CN104295289A - Gas extraction radius determining method for strike long drilled hole - Google Patents
Gas extraction radius determining method for strike long drilled hole Download PDFInfo
- Publication number
- CN104295289A CN104295289A CN201410400097.5A CN201410400097A CN104295289A CN 104295289 A CN104295289 A CN 104295289A CN 201410400097 A CN201410400097 A CN 201410400097A CN 104295289 A CN104295289 A CN 104295289A
- Authority
- CN
- China
- Prior art keywords
- long drill
- strike long
- peephole
- strike
- observation point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000605 extraction Methods 0.000 title abstract description 39
- 238000000034 method Methods 0.000 title abstract description 31
- 239000003245 coal Substances 0.000 claims abstract description 38
- 238000005086 pumping Methods 0.000 claims description 106
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 59
- 238000010276 construction Methods 0.000 claims description 47
- 230000009471 action Effects 0.000 claims description 24
- 238000003556 assay Methods 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 169
- 238000005553 drilling Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000011160 research Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
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, particularly relate to a kind of strike long drill gas pumping radius assay method.
Background technology
The selection of the gas pumping radius of this traditional coal seam, adjacent layer, release drainage and concordant mash gas pumping drilling, often based on experience, is seldom carried out in detail, is scientifically investigated, cause mash gas pumping drilling line space design unreasonable.At highly gassy mine or coal and projecting mine because the design of gas pumping radius is unreasonable, often cause coal seam in extraction process, otherwise due to the excessive existence of the spacing of wells a large amount of do not take out region (i.e. blank tape), cause extracting result bad; Cause because the spacing of wells is too small that drilling construction engineering quantity is excessive, extraction cost is increased sharply.
Traditional gas pumping radius assay method adopts pressure decline method or discharge method usually, also tests tracer gas technique.These methods have played very large effect in the regular period, but pressure decline method or discharge method are all carry out Ma Lisan sealing of hole after first drilling construction being completed, then open extraction borehole valve and carry out extraction, finally observation boring is carried out to the long-term observation of relevant parameter, this wherein destroys the integrality of coal body with regard to have ignored too much drilling construction, thus the gas permeability of coal seam added between the boring of interval, cause result of the test inaccurate; SF6 search gas is a kind of artificial inert gas, and mining industry is commonly used for anti-adsorption agent, does not replace with the CH4 be adsorbed in coal body, and this gas is met gap and can be passed.Surveying gas pumping radius by the method has a very large shortcoming to be exactly: SF6 search gas method of testing is thing qualitatively, as long as there is crack to exist in coal body, SF6 search gas will be detected by mash gas pumping drilling under passage two ends of leaking out exist the condition of pressure reduction, and SF6 trace gas detection content is how many times, being defined as the effective radius of influence of gas pumping does not but have quantitative standard.
For the research comparative maturity of the gas pumping radius of the general boring of tendency in prior art, but for the measuring method of the gas pumping effective radius of strike long drill at present in this research field or a blank, because the hole depth of some strike long drill 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, definitely gas pressure measurement method, gas bearing capacity determination method, SF6 search gas determination method, set up in mensuration that gas drilling flow equation determination method mechanically can not indiscriminately imitate strike long drill gas pumping radius and go, because arrange that several parallel strike long drill is not only constructed, research cycle is long, and construction cost is very high, enterprise cannot bear; Long construction period also can cause gas loss in boring to cause test result inaccurate, unreliable in addition.
Domestic and international academia does not also have a kind of method of maturation to measure for the mensuration aspect of strike long drill extraction radius at present, causes the design of the cloth hole of strike long drill to have blindness and randomness.Implement in the process of strike long drill owing to scientifically not investigating the gas pumping radius of strike long drill, so can not science, reasonably determine the spacing of wells of strike long drill, cause construction strike long drill time simply by virtue of the experience determination spacing of wells be in the past 20m, even if result causes individual work face, strike long drill has been constructed complete all, and the extraction phase reaches more than 2 years, but there is many clear areas because extraction spacing is excessive, repeatedly gas exceeding limit is caused during coal mining, also must take complement mash gas pumping drilling again, even adopt pump drainage blower fan, the supplementary measures such as goaf pipe laying extraction are made up, the not only man power and material of at substantial, also there is a lot of potential safety hazard.
