CN104696004B - Measurement method of extracting gas effective radius of boreholes based on content of residual gas - Google Patents
Measurement method of extracting gas effective radius of boreholes based on content of residual gas Download PDFInfo
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- CN104696004B CN104696004B CN201510049655.2A CN201510049655A CN104696004B CN 104696004 B CN104696004 B CN 104696004B CN 201510049655 A CN201510049655 A CN 201510049655A CN 104696004 B CN104696004 B CN 104696004B
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
Abstract
The invention relates to a measurement method of effective extracting radius of bedding boreholes based on the content of residual gas. The measurement method comprises a stepped measurement method of the content of residual gas and a grouping measurement method of the content of residual gas. The measurement method comprises the following steps: selecting districts which are simple in structure and stable in coal seam occurrence at districts to be pumped, and drilling holes; performing broaching and drilling on sampled drill holes so as to conform to stands of conventional bedding drill holes to be pumped; performing hole sealing and tube connecting extraction on drill holes to be pumped, continuously measuring extraction parameters, and after stable extraction is performed for 30 days, measuring the content of residual gas after extraction; repeating steps, measuring n groups of the content of residual gas; obtaining measurement results according to statistics, drawing a curve of results, and confirming the effective extracting radius. Through the adoption of the measurement method disclosed by the invention, the drilling difficulties are reduced, and the errors of measurement results are reduced, so that the measurement method is favorable for safety production of coal mines.
Description
Technical field
The invention belongs to Coal Mining Technology field, more particularly to a kind of hole pumping and mining gas based on gas remainder quantity
The method of testing of effective radius.
Background technology
1. hole pumping and mining gas effective radius definition
During down-hole drilling mash gas extraction, gas is under the driving force effect that gas pressure and extraction negative pressure are formed in coal seam
Migrated to drill center, the region influenceed by this driving force referred to as extraction coverage.Purpose according to hole pumping and mining gas is true
Fixed extraction coverage is hole pumping and mining gas effective radius,
If for protrusion-dispelling, coal-bed gas in extraction coverage should be made to lose excellent ability；
If in order to prevent gas density from transfiniting, should drop coal seam gas-bearing capacity or gas emission in extraction coverage
It is low to ventilation can be with the degree of safety dumping.
2. hole pumping and mining gas effect relevant regulations
《Preventing and treating coal and gas prominent regulation》To it is projecting coal bed it is pre- take out coal-bed gas regional effect check when explicitly point out should
When being leading indicator to take out the coal seam remnants gas pressures or gas remainder quantity in region in advance, critical value is with the prominent depth gas that begins
Pressure or gas bearing capacity are judging basis；Lack begin prominent depth gas pressure or gas bearing capacity data when, with remaining watt of coal seam
This pressure is judging basis less than 8m3/t less than 0.74MPa or gas remainder quantity.
《Coal mine gas drainage temporary provisions up to standard》And《Coal mine gas drainage basic index》Gas pre-drainage effect is made
Regulation：
1. gas emission mostlys come from the coal-face of mined bed, with coal in the 20m range above of working face front
Can coal seams gas discharging quantity as judging quota, table 1 should be met and specified.
2. for projecting coal bed, using coal seam remnants gas pressures or gas remainder quantity as judging quota；Protrusion-dispelling effect
Gas pressure up to standard or gas bearing capacity press the gas pressure or gas bearing capacity value of coal seam beginning prominent depth；Without investigation coal output layer
When the coal-bed gas pressure or content of beginning prominent depth, respectively according to 0.74MPa, 8m3/ t values.
3. gas emission mostlys come from projecting coal bed coal-face, need to meet simultaneously 1., 2., can judge this
It is up to standard that face gas take out effect in advance.
4. gas emission mostlys come from the coal-face of adjacent layer or country rock, is referred to as judge using gas pumping rate
Mark, should meet table 2 and specify.
Coal can the index that should reach of coal seams gas discharging quantity before the coal-face back production of table 1
The index that the coal-face gas pumping rate of table 2 should reach
《Gas discharge in mine specification》Specify from gas sucrose extraction and drilling amount to taking out coal-bed gas in advance：
1. the mine of coal-bed gas is taken out in advance, and mine sucrose extraction should be not less than 20%, and stope sucrose extraction is not less than
25%；Projecting mine, after taking out coal-bed gas in advance, projecting coal bed gas bearing capacity should be less than the primitive coalbed of coal seam beginning prominent depth
Coal-bed gas pressure is dropped to 0.74MPa by gas bearing capacity；
When 2. using concordant drilling-draining, drilling amount should meet table 3.
