CN104295289B - Gas extraction radius determining method for strike long drilled hole - Google Patents
Gas extraction radius determining method for strike long drilled hole Download PDFInfo
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- CN104295289B CN104295289B CN201410400097.5A CN201410400097A CN104295289B CN 104295289 B CN104295289 B CN 104295289B CN 201410400097 A CN201410400097 A CN 201410400097A CN 104295289 B CN104295289 B CN 104295289B
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- long drill
- strike long
- peephole
- strike
- gas pumping
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention discloses a gas extraction radius determining method for a strike long drilled hole. The gas extraction radius determining method for the strike long drilled hole comprises the following steps that (1) at least one strike long drilled hole is formed in a constructed coal bed; (2) an observation point G[1] is arranged on one side of a lane; (3) an observation hole G[1]K[1] is formed at the position of the observation point G[1], and a negative pressure meter G[1]K[1]B[1] is installed; (4) whether the pressure value on the negative pressure meter G[1]K[1]B[1] drops to a required value P[0] is judged through observation till the pressure value on a negative pressure meter G[1]K[n]B[n] drops below the required value P[0]; (5) the step (3) is executed, an observation hole G[1]K[n+1] is formed at the position of the observation point G[1], and whether the pressure value on a negative pressure meter G[1]K[n+1]B[n+1] drops below the required value P[0] is judged through observation till the pressure value on a negative pressure meter G[1]K[n+m]B[n+m] does not drop below the required value P[0]; (6) it is determined that the gas extraction radius R of the strike long drilled hole formed in the position of the observation point G[1] ranges from G[1]K[n]H[n] to G[1]K[n+m]H[n+m]. According to the gas extraction radius determining method for the strike long drilled hole, the defects of a traditional gas extraction radius determining method for a drilled hole are overcome, and a novel scientific, efficient, accurate and low-cost method is provided for determining the gas extraction radius of a strike long drilled hole.
Description
Technical field
The present invention relates to coal mine drilling gas pumping radius technical field, more particularly to a kind of strike long drill gas pumping
Radius assay method.
Background technology
The selection of the gas pumping radius of traditional this coal seam, adjacent layer, release drainage and concordant mash gas pumping drilling is often
Based on experience, seldom carry out in detail, scientifically investigating, cause mash gas pumping drilling line space design unreasonable.In high methane
Mine or coal, because the design of gas pumping radius is unreasonable, often result in coal seam during extraction with projecting mine, or
Exist because the spacing of wells is excessive it is substantial amounts of do not take out region (i.e. blank tape), cause extracting result bad；Due between drilling
Cause that drilling construction quantities is excessive, extraction cost is increased sharply away from too small.
Traditional gas pumping radius assay method generally using pressure decline method or discharge method, also tested tracer gas technique.
These methods have played very big effect in the regular period, but pressure decline method or discharge method are all first after the completion of drilling construction
Ma Lisan sealing of hole is carried out, then opening extraction borehole valve carries out extraction, finally the long-term of relevant parameter is carried out to observation drilling
Observation, has been ignored as among these the integrity that excessive drilling construction destroys coal body, so as to increased between the drilling of interval
Gas permeability of coal seam, causes result of the test inaccurate；SF6 search gass are a kind of artificial noble gases, and mining industry is commonly used for instead
Adsorbent, does not replace with CH4 of the absorption in coal body, and gas chance gap may pass through.Gas pumping half is surveyed with the method
Footpath has the shortcomings that one very big is exactly：SF6 search gass methods of testing are qualitatively things, as long as with the presence of crack in coal body,
Passage two ends of leaking out exist under conditions of pressure reduction and will detect SF6 search gass by mash gas pumping drilling, and SF6 spike gas
Body detection level is how many whens, is defined as the effective radius of influence of gas pumping but without quantitative standard.
For the research comparative maturity of the gas pumping radius for being inclined to general drilling in prior art, but for moving towards jumping chisel
The measuring method of the gas pumping effective radius in hole at present in the research field or a blank because some strike long drills
The hole depth of single hole is very long, and is not easy practical operation to the test and comparison of its effective radius of influence.
Traditional relative gas pressure measurement method, absolute gas pressure measurement method, gas bearing capacity algoscopy, SF6 spike gas
Body measurement method, set up gas drilling flow equation algoscopy and can not mechanically indiscriminately imitate strike long drill gas pumping radius
Measure gets on because the several parallel strike long drills of arrangement not only construct, research cycle it is long, and construction cost is very high,
Enterprise cannot bear；Gas loss during in addition long construction period is also resulted in and drilled causes test result inaccurate, unreliable.
At present both at home and abroad academia is directed to the measure aspect of strike long drill extraction radius also without a kind of ripe method
To be measured, the cloth hole for causing strike long drill is designed with blindness and randomness.During implementing strike long drill
Due to without the gas pumping radius for scientifically investigating strike long drill, so being unable to science, reasonably determining strike long drill
The spacing of wells, simply by virtue of the conventional empirically determined spacing of wells be 20m when causing construction strike long drill, as a result cause
Even if other work surface strike long drill is all constructed finish, and the extraction phase reaches more than 2 years, but due to extraction spacing mistake
There are many clear areas greatly, multiple gas exceeding limit is caused during coal mining, it is necessary to take complement mash gas pumping drilling again, or even adopt
Supplement measure to remedy with pump drainage blower fan, goaf pipe laying extraction etc., not only expend substantial amounts of man power and material, also exist a lot
Potential safety hazard.
