coal development area Download PDFInfo
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- CN102418549A CN102418549A CN2011102315642A CN201110231564A CN102418549A CN 102418549 A CN102418549 A CN 102418549A CN 2011102315642 A CN2011102315642 A CN 2011102315642A CN 201110231564 A CN201110231564 A CN 201110231564A CN 102418549 A CN102418549 A CN 102418549A
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Abstract
The invention discloses a technical method for extracting coalbed methane from a constructed coal development area. The method comprises the following steps: (1) drilling a vertical shaft from the ground to a rock stratum; (2) drilling at the rock stratum; (3) carrying out shock blasting on the rock stratum; (4) drilling the vertical shaft to reach the depth of a coal bed and drilling at the coal bed; (5) carrying out pressure kick on the coal bed; and (6) carrying out development production on the coal bed, wherein the rock stratum area is positioned above a coal bed roof, the drilling direction of the rock stratum is parallel to the coal bed roof, and a distance is reserved between the rock stratum and the coal bed roof. By utilizing the technical method for extracting coalbed methane from the constructed coal development area, the pressure difference between the coal bed and the outside can be increased, and the air permeability of the coal bed is increased, so that the methane extraction effect of the constructed coal development area is greatly improved.
Description
Technical field
The present invention relates to the coal-bed gas exploitation field, especially a kind of structure coal is grown district's extraction coal bed gas process.
Background technology
Coal-bed gas is a kind of clear energy sources, but as far as a kind of especially disaster of Coal Production source.Take which kind of process means to come out the methane gas extraction in the coal seam, can mine safely and efficiently again is one of emphasis problem of coal production person and gas control worker research always.At present, to coal and the outstanding genesis mechanism of gas, everybody relatively more consistent view is to think by coal body structure, gas, the coefficient result of geostatic stress three.Wherein, the destructiveness of coal has determined the outstanding intensity of gas to a certain extent, simultaneously; The zone that the structure coal is grown mainly receives the effect of tectonic stress, very easily forms stress and concentrates; Simultaneously; The coal body structure is subjected to destruction to a certain degree, and the porous dehiscence slot sytem obtains changing, and gas gathers more easily; These have all increased coal and the outstanding danger of gas, not only affect coal production speed, the more important thing is and possibly endanger personal safety.The gas that how effectively to extract structure coal growth district can reduce coal and the outstanding danger of gas greatly.
The main means of gas control are extraction, and the difference of the gas permeability of coal bed gas and coal seam reservoirs pressure and external pressure is the important parameter that influences the extraction effect during extraction.Waterpower is extruded, hydraulic slotted liner technique, fracturing etc. are the important means of carrying out reservoir reconstruction.The structure coal is grown the district, and coal body is soft, is easy to the hole of collapsing during boring; Simultaneously, even pore-forming, when in these coal seams, transforming, because of coal crack agensis own, present various process meanses are not satisfactory to the gas permeability change of structure coal, even local the change arranged, but the change scope is also very limited.How taking a kind of technology, can change the gas permeability that the structure coal is grown district's structure coal, can guarantee the pressure differential in coal seam reservoirs pressure and extraneous space again, is to improve the structure coal to grow the difficult problem that district's gas pumping effect needs to be resolved hurrily.
Summary of the invention
The purpose of this invention is to provide a kind of coal seam and extraneous pressure reduction of making increases, and increases the gas permeability in coal seam own, and the structure coal that structure coal growth district's gas drainage under suction effect is improved is greatly grown district's extraction coal bed gas process.
Be to realize above-mentioned purpose, the present invention adopts following technical scheme: a kind of structure coal is grown district's extraction coal bed gas process, it is characterized in that: comprise the steps: that (1) open straight well from ground and get into the rock stratum; (2) creep into the rock stratum; (3) rock stratum loosening blasting, the coal seam degree of depth is crept into straight well again in (4), carries out the coal seam and creeps into; (5) coal seam pressure is exciting, (6) coal seam Development and Production; Said formation area is positioned on the roof, and the rock stratum drilling direction is parallel with roof and have at interval.