3 tons of coal borer hole scales of table
《Safety regulations in coal mine》190th article of regulation：After taking out coal-bed gas in advance, it is necessary to Gas pre-drainage is prevented and treated and is protruded
Effect is tested, and its Validity Index should determine according to mine field data.Such as without measured data, can according to following index it
One determines：
1. after taking out coal-bed gas in advance, projecting coal bed gas remainder quantity contains less than the original gas of coal seam beginning prominent depth
Amount.
1. the pre- pumping rate of coal-bed gas is more than 30%.
3. the selection of hole pumping and mining gas effective radius agriculture products
According to the analysis of hole pumping and mining gas effect relevant regulations and code, mainly from the remaining gas pressure in coal seam, coal seam
Gas remainder quantity and the aspect of pre- pumping rate three carry out extracting result evaluation, and the relation that three meets is：
In formula, η is gas pre-drainage rate, %；QcIt is gas remainder quantity, m3/t；Q is original gas bearing capacity, m3/t；pcFor
Remaining gas pressure, MPa；P is original gas pressure, MPa；α is coal seam gas-bearing capacity coefficient, m3/(t·MPa1/2)。
In actual production utilization, in order to reach preferable extracting result, it is contemplated that the effective extraction segment length of concordant drilling, one
As exploiting field large area administer gas first-selected pumping method.Under normal circumstances, coal seam with gas compares with respect to rock mass
It is relatively soft, and drilling influenceed by unloading blast, concordant drilling and sealing is big compared with layer-through drilling sealing of hole degree-of-difficulty factor, seals for a long time
Hole is of poor quality.Therefore, general determination of coal seam gas pressure method is used in concordant drilling, it is difficult to determine accurate coal seam watt
This pressure, especially in the case where extraction negative pressure and drilling influence each other, evaluated error is bigger.If conversely, avoid sealing of hole influence and
Influencing each other between drilling, evaluated error will be relatively reduced.Therefore, take out coal-bed gas investigation in advance in concordant drilling takes out effect in advance
When can using determine coal seam gas remainder quantity method.
Hole pumping and mining gas effective radius is determined according to the purpose of hole pumping and mining gas, and its essence is also pre- to take out effect
Judge index, therefore, determine that hole pumping and mining gas effective radius is feasible with remaining gas bearing capacity.
1. with gas remainder quantity 8m3/ t is used as judging quota, Qc1=8m3/t；
2. it is more than 30% as judging quota, Q using pre- pumping ratec2=Q × (1- η)=0.7Q；
3. the coal-face of mined bed is mostly come from gas emission, can coal seams gas discharging quantity Q with remnantsckjAs
Judging quota, Qc3=Qckj+Qbj；Wherein QbjFor normal temperature can not desorbing mash gas content, using Langmuir formula calculate.
4. the coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as commenting
Sentence index, Qc4=Q × (1- η).
In sum, the purpose that hole pumping and mining gas effective radius reaches according to extraction, should choose four kinds of situations of the above most
Low gas remainder quantity index, i.e. Qc=min (Qc1, Qc2, Qc3, Qc4)。
The content of the invention
The purpose of the present invention：A kind of concordant effective extraction radius determination method of drilling based on gas remainder quantity is provided,
Solve defect of the prior art.