Summary of the invention
Goal of the invention of the present invention is to overcome defect of the prior art, there is provided that a kind of construction works amount is few, construction technology is simple, expense is low, multiple observation point can be selected to carry out test observation, the strike long drill gas pumping radius assay method that the degree of accuracy that gas pumping radius measures is higher according to actual conditions.
A kind of strike long drill gas pumping radius assay method that technical solution of the present invention provides, comprises the steps: step 1: in construction coal, offer at least one strike long drill; Step 2: help in lane and offer an observation point G
1, step 3: at described observation point G
1place offers peephole G
1k
1, and described peephole G
1k
1arrange perpendicular to described strike long drill, described peephole G
1k
1end-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
1h
1, and at described peephole G
1k
1on vacuum table G is installed
1k
1b
1; Step 4: observe described vacuum table G
1k
1b
1on pressure change, described peephole G
1k
1interior original methane gas force value is P, and after observation cycle T, observes described vacuum table G
1k
1b
1on pressure whether drop to desirable value P
0; Step 41: as described in vacuum table G
1k
1b
1do not drop to desirable value P
0, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, until at described observation point G
1the peephole G that place offers
1k
non vacuum table G
1k
nb
ndesirable value P is depressurized to after observation cycle T
0under, now, described peephole G
1k
nend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
nh
n, and, G
1k
nh
nbe less than G
1k
n-1h
n-1(wherein n be more than or equal to 2 natural number); Step 5: the action performing step 3 again, at described observation point G
1the peephole G that place offers
1k
n+1, and perform the action of step 4, observe peephole G
1k
n+1on described vacuum table G
1k
n+1b
n+1, after observation cycle T, whether be depressurized to desirable value P
0under, step 51: as described in vacuum table G
1k
n+1b
n+1on the pressure drop of methane gas to desirable value P
0under, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, directly at described observation point G
1the peephole G that place offers
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is not depressurized to after observation cycle T
0under, now, described peephole G
1k
n+mend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
n+mh
n+m, and, G
1k
nh
nbe less than G
1k
n+mh
n+m(wherein m be more than or equal to 1 natural number); Step 6: determine at described observation point G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+mh
n+mbetween.
Further, in above-mentioned steps 51, also comprise step 52: as described in peephole G
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is not depressurized to after observation cycle T
0under, then repeat at observation point G
1place offers peephole, and performs the action of above-mentioned steps 3 and step 4, until peephole G
1k
n+m+aon vacuum table G
1k
n+m+ab
n+m+adesirable value P is depressurized to after observation cycle T
0under, now, described peephole G
1k
n+m+aend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
n+m+ah
n+m+a, and G
1k
n+mh
n+mbe greater than G
1k
n+m+ah
n+m+a(wherein a be more than or equal to 1 natural number); Then in above-mentioned steps 6, determine described observation point G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+m+ah
n+m+abetween.
Further, help in described lane and also offer second observation point G
2, and at described observation point G
2place, the action of executable operations step 3-step 6, determines at described observation point G
2the strike long drill gas pumping radius R at place
2at G
2k
nh
nto G
2k
n+m+ah
n+m+abetween, then determine strike long drill gas pumping radius R=(R
1+ R
2)/2.
Further, help in described lane offer N (N be more than or equal to 1 natural number) individual observation point, respectively at each observation point G
1, G
2..., G
nplace executable operations step 3-step 6, determines at each observation point G
1, G
2..., G
nthe strike long drill gas pumping radius R at place
1, R
2..., R
n, then strike long drill gas pumping radius R=(R is determined
1+ R
2..., R
n)/N.
Further, three strike long drills are offered in described construction coal, the wherein air return way of strike long drill described in Article 1 in construction coal, the haulage gate of strike long drill described in Article 3 in construction coal, strike long drill described in Article 2 to be arranged in described in strike long drill described in Article 1 and Article 3 between strike long drill; Help in the described lane of described air return way and N number of described observation point is set, and according to above-mentioned steps 3-step 6 calculate the strike long drill gas pumping radius R of strike long drill described in Article 1 ', help in the described lane of described haulage gate and N number of described observation point is set, and the strike long drill gas pumping radius R of strike long drill described in Article 3 is calculated according to above-mentioned steps 3-step 6 ", then strike long drill gas pumping radius R=(R '+R ")/2 is determined.
Further, described peephole G
1k
1, described peephole G
1k
2..., described G
1k
n..., described G
n+mk
n+mall be disposed in same level, it is all vertical with described strike long drill.