Said rock stratum is crept into and is on the roof in 5～20m scope, the thickness>=4.5m of rock stratum, and<30 ° the time, the rock stratum is crept into up or down and all can when seam inclination; When seam inclination>=30 °, upwards creep into the rock stratum, and it is consistent that trend is crept in rock stratum drilling direction and coal seam; Section boring length>=700m in the rock stratum, the rock stratum is crept into drilling direction with the institute working seam and is level or laterally creeps into and be parallel to each other.
The rock stratum is through behind the rod boring of rock stratum; Explosive is delivered to the suitable position of rockhole through the rock stratum drilling rod, and explosive is divided into an amount of many branches, repeatedly evenly places; Adopt conventional striker to ignite at the straight well wellbore section; Through igniting a small amount of explosive in the pit shaft, the lead-in wire of rock stratum section is ignited last ignition charge; Explosive type adopts emulsion.
The coal seam is crept into and is grown through the structure coal all with the pressure excitement in coal seam that creep in the district, anti-reflection integrated apparatus is realized; Creep in structure coal growth district, anti-reflection integrated apparatus comprises the drilling rod that the rear end is connected with rig, and the drilling rod front end is provided with drill bit, and drilling rod shaft outer ring is coated with air bag at interval; Drilling rod shaft between adjacent two air bags is provided with the gas fracturing hole; Said air bag is connected with air pump through the gentle pressure pipeline of air bag pipeline respectively with the gas fracturing hole, and air pump is connected with gas tank, is connected with the cutting blade around the drilling rod shaft between the rear end of said drill bit and the drilling rod; Cutting blade be obliquely installed and the tip backward; It is sagittal two-way drill bit that said cutting blade and drill bit constitute drilling direction, and the rotation direction of cutting blade is opposite with the drill bit rotation direction, and bit diameter is greater than drill pipe diameter;
The structure coal grows that the district creeps into, the drilling rod rear end in the anti-reflection integrated apparatus is connected with the rotating disk of rig; The gentle pressure pipeline of corresponding air bag pipeline offers air bag pipeline hole, pneumatic circuit hole respectively on the rotating disk; Air bag pipeline hole, pneumatic circuit hole are connected with tubulose air bag steel joint and pore steel joint respectively; The air bag pipeline is the high-pressure hose that is connected between air bag steel joint and the drilling rod shaft upper gasbag hole; Pneumatic circuit is to be connected in the high-pressure hose between the gas fracturing hole on pore steel joint and the drilling rod shaft; The gentle pressure pipeline of air bag pipeline all is positioned at drilling rod, and the air bag steel joint is communicated with a middle high-pressure hose again respectively with the pore steel joint and is connected with air pump; High-pressure hose is provided with pressure meter and air valve in the middle of said, and gas tank is connected at least two and also finally is connected with air pump, and each gas tank all has air valve, and said gas tank is the nitrogen gas tank of interior dress nitrogen;
Also comprise the annular solid that is welded in the drilling rod shaft, and annular solid offers the gas fracturing groove along the surface, border, the gas fracturing groove is over against the gas fracturing hole, and said pneumatic circuit is communicated with the gas fracturing hole through the gas fracturing groove; Two air bags are set on the drilling rod altogether at interval;
After the coal seam stops to creep into, when carrying out coal seam pressure excitement, booster air pump; Through the air bag pipeline to the pressurization of ventilating of two air bags, reach predetermined pressure after, close air pump; Connect pneumatic circuit, the starting pressure air pump begins to carry out the pressure excitement; Open the air valve valve then, energy is discharged, so repeatedly; It is exciting when coal seam pressure is exciting through nitrogen pressure.
In the coal seam, creep into length and be no more than 100 meters, the long 80-90 rice of said drilling rod shaft is provided with two air bags on the drilling rod altogether at interval, and the spacing of two air bags is 50 meters, and the sealing of hole pressure of air bag is not less than 20Mpa.