In order to solve the above problems, the technical scheme is that：A kind of concordant drilling based on gas remainder quantity has
Effect extraction radius determination method, including staged gas remainder quantity determination method and packet gas remainder quantity determination method, its scala media
Ladder type gas remainder quantity determination method comprises the following steps：
(1) region is taken out pre-, chooses simple structure, ocurrence of coal seam stability region and press《Coal seam gas-bearing capacity underground is directly surveyed
Determine method》Construction drill A, vertical rib construction, diameter 42mm；Coal-bed gas are measured by sampling every 2~3m after 15m is crept into contain
Amount, at least determines 3 groups of data (Q 1, Q 2, Q 3 ...), takes its average value equal as average gas bearing capacity Q before pre- taking out；
(2) to the bore expanded hole after sampling, drilling, to reach conventional concordant pre-draining borehole specification；
(3) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to pre-draining borehole A, single hole is calculated
Gas pumping scale=extraction flow × extraction concentration, used as investigating, " same extraction time gas remainder quantity is with the spacing of wells
Change curve " fitting accuracy reference；After extraction is stablized 30 days, at grade, at drilling A about 5m, press
《Coal seam gas-bearing capacity underground Direct Determination》Drilling A ' is investigated in construction, investigates 10 ° of drilling A ' and pre-draining borehole A angles, when
Drilling depth investigates the gas remainder quantity of drilling A ' more than measure is started after 16m, is measured by sampling every 2~3m and rear remnants take out in advance
Gas bearing capacity, at least determines 3 groups of data (Q c1, Q c2, Q c3 ...)；
(4) repeat step (1), (2), (3), construct extraction borehole B, C ..., and investigates drilling B ', C ' ..., investigates pre-
Take out 60 days, 90 days ... extracting results；
(5) the result according to the form below that will be determined counts the spacing of wells
Using gas remainder quantity 8m 3/t as judging quota, Q cL1=8m 3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q is equal；
Gas emission mostlys come from the coal-face of mined bed, using remnants can coal seams gas discharging quantity Q ckj as commenting
Sentence index, Q cL3=Q ckj+Q bj, wherein Q bj be normal temperature can not desorbing mash gas content, calculated using Langmuir formula；,
According to table 1, Qckj, Q cL3=Q ckj+Qbj are determined by the actual daily output of working face；
The coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as judge
Index, according to table 2, working face extraction rate η, Q cL4=Q × (1- η)=Q are determined by the actual absolute gas emission rate of working face
× (1- η)；
The purpose that hole pumping and mining gas effective radius reaches according to extraction, chooses the minimum remaining gas of four kinds of situations above
Content's index, i.e. Q cL=min (Q cL1, Q cL2, Q cL3, Q cL4)；
Draw same extraction time gas remainder quantity with the change curve (T1, T2, T3 ...) of the spacing of wells and effectively
Extraction radius with the extraction time change curve, as shown in Figure 2.
The actual conditions of combination mensuration mine, and Q cL, make straight line Q cL in Fig. 2 (a), respectively with curve (T1,
T2, T3 ...) it is intersecting, the spacing of wells (d1, d2, d3 ...) is exactly correspondence extraction time (T1, T2, T3 ...) effectively extraction half
Footpath.The change curve of the different extraction time effective extraction radiuses of drafting in Fig. 2 (b), the excavation replacement plan according to mine, really
It is fixed effectively to take out phase T in advance, and then determine corresponding effectively extraction radius d.
When hole pumping and mining gas effective radius is determined in compared with soft seam, constructing, oblique drilling difficulty of investigating is big, takes coal
Sample difficulty is big, can be comprised the following steps using packet gas remainder quantity determination method, packet gas remainder quantity determination method：
(1) taking out region pre-, choosing simple structure, ocurrence of coal seam stability region, same level high perpendicular rib according to
Minor tick different distance, can be by 2m, 3m, 4m, 5m according to gas bearing situation ... arranges one group of conventional extraction borehole；
(2) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to this group of extraction borehole.Extraction
30 days, 60 days, 90 days ..., press《Coal seam gas-bearing capacity underground Direct Determination》, applied in the middle of this group of extraction borehole successively
Work investigates drilling 1 ', 2 ', 3 ', 4 ', and measure takes out rear gas remainder quantity (Q c1, Q c2, Q c3, Q c4) in advance；
(3) changed with time to investigate extraction, can be with residual after the arrangement n group measure of repeat step 1, the 2 different extraction times
Remaining gas bearing capacity；
(4) the result according to the form below statistics that will be determined：
Using gas remainder quantity 8m 3/t as judging quota, Q cL1=8m 3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q is equal；Q can use coal before extraction
Layer original gas bearing capacity, can also be determined by the step in staged determination method；
Mostly come from the coal-face of mined bed in gas emission, using remnants can coal seams gas discharging quantity Q ckj as
Judging quota, Q cL3=Q ckj+Q bj, wherein Q bj be normal temperature can not desorbing mash gas content, using Langmuir formula meter
Calculate；, according to table 1, Qckj, Q cL3=Q ckj+Qbj are determined by the actual daily output of working face；
The coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as judge
Index, Q cL4=Q × (1- η)=Q is × (1- η)；, according to table 2, work is determined by the actual absolute gas emission rate of working face
Face extraction rate η, Q cL4=Q × (1- η)=Q is × (1- η)；
The purpose that hole pumping and mining gas effective radius reaches according to extraction, chooses the minimum remaining gas of four kinds of situations above
Content's index, i.e. Q cL=min (Q cL1, Q cL2, Q cL3, Q cL4)；
Draw same extraction time gas remainder quantity with the change curve (T1, T2, T3 ...) of the spacing of wells and effectively
Extraction radius with the extraction time change curve, as shown in Figure 4.
