CN108643960A - A kind of ground region band coal mine gas extinction technique - Google Patents
A kind of ground region band coal mine gas extinction technique Download PDFInfo
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- CN108643960A CN108643960A CN201810486202.XA CN201810486202A CN108643960A CN 108643960 A CN108643960 A CN 108643960A CN 201810486202 A CN201810486202 A CN 201810486202A CN 108643960 A CN108643960 A CN 108643960A
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
Abstract
The present invention proposes a kind of ground region band coal mine gas extinction technique, includes the following steps：Branched layout mode is carried out preferably；Straight well well location is carried out preferred；Kickoff point (KOP) is carried out preferred；Branch parameter is carried out preferred；Reservoir reconstruction technique is carried out preferred；Drilling well and deflecting；Main branch section drilling is completed, and the coal petrography heart is observed；Complete branch's drilling；Complete main branch hydraulic jetting fracturing；It is designed according to mining and starts mining.Advantages of the present invention：Ground coal bed gas development cost can be not only reduced by the technique, but also the gas pumping period can be shortened, realizes the purpose for quickly reducing coal seam gas-bearing capacity, to improving coal mine output, quickening coal industry fast development, which has, greatly facilitates effect.
Description
Technical field
The present invention relates to coal mine gas extinction techniques, particularly relate to a kind of ground region band coal mine gas extinction technique.
Background technology
Coal occupies very important status in terms of Chinese national economy construction, energy demand.With national economy
Rapid development, is continuously increased coal demand, mining rate, mining depth, crustal stress constantly increase, and absolute gas emission rate is not
Break and increase, leads to single by ventilation solution gas exceeding limit difficulty increase, the machine that coal petrography-gas composite power Disasters occur
It can be with the possibility showed increased of coal and gas prominent.Therefore, it is necessary to reduce the gas bearing capacity in coal seam by some measures,
Reduce the generation of coal and gas prominent, coal petrography composite power disaster accident.The method for reducing coal seam gas-bearing capacity includes mainly well
Lower extraction and ground extraction.Although underground gas extraction can play the purpose for quickly reducing gas bearing capacity, its quantities
Greatly, treatment cost is high.Simultaneously as mash gas extraction concentration is low, utilization rate is relatively low, the methane gas being directly discharged in air
Body not only is caused seriously to pollute, but also is resulted in waste of resources to environment.Not with China's ground coal bed gas fundamental research
Disconnected perfect, coal bed gas Ground Developing technique gradually tends to be ripe.To the region that need not be mined in a short time, pass through ground coal seam
Gas well carries out gas pumping, can reduce coal seam gas-bearing capacity, reduce the danger of coal and gas prominent.But existing routine is straight
Well control range is relatively limited, and ground carries out being susceptible to blind area when coal bed gas extraction, and the development cycle is relatively long, coal mine
For highly gassy mine, especially coal and gas outburst mine in recovery process, often lead to do not dropping to safety of coal mines completely
Underground has proceeded by coal mining activity when gas bearing capacity standard as defined in regulation, causes face take-over nervous, influences coal mine peace
Entirely, efficiently production.Therefore, there is an urgent need to a kind of techniques not only can effectively reduce coal seam gas-bearing capacity, but also can shorten open
The period is sent out, realizes the purpose that coal-bed gas quickly reduces.Coal-bed gas is only reduced, the safe efficient production of coal mine ability carries
High coal mine output.
Invention content
The present invention proposes a kind of ground region band coal mine gas extinction technique, solves conventional coal bed gas in the prior art
The extraction period is long during straight well, horizontal well development, it is difficult to solve the problems, such as face take-over anxiety.