Further, the methane gas capacity X in described strike long drill and between methane gas pressure P parabolically property change, X=α P
1/2, wherein, X is methane gas capacity, and unit is: m
3/ t; α is coal seam gas-bearing capacity coefficient, and unit is: m
3/ (tMpa
1/2); P is methane gas pressure, and unit is: MPa; Wherein step-down desirable value P
0=0.51P.
Further, also comprise the steps: the opening sealing described strike long drill in step 4, outwards pump gas in gas pumping field by gas pump;
Further, each described vacuum table is connected with external detection device respectively, monitored by external monitoring devices and record the change of the methane gas pressure P on each described vacuum table, and the distance GKH between the corresponding described strike long drill of the end-to-end distance recording each described peephole, calculate strike long drill gas pumping radius R by described external monitoring devices.
Further, each work plane in construction coal all performs above-mentioned steps 2-step 6.
Adopt technique scheme, there is following beneficial effect:
By arranging observation point at place of side, lane, multiple observation point be arranged on lane help along strike long drill move towards arrange, and the peephole perpendicular to strike long drill is set in each observation point, thus overcome the existing direction along strike long drill layout peephole, and cause construction, research cycle long, and construction cost is very high, enterprise cannot bear, and inaccurate, the insecure defect of test result.
By observing the change of gas pressure in each peephole, when gas pressure in one of them peephole be down to desirable value time, record the distance h of the end-to-end distance strike long drill of this peephole, tentatively determine that gas pumping radius is within above-mentioned distance h.Continue again to offer peephole, and make its end-to-end distance from the distance H of strike long drill, and H is greater than h, until the gas pressure above a peephole is not down to desirable value, then can determine that gas pumping radius is between h-H.
If think that the exact range of further refinement gas pumping radius can also carry out interpolation between two value h-H, an exact value will be found gradually like this.Adopting uses the same method measures gas pumping radius in other observation points, then averages, and the gas pumping radius that can complete strike long drill measures.
Thus, this law invents the strike long drill gas pumping radius assay method provided, overcome the drawback of above-mentioned traditional gas drilling extraction radius assay method, its determination for strike long drill gas pumping radius provides a kind of science, efficient, accurate, lower-cost new method, for the dash forward design of strike long drill of mine and construction of height provides scientific basis and technical support, gas pumping rate is improved significantly, for the safety in production of mine escorts when reducing costs.
Accompanying drawing explanation
Fig. 1 is the schematic diagram being furnished with strike long drill and observation point in construction coal;
Fig. 2 is observation point G in Fig. 1
1the enlarged diagram at place;
Fig. 3 is observation point G in Fig. 1
2the enlarged diagram at place.
The Reference numeral table of comparisons:
1-construction coal; 2-air return way; 3-haulage gate;
4-gas pumping field; 5-lane is helped; 6-strike long drill.
G
1, G
2..., G
nrepresent the observation point of diverse location respectively;
G
nk
1, G
nk
2..., G
nk
nrepresent observation point G respectively
nthe peephole of place's diverse location;
G
nk
nh
1, G
nk
nh
2..., G
nk
nh
nrepresent observation point G respectively
nthe distance of the end-to-end distance strike long drill of the peephole of place's diverse location;
G
nk
nb
1, G
nk
nb
2..., G
nk
nb
nrepresent observation point G respectively
nvacuum table on the peephole of place's diverse location.
Detailed description of the invention
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
A kind of strike long drill gas pumping radius assay method provided by the invention, be mainly used in measuring the gas pumping radius of strike long drill, measure by measuring this gas pumping radius, can when offering strike long drill, the distance between two strike long drills is made to be 2 times of gas pumping radius, the circle that effective radius of influence of two adjacent strike long drills is formed is circumscribed, and under satisfied safe, economic condition, effect is optimum.
The action of a certain steps A of the execution mentioned in the present invention, refers to and performs the operation of steps A in another location, its action or mode of operation identical, only present position is different.
A kind of strike long drill gas pumping radius assay method provided by the invention, comprises the steps: to combine with shown in Fig. 1-3,
Step 1: offer at least one strike long drill 6 in construction coal 1; Wherein, face, the rock stratum line crossing with level is strike line, and the direction of strike line two ends indication is the trend of rock stratum, strike long drill 6 is the boring along strike line exploitation, drillable length is generally greater than 800m, longer than the boring of common tendency, is referred to as strike long drill.
Step 2: offer an observation point G in lane side 5
1.Observation point is set for the methane gas change in this place's strike long drill 6 of observation.