The actual conditions of combination mensuration mine, and Q cL, make straight line Q cL in Fig. 4 (a), respectively with curve (T1,
T2, T3 ...) it is intersecting, the spacing of wells (d1, d2, d3 ...) is exactly correspondence extraction time (T1, T2, T3 ...) effectively extraction half
Footpath.The change curve of the different extraction time effective extraction radiuses of drafting in Fig. 4 (b), the excavation replacement plan according to mine, really
It is fixed effectively to take out phase T in advance, and then determine corresponding effectively extraction radius d.
Agriculture products Q cL, draw same extraction time gas remainder quantity with the change curve of the spacing of wells and effectively take out
Change curve of the radius with the extraction time is adopted,
Excavation replacement plan according to mine, it is determined that effectively taking out phase T in advance, and then determines corresponding effectively extraction radius d.
The step of staged gas remainder quantity determination method in (3), the chosen position of measuring point should be according in construction drill A
When determine the position of coal seam gas-bearing capacity and determine, keep as far as possible on the same plane.
Beneficial effects of the present invention：A kind of concordant effective extraction radius of drilling based on gas remainder quantity of the invention
Assay method, can select staged gas remainder quantity determination method or packet gas remainder quantity to survey according to the concrete condition in colliery
Determine method, reduce drilling difficulty, reduce measurement result error, be conducive to the safety in production in colliery.
Brief description of the drawings
Fig. 1 is staged gas remainder quantity determination method site operation schematic diagram；
Fig. 2 is staged gas remainder quantity determination method result curve；
Fig. 3 is packet gas remainder quantity determination method site operation schematic diagram；
Fig. 4 is packet gas remainder quantity determination method result curve.
Specific embodiment
A kind of concordant effective extraction radius determination method of drilling based on gas remainder quantity, including staged remnants gas contains
Amount determination method and packet gas remainder quantity determination method.
The staged gas remainder quantity determination method of embodiment 1
(1) region is taken out pre-, chooses simple structure, ocurrence of coal seam stability region and press《Coal seam gas-bearing capacity underground is directly surveyed
Determine method》Construction drill A, vertical rib construction, diameter 42mm；Coal-bed gas are measured by sampling every 2~3m after 15m is crept into contain
Amount, at least determines 3 groups of data (Q1、Q2、Q3...), its average value is taken as average gas bearing capacity Q before pre- taking out；Research shows：
Rib release drainage scope is 10~15m, and the gas bearing capacity determined in the range of release drainage is relatively low；Meanwhile,《Coal seam gas-bearing capacity underground
Direct Determination》Regulation：When getting working face is measured by sampling gas bearing capacity, sampling depth is no less than 12m.Therefore, it is
Accurate Determining gas remainder quantity, usual drilling depth is determined more than after 15m.