The technical proposal of the invention is realized in this way：A kind of ground region band coal mine gas extinction technique, including such as
Lower step：
A. according to reservoir characteristics and geologic feature, branched layout mode is carried out preferably；
B. according to resource potential evaluation result and rock stratum lithology, spatial, straight well well location is carried out preferred；
C. kickoff point (KOP) is carried out according to the data such as previous exploration and development data and coal mine exposure preferred；
D. according to coal seam reservoirs permeability characteristics and prediction area working face arrangement, branch parameter is carried out preferred；
E. according to reservoir characteristic, reservoir reconstruction technique is carried out preferred；
F. it after drilling equipment being transported to well site, is designed according to early period, starts straight well section drilling, basement rock or less design is deep when being drilled into
One is completed after degree and ends well, and wherein cementing concrete returns to ground, continues thereafter with drilling, when being drilled into pre- kickoff point (KOP), according to coring
As a result lithology and stratum characteristic are carried out sentencing knowledge, if meeting deflecting requirement starts deflecting, otherwise chooses kickoff point (KOP) again, and complete
Two open well cementation；
G. after completing deflecting, according to design requirement, main branch section drilling is completed, and be observed to the coal petrography heart, analyzed along main branch coal
Body structure change feature provides foundation, wherein three open without well cementing of cement for branch's kickoff point (KOP) selection；
H. after choosing kickoff point (KOP), continue drilling to projected depth, be sequentially completed branch's drilling；
I. main branch hydraulic jetting fracturing is completed according to FRACTURING DESIGN, is sequentially completed follow-up work；
J. it is designed according to mining and starts mining.
In the step a, branched layout mode is preferred, is according to coal seam thickness and the coal seam number of plies, to the space of branch
Position relationship is arranged with preferably, and main Zhi Jingwei horizontal wells, Multilateral Wells use in the same direction with main branch well and are parallel to main Zhi Jingfang
To drilling；
For single coal bed；It is several using being carried out on main Zhi Jing when only carrying out extraction to the pre- Mining Area gas in side
Branch well drilling into；It is the same pressure system when both sides working face is at a distance of relatively close, and when reservoir geology condition is close, simultaneously
Extraction is carried out to both sides face gas, is crept into using a main branch well is carried out in same pit shaft both sides, on every main Zhi Jing
Carry out several branch well drillings into；
For two layers and two layers or more coal seam of development, spacing is smaller, and the similar region of reservoir conditions, and layer is closed using multilayer coal
The mode of mining；It is closer for two layers coal distance, and be suitble to close the region of layer mining, when Coal Pore Structure is complete, using same
One main branch well carries out the drilling of two layers of coal seam Multilateral Wells；It is larger and two for drilling out multiple branch's difficulty in horizontal segment simultaneously
The excessive region of layer coal spacing carries out deflecting using not existing together in same pit shaft respectively, is carried out two layers in two main branch wells respectively
The drilling of coal seam Multilateral Wells.
In the step b, well location will consider formation stability when selecting, far from tomography, karst collapse col umn and geological structure
Complex region is convenient for the determination of kickoff point (KOP).
In the step c, kickoff point (KOP) it is preferred, be according to wellbore trace by rock stratum property, select layer position steady
Fixed place carries out deflecting, including main branch well kickoff point (KOP) selection and Multilateral Wells kickoff point (KOP) selection；For the kickoff point (KOP) of main Zhi Jing
It chooses, to select layer position stabilization, the preferable layer position of rock strength, avoid in mud stone, shale deflecting；Multilateral Wells deflecting is clicked
It takes, is observed according to coal petrography coring in main branch drilling process, select to carry out the deflecting and drilling of Multilateral Wells in hard coal development area.
In the step d, branch parameter optimization, is according to extraction period, reservoir permeability feature, reasonable Arrangement branch
Spacing, number of branches and branch length；
In order to determine rational branch's spacing, reservoir permeability should be tested first, really according to reservoir permeability quality
Fixed rational branch's spacing can suitably increase branch's spacing for the preferable region of permeability, poor for permeability
Region, since reservoir gas migration resistance is larger, it should reduce the spacing of branch, reduce gas in the migration not being transformed in reservoir
Distance, branch's spacing are 15 ~ 45m；
The determination of number of branches is mainly according to branch's spacing and Ileal neobladder width, and branch's spacing is smaller, and number of branches is bigger,
Branch's spacing is bigger, and branch's number is smaller, and number of branches is 4 ~ 6；
For the coal dust in mining reservoir as possible, reservoir stress is made to be released, it should increase branch length as possible, still, point
Zhi Changdu is excessive, increases drilling well difficulty, and length is long that depth gas is caused to be difficult to migrate, so, branch length 600
~800m。
Branch's spacing is 20-30m.