The content of the invention
The goal of the invention of the present invention is to overcome defect of the prior art, there is provided a kind of construction work amount is few, construction work
Skill is simple, expense is low, according to actual conditions multiple observation stations can be selected to carry out test observation, and it is accurate that gas pumping radius is determined
The higher strike long drill gas pumping radius assay method of degree.
A kind of strike long drill gas pumping radius assay method that technical solution of the present invention is provided, comprises the steps：
Step 1：At least one strike long drill is opened up in construction coal；Step 2：Observation station G is offered on lane side1, step
Rapid 3：In observation station G1Place opens up peephole G1K1, and the peephole G1K1Arrange perpendicular to the strike long drill, institute
State peephole G1K1End away near the lane side side the strike long drill distance be G1K1H1, and in the peephole
G1K1On vacuum table G is installed1K1B1；Step 4：Observe the vacuum table G1K1B1On pressure change, the peephole G1K1It is interior
Original methane gas pressure value is P, and Jing after observation cycle T, observes the vacuum table G1K1B1On pressure whether drop to institute
Need to value P0；Step 41：Such as the vacuum table G1K1B1Desirable value P is not dropped to0, then repeat in observation station G1Place opens up observation
Hole, and the action of repeat the above steps 3 and step 4, until in observation station G1The peephole G that place opens up1KnOn vacuum table
G1KnBnDesirable value P is depressurized to Jing after observation cycle T0Under, now, the peephole G1KnEnd away near the lane side side
The strike long drill distance be G1KnHn, and, G1KnHnLess than G1Kn-1Hn-1(wherein n is the natural number more than or equal to 2)；
Step 5：The action of execution step 3 again, in observation station G1The peephole G that place opens up1Kn+1, and the action of execution step 4, see
Examine peephole G1Kn+1On the vacuum table G1Kn+1Bn+1, desirable value P whether is depressurized to Jing after observation cycle T0Under, step
51：Such as the vacuum table G1Kn+1Bn+1On methane gas pressure drop to desirable value P0Under, then repeat in observation station G1Place
Peephole, and the action of repeat the above steps 3 and step 4 are opened up, directly in observation station G1The peephole G that place opens up1Kn+mOn
Vacuum table G1Kn+mBn+mDesirable value P is not depressurized to Jing after observation cycle T0Under, now, the peephole G1Kn+mEnd
Distance away from the strike long drill near the lane side side is G1Kn+mHn+m, and, G1KnHnLess than G1Kn+mHn+m(wherein m is
Natural number more than or equal to 1)；Step 6：It is determined that in observation station G1The strike long drill gas pumping radius R at place1In G1KnHn
To G1Kn+mHn+mBetween.
Further, step 52 is also included in above-mentioned steps 51：Such as the peephole G1Kn+mOn vacuum table G1Kn+ mBn+mDesirable value P is not depressurized to Jing after observation cycle T0Under, then repeat in observation station G1Place opens up peephole, and on performing
The action of step 3 and step 4 is stated, until peephole G1Kn+m+aOn vacuum table G1Kn+m+aBn+m+aIt is depressurized to Jing after observation cycle T
Desirable value P0Under, now, the peephole G1Kn+m+aEnd away near the lane side side the strike long drill away from
From for G1Kn+m+aHn+m+a, and G1Kn+mHn+mMore than G1Kn+m+aHn+m+a(wherein a is the natural number more than or equal to 1)；Then in above-mentioned step
Observation station G is determined in rapid 61The strike long drill gas pumping radius R at place1In G1KnHnTo G1Kn+m+aHn+m+aBetween.
Further, second observation station G is further opened with the lane side2, and in observation station G2Place, performs behaviour
Make the action of step 3- step 6, it is determined that in observation station G2The strike long drill gas pumping radius R at place2In G2KnHnExtremely
G2Kn+m+aHn+m+aBetween, it is determined that strike long drill gas pumping radius R=(R1+R2)/2。
Further, N (N is the natural number more than or equal to 1) individual observation station is offered on the lane side, respectively at each
Observation station G1, G2... ..., GNPlace performs operating procedure 3- step 6, it is determined that in each observation station G1, G2... ..., GNThe trend at place
Long drilled holes gas pumping radius R1, R2... ..., RN, it is determined that strike long drill gas pumping radius R=(R1+R2,……,RN)/
N。
Further, three strike long drills are opened up in the construction coal, wherein first strike long drill
Air return way in construction coal, haulage gate of the strike long drill in construction coal, Article 2 described in Article 3
The strike long drill is arranged in first strike long drill and described in Article 3 between strike long drill；In the return air
N number of observation station is set on the lane side of crossheading, and first is calculated according to above-mentioned steps 3- step 6 and described move towards length
The strike long drill gas pumping radius R ' of drilling, arranges N number of observation station on the lane side of the haulage gate, and
The strike long drill gas pumping radius R of strike long drill according to above-mentioned steps 3- step 6 calculates Article 3 ", then really
Determine strike long drill gas pumping radius R=(R '+R ")/2.
Further, the peephole G1K1, the peephole G1K2... ..., G1Kn... ..., Gn+mKn+mIt is disposed in
In same level, it is vertical with the strike long drill.