Said structure coal grows that the district creeps into, anti-reflection integrated apparatus comprises that also an end interted rotating disk and gets in the drilling rod; The other end connects the cooling water pipe of air pump and water pump respectively through pipeline; The pump outlet place connects water valve; Water pump is connected with the water source, and drill bit is provided with cooling water hole, and the shaft of cutting blade downside also is provided with cooling water hole.
Rock drilling tool is the structure coal and grows that creep in the district, anti-reflection integrated apparatus.
It is poor to the present invention is directed to structure coal growth district structure coal gas permeability; Reservoir pressure and extraneous pressure reduction are little; The difficult problem of extraction weak effect through in the roof sand layers, beating lateral aperture, is made cave technology through loosening blasting and air; The sand layers crack is improved greatly, and roof pressure obtains discharging; Through in the coal seam, utilizing the self-control drill bit, the coal seam is cut, cut, the gas permeability in coal seam is increased; Thereby realize the abundant release of structure coal growth district's roof; Coal seam and extraneous pressure reduction increase, and the gas permeability in coal seam own increases, and make the structure coal grow the purpose that gas drainage under suction effect in district's is improved greatly.
Efficiently solve the difficult problem of tectonic province pore-forming through carry out the coal bed gas extraction in the rock stratum.
Efficiently solve the difficult problem that the tectonic province coal body is difficult to strengthen, the tectonic province coal body also can effectively be strengthened.
Through loosening blasting and the exciting effectively combination of pressure, can make the good perforation of realization between petrosal foramen and the coal body.
Description of drawings
Fig. 1 is a principle process block diagram of the present invention;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is that creep in structure coal growth district, the structural representation of anti-reflection integrated apparatus.
The specific embodiment
Grow district's extraction coal bed gas process by Fig. 1-a kind of structure coal shown in Figure 3, comprise the steps:
(1) opening straight well from ground gets into the rock stratum and creeps into; Straight well will arrive roof strata 33 from ground through overlying rock 34 earlier again; Roof strata 33 is the said formation area that will creep into, and this zone is positioned on the roof, and the rock stratum is crept into and is on institute's working seam top board in 5～20m scope; The rock stratum of creeping into is harder rock stratum, the thickness >=4.5m of rock stratum; (rock stratum is crept into and is on institute's working seam top board in 5～20m scope; Thickness >=the 4.5m of rock stratum; Grow the optimum condition of distinguishing extraction coal bed gas process for structure coal according to the invention, if do not reach this condition, the staff also can according to circumstances adopt additive method extraction coal bed gas.）
(2) creep into the rock stratum:<30 ° the time, the rock stratum is crept into up or down and all can when seam inclination; When seam inclination>=30 °, upwards creep into the rock stratum, and it is consistent that trend is crept in rock stratum drilling direction and coal seam; Section boring length>=700m in the rock stratum; Rock stratum drilling direction and roof parallel interval are provided with, and the rock stratum is crept into drilling direction with the institute working seam and is level or laterally creeps into and be parallel to each other;
(3) rock stratum loosening blasting: after creep into through rock drilling tool the rock stratum; Explosive is delivered to the suitable position of rockhole through the rock stratum drilling rod, and explosive is divided into an amount of many parts, repeatedly evenly places; Adopt conventional striker to ignite at the straight well wellbore section; Through igniting a small amount of explosive in the pit shaft, the lead-in wire of rock stratum section is ignited last ignition charge; Explosive type adopts emulsion;
(4) again straight well is crept into the degree of depth in coal seam 32, carry out the coal seam and creep into;
(5) coal seam pressure is exciting;
(6) coal seam Development and Production.