In the step e, according to reservoir characteristic, reservoir reconstruction technique is carried out preferred；Reservoir reconstruction technique is preferred, is
According to the reservoir reconstruction technique that reservoir characteristics selection is adapted therewith, reservoir permeability is improved, including waterpower is carried out to main branch well
Injection transformation；Wherein water-jet is intersegmental away from for 30 ~ 50m, and arrangement of nozzles uses 180 ° of phase distributions, every meter of 4-5 nozzle to spray
Jetting presses 20-35MPa, time to be not less than 30 minutes.
Advantages of the present invention：
（1）Multiple horizontal wells share a straight well section, reduce straight well section drilling engineering amount, shorten the construction time, while big
Straight well section drilling cost is reduced greatly, reduces exploitation input.
（2）Multiple net horizontal sections share a set of extraction equipment, reduce surface well number of fields and extraction equipment, reduce into
This, at the same it is defeated convenient for on-site maintenance, operation and gas collection.
（3）The a large amount of coal dust discharges of drilling process, which play, lets out stress, improves reservoir flow conductivity.Meanwhile shortening
Gas reduces gas and migrates resistance to pit shaft, be convenient for coal bed gas quick output, meet coalman to pit shaft migration distance
Needs are taken over as face.
Ground coal bed gas development cost can be not only reduced by the technique, but also the gas pumping period can be shortened, it is real
The purpose for now quickly reducing coal seam gas-bearing capacity, to improving coal mine output, quickening coal industry fast development, which has, greatly to be promoted
Into effect.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the unidirectional Multilateral Wells arrangement schematic diagram of single coal bed.
Fig. 2 is single coal bed dicomponent well arrangement schematic diagram.
Fig. 3 is two layers of coal seam Multilateral Wells arrangement schematic diagram one.
Fig. 4 is two layers of coal seam Multilateral Wells arrangement schematic diagram two.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of not making the creative labor
Embodiment shall fall within the protection scope of the present invention.
A kind of ground region band coal mine gas extinction technique, includes the following steps：
A. according to reservoir characteristics and geologic feature, branched layout mode is carried out preferably；
Henan is largely single coal bed, and only table mountain is developed for multiple seam, but coal seam interlamellar spacing is larger, and majority does not have exploitation
Protective layer condition.
B. according to resource potential evaluation result and rock stratum lithology, spatial, straight well well location is carried out preferred；
C. kickoff point (KOP) is carried out according to the data such as previous exploration and development data and coal mine exposure preferred；
D. according to coal seam reservoirs permeability characteristics and prediction area working face arrangement, branch parameter is carried out preferred；
E. according to reservoir characteristic, reservoir reconstruction technique is carried out preferred；
F. it after drilling equipment being transported to well site, is designed according to early period, starts straight well section drilling, basement rock or less design is deep when being drilled into
One is completed after degree and ends well, and wherein cement returns to ground, continues thereafter with drilling, when being drilled into pre- kickoff point (KOP), according to coring result
Lithology and stratum characteristic are carried out sentencing knowledge, if meeting deflecting requirement starts deflecting, otherwise choose kickoff point (KOP) again, and complete two and open
Well cementation；
G. after completing deflecting, according to design requirement, main branch section drilling is completed, and be observed to the coal petrography heart, analyzed along main branch coal
Body structure change feature provides foundation, wherein three open without well cementing of cement for branch's kickoff point (KOP) selection；
H. after choosing kickoff point (KOP), continue drilling to projected depth, be sequentially completed branch's drilling；
I. main branch hydraulic jetting fracturing is completed according to FRACTURING DESIGN, is sequentially completed follow-up work；