Further, in the strike long drill parabolically property between methane gas capacity X and methane gas pressure P
Change, X=α P1/2, wherein, X is methane gas capacity, and unit is：m3/t；α is coal seam gas-bearing capacity coefficient, and unit is：m3/
(t·Mpa1/2)；P is methane gas pressure, and unit is：MPa；Wherein blood pressure lowering desirable value P0=0.51P.
Further, also comprise the steps in step 4：The opening of the strike long drill is sealed, by gas pump
Gas is outwards pumped into gas pumping field；
Further, each described vacuum table is connected respectively with external detection device, is monitored by external monitoring devices
And the change of methane gas pressure P on each described vacuum table is recorded, and the end of each peephole is recorded away from corresponding
The distance between strike long drill GKH, calculate strike long drill gas pumping radius by the external monitoring devices
R。
Further, it is performed both by above-mentioned steps 2- step 6 on each work surface in construction coal.
Using above-mentioned technical proposal, have the advantages that：
By arranging observation station at lane side, the trend that multiple observation stations are arranged on lane side along strike long drill sets
Put, and the peephole perpendicular to strike long drill is set in each observation station, it is existing along strike long drill so as to overcome
Peephole is arranged in direction, and causes construction, research cycle long, and construction cost is very high, and enterprise cannot bear, and test knot
Really inaccurate, insecure defect.
The change of gas pressure in by observing each peephole, when gas pressure is down to institute in one of peephole
When need to be worth, the end of the peephole is recorded away from strike long drill apart from h, primarily determine that gas pumping radius above-mentioned apart from h
Within.It is further continued for opening up peephole, and makes its end apart from strike long drill apart from H, and H is more than h, until a peephole
Gas pressure above is not down to desirable value, then can determine that gas pumping radius between h-H.
If it is desired to further the exact range of refinement gas pumping radius can to enter row interpolation between two values h-H,
Thus can gradually find an exact value.Gas pumping radius is measured in other observation stations using same method, then is made even
Average, you can the gas pumping radius for completing strike long drill is determined.
Thus, the strike long drill gas pumping radius assay method that this law invention is provided, overcomes above-mentioned traditional watt
The drawbacks of this hole pumping and mining radius assay method, it provides a kind of science, height for the determination of strike long drill gas pumping radius
Effect, accurate, lower-cost new method, the design and construction for the strike long drill of high prominent mine provides scientific basis and technology
Support, gas pumping rate is significantly increased in the case of reduces cost, be that the safety in production of mine escorts.
Description of the drawings
Fig. 1 is the schematic diagram that strike long drill and observation station are disposed with construction coal；
Fig. 2 is observation station G in Fig. 11The enlarged diagram at place；
Fig. 3 is observation station G in Fig. 12The enlarged diagram at place.
Reference synopsis：
1- construction coals；2- air return way；3- haulage gates；
4- gas pumpings field；5- lane sides；6- strike long drills.
G1、G2... ..., GnThe observation station of diverse location is represented respectively；
Gn K1、Gn K2... ..., Gn KnObservation station G is represented respectivelynThe peephole of place's diverse location；
GnKnH1、GnKnH2... ..., GnKnHnObservation station G is represented respectivelynThe end of the peephole of place's diverse location is away from trend
The distance of long drilled holes；
GnKnB1、GnKnB2... ..., GnKnBnObservation station G is represented respectivelynVacuum table on the peephole of place's diverse location.
Specific embodiment
Below in conjunction with the accompanying drawings come further illustrate the present invention specific embodiment.
A kind of strike long drill gas pumping radius assay method that the present invention is provided, is mainly used in strike long drill
Gas pumping radius is determined, and is determined by determining the gas pumping radius, can make two trends when strike long drill is opened up
The distance between long drilled holes are 2 times of gas pumping radius, make effective radius of influence institute shape of adjacent two piece strike long drill
Into circle it is circumscribed, under conditions of safety, economy is met, effect is optimum.
The action of a certain step A of execution being previously mentioned in the present invention, refers to the operation in another location execution step A, its
Action or mode of operation are identical, and only present position is different.
A kind of strike long drill gas pumping radius assay method that the present invention is provided, comprises the steps：With reference to figure
Shown in 1-3,
Step 1：At least one strike long drill 6 is opened up in construction coal 1；Wherein, the line that rock stratum face is intersected with level
The direction for being strike line, strike line two ends indication is the trend of rock stratum, and strike long drill 6 is the brill along strike line exploitation
Hole, drillable length is generally higher than 800m, longer than common tendency drilling, referred to as strike long drill.
Step 2：Observation station G is offered on lane side 51.Arranging observation station is used to observe strike long drill 6 at this
Interior methane gas change.
Step 3：In observation station G1Place opens up peephole G1K1, and peephole G1K1Arrange perpendicular to strike long drill 6, observe
Hole G1K1End away near the side of lane side 5 strike long drill 6 distance be G1K1H1, and in peephole G1K1On negative pressure is installed
Table G1K1B1；
By in observation station G1Place opens up peephole G1K1, and it arranges perpendicular to strike long drill 6, and cause the observation
Hole G1K1End away near the side of lane side 5 strike long drill 6 distance be G1K1H1, with the half of observed range strike long drill 6
Footpath G1K1H1The methane gas change at place, and by being arranged on peephole G1K1On vacuum table G1K1B1, observe methane gas at this
Change.