Said coal seam is crept into and is grown through the structure coal all with the pressure excitement in coal seam that creep in the district, anti-reflection integrated apparatus 31 is realized, the structure coal grows that creep in the district, anti-reflection integrated apparatus 31 structures are following:
Creep in structure coal growth district by shown in Figure 3, anti-reflection integrated apparatus 31 comprises the drilling rod 10 that the rear end is connected with the rotating disk 8 of rig, and rotating disk 8 is driven by the transmission device of rig.(rig and rotating disk 8 thereof, transmission device and rotating disk 8 are prior art with the connected mode of drilling rod 10 ends, so be not described in detail.）
Drilling rod 10 front ends are provided with drill bit 19, are connected with several cutting blades 18 around drilling rod 10 shafts between the rear end of said drill bit 19 and the drilling rod 10, cutting blade 18 be obliquely installed and the tip backward, the rotation direction of cutting blade 18 is opposite with drill bit 19 rotation directions.The tip of drill bit 19 forward, it is sagittal two-way drill bit that cutting blade 18 constitutes drilling directions with drill bit 19.Said drill bit 19 is provided with cooling water hole 21, and drilling rod 10 shafts of cutting blade 18 downsides also are provided with cooling water hole 22.
Said drilling rod 10 shafts are provided with the external screw thread 9 that is used to discharge ickings.Shaft outer ring, drilling rod 10 middle part between drilling rod 10 rear ends and drill bit 19 is coated with two annular air-pockets 12 at interval; The long 80-90 rice of said drilling rod 10 shafts; The spacing of two air bags 12 is 50 meters; On drilling rod 10 shafts between two air bags 12, be provided with gas fracturing hole 15, said air bag 12 is connected with air pump 25 with pneumatic circuit 13 through air bag pipeline 11 respectively with gas fracturing hole 15, and promptly corresponding air bag pipeline 11 offers air bag pipeline hole, pneumatic circuit hole respectively with pneumatic circuit 13 on the rotating disk 8; Air bag pipeline hole, pneumatic circuit hole are connected with tubulose air bag steel joint 7 and pore steel joint 26 respectively; Air bag pipeline 11 is for to be connected in the high-pressure hose between air bag steel joint 7 and the drilling rod 10 shaft upper gasbag holes, and pneumatopyle is the hole of communicated air bags 12 on drilling rod 10 shafts, because air bag 12 is two; So air bag pipeline 11 also is two, corresponding two air bag pipelines 11 are provided with two air bag steel joints 7 in two air bag pipeline holes on the rotating disk 8; Be welded with annular solid 14 in drilling rod 10 shafts; Be that edge, annular solid 14 border is welded in drilling rod 10 shafts, (drilling rod 10 connects for multistage, for the ease of making; Annular solid 14 can be welded on earlier in that section drilling rod 10 that gas fracturing hole 15 is set, and merges with other drilling rods 10 to be connected again.) and annular solid 14 offer gas fracturing groove 16 along the surface, border; Gas fracturing groove 16 openings are over against gas fracturing hole 15; Annular solid 14 is provided with the connecting hole 17 that is communicated with gas fracturing groove 16; Said pneumatic circuit 13 is for being connected in the high-pressure hose between the gas fracturing hole 15 on pore steel joint 26 and drilling rod 10 shafts, and promptly said pneumatic circuit 13 inserts connecting hole 17 and is communicated with gas fracturing hole 15 through gas fracturing groove 16.Said air bag pipeline 11 all is positioned at drilling rod 10 with pneumatic circuit 13, and the air bag pipeline 11 of annular solid 14 rear sides can intert in the past through the inner diameter hole of annular solid 14.
Said each air bag steel joint 7 is communicated with a middle high-pressure hose 4 again respectively with pore steel joint 26 to be realized being connected with air pump 25, and high-pressure hose 4 is equipped with pressure meter 5, air valve valve 6, flow meter and pressure gauge in the middle of each.Air pump 25 is connected with gas tank 1, and gas tank 1 is connected two and finally be connected with air pump 25 at least, and through high-pressure hose 3 four gas tanks 1 of connecting altogether, each gas tank 1 all has air valve 2 in the present embodiment.
Comprise that also an end interted rotating disk 8 and gets in the drilling rods 10, the other end connects the high-pressure cooling water pipe 27 of air pump 25 and water pump 28 respectively through pipeline, and the delivery port place of water pump 28 connects water valve, and water pump 28 is connected with water source 29.Water source 29 can be pond or water pot.