Step 3: at observation point G
1place offers peephole G
1k
1, and peephole G
1k
1arrange perpendicular to strike long drill 6, peephole G
1k
1end-to-end distance help the distance of the strike long drill 6 of 5 sides to be G near lane
1k
1h
1, and at peephole G
1k
1on vacuum table G is installed
1k
1b
1;
By at observation point G
1place offers peephole G
1k
1, and it is arranged perpendicular to strike long drill 6, and make this peephole G
1k
1end-to-end distance help the distance of the strike long drill 6 of 5 sides to be G near lane
1k
1h
1, with the radius G of observed range strike long drill 6
1k
1h
1the methane gas change at place, and by being arranged on peephole G
1k
1on vacuum table G
1k
1b
1, observe this place's methane gas change.
Step 4: observation vacuum table G
1k
1b
1on pressure change, peephole G
1k
1interior original methane gas force value is P, and after observation cycle T, observation vacuum table G
1k
1b
1on pressure whether drop to desirable value P
0; If original methane gas force value is P, desirable value, the institute being namely depressurized to safety zone is required to be P
0, observation cycle is T.With in observation cycle T, observe vacuum table G
1k
1b
1on pressure whether drop to desirable value P
0.If the original methane gas force value in each peephole is P.
Step 41: as above-mentioned vacuum table G
1k
1b
1do not drop to desirable value P
0, then repeat at observation point G
1place offers peephole, and performs the action of above-mentioned steps 3 and step 4, until at observation point G
1the peephole G that place offers
1k
non vacuum table G
1k
nb
ndesirable value P is depressurized to after observation cycle T
0under, now, peephole G
1k
nend-to-end distance be G near the distance of the strike long drill of lane side side
1k
nh
n, and, G
1k
nh
nbe less than G
1k
n-1h
n-1(wherein n be more than or equal to 2 natural number);
If above-mentioned vacuum table G
1k
1b
1do not drop to desirable value P
0, then repeat at observation point G
1place offers peephole, and performs the action of above-mentioned steps 3 and step 4, namely continues at observation point G
1place offers peephole G
1k
2, then observe peephole G
1k
2on vacuum table G
1k
1b
2whether drop to desirable value P
0.If vacuum table G
1k
1b
2after cycle T, its gas air pressure does not also have near desirable value P
0, then again at observation point G
1offer peephole G
1k
3, and repeat the action of above-mentioned steps 3 and step 4, repeat successively, until at observation point G
1the peephole G that place offers
1k
non vacuum table G
1k
nb
ndesirable value P is depressurized to after observation cycle T
0under, now, peephole G
1k
nend-to-end distance help the distance of the strike long drill 6 of 5 sides to be G near lane
1k
nh
n, and, G
1k
nh
nbe less than G
1k
n-1h
n-1.Record G
1k
nh
n.Further, in aforesaid operations step from G
1k
1h
1to G
1k
nh
nlength reduce gradually, namely close towards strike long drill 6 gradually.Now can tentatively determine, strike long drill gas pumping radius R is tentatively determined at G
1k
nh
n-G
1k
n-1h
n-1between.
Step 5: the action performing step 3 again, at described observation point G
1place offers peephole G
1k
n+1, and perform the action of step 4, observe peephole G
1k
n+1on described vacuum table G
1k
n+1b
n+1, after observation cycle T, whether be depressurized to desirable value P
0under.
That is, peephole G is being observed
1k
non vacuum table G
1k
nb
ndesirable value P is depressurized to after observation cycle T
0under after, then to continue at observation point G
1place offers peephole G
1k
n+1, peephole G
1k
n+1the distance of end-to-end distance strike long drill 6 be G
1k
n+1h
n+1, and G
1k
n+1h
n+1be greater than G
1k
nh
n, the peephole G namely offered again
1k
n+1gradually away from strike long drill 6, to measure the scope of strike long drill gas pumping radius R.