Step 4：Observation vacuum table G1K1B1On pressure change, peephole G1K1Interior original methane gas pressure value is P, and
Jing after observation cycle T, vacuum table G is observed1K1B1On pressure whether drop to desirable value P0；If original methane gas pressure value
For P, desirable value, that is, it is depressurized to the required for P of safety zone0, observation cycle is T.In observation cycle T, to observe vacuum table
G1K1B1On pressure whether drop to desirable value P0.If the original methane gas pressure value in each peephole is P.
Step 41：Such as above-mentioned vacuum table G1K1B1Desirable value P is not dropped to0, then repeat in observation station G1Place opens up observation
Hole, and the action of above-mentioned steps 3 and step 4 is performed, until in observation station G1The peephole G that place opens up1KnOn vacuum table
G1KnBnDesirable value P is depressurized to Jing after observation cycle T0Under, now, peephole G1KnEnd move towards length away near lane side side
The distance of drilling is G1KnHn, and, G1KnHnLess than G1Kn-1Hn-1(wherein n is the natural number more than or equal to 2)；
If above-mentioned vacuum table G1K1B1Desirable value P is not dropped to0, then repeat in observation station G1Place opens up peephole, and
The action of above-mentioned steps 3 and step 4 is performed, that is, is continued in observation station G1Place opens up peephole G1K2, then observe peephole
G1K2On vacuum table G1K1B2Either with or without dropping to desirable value P0.If vacuum table G1K1B2After cycle T, its gas air pressure
Also without near desirable value P0, then again in observation station G1Open up peephole G1K3, and the action of repeat the above steps 3 and step 4,
It is repeated in, until in observation station G1The peephole G that place opens up1KnOn vacuum table G1KnBnInstitute is depressurized to Jing after observation cycle T
Need to value P0Under, now, peephole G1KnEnd away near the side of lane side 5 strike long drill 6 distance be G1KnHn, and,
G1KnHnLess than G1Kn-1Hn-1.Record G1KnHn.Also, from G in aforesaid operations step1K1H1To G1KnHnLength gradually subtract
It is little, that is, it is increasingly towards strike long drill 6 close.Now can primarily determine that, strike long drill gas pumping radius R is primarily determined that
In G1KnHn-G1Kn-1Hn-1Between.
Step 5：The action of execution step 3 again, in observation station G1Place opens up peephole G1Kn+1, and execution step 4
Action, observes peephole G1Kn+1On the vacuum table G1Kn+1Bn+1, desirable value P whether is depressurized to Jing after observation cycle T0It
Under.
That is, peephole G is being observed1KnOn vacuum table G1KnBnDesirable value P is depressurized to Jing after observation cycle T0Under after,
It is further continued in observation station G1Place opens up peephole G1Kn+1, peephole G1Kn+1Distance of the end away from strike long drill 6 be G1Kn+ 1Hn+1, and G1Kn+1Hn+1More than G1KnHn, i.e., the peephole G for opening up again1Kn+1Strike long drill 6 is gradually distance from, to determine length is moved towards
The scope of drilling gas extraction radius R.
Step 51：Such as the vacuum table G1Kn+1Bn+1On methane gas pressure drop to desirable value P0Under, then repeat
In observation station G1Place opens up peephole, and the action of repeat the above steps 3 and step 4, directly in observation station G1The peephole that place opens up
G1Kn+mOn vacuum table G1Kn+mBn+mDesirable value P is not depressurized to Jing after observation cycle T0Under, now, the peephole
G1Kn+mEnd away near the lane side side the strike long drill distance be G1Kn+mHn+m, and, G1KnHnLess than G1Kn+ mHn+m(wherein m is the natural number more than or equal to 1)；
If above-mentioned vacuum table G1Kn+1Bn+1Desirable value P is not dropped to0, then repeat in observation station G1Place opens up peephole,
And the action of repeat the above steps 3 and step 4, that is, continue in observation station G1Place opens up peephole G1Kn+2, then observation
Hole G1Kn+2On vacuum table G1Kn+2Bn+2Either with or without dropping to desirable value P0.If vacuum table G1Kn+2Bn+2After cycle T, its
Gas air pressure is also without near desirable value P0, then in observation station G1Place opens up peephole G1KN+3,And repeat the above steps 3 and step
4 action, is repeated in, until in observation station G1The peephole G that place opens up1Kn+mOn vacuum table G1Kn+mBn+mJing observation cycles
Desirable value P is depressurized to after T0Under, now, peephole G1Kn+mEnd be away from the distance of strike long drill 6 near the side of lane side 5
G1Kn+mHn+m, and, G1KnHnLess than G1Kn+mHn+m.Record G1Kn+mHn+mAlso, from G in aforesaid operations step1KnHnArrive
G1Kn+mHn+mLength gradually increase, that is, be gradually distance from strike long drill 6.Now can primarily determine that, strike long drill gas
Extraction radius R is less than G1Kn+mHn+m, and G1Kn+mHn+mLess than G1Kn-1Hn-1。
Step 6：It is determined that in observation station G1The strike long drill gas pumping radius R at place1In G1KnHnTo G1Kn+mHn+mBetween.