J. it is designed according to mining and starts mining.
In the step a, branched layout mode is preferred, is according to coal seam thickness and the coal seam number of plies, to the space of branch
Position relationship is arranged with preferably, and main Zhi Jingwei horizontal wells, Multilateral Wells use in the same direction with main branch well and are parallel to main Zhi Jingfang
To drilling；
For single coal bed；It is several using being carried out on main Zhi Jing when only carrying out extraction to the pre- Mining Area gas in side
Branch well drilling into；It is the same pressure system when both sides working face is at a distance of relatively close, and when reservoir geology condition is close, simultaneously
Extraction is carried out to both sides face gas, is crept into using a main branch well is carried out in same pit shaft both sides, on every main Zhi Jing
Carry out several branch well drillings into；
For two layers and two layers or more coal seam of development, spacing is smaller, and the similar region of reservoir conditions, and layer is closed using multilayer coal
The mode of mining；It is closer for two layers coal distance, and be suitble to close the region of layer mining, when Coal Pore Structure is complete, using same
One main branch well carries out the drilling of two layers of coal seam Multilateral Wells；It is larger and two for drilling out multiple branch's difficulty in horizontal segment simultaneously
The excessive region of layer coal spacing carries out deflecting using not existing together in same pit shaft respectively, is carried out two layers in two main branch wells respectively
The drilling of coal seam Multilateral Wells.
In the step b, well location will consider formation stability when selecting, far from tomography, karst collapse col umn and geological structure
Complex region is convenient for the determination of kickoff point (KOP).
In the step c, kickoff point (KOP) it is preferred, be according to wellbore trace by rock stratum property, select layer position steady
Fixed place carries out deflecting, including main branch well kickoff point (KOP) selection and Multilateral Wells kickoff point (KOP) selection；For the kickoff point (KOP) of main Zhi Jing
It chooses, to select layer position stabilization, the preferable layer position of rock strength, avoid in mud stone, shale deflecting；Multilateral Wells deflecting is clicked
It takes, is observed according to coal petrography coring in main branch drilling process, select to carry out the deflecting and drilling of Multilateral Wells in hard coal development area.
In the step d, branch parameter optimization, is according to extraction period, reservoir permeability feature, reasonable Arrangement branch
Spacing, number of branches and branch length；
In order to determine rational branch's spacing, reservoir permeability should be tested first, really according to reservoir permeability quality
Fixed rational branch's spacing can suitably increase branch's spacing for the preferable region of permeability, poor for permeability
Region, since reservoir gas migration resistance is larger, it should reduce the spacing of branch, reduce gas in the migration not being transformed in reservoir
Distance, branch's spacing are 15 ~ 45m；
The determination of number of branches is mainly according to branch's spacing and Ileal neobladder width, and branch's spacing is smaller, and number of branches is bigger,
Branch's spacing is bigger, and branch's number is smaller, and number of branches is 4 ~ 6；
For the coal dust in mining reservoir as possible, reservoir stress is made to be released, it should increase branch length as possible, still, point
Zhi Changdu is excessive, increases drilling well difficulty, and length is long that depth gas is caused to be difficult to migrate, so, branch length 600
~800m。
Branch's spacing is 20-30m.
In the step e,
According to reservoir characteristic, reservoir reconstruction technique is carried out preferred
Reservoir reconstruction technique is preferred, is the reservoir reconstruction technique being adapted therewith according to reservoir characteristics selection, improves reservoir infiltration
Property, including water-jet transformation is carried out to main branch well；Wherein water-jet is intersegmental away from for 30 ~ 50m, and arrangement of nozzles uses 180 ° of phases
Bit distribution, every meter of 4-5 nozzle spray hydraulic pressure 20-35MPa, and the time is not less than 30 minutes.
The invention content includes mainly：Branched layout method optimizing, well location are preferred, kickoff point (KOP) is preferred, branch parameter optimization
And reservoir reconstruction technique is preferred.Wherein branched layout method optimizing is mainly according to coal seam thickness and the coal seam number of plies etc. to branch
Arrangement is selected；Well location preferably mainly according to resource potential evaluation and geologic information, optimizes well location；Deflecting
Point is preferably mainly property according to wellbore trace institute by rock stratum, selects progress deflecting at the stabilization of layer position；Branch parameter is excellent
Change is mainly according to extraction period, reservoir permeability feature, reasonable Arrangement branch spacing and number of branches；Reservoir reconstruction technique
The reservoir reconstruction technique being preferably mainly adapted therewith according to reservoir characteristics selection, improves reservoir permeability.
（1）Branched layout method optimizing
Branched layout method optimizing is mainly arranged and optimizes to the spatial relation of branch.