(2) to the bore expanded hole after sampling, drilling, to reach conventional concordant pre-draining borehole specification；
(3) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to pre-draining borehole A, single hole is calculated
Gas pumping scale=extraction flow × extraction concentration, can as investigate " same extraction time gas remainder quantity is between drilling
Away from change curve " fitting accuracy reference.After extraction is stablized 30 days, at grade, at drilling A about 5m,
Press《Coal seam gas-bearing capacity underground Direct Determination》Drilling A ' is investigated in construction, investigates 10 ° of drilling A ' and pre-draining borehole A angles,
As shown in Figure 1.When drilling depth is more than 16m (drill 10 ° of A ' and A angles, then L '=15/cos10 °=15.23m), that is, exceed
During sealing of hole sections, every 2~3m, (substantially two kinds of run of steel used by colliery scene, 1m/ roots or 1.5m/ roots, measuring interval is 2
Root run of steel, as 2m or 3m) extraction gas remainder quantity is measured by sampling, at least determine 3 groups of data (Qc1、Qc2、
Qc3……).The position that measuring point is chosen herein, should determine, to the greatest extent according to the position that coal seam gas-bearing capacity is determined in construction drill A
Amount keeps on the same plane.According to Qc1、Qc2、Qc3... determine curve T1, T1The measure numerical value correspondence of A drillings during for extraction 30 days
Curve.
(4) repeat step (1), (2), (3), construct extraction borehole B, C ..., and investigates drilling B ', C ' ..., can investigate
60 days, 90 days ... extracting results are taken out in advance, T is determined2、T3... respectively extraction 60 days, 90 days ... when B, C ... drilling
The corresponding curve of numerical value is determined, with this determination 60 days, 90 days ... corresponding effective extraction radiuses.
(5) the result according to the form below that will be determined counts the spacing of wells
Using gas remainder quantity 8m 3/t as judging quota, Q cL1=8m 3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q is equal；
Gas emission mostlys come from the coal-face of mined bed, using remnants can coal seams gas discharging quantity Q ckj as commenting
Sentence index, Q cL3=Q ckj+Q bj, wherein Q bj be normal temperature can not desorbing mash gas content, calculated using Langmuir formula；,
According to table 1, Qckj, Q cL3=Q ckj+Qbj are determined by the actual daily output of working face；
The coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as judge
Index, according to table 2, working face extraction rate η, Q cL4=Q × (1- η)=Q are determined by the actual absolute gas emission rate of working face
× (1- η)；
The purpose that hole pumping and mining gas effective radius reaches according to extraction, chooses the minimum remaining gas of four kinds of situations above
Content's index, i.e. Q cL=min (Q cL1, Q cL2, Q cL3, Q cL4)；
Draw same extraction time gas remainder quantity with the change curve (T1, T2, T3 ...) of the spacing of wells and effectively
Extraction radius with the extraction time change curve, as shown in Figure 2.
The actual conditions of combination mensuration mine, and Q cL, make straight line Q cL in Fig. 2 (a), respectively with curve (T1,
T2, T3 ...) it is intersecting, the spacing of wells (d1, d2, d3 ...) is exactly correspondence extraction time (T1, T2, T3 ...) effectively extraction half
Footpath.The change curve of the different extraction time effective extraction radiuses of drafting in Fig. 2 (b), the excavation replacement plan according to mine, really
It is fixed effectively to take out phase T in advance, and then determine corresponding effectively extraction radius d.
When hole pumping and mining gas effective radius is determined in compared with soft seam, constructing, oblique drilling difficulty of investigating is big, takes coal
Sample difficulty is big, can be comprised the following steps using packet gas remainder quantity determination method, packet gas remainder quantity determination method：
(1) taking out region pre-, choosing simple structure, ocurrence of coal seam stability region, same level high perpendicular rib according to
Minor tick different distance, can be by 2m, 3m, 4m, 5m according to gas bearing situation ... arranges one group of conventional extraction borehole；
(2) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to this group of extraction borehole.Extraction
After a period of time, press《Coal seam gas-bearing capacity underground Direct Determination》, construct to investigate successively in the middle of this group of extraction borehole and bore
Hole 1 ', 2 ', 3 ', 4 ', as shown in figure 3, determining gas remainder quantity (Q after extractionc1、Qc2、Qc3、Qc4), determined according to surveyed data
T1, T1First group of corresponding curve of measure numerical value of drilling during for extraction 30 days；
(3) changed with time to investigate extraction, can be with residual after the arrangement n group measure of repeat step 1, the 2 different extraction times
Remaining gas bearing capacity, determines T2、T3... respectively extraction 60 days, 90 days ... when the 2nd group, the 3rd group ... the measure number of drilling
It is worth corresponding curve, with this determination 60 days, 90 days ... corresponding effective extraction radiuses.