It is determined that in G1The strike long drill gas pumping radius R at place1In G1KnHnTo G1Kn+mHn+mBetween, move towards jumping chisel so as to also can determine that
The gas pumping radius RG in hole 61KnHnTo G1Kn+mHn+mBetween.When strike long drill 6 is subsequently opened up, by strike long drill 6
Spacing is arranged on 2R1Between, it is ensured that after extraction, gas bearing capacity reaches necessary requirement.
Below above-mentioned technical proposal is explained with an embodiment：As shown in Figure 1-2,
In a construction coal 1, in solid coal seam strike long drill 6 is implemented, it is suitable that the periphery of construction coal 1 is disposed with return air
Groove 2, haulage gate 3, gas pumping drill site 4, gas pumping drill site 4 is carried out by gas pump to the gas in strike long drill 6
Extraction, wherein the hole depth of the single hole of the most long strike long drill 6 constructed reaches 1034m.
Due to the extensive enforcement and application of strike long drill, the mine gas extraction rate of the ore deposit has obtained significantly carrying
Height, is that the safety in production of mine is made that tremendous contribution.But due to without scientifically during strike long drill 6 is implemented
The gas pumping radius R of strike long drill is investigated, so being unable to science, reasonably determining adjacent two piece strike long drill 6
The spacing of wells, simply by virtue of the conventional empirically determined spacing of wells is 20m when causing construction strike long drill 6, is as a result caused
Other work surface, though strike long drill 6 is all constructed finish, and the extraction phase reaches more than 2 years, but due to extraction spacing mistake
Greatly, i.e., the spacing between strike long drill 6 is excessive, there are many clear areas, and multiple gas exceeding limit is caused during coal mining, it is necessary to
Complement mash gas pumping drilling again is taken, or even supplements measure to remedy using pump drainage blower fan, goaf pipe laying extraction etc., not only consumed
Take substantial amounts of man power and material, also there are many potential safety hazards, a kind of strike long drill gas pumping provided using the present invention
Radius assay method, does the measure work of gas strike long drill gas pumping radius, can receive good effect.
As shown in Figure 1-2, first, a gang of arrangement observation station G in the tunnel 5 of our air return way 21, in observation station G1, first
Construction peephole G1K1, and it is made perpendicular to the strike long drill 6 by most edge, and apart from spacing G of strike long drill 61K1H1
=20m.Peephole G is opened up1K1Afterwards, in peephole G1K1Upper installation vacuum table G1K1B1And be adapted to test gas relevant parameter
Three-way valve simultaneously records its original gas pressure P.
Then a period of time is observed again, and observation cycle T is carried out according to parameters such as permeability coefficient, the solid coefficients in coal seam
It is determined that, 15 days are defined as here for an observation cycle T.
Peephole G is found in observation cycle T1K1If interior gas pressure slippage is not above P0, then in peephole
G1K1The left side at the 5m parallel construction peephole G1K2, and construction depth is apart from spacing G of strike long drill 61K2H2=
10m；
Peephole G is found in observation cycle T1K2Interior gas pressure slippage is still not above P0, then in peephole
G1K2The left side at the 5m parallel construction peephole G1K3, and construction depth is apart from spacing G of strike long drill 61K3H3=5m,
Thus constantly approach strike long drill 6.
Assume to find peephole G in observation cycle T1K3Interior gas pressure slippage has exceeded P0, this shows to move towards length
The extraction radius R of drilling is between 5～10m.
Subsequently in peephole G1K3The left side at the 5m parallel construction peephole G1K4, and construction depth distance moves towards length
Spacing G of drilling 61K4H4=7.5m；Peephole G is found in observation cycle T1K4Interior gas pressure slippage is not above
P0, this shows the extraction radius R of strike long drill between 5～7.5m.Due to the trueness error of the mash gas pumping drilling of setting
It is determined that between 0.5～1.5m, it may be determined that go out in observation station G1Extraction radius be 6m.Subsequently we are in the work surface design
12m is designed to during the spacing of wells of strike long drill, improves face gas extraction rate, it is to avoid gas exceeding limit accident is sent out
It is raw, have received good application effect.
It is preferred that also including step 52 in above-mentioned steps 51：Such as peephole G1Kn+mOn vacuum table G1Kn+mBn+mJing sees
Survey after cycle T and be not depressurized to desirable value P0Under, then repeat in observation station G1Place opens up peephole, and the He of repeat the above steps 3
The action of step 4, until peephole G1Kn+m+aOn vacuum table G1Kn+m+aBn+m+aDesirable value P is depressurized to Jing after observation cycle T0It
Under, now, the peephole G1Kn+m+aEnd away near the side of lane side 5 the strike long drill distance be G1Kn+m+ aHn+m+a, and G1Kn+mHn+mMore than G1Kn+m+aHn+m+a(wherein a is the natural number more than or equal to 1)；Then determine in above-mentioned steps 6
Observation station G1The strike long drill gas pumping radius R at place1In G1KnHnTo G1Kn+m+aHn+m+aBetween.