For single coal bed, in order to increase the contact area of pit shaft and coal seam, gas is reduced to pit shaft migration resistance, is realized
Quickly reduce the purpose of coal seam gas-bearing capacity.Branch is using main Zhi Fangxiang drillings are parallel to, when only to the pre- Mining Area in side
It is as shown in Figure 1 that gas carries out branched layout when extraction.It is the same pressure system, and store up when both sides working face is at a distance of relatively close
When layer geological conditions is close, can extraction be carried out to both sides face gas simultaneously, wherein branched layout is as shown in Figure 2.It is this
Arrangement reduces the construction of a vertical bore compared with Fig. 1 arrangements.
For two layers and two layers or more coal seam of development, spacing is smaller, and the similar region of reservoir conditions, may be used more
Layer coal closes the mode of layer mining.Multilayer coal lamination layer extraction arrangement and two layers of coal conjunction layer extraction arrangement are similar, here,
Only it is described by taking two layers of coal as an example.
It is closer for two layers coal distance, and be suitble to close the region of layer mining, when Coal Pore Structure is complete, it is appropriate for branch
The drilling that two layers of coal branch is carried out in the same main branch horizontal segment may be used, as shown in Figure 3 in the region of drilling.For simultaneously
The region that multiple branch's difficulty are larger and two layers of coal spacing is excessive is drilled out in horizontal segment, may be used different in straight well section respectively
Place carries out deflecting, carries out the drilling of two layers of coal branch in two main branch horizontal segments respectively, as shown in Figure 4.
（2）Well location is preferred
Well location is preferably mainly selected according to coal bed gas geological conditions, such as：Coal seam buried depth, coal seam thickness, complexity of structures, gas
The geologic(al) factors such as preservation situation, Coal Pore Structure determine that well location is preferably the prior art, and adaptation to local conditions selects different Optimal Parameters
Carry out selection determination.
Well location is preferably mainly according to cbm development potentiality, branched layout mode and coal mine mining work activities etc., full
Foot channel Ji, it is highly efficient and productive on the basis of, development wells are determined.
Coal bed gas carries out the final purpose of extraction, is to carry out quick extraction to pre- exploiting field gas, meets face take-over need
It wants, so first having to determine branched layout direction when carrying out well location and determining.The usually stripped arrangement of working face, so branch
Trend usually parallel move towards direction with working face.It, be according to pre- exploiting field coal bed gas resource potentiality after branch moves towards to determine
Evaluation result, resource potential are mainly the preservation amount size of coal bed gas in coal seam, and same coal seam thickness, ton coal gas bearing capacity are related,
Preservation amount is big, and the extraction time is just grown, and regulation or less is reduced in finite time need to just consider cloth pitch of holes.Cloth is carried out to branch
It sets, makes what it to the greatest extent can be more than energy to pass through high yield enrichment region, the substantially arrangement orientation of branch is determined on the basis of maximizing the benefits.
Due to carrying out extraction using horizontal well, so kickoff point (KOP) is located at below straight well well location, therefore when well location selects one
Surely it to consider formation stability, far from tomography, karst collapse col umn and geological structure complex region, be convenient for the determination of kickoff point (KOP).
（3）Kickoff point (KOP) is preferred
The selection of kickoff point (KOP) mainly includes the selection of the selection and Multilateral Wells kickoff point (KOP) of main branch well kickoff point (KOP).
Layer position is selected to stablize the kickoff point (KOP) of main Zhi Jing, the higher layer position of the preferable sandstone equal strength of rock strength.
It is avoided as possible in the rock stratum such as mud stone, shale deflecting.Mainly since such rock strength is relatively low, direction of deflection is difficult to determine, holds
Easily lead to deflecting failure.
Multilateral Wells kickoff point (KOP) is chosen, is mainly observed according to coal petrography coring in main branch drilling process.By to coal petrography
Coring analysis observation, carries out the division of Coal Pore Structure.It selects to carry out Multilateral Wells in hard coal development area as possible when branch creeps into
Deflecting and drilling.
（4）Branch parameter optimizes
The optimization of branch parameter mainly optimizes branch parameter according to the quality of reservoir primary permeability.