Step 51: as described in vacuum table G
1k
n+1b
n+1on the pressure drop of methane gas to desirable value P
0under, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, directly at observation point G
1the peephole G that place offers
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is not depressurized to after observation cycle T
0under, now, described peephole G
1k
n+mend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
n+mh
n+m, and, G
1k
nh
nbe less than G
1k
n+mh
n+m(wherein m be more than or equal to 1 natural number);
If above-mentioned vacuum table G
1k
n+1b
n+1do not drop to desirable value P
0, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, namely continues at observation point G
1place offers peephole G
1k
n+2, then observe peephole G
1k
n+2on vacuum table G
1k
n+2b
n+2whether drop to desirable value P
0.If vacuum table G
1k
n+2b
n+2after cycle T, its gas air pressure does not also have near desirable value P
0, then at observation point G
1place offers peephole G
1k
n+3, and repeat the action of above-mentioned steps 3 and step 4, repeat successively, until at observation point G
1the peephole G that place offers
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is depressurized to after observation cycle T
0under, now, peephole G
1k
n+mend-to-end distance help the distance of the strike long drill 6 of 5 sides to be G near lane
1k
n+mh
n+m, and, G
1k
nh
nbe less than G
1k
n+mh
n+m.Record G
1k
n+mh
n+mfurther, in aforesaid operations step from G
1k
nh
nto G
1k
n+mh
n+mlength increase gradually, namely gradually away from strike long drill 6.Now can tentatively determine, strike long drill gas pumping radius R is less than G
1k
n+mh
n+m, and G
1k
n+mh
n+mbe less than G
1k
n-1h
n-1.
Step 6: determine at observation point G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+mh
n+mbetween.Determine at G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+mh
n+mbetween, thus also can determine the gas pumping radius R G of strike long drill 6
1k
nh
nto G
1k
n+mh
n+mbetween.Follow-up offer strike long drill 6 time, the spacing of strike long drill 6 is arranged on 2R
1between, after can ensureing extraction, gas bearing capacity reaches necessary requirement.
Technique scheme is explained below: as shown in Figure 1-2 with an embodiment,
In a construction coal 1, strike long drill 6 is implemented at solid coal seam, construction coal 1 periphery has air return way 2, haulage gate 3, gas pumping drill site 4, gas pumping drill site 4 carries out extraction by gas pump to the gas in strike long drill 6, and the hole depth of the single hole of the longest strike long drill 6 of wherein constructing reaches 1034m.
Due to extensive enforcement and the application of strike long drill, the mine gas extraction rate in this ore deposit obtains and improves significantly, and tremendous contribution has been made in the safety in production for mine.But owing to scientifically not investigating the gas pumping radius R of strike long drill in the process implementing strike long drill 6, so can not science, reasonably determine the spacing of wells of two adjacent strike long drills 6, cause construction strike long drill 6 time simply by virtue of the experience determination spacing of wells be in the past 20m, result causes individual work face, even if strike long drill 6 is all constructed complete, and the extraction phase reaches more than 2 years, but because extraction spacing is excessive, namely the spacing between strike long drill 6 is excessive, there is many clear areas, repeatedly gas exceeding limit is caused during coal mining, also must take complement mash gas pumping drilling again, even adopt pump drainage blower fan, the supplementary measures such as goaf pipe laying extraction are made up, the not only man power and material of at substantial, also there is a lot of potential safety hazard, adopt a kind of strike long drill gas pumping radius assay method provided by the invention, do the mensuration work of gas strike long drill gas pumping radius, good effect can be received.
As shown in Figure 1-2, first, a gang of layout observation point G in the tunnel 5 of our air return way 2
1, at observation point G
1, first construct peephole G
1k
1, and make it perpendicular to the strike long drill 6 by most edge, and the spacing G of distance strike long drill 6
1k
1h
1=20m.Offer peephole G
1k
1after, at peephole G
1k
1upper installation vacuum table G
1k
1b
1and be applicable to the three-way valve of test gas relevant parameter and record its original gas pressure P.
And then observing a period of time, observation cycle T carries out determining according to the parameter such as permeability coefficient, solid coefficient in coal seam, and being defined as here 15 days is an observation cycle T.
Peephole G is found in observation cycle T
1k
1if interior gas pressure slippage is not more than P
0, then at peephole G
1k
1the left side at a distance of 5m place parallel construction peephole G
1k
2, and the spacing G of construction depth distance strike long drill 6
1k
2h
2=10m;
Peephole G is found in observation cycle T
1k
2interior gas pressure slippage is not still more than P
0, then at peephole G
1k
2the left side at a distance of 5m place parallel construction peephole G
1k
3, and the spacing G of construction depth distance strike long drill 6
1k
3h
3=5m, so just constantly approaches strike long drill 6.
Suppose to find peephole G in observation cycle T
1k
3interior gas pressure slippage has exceeded P
0, this shows that the extraction radius R of strike long drill is between 5 ~ 10m.