(4) the result according to the form below statistics that will be determined：
With gas remainder quantity 8m3/ t is used as judging quota, Q cL1=8m3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q；
The coal-face of mined bed is mostly come from gas emission, can coal seams gas discharging quantity Q with remnantsckjAs commenting
Sentence index, wherein QbjFor normal temperature can not desorbing mash gas content, calculated by experimental determination or using Langmuir formula, according to table
1, Q is determined by the actual daily output of working faceckj, Q cL3=Qckj+Qbj；
The coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as judge
Index, according to table 2, working face extraction rate η, Q cL is determined by the actual absolute gas emission rate of working face4=Q × (1- η)=Q
×(1-η)；
The purpose that hole pumping and mining gas effective radius reaches according to extraction, chooses the minimum remaining gas of four kinds of situations above
Content's index, i.e. Q cL=min (Qcl1, Q cL2, Q cL3, Q cL4)。
Draw change curve (T of the same extraction time gas remainder quantity with the spacing of wells1、T2、T3...) and effectively take out
Change curve of the radius with the extraction time is adopted, as shown in Figure 2.
The actual conditions of combination mensuration mine, and Q cL, make straight line Q cL in Fig. 2 (a), respectively with curve (T1、T2、
T3...) intersecting, the spacing of wells (d1、d2、d3...) it is exactly the correspondence extraction time (T1、T2、T3...) effective extraction radius.
The change curve of different extraction time effective extraction radiuses, the excavation replacement plan according to mine, it is determined that having are drawn in Fig. 2 (b)
Effect is pre- to take out phase T, and then determines corresponding effectively extraction radius d.
Embodiment 2 is grouped gas remainder quantity determination method
When hole pumping and mining gas effective radius is determined in compared with soft seam, constructing, oblique drilling difficulty of investigating is big, takes coal
Sample difficulty is big, can be using packet gas remainder quantity determination method, its step：
(1) taking out region pre-, choosing simple structure, ocurrence of coal seam stability region, same level high perpendicular rib according to
Minor tick different distance, can be by 2m, 3m, 4m, 5m according to gas bearing situation ... arranges one group of conventional extraction borehole；
(2) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to this group of extraction borehole.Extraction
After a period of time, press《Coal seam gas-bearing capacity underground Direct Determination》, construct to investigate successively in the middle of this group of extraction borehole and bore
Hole 1 ', 2 ', 3 ', 4 ', as shown in figure 3, determining gas remainder quantity (Q after extractionc1、Qc2、Qc3、Qc4), determined according to surveyed data
T1, T1First group of corresponding curve of measure numerical value of drilling during for extraction 30 days；
(3) changed with time to investigate extraction, can be with residual after the arrangement n group measure of repeat step 1, the 2 different extraction times
Remaining gas bearing capacity, determines T2、T3... respectively extraction 60 days, 90 days ... when the 2nd group, the 3rd group ... the measure number of drilling
It is worth corresponding curve, with this determination 60 days, 90 days ... corresponding effective extraction radiuses.
(4) the result according to the form below statistics for determining
With gas remainder quantity 8m3/ t is used as judging quota, Q cL1=8m3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q, QThe desirable preceding coal seam of extraction
Original gas bearing capacity, can also be determined by the step in staged determination method；
The coal-face of mined bed is mostly come from gas emission, can coal seams gas discharging quantity Q with remnantsckjAs commenting
Sentence index, wherein QbjFor normal temperature can not desorbing mash gas content, calculated by experimental determination or using Langmuir formula, according to table
1, Q is determined by the actual daily output of working faceckj, Q cL3=Qckj+Qbj；
The coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as judge
Refer to, according to table 2, working face extraction rate η, Q cL are determined by the actual absolute gas emission rate of working face4=Q × (1- η)=Q×
(1-η)；
The purpose that hole pumping and mining gas effective radius reaches according to extraction, chooses the minimum remaining gas of four kinds of situations above
Content's index, i.e. Q cL=min (Qcl1, Q cL2, Q cL3, Q cL4)；
Draw change curve (T of the same extraction time gas remainder quantity with the spacing of wells1、T2、T3...) and effectively take out
Change curve of the radius with the extraction time is adopted, as shown in Figure 4.