Creep in structure coal growth of the present invention district, anti-reflection integrated apparatus 31, has constituted three systems altogether, i.e. pressure system 24, sealing system 23, drilling system 20.
One. drilling system 20
Drilling system 20 comprises Rotary table for drilling machine 8, drilling rod 10, two-way drill bit, cooling water hole 21,22 etc., and this system carries out creeping into and playing booster action for extracting of drilling tool of coal seam.
Two-way drill bit is installed at drill bit 19 places by this system.For the technology that simplifies the operation, both rotate with drilling rod 10 simultaneously in drilling process, but direction of rotation is opposite, and both all are welded on the drilling rod 10.When creeping into forward, got out bigger space, so the back drill body is inoperative basically owing to preceding drill bit 19.When outwards extracting drilling tool, the main cause that drilling tool is difficult to extract is blocked at drill bit 19 places exactly, at this moment can start the rig rotation, utilizes cutting blade 18 to cut coal body, owing to be that therefore secondary creeps into and can extract easily.If can't extract, then can become flexible by the exciting device of starting pressure.
The ickings that gets out is discharged through the screw thread on the drilling rod 10.Discharge power and just lean on mechanical rotation, again by containing the blast effect of low amounts of water.Because broken coal is difficult for contacting with water, mainly lean on wind-force to discharge ickings at this, a spot of water both can improve the carrying capacity of wind, simultaneously can cold drill bit 19.Discharge through cooling water hole 21,22 after the cooling.The water hole of logical cooling water can be set in the center on the Rotary table for drilling machine 8.The gas that wherein is mixed with low amounts of water is pumped into high pressure high-pressure cooling water pipe 27 through water pump 28 and high-pressure pump 25, gets into drilling rod 10 then.
Two. sealing system 23
Sealing system 23 comprises high-pressure hose, closed capsule etc., and limited in one's ability in view of gas fracturing, this system provides a less confined space for carrying out the excitement of segmentation pressure; This system plays the effect of sealing.
After completion is crept into, there is no need to carry out again the pressure excitement for the very broken coal body that is difficult to pore-forming.For can pore-forming, coal body be very broken boring relatively.Drilling tool is moved to suitable position.Start 25 pairs of closed airbags 12 of high-pressure pump then and begin inflation, up to reaching predetermined pressure, wherein predetermined pressure is greater than maximum surge pressure.Valve-off after air bag 12 complete closed is avoided gas leakage.
Closed airbag 12 is fixed on the drilling rod 10, and in order to reach better strengthening effect, the distance between two closed airbags 12 is advisable with 50m, and concrete condition is looked on-site actual situations and decided.In drilling process, air bag 12 leans on elasticity tightly to be attached on the drilling rod 10, can not influence ickings and flow out on the limit from it.Air bag 12 is an annular, is looped around on the drilling rod 10.
Three. pressure system 24
An annular solid 14 is installed at the exciting place of pressure, is welded on the drilling rod 10, is communicated with through gas fracturing hole 15 between the gas fracturing groove 16 of annular solid 14 and the coal body.When carrying out the pressure excitement, gases at high pressure flow to the exciting place of pressure through pneumatic circuit 13, interact then and between the coal body.Gases at high pressure are through high-pressure pump 25 acquisition of pressurizeing.Maximum pressure is the bigger the better, and minimum is not less than 15Mpa.Concrete surge pressure and exciting number of times are decided according to performance.
Creep in structure coal growth of the present invention district, anti-reflection integrated apparatus 31 concrete steps in use are following:
1. with straight well well head place, the pressure system 24 placement face of land; The place is provided with wellhead assembly at well head; Creep in structure coal growth district, high-pressure hose and other pipelines of anti-reflection integrated apparatus 31 all pierce into through wellhead assembly; Wellhead assembly is a prior art, plays the effect of stationary positioned, so be not described in detail.
2. get the device of gas tank 1 ready, the testing fixture tightness.
3. drill bit 19 is installed, is carried out the coal seam section and creep into.
4. creep into after the end, whether decision carries out the pressure excitement according to the coal body situation.