After above-described embodiment, in order to seek accurately to determine strike long drill gas pumping radius R, can continue in peephole
G1K4The left side at the 5m parallel construction peephole G1K5, and construction depth is apart from spacing G of strike long drill 11K5H5=
6.25m；Peephole G is found in observation cycle T1K5Interior gas pressure slippage has exceeded P0, further accurately move towards jumping chisel
The extraction radius R in hole is between 6.25～7.5m.Due to extraction radius R be 6.25m or for 7.5m when, in its corresponding peephole
Methane gas pressure decrease beyond desirable value P0, by the method determine strike long drill extraction radius R it is more accurate
Really.Can accurately determine in observation station G1Extraction radius be 7m.Subsequently in the drilling of the work surface trends of design long drilled holes
14m is designed to during spacing, 2 gas pumping drill sites 4 is arranged in the work surface altogether, totally 40 strike long drills 6 have received good
Good extracting result, face gas extraction rate improves 23%, it is to avoid the generation of gas exceeding limit accident, have received good
Application effect.
It is preferred that as Figure 1-3, second observation station G is further opened with lane side 52, and in observation station G2Place, performs
The action of operating procedure 3- step 6, it is determined that in observation station G2The strike long drill gas pumping radius R at place2In G2KnHnExtremely
G2Kn+m+aHn+m+aBetween, it is determined that strike long drill gas pumping radius R=(R1+R2)/2。
Because strike long drill 6 is longer, and single hole hole depth up to more than 1000m, for further Accurate Determining, take out by its gas
Radius is adopted, second observation station G is offered on lane side 52, and according to step 3- step 6, it is determined that in observation station G2The trend at place
Long drilled holes gas pumping radius R2In G2KnHnTo G2Kn+m+aHn+m+aBetween, then move towards jumping chisel by what is measured at two observation stations
Hole gas pumping radius is averaged, and determines strike long drill gas pumping radius R=(R1+R2)/2, measurement result is more accurate
Really.
Certainly multiple observation stations G can be set as neededn, i.e., N is offered on lane side 5, and (N is oneself more than or equal to 1
So count) individual observation station, respectively in each observation station G1, G2... ..., GNPlace performs operating procedure 3- step 6, it is determined that in each sight
Measuring point G1, G2... ..., GNThe strike long drill gas pumping radius R at place1, R2... ..., RN, it is determined that strike long drill gas is taken out
Adopt radius R=(R1+R2,……,RN)/N.Improve the accuracy of strike long drill gas pumping radius R.
Measuring method at each observation station with first observation station G1The measuring method at place is identical, and here is no longer gone to live in the household of one's in-laws on getting married
State.
It is preferred that as shown in figure 1, open up three strike long drills 6 in construction coal 1, wherein first is moved towards jumping chisel
Air return way 2 of the hole 6 in construction coal 1, haulage gate 3 of the Article 3 strike long drill 6 in construction coal 1, the
Two strike long drill 6 is arranged between first strike long drill 6 and Article 3 strike long drill 6；In the lane of air return way 2
N number of observation station is set in side 5, and the strike long drill watt of first strike long drill 6 is calculated according to above-mentioned steps 3- step 6
This extraction radius R ', arranges N number of observation station on the lane side 5 of haulage gate 3, and calculates according to above-mentioned steps 3- step 6
Three strike long drills 6 strike long drill gas pumping radius R ", it is determined that strike long drill gas pumping radius R=(R '+
R″)/2。
Due to opening up three strike long drills 6 in construction coal 1, or a plurality of strike long drill 6 is set, one is only determined
The strike long drill gas pumping radius of strike long drill, it is as a result not accurate enough.Then move towards jumping chisel to more accurately determine
Hole gas pumping radius, arranges N number of observation station on the lane side 5 of air return way 2, and is calculated according to above-mentioned steps 3- step 6
The strike long drill gas pumping radius R ' of first strike long drill 6, on the lane side 5 of haulage gate 3 N number of observation is arranged
Point, and the strike long drill gas pumping radius R of Article 3 strike long drill 6 is calculated according to above-mentioned steps 3- step 6 ", really
Determine strike long drill gas pumping radius R=(R '+R ")/2.By all surveying to the every strike long drill 6 near lane side 5
Amount, improves the accuracy of measurement.
It is preferred that peephole G1K1, peephole G1K2... ..., G1Kn... ..., Gn+mKn+mIt is disposed in same level
On, it is vertical with strike long drill 6.The peephole arranged on each coal-face, all in same level, and its
It is vertical with strike long drill 6.In same level, gas content is roughly the same, can improve the accuracy of measurement, the opposing party
Face overcomes the existing direction along strike long drill 6 and arranges peephole, and causes construction, research cycle long, and constructs
Cost is very high, and enterprise cannot bear, and test result is inaccurate, insecure defect.
It is preferred that parabolically property becomes between the methane gas capacity X and methane gas pressure P in the strike long drill
Change,
X=α P1/2, wherein, X is methane gas capacity, and unit is：m3/t；
α is coal seam gas-bearing capacity coefficient, and unit is：m3/(t·Mpa1/2)；
P is the original methane gas pressure in peephole, and unit is：MPa；
Wherein blood pressure lowering desirable value P0=0.51P.