Subsequently at peephole G
1k
3the left side at a distance of 5m place parallel construction peephole G
1k
4, and the spacing G of construction depth distance strike long drill 6
1k
4h
4=7.5m; Peephole G is found in observation cycle T
1k
4interior gas pressure slippage is not more than P
0, this shows that the extraction radius R of strike long drill is between 5 ~ 7.5m.Because the trueness error of the mash gas pumping drilling of setting is determined between 0.5 ~ 1.5m, can determine at observation point G
1extraction radius be 6m.We are designed to 12m when the spacing of wells of this work plane trends of design long drilled holes subsequently, improve face gas extraction rate, avoid the generation of gas exceeding limit accident, have received good effect.
Preferably, in above-mentioned steps 51, also step 52 is comprised: as peephole G
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is not depressurized to after observation cycle T
0under, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, until peephole G
1k
n+m+aon vacuum table G
1k
n+m+ab
n+m+adesirable value P is depressurized to after observation cycle T
0under, now, described peephole G
1k
n+m+aend-to-end distance help the distance of the described strike long drill of 5 sides to be G near lane
1k
n+m+ah
n+m+a, and G
1k
n+mh
n+mbe greater than G
1k
n+m+ah
n+m+a(wherein a be more than or equal to 1 natural number); Then in above-mentioned steps 6, determine described observation point G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+m+ah
n+m+abetween.
Continue above-described embodiment, in order to seek accurately to determine strike long drill gas pumping radius R, can continue at peephole G
1k
4the left side at a distance of 5m place parallel construction peephole G
1k
5, and the spacing G of construction depth distance strike long drill 1
1k
5h
5=6.25m; Peephole G is found in observation cycle T
1k
5interior gas pressure slippage has exceeded P
0, the extraction radius R of accurate strike long drill is between 6.25 ~ 7.5m further.Due to extraction radius R be 6.25m or for 7.5m time, the methane gas pressure in its corresponding peephole all decrease beyond desirable value P
0, the extraction radius R of the strike long drill measured by the method is more accurate.Can accurately determine at observation point G
1extraction radius be 7m.14m is designed to subsequently when the spacing of wells of this work plane trends of design long drilled holes, 2 gas pumping drill sites 4 are arranged altogether at this work plane, totally 40 strike long drills 6 have received good extracting result, face gas extraction rate improves 23%, avoid the generation of gas exceeding limit accident, have received good effect.
Preferably, as Figure 1-3, lane side 5 also offers second observation point G
2, and at observation point G
2place, the action of executable operations step 3-step 6, determines at observation point G
2the strike long drill gas pumping radius R at place
2at G
2k
nh
nto G
2k
n+m+ah
n+m+abetween, then determine strike long drill gas pumping radius R=(R
1+ R
2)/2.
Due to, strike long drill 6 is longer, and single hole hole depth can reach more than 1000m, in order to its gas pumping radius of further Accurate Determining, lane side 5 offers second observation point G
2, and according to step 3-step 6, determine at observation point G
2the strike long drill gas pumping radius R at place
2at G
2k
nh
nto G
2k
n+m+ah
n+m+abetween, then the strike long drill gas pumping radius that two observation point places are measured is averaged, determine strike long drill gas pumping radius R=(R
1+ R
2)/2, measurement result is more accurate.
Certainly multiple observation point G can be set as required
n, Ji lane side 5 on offer N (N be more than or equal to 1 natural number) individual observation point, respectively at each observation point G
1, G
2..., G
nplace executable operations step 3-step 6, determines at each observation point G
1, G
2..., G
nthe strike long drill gas pumping radius R at place
1, R
2..., R
n, then strike long drill gas pumping radius R=(R is determined
1+ R
2..., R
n)/N.Improve the accuracy of strike long drill gas pumping radius R.
The measuring method at each observation point place all with first observation point G
1the measuring method at place is identical, does not repeat them here.
Preferably, as shown in Figure 1, three strike long drills 6 are offered in construction coal 1, the wherein air return way 2 of Article 1 strike long drill 6 in construction coal 1, the haulage gate 3 of Article 3 strike long drill 6 in construction coal 1, Article 2 strike long drill 6 is arranged between Article 1 strike long drill 6 and Article 3 strike long drill 6; The lane of air return way 2 side 5 arranges N number of observation point, and according to above-mentioned steps 3-step 6 calculate the strike long drill gas pumping radius R of Article 1 strike long drill 6 ', the lane of haulage gate 3 side 5 arranges N number of observation 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 ", then strike long drill gas pumping radius R=(R '+R ")/2 is determined.