Embranchment optimization is optimized according to each mine geology condition, each mining area（Or same mining area difference field with "nine squares"）It is oozed
Permeability difference is very big, and coal seam permeability has larger anisotropism.The overall principle according to each mining area permeability feature, according to
Permeability size 0.001-0.1mD determines that branch's spacing is typically chosen 20-30m ranges.
Embranchment optimization is mainly the optimization of branch's spacing.Realize the purpose of rapid outburst elimination, then in Multilateral Wells control range
Gas should quickly can migrate into pit shaft.Rational branch spacing can be such that gas just transports before the deadline
Move output.In order to determine rational branch's spacing, reservoir permeability should be tested first, according to reservoir permeability quality
Determine rational branch's spacing.For the preferable region of permeability, it can suitably increase branch's spacing, it is poor for permeability
Region, since reservoir gas migration resistance is larger, it should reduce the spacing of branch, reduce gas in the fortune not being transformed in reservoir
Move distance, it is proposed that branch's spacing is 15 ~ 45m, can be optimized according to the difference of each region actual conditions.
The determination of number of branches is mainly according to branch's spacing and Ileal neobladder width, and branch's spacing is smaller, number of branches
Bigger, branch's spacing is bigger, and branch's number is smaller, and usual branch's number is advisable with 4 ~ 6.For the coal dust in mining reservoir as possible,
Reservoir stress is set to be released, it should increase branch length as possible.But branch length is excessive, increases drilling well difficulty, and
Length is long to cause depth gas to be difficult to migrate.So, it is proposed that branch length is advisable with 600 ~ 800m, and root is wanted in practice of construction
According to the actual conditions in each region, it is adjusted.
（5）Reservoir reconstruction technique is preferred
Reservoir reconstruction technique is mainly transformed main Zhi Jinhang water-jets/hydraulic fracturing, improves reservoir permeability.
In order to further increase reservoir permeability, implements stimulation technology in main branch, carried out by using water-jet
On the one hand reservoir reconstruction can reduce the mechanical packing in conventional stage pressure break, realize hydraulic automatism packing, convenient for repeatedly continuous
The progress of construction.Another aspect water-jet increases preforation tunnel depth and seam space.It can be discharged by coal dust, it is real
Existing stress release, release achieve the purpose that improve reservoir permeability.Wherein suggest that water-jet is intersegmental away from for 30 ~ 50m, nozzle
Arrangement uses 180 ° of phase distributions, is advisable with 6/meter nozzles.It can be adjusted in practice of construction.Using pump, tubing string, injection
The equipment such as tool, nozzle, the specific method of injection and the condition of injection, such as hydraulic pressure 20-35MPa, the time is not less than 30 minutes, makes
Main branch and the effective unicom of branch.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (7)
1. a kind of ground region band coal mine gas extinction technique, which is characterized in that include the following steps：
A. according to reservoir characteristics and geologic feature, branched layout mode is carried out preferably；
B. according to resource potential evaluation result and rock stratum lithology, spatial, straight well well location is carried out preferred；
C. kickoff point (KOP) is carried out according to the data such as previous exploration and development data and coal mine exposure preferred；
D. according to coal seam reservoirs permeability characteristics and prediction area working face arrangement, branch parameter is carried out preferred；
E. according to reservoir characteristic, reservoir reconstruction technique is carried out preferred；
F. it after drilling equipment being transported to well site, is designed according to early period, starts straight well section drilling, basement rock or less design is deep when being drilled into
One is completed after degree and ends well, and wherein cementing concrete returns to ground, continues thereafter with drilling, when being drilled into pre- kickoff point (KOP), according to coring
As a result lithology and stratum characteristic are carried out sentencing knowledge, if meeting deflecting requirement starts deflecting, otherwise chooses kickoff point (KOP) again, and complete
Two open well cementation；
G. after completing deflecting, according to design requirement, main branch section drilling is completed, and be observed to the coal petrography heart, analyzed along main branch coal
Body structure change feature provides foundation, wherein three open without well cementing of cement for branch's kickoff point (KOP) selection；
H. after choosing kickoff point (KOP), continue drilling to projected depth, be sequentially completed branch's drilling；
I. main branch hydraulic jetting fracturing is completed according to FRACTURING DESIGN, is sequentially completed follow-up work；