Take out in advance after coal-bed gas, it is necessary to the prominent effect of Gas pre-drainage preventing and treating is tested, one of index of its inspection is
The pre- pumping rate of coal-bed gas is more than the gas bearing capacity after 30%, i.e. extraction less than more than 70% before extraction.Ensureing commercial Application
Under the premise of error is allowed, gas pressure P and gas bearing capacity X have a parabolic relation, i.e.,：X=α P1/2, X is device in Gas
Body capacity, unit is：m3/t；α is coal seam gas-bearing capacity coefficient, and unit is：m3/(t·Mpa1/2)；P is original in peephole
Methane gas pressure, unit is：MPa.Therefore, the ratio that the ratio and gas pressure that gas bearing capacity is reduced before and after extraction is reduced
There is parabolic relation.If the pre- pumping rate in coal seam is the 70% of original gas for 30%, i.e. gas remainder quantity, by meter
Now remaining gas pressure value P is known in calculation1For the 49% of original gas pressure value P, gas pressure slippage desirable value P0=P-P1=
0.51P。
It is preferred that also comprising the steps in step 4：The opening of strike long drill 6 is sealed, is outwards taken out by gas pump
Gas is sent into gas pumping field 4；Gas pressure, the gas for sealing of hole is carried out by professional and technical personnel, observing in each peephole
Concentration, and make a record, there is special messenger to carry out data compilation, compare and analyze, and provide observation report material.
Each vacuum table is connected respectively with external detection device, is monitored and is recorded described in each by external monitoring devices
The change of the methane gas pressure P on vacuum table, and record the end of each peephole and described move towards jumping chisel away from corresponding
The distance between hole GKH, by external monitoring devices strike long drill gas pumping radius R is calculated.By external monitoring devices,
Such as computer installation, is recorded, is calculated, and improves work efficiency and degree of accuracy.
Above-mentioned steps 2- step 6 is performed both by each work surface in construction coal, can more accurately be determined
Strike long drill gas pumping radius R.
Thus, the strike long drill gas pumping radius assay method, has broken traditional gas drilling extraction radius and has surveyed
Determine the mode of the cloth hole parallel with peephole of extraction borehole in method, creatively propose suitable strike long drill and determine observation
Hole gas pressure, the new method of variation ofgas density, i.e. peephole are mutually perpendicular to extraction borehole, and can along move towards length
Boring direction arranges multiple observation stations, and the measure for strike long drill gas pumping radius provides new thinking and method, fills out
Domestic blank is mended.
In which overcoming traditional gas drilling extraction radius assay method, because the several parallel strike long drills of arrangement
Not only construction, research cycle are long, and construction cost is very high, and enterprise cannot bear；In addition long construction period also results in brill
In hole gas loss cause test result it is inaccurate, it is unreliable the shortcomings of and deficiency, explore a kind of strike long drill gas and take out
The new method of radius measure is adopted, the design and construction for strike long drill provides scientific basis and theoretical direction.
Its construction work amount is less, construction technology is simple, expense is low, and can select multiple observations according to actual conditions
Point carries out test observation, and the accuracy that extraction radius is determined is higher.
As needed, above-mentioned each technical scheme can be combined, to reach best-of-breed technology effect.
Above-described is only the principle and preferred embodiment of the present invention.It should be pointed out that for the common skill of this area
For art personnel, on the basis of the principle of the invention, some other modifications can also be made, also should be regarded as the protection model of the present invention
Enclose.
Claims (10)
1. a kind of strike long drill gas pumping radius assay method, it is characterised in that comprise the steps：
Step 1：At least one strike long drill is opened up in construction coal；
Step 2：Observation station G is offered on lane side1,
Step 3：In observation station G1Place opens up peephole G1K1, and the peephole G1K1Set perpendicular to the strike long drill
Put, the peephole G1K1End away near the lane side side the strike long drill distance be G1K1H1, and described
Peephole G1K1On vacuum table G is installed1K1B1；
Step 4：Observe the vacuum table G1K1B1On pressure change, the peephole G1K1Interior original methane gas pressure value is
P, and Jing after observation cycle T, observe the vacuum table G1K1B1On pressure whether drop to desirable value P0；
Step 41：Such as the vacuum table G1K1B1Desirable value P is not dropped to0, then repeat in observation station G1Place opens up peephole, and
The action of above-mentioned steps 3 and step 4 is performed, until in observation station G1The peephole G that place opens up1KnOn vacuum table G1KnBn
Desirable value P is depressurized to Jing after observation cycle T0Under, now, the peephole G1KnEnd away near the lane side side institute
The distance for stating strike long drill is G1KnHn, and, G1KnHnLess than G1Kn-1Hn-1, wherein n is the natural number more than or equal to 2；
Step 5：The action of execution step 3 again, in observation station G1Place opens up peephole G1Kn+1, and perform above-mentioned steps 4
Action, observes peephole G1Kn+1On the vacuum table G1Kn+1Bn+1, desirable value P whether is depressurized to Jing after observation cycle T0It
Under,
Step 51：Such as the vacuum table G1Kn+1Bn+1On methane gas pressure drop to desirable value P0Under, then repeat seeing
Measuring point G1Place opens up peephole, and the action of repeat the above steps 3 and step 4, until in observation station G1The observation that place opens up
Hole G1Kn+mOn vacuum table G1Kn+mBn+mDesirable value P is not depressurized to Jing after observation cycle T0Under, now, the peephole
G1Kn+mEnd away near the lane side side the strike long drill distance be G1Kn+mHn+m, and, G1KnHnLess than G1Kn+ mHn+m, wherein m is the natural number more than or equal to 1；
Step 6：It is determined that in observation station G1The strike long drill gas pumping radius R at place1In G1KnHnTo G1Kn+mHn+mBetween.