The actual conditions of combination mensuration mine, and Q cL, make straight line Q cL in Fig. 4 (a), respectively with curve (T1、T2、
T3...) intersecting, the spacing of wells (d1、d2、d3...) it is exactly the correspondence extraction time (T1、T2、T3...) effective extraction radius.
The change curve of different extraction time effective extraction radiuses, the excavation replacement meter according to mine are drawn in Fig. 4 (b)
Draw, it is determined that effectively taking out phase T in advance, and then determine corresponding effectively extraction radius d.
Claims (2)
1. a kind of concordant based on gas remainder quantity drills effective extraction radius determination method, it is characterised in that：Including staged
Gas remainder quantity determination method and packet gas remainder quantity determination method, wherein staged gas remainder quantity determination method are included such as
Lower step：
(1) region is taken out pre-, chooses simple structure, ocurrence of coal seam stability region and press《The direct side of measure in coal seam gas-bearing capacity underground
Method》Construction drill A, vertical rib construction, diameter 42mm；Coal seam gas-bearing capacity is measured by sampling every 2~3m after 15m is crept into,
3 groups of data (Q1, Q2, Q3 ...) are at least determined, its average value is taken equal as average gas bearing capacity Q before pre- taking out；
(2) to the bore expanded hole after sampling, drilling, to reach conventional concordant pre-draining borehole specification；
(3) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to pre-draining borehole A, single hole gas is calculated
Extraction scale=extraction flow × extraction concentration, as investigate " same extraction time gas remainder quantity with the spacing of wells change
Change curve " it is fitted the reference of accuracy；After extraction is stablized 30 days, at grade, at drilling A5m, press《Coal-bed gas
Content underground Direct Determination》Drilling A ' is investigated in construction, investigates 10 ° of drilling A ' and pre-draining borehole A angles, when drilling depth is super
Start to determine the gas remainder quantity for investigating drilling A ' after crossing 16m, be measured by sampling every 2~3m and take out rear gas remainder quantity in advance,
At least determine 3 groups of data (Qc1, Qc2, Qc3 ...)；
(4) repeat step (1), (2), (3), construct extraction borehole B, C ..., and investigates drilling B ', C ' ..., and investigation takes out 60 in advance
My god, 90 days ... extracting results；
(5) the result according to the form below that will be determined counts the spacing of wells
Using gas remainder quantity 8m3/t as judging quota, QcL1=8m3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q is equal；
Gas emission mostlys come from the coal-face of mined bed, using remnants can coal seams gas discharging quantity Q ckj refer to as judge
Mark, Q cL3=Q ckj+Q bj, wherein Q bj be normal temperature can not desorbing mash gas content, calculated using Langmuir formula；
The coal-face of adjacent layer or country rock is mostly come to gas emission, using gas pumping rate η as judging quota,
QcL4=Q × (1- η)=Q is × (1- η)；
The purpose that hole pumping and mining gas effective radius reaches according to extraction, chooses the minimum gas remainder quantity of four kinds of situations above
Index, i.e. Q cL=min (Q cL1, QcL2, QcL3, Q cL4)；Agriculture products QcL, draws same extraction time remnants gas
Content with the spacing of wells change curve and effective extraction radius with the extraction time change curve, according to the excavation replacement of mine
Plan, it is determined that effectively taking out phase T in advance, and then determines corresponding effectively extraction radius d；
When hole pumping and mining gas effective radius is determined in compared with soft seam, constructing, oblique drilling difficulty of investigating is big, takes coal sample difficult
Degree is big, and using packet gas remainder quantity determination method, packet gas remainder quantity determination method comprises the following steps：
(1) taking out region pre-, choosing simple structure, ocurrence of coal seam stability region, same level high perpendicular rib successively between
Every different distance, one group of conventional extraction borehole can be by 2m, 3m, 4m, 5m according to gas bearing situation ... be arranged；