5. when pressure is exciting, start high-pressure pump 25, pressurize through 11 pairs two air bags 12 of air bag pipeline, reach predetermined pressure after, close air pump 25.
6. connect pneumatic circuit 13, starting pressure air pump 25 begins to carry out the pressure excitement, opens air valve valve 6 then suddenly, energy is discharged, so repeatedly several times.After two air bags 12 fill and rise, but the ickings between shutoff two air bags 12 is more conducive to gas fracturing, improves the gas permeability of coal.
7. all carried out reservoir reconstruction up to every section.Open rig, from the coal hole, extract drilling equipment.
8. seal boring, insert extraction pipeline and carry out extraction.
9. collating unit.
Be the structure coal at rock drilling tool described in the step (3) and grow that creep in the district, anti-reflection integrated apparatus 31, concrete use is the same, does not need pressure excited when creep into the rock stratum, so this drilling rod only uses in creeping into and creeps into function and get final product.From the straight well to the level or creep into horizontal rock stratum and straight well creeps into to level or horizontal coal seam all and can realize that whipstock and method for using thereof are prior art commonly used, so be not described in detail through whipstock.
Claims (7)
1. a structure coal is grown district's extraction coal bed gas process; It is characterized in that: comprise the steps: that (1) open straight well from ground and get into the rock stratum, creep into (2) rock stratum, (3) rock stratum loosening blasting; (4) again straight well is crept into the coal seam degree of depth; Carry out the coal seam and creep into, (5) coal seam pressure is exciting, (6) coal seam Development and Production; Said formation area is positioned on the roof, and the rock stratum drilling direction is parallel with roof and have at interval.
2. structure coal as claimed in claim 1 is grown district's extraction coal bed gas process; It is characterized in that: said rock stratum is crept into and is on the roof in 5～20m scope; Thickness>=the 4.5m of rock stratum,<30 ° the time, the rock stratum is crept into up or down and all can when seam inclination; When seam inclination>=30 °, upwards creep into the rock stratum, and it is consistent that trend is crept in rock stratum drilling direction and coal seam; Section boring length>=700m in the rock stratum, the rock stratum is crept into drilling direction with the institute working seam and is level or laterally creeps into and be parallel to each other.
3. according to claim 1 or claim 2 structure coal is grown district's extraction coal bed gas process, and it is characterized in that: after crept into through rock drilling tool the rock stratum, explosive was delivered to the suitable position of rockhole through the rock stratum drilling rod; Explosive is divided into an amount of many parts; Repeatedly evenly place, adopt conventional striker to ignite, through igniting a small amount of explosive in the pit shaft at the straight well wellbore section; Lead-in wire to the rock stratum section is ignited, last ignition charge; Explosive type adopts emulsion.
4. structure coal as claimed in claim 3 is grown district's extraction coal bed gas process; It is characterized in that: the coal seam is crept into and is grown through the structure coal all with the pressure excitement in coal seam that creep in the district, anti-reflection integrated apparatus is realized; Creep in structure coal growth district, anti-reflection integrated apparatus comprises the drilling rod that the rear end is connected with rig, and the drilling rod front end is provided with drill bit, and drilling rod shaft outer ring is coated with air bag at interval; Drilling rod shaft between adjacent two air bags is provided with the gas fracturing hole; Said air bag is connected with air pump through the gentle pressure pipeline of air bag pipeline respectively with the gas fracturing hole, and air pump is connected with gas tank, is connected with the cutting blade around the drilling rod shaft between the rear end of said drill bit and the drilling rod; Cutting blade be obliquely installed and the tip backward; It is sagittal two-way drill bit that said cutting blade and drill bit constitute drilling direction, and the rotation direction of cutting blade is opposite with the drill bit rotation direction, and bit diameter is greater than drill pipe diameter;