2. a kind of strike long drill gas pumping radius assay method according to claim 1, it is characterised in that above-mentioned
Also include step 52 in step 51：Such as the peephole G1Kn+mOn vacuum table G1Kn+mBn+mJing after observation cycle T without blood pressure lowering
To desirable value P0Under, then repeat in observation station G1Place opens up peephole, and the action of repeat the above steps 3 and step 4, until
Peephole G1Kn+m+aOn vacuum table G1Kn+m+aBn+m+aDesirable value P is depressurized to Jing after observation cycle T0Under,
Now, the peephole G1Kn+m+aEnd away near the lane side side the strike long drill distance be G1Kn+m+ aHn+m+a, and G1Kn+mHn+mMore than G1Kn+m+aHn+m+a, wherein a is the natural number more than or equal to 1；
Observation station G is then determined in above-mentioned steps 61The strike long drill gas pumping radius R at place1In G1KnHnTo G1Kn+m+ aHn+m+aBetween.
3. a kind of strike long drill gas pumping radius assay method according to claim 2, it is characterised in that described
Second observation station G is further opened with lane side2, and in observation station G2Place, performs the action of operating procedure 3- step 6, it is determined that
In observation station G2The strike long drill gas pumping radius R at place2In G2KnHnTo G2Kn+m+aHn+m+aBetween, it is determined that trend
Long drilled holes gas pumping radius R=(R1+R2)/2。
4. a kind of strike long drill gas pumping radius assay method according to claim 3, it is characterised in that described
N number of observation station is offered on lane side, N is the natural number more than or equal to 1, respectively in each observation station G1, G2... ..., GNPlace performs
Operating procedure 3- step 6, it is determined that in each observation station G1, G2... ..., GNThe strike long drill gas pumping radius R at place1,
R2... ..., RN, it is determined that strike long drill gas pumping radius R=(R1+R2,……,RN)/N。
5. a kind of strike long drill gas pumping radius assay method according to claim 4, it is characterised in that described
Three strike long drills are opened up in construction coal, wherein the return air of first strike long drill in construction coal is suitable
Groove, haulage gate of the strike long drill in construction coal described in Article 3, strike long drill described in Article 2 is arranged in
One strike long drill and described in Article 3 between strike long drill；
N number of observation station is set on the lane side of the air return way, and is calculated according to above-mentioned steps 3- step 6
The strike long drill gas pumping radius R ' of one strike long drill, on the lane side of the haulage gate N is arranged
The individual observation station, and according to above-mentioned steps 3- step 6 calculates Article 3 strike long drill strike long drill gas
Extraction radius R ",
Then determine strike long drill gas pumping radius R=(R '+R ")/2.
6. a kind of strike long drill gas pumping radius assay method according to any one in claim 1-5, it is special
Levy and be, the peephole G1K1, the peephole G1K2... ..., G1Kn... ..., Gn+mKn+mIt is disposed in same level
On, it is vertical with the strike long drill.
7. a kind of strike long drill gas pumping radius assay method according to claim 6, it is characterised in that it is described walk
To parabolically property change between the methane gas capacity X in long drilled holes and methane gas pressure P,
X=α P1/2,
Wherein, X is methane gas capacity, and unit is：m3/t；
α is coal seam gas-bearing capacity coefficient, and unit is：m3/(t·Mpa1/2)；
P is methane gas pressure, and unit is：MPa；
Wherein blood pressure lowering desirable value P0=0.51P.
8. a kind of strike long drill gas pumping radius assay method according to claim 1, it is characterised in that in step
Also comprise the steps in 4：The opening of the strike long drill is sealed, gas is outwards pumped to gas pumping field by gas pump
In.
9. a kind of strike long drill gas pumping radius assay method according to claim 1, it is characterised in that by each
The vacuum table is connected respectively with external detection device, is monitored and is recorded on each described vacuum table by external monitoring devices
The change of methane gas pressure P, and record the end of each peephole between the corresponding strike long drill away from
From GKH, by the external monitoring devices strike long drill gas pumping radius R is calculated.
10. a kind of strike long drill gas pumping radius assay method according to claim 1, it is characterised in that applying
Above-mentioned steps 2- step 6 is performed both by each work surface in work coal seam.
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| CN104696004B (en) * | 2015-01-30 | 2017-05-24 | 河南理工大学 | Measurement method of extracting gas effective radius of boreholes based on content of residual gas |
| 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 |
| CN105804787B (en) * | 2016-03-28 | 2019-03-05 | 西南石油大学 | The method of coal petrography cranny development height is covered on a kind of measurement stope working surface of coal mines |
| CN106401557B (en) * | 2016-08-31 | 2019-05-07 | 安徽理工大学 | A kind of method of joint test coal seam gas-bearing capacity and the determining effective extraction radius that drills of gas pressure |
| CN106988732A (en) * | 2017-05-23 | 2017-07-28 | 山西潞安环保能源开发股份有限公司 | A kind of coal mine gas drainage radius on-line determination method |
| CN110219699B (en) * | 2019-04-24 | 2020-04-03 | 中国矿业大学 | Device and method for measuring effective influence radius of gas extraction drill hole |
| CN111535800B (en) * | 2020-04-16 | 2023-11-24 | 湘潭大学 | Method for measuring downward drilling gas pressure of environment-friendly water-bearing coal seam |
| 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 |
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