J. it is designed according to mining and starts mining.
2. ground region band coal mine gas extinction technique according to claim 1, it is characterised in that：The step a
In, branched layout mode is preferred, be according to coal seam thickness and the coal seam number of plies, to the spatial relation of branch be arranged with it is excellent
Choosing, main Zhi Jingwei horizontal wells, Multilateral Wells use in the same direction with main branch well and are parallel to main branch well direction drilling；
For single coal bed；It is several using being carried out on main Zhi Jing when only carrying out extraction to the pre- Mining Area gas in side
Branch well drilling into；It is the same pressure system when both sides working face is at a distance of relatively close, and when reservoir geology condition is close, simultaneously
Extraction is carried out to both sides face gas, is crept into using a main branch well is carried out in same pit shaft both sides, on every main Zhi Jing
Carry out several branch well drillings into；
For two layers and two layers or more coal seam of development, spacing is smaller, and the similar region of reservoir conditions, and layer is closed using multilayer coal
The mode of mining；It is closer for two layers coal distance, and be suitble to close the region of layer mining, when Coal Pore Structure is complete, using same
One main branch well carries out the drilling of two layers of coal seam Multilateral Wells；It is larger and two for drilling out multiple branch's difficulty in horizontal segment simultaneously
The excessive region of layer coal spacing carries out deflecting using not existing together in same pit shaft respectively, is carried out two layers in two main branch wells respectively
The drilling of coal seam Multilateral Wells.
3. ground region band coal mine gas extinction technique according to claim 1, it is characterised in that：The step b
In, well location will consider formation stability when selecting, and far from tomography, karst collapse col umn and geological structure complex region, be convenient for kickoff point (KOP)
Determination.
4. ground region band coal mine gas extinction technique according to claim 1, it is characterised in that：The step c
In, kickoff point (KOP) it is preferred, be according to wellbore trace by rock stratum property, select to carry out deflecting, including master at the stabilization of layer position
The selection of the selection and Multilateral Wells kickoff point (KOP) of branch well kickoff point (KOP)；Selection for the kickoff point (KOP) of main Zhi Jing, to select layer position it is stable,
The preferable layer position of rock strength, avoids in mud stone, shale deflecting；Multilateral Wells kickoff point (KOP) is chosen, according to main branch drilling process
Middle coal petrography coring observation, selects to carry out the deflecting and drilling of Multilateral Wells in hard coal development area.
5. ground region band coal mine gas extinction technique according to claim 1, it is characterised in that：The step d
In, branch parameter optimization, be according to extraction period, reservoir permeability feature, reasonable Arrangement branch spacing, number of branches and point
Zhi Changdu；
In order to determine rational branch's spacing, reservoir permeability should be tested first, really according to reservoir permeability quality
Fixed rational branch's spacing can suitably increase branch's spacing for the preferable region of permeability, poor for permeability
Region, since reservoir gas migration resistance is larger, it should reduce the spacing of branch, reduce gas in the migration not being transformed in reservoir
Distance, branch's spacing are 15 ~ 45m；
The determination of number of branches is mainly according to branch's spacing and Ileal neobladder width, and branch's spacing is smaller, and number of branches is bigger,
Branch's spacing is bigger, and branch's number is smaller, and number of branches is 4 ~ 6；
For the coal dust in mining reservoir as possible, reservoir stress is made to be released, it should increase branch length as possible, still, point
Zhi Changdu is excessive, increases drilling well difficulty, and length is long that depth gas is caused to be difficult to migrate, so, branch length 600
~800m。
6. ground region band coal mine gas extinction technique according to claim 5, it is characterised in that：Between the branch
Away from for 20-30m.
7. ground region band coal mine gas extinction technique according to claim 1, it is characterised in that：The step e
In, according to reservoir characteristic, reservoir reconstruction technique is carried out preferred；Reservoir reconstruction technique is preferred, be according to reservoir characteristics selection with
Adaptable reservoir reconstruction technique, improve reservoir permeability, including water-jet transformation is carried out to main branch well；Wherein waterpower is sprayed
Penetrate intersegmental away from for 30 ~ 50m, arrangement of nozzles uses 180 ° of phase distributions, every meter of 4-5 nozzle, injection hydraulic pressure 20-35MPa, time
Not less than 30 minutes.
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