The structure coal grows that the district creeps into, the drilling rod rear end in the anti-reflection integrated apparatus is connected with the rotating disk of rig; The gentle pressure pipeline of corresponding air bag pipeline offers air bag pipeline hole, pneumatic circuit hole respectively on the rotating disk; Air bag pipeline hole, pneumatic circuit hole are connected with tubulose air bag steel joint and pore steel joint respectively; The air bag pipeline is the high-pressure hose that is connected between air bag steel joint and the drilling rod shaft upper gasbag hole; Pneumatic circuit is to be connected in the high-pressure hose between the gas fracturing hole on pore steel joint and the drilling rod shaft; The gentle pressure pipeline of air bag pipeline all is positioned at drilling rod, and the air bag steel joint is communicated with a middle high-pressure hose again respectively with the pore steel joint and is connected with air pump; High-pressure hose is provided with pressure meter and air valve in the middle of said, and gas tank is connected at least two and also finally is connected with air pump, and each gas tank all has air valve, and said gas tank is the nitrogen gas tank of interior dress nitrogen;
Also comprise the annular solid that is welded in the drilling rod shaft, and annular solid offers the gas fracturing groove along the surface, border, the gas fracturing groove is over against the gas fracturing hole, and said pneumatic circuit is communicated with the gas fracturing hole through the gas fracturing groove; Two air bags are set on the drilling rod altogether at interval;
After the coal seam stops to creep into, when carrying out coal seam pressure excitement, booster air pump; Through the air bag pipeline to the pressurization of ventilating of two air bags, reach predetermined pressure after, close air pump; Connect pneumatic circuit, the starting pressure air pump begins to carry out the pressure excitement; Open the air valve valve then, energy is discharged, so repeatedly; It is exciting when coal seam pressure is exciting through nitrogen pressure.
5. structure coal as claimed in claim 4 is grown district's extraction coal bed gas process; It is characterized in that: in the coal seam, creep into length and be no more than 100 meters; The long 80-90 rice of said drilling rod shaft; At interval two air bags are set altogether on the drilling rod, the spacing of two air bags is 50 meters, and the sealing of hole pressure of air bag is not less than 20Mpa.
6. structure coal as claimed in claim 5 is grown district's extraction coal bed gas process; It is characterized in that: said structure coal grows that the district creeps into, anti-reflection integrated apparatus comprises that also an end interted rotating disk and gets in the drilling rod; The other end connects the cooling water pipe of air pump and water pump respectively through pipeline, the pump outlet place connects water valve, and water pump is connected with the water source; Drill bit is provided with cooling water hole, and the shaft of cutting blade downside also is provided with cooling water hole.
7. structure coal as claimed in claim 6 is grown district's extraction coal bed gas process, it is characterized in that: said rock drilling tool is the structure coal and grows that creep in the district, anti-reflection integrated apparatus.
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| CN102889958A (en) * | 2012-10-30 | 2013-01-23 | 山西潞安矿业(集团)有限责任公司 | Coal bed gas pressure direct measurement device and pressure measurement method thereof |
| CN102926730A (en) * | 2012-11-13 | 2013-02-13 | 王建生 | Mining method for support pipe following air liquid spraying and drilling into coal bed gas of radial well |
| CN104329113A (en) * | 2014-09-03 | 2015-02-04 | 安徽理工大学 | Gas drainage method by pressure relief of coal bed bottom plate through ground drilling and loosening blasting |
| CN104612611A (en) * | 2015-01-09 | 2015-05-13 | 四川川煤华荣能源股份有限公司大宝顶煤矿 | Jamming-prevention drill pipe structure |
| CN106370820A (en) * | 2016-11-10 | 2017-02-01 | 淮南矿业(集团)有限责任公司 | Method for researching oxidization degree of coal seam during drilling down coal seam by adopting nitrogen deslagging |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN108590653A (en) * | 2018-03-02 | 2018-09-28 | 煤炭科学技术研究院有限公司 | Coal and gas prominent release energy dissipating cooperates with preventing control method with media property transformation |
| CN110359909A (en) * | 2019-07-01 | 2019-10-22 | 安徽理工大学 | A kind of softening method for leaving coal column for hard coal seam |
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| CN110359909A (en) * | 2019-07-01 | 2019-10-22 | 安徽理工大学 | A kind of softening method for leaving coal column for hard coal seam |
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