(2) sealing of hole, union extraction, and METHOD FOR CONTINUOUS DETERMINATION extraction concentration and extraction flow are carried out to this group of extraction borehole；Extraction 30 days,
60 days, 90 days ..., press《Coal seam gas-bearing capacity underground Direct Determination》, constructed in the middle of this group of extraction borehole investigate successively
Drilling 1 ', 2 ', 3 ', 4 ', measure takes out rear gas remainder quantity (Q c1, Q c2, Q c3, Q c4) in advance；
(3) changed with time to investigate extraction, the arrangement n groups of repeat step 1,2 determine the gas of remnants after the different extraction times
Content；
(4) the result according to the form below statistics that will be determined：
Using gas remainder quantity 8m 3/t as judging quota, Q cL1=8m 3/t；
Using pre- pumping rate more than 30% as judging quota, Q cL2=Q × (1- η)=0.7Q is equal；
Mostly come from the coal-face of mined bed in gas emission, using remnants can coal seams gas discharging quantity Q ckj as judge
Index, Q cL3=Q ckj+Q bj, wherein Q bj be normal temperature can not desorbing mash gas content, calculated using Langmuir formula；To watt
This outburst amount mostlys come from the coal-face of adjacent layer or country rock, using gas pumping rate η as judging quota, Q cL4=Q
× (1- η)=Q are × (1- η)；The purpose that hole pumping and mining gas effective radius reaches according to extraction, more than selection four kinds of situations are most
Low gas remainder quantity index, i.e. Q cL=min (Q cL1, Q cL2, Q cL3, Q cL4)；
Agriculture products Q cL, draw same extraction time gas remainder quantity with the change curve of the spacing of wells and effective extraction half
Footpath with the extraction time change curve, the excavation replacement plan according to mine it is determined that effectively taking out phase T in advance, and then determines corresponding
Effective extraction radius d.
2. a kind of concordant based on gas remainder quantity as claimed in claim 1 drills effective extraction radius determination method, and it is special
Levy and be：The step of staged gas remainder quantity determination method in (3), the chosen position of measuring point should be according in construction drill A
When determine the position of coal seam gas-bearing capacity and determine, keep as far as possible on the same plane.
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| CN106437823B (en) * | 2015-08-12 | 2020-02-14 | 陈信平 | Method for eliminating outburst and standard exceeding of coal mine gas explosion |
| CN105134169B (en) * | 2015-10-10 | 2017-12-01 | 中煤科工集团重庆研究院有限公司 | A kind of method using gas pumping continuous data mensuration region gas pumping radius |
| CN105550769A (en) * | 2015-12-09 | 2016-05-04 | 贵州省矿山安全科学研究院 | Dynamic prediction method for residual gas content distribution after coal seam pre-pumping |
| CN106246141B (en) * | 2016-08-03 | 2019-10-22 | 中煤科工集团重庆研究院有限公司 | Drilling based on coal mine gas drainage capability forecasting quantifies subregion optimizing method for disposing |
| CN106503357B (en) * | 2016-11-02 | 2019-07-05 | 河南理工大学 | Method based on the effective extraction radius of layer-through drilling Gas characteristic measurement |
| CN107130997B (en) * | 2017-06-28 | 2023-08-18 | 中国矿业大学(北京) | Technical method for mining bedding drilling and extracting pressure relief gas on working face of unequal length protective layer |
| CN107130996B (en) * | 2017-06-28 | 2023-08-18 | 中国矿业大学(北京) | Technical method for mining through-layer drilling and pressure relief gas extraction of non-equilong protective layer working face |
| CN109779610B (en) * | 2019-02-01 | 2022-09-06 | 西安闪光能源科技有限公司 | Method for measuring effective action radius of anti-reflection drilling hole based on controllable shock wave technology |
| CN110630318B (en) * | 2019-10-22 | 2021-01-26 | 中煤科工集团重庆研究院有限公司 | Full life cycle control method for underground gas drilling extraction |
| CN113123785B (en) * | 2021-03-18 | 2022-06-21 | 太原理工大学 | Method for measuring and calculating standard effective extraction radius of coal mine gas extraction |
| CN113719255B (en) * | 2021-09-17 | 2023-03-24 | 河南理工大学 | Gas extraction and hole sealing method for directional long-drilled-hole fractured zone at top |
| CN114165276A (en) * | 2021-12-08 | 2022-03-11 | 中煤科工集团重庆研究院有限公司 | Method for pre-pumping large-area coal seam gas in underground coal mine area |
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