Owing to offering three strike long drills 6 in construction coal 1, or arrange many strike long drills 6, only measure the strike long drill gas pumping radius of a strike long drill, result is accurate not.Then in order to Accurate Measurement more goes out strike long drill gas pumping radius, the lane of air return way 2 side 5 arranges N number of observation point, and according to above-mentioned steps 3-step 6 calculate the strike long drill gas pumping radius R of Article 1 strike long drill 6 ', the lane of haulage gate 3 side 5 arranges N number of observation 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 ", determine strike long drill gas pumping radius R=(R '+R ")/2.By all measuring the every bar strike long drill 6 near lane side 5, improve the accuracy of measurement.
Preferably, peephole G
1k
1, peephole G
1k
2..., G
1k
n..., G
n+mk
n+mall be disposed in same level, it is all vertical with strike long drill 6.The peephole that each coal-face is arranged, all in same level, and it is vertical with strike long drill 6.In same level, gas content is roughly the same, the degree of accuracy of measurement can be improved, overcome the existing direction along strike long drill 6 on the other hand and arrange peephole, and cause construction, research cycle long, and construction cost is very high, enterprise cannot bear, and inaccurate, the insecure defect of test result.
Preferably, the methane gas capacity X in described strike long drill and between methane gas pressure P parabolically property change,
X=α P
1/2, wherein, X is methane gas capacity, and unit is: m
3/ t;
α is coal seam gas-bearing capacity coefficient, and unit is: m
3/ (tMpa
1/2);
P is the original methane gas pressure in peephole, and unit is: MPa;
Wherein step-down desirable value P
0=0.51P.
After taking out coal-bed gas in advance, must test to the outstanding effect of Gas pre-drainage control, one of index of its inspection is that the pre-pumping rate of coal-bed gas is greater than 30%, and the gas bearing capacity namely after extraction is less than more than 70% before extraction.Under guarantee commercial Application error allows prerequisite, gas pressure P and gas bearing capacity X also exists a parabolic relation, that is: X=α P
1/2, X is methane gas capacity, and unit is: m
3/ t; α is coal seam gas-bearing capacity coefficient, and unit is: m
3/ (tMpa
1/2); P is the original methane gas pressure in peephole, and unit is: MPa.Therefore, also there is parabolic relation in the ratio that before and after extraction, gas bearing capacity reduces and the ratio that gas pressure reduces.If the pre-pumping rate in coal seam is 30%, namely gas remainder quantity is 70% of original gas, knows now remaining gas pressure value P by calculating
1for 49% of original gas pressure value P, gas pressure slippage desirable value P
0=P-P
1=0.51P.
Preferably, also comprise the steps: the opening sealing strike long drill 6 in step 4, outwards pump gas in gas pumping field 4 by gas pump; Carry out sealing of hole by professional and technical personnel, gas pressure, the gas density observed in each peephole, and to make a record, have special messenger to carry out data preparation, compare and analyze, and provide observation report material.
Each vacuum table is connected with external detection device respectively, monitored by external monitoring devices and record the change of the methane gas pressure P on each described vacuum table, and the distance GKH between the corresponding described strike long drill of the end-to-end distance recording each described peephole, calculate strike long drill gas pumping radius R by external monitoring devices.By external monitoring devices, such as computer installation, carries out recording, calculating, improves operating efficiency and accuracy.
Each work plane in construction coal all performs above-mentioned steps 2-step 6, strike long drill gas pumping radius R can be determined more exactly.
Thus, this strike long drill gas pumping radius assay method, break the mode in the cloth hole that extraction borehole is parallel with peephole in traditional gas drilling extraction radius assay method, creatively propose the new method that applicable strike long drill measures peephole gas pressure, variation ofgas density, namely peephole and extraction borehole are mutually vertical, and multiple observation point can be arranged along strike long drill direction, for the mensuration of strike long drill gas pumping radius provides new thinking and countermeasure, fill up domestic blank.
Which overcome in traditional gas drilling extraction radius assay method, because arrange that several parallel strike long drill is not only constructed, research cycle is long, and construction cost is very high, and enterprise cannot bear; Long construction period also can cause gas loss in boring to cause the shortcoming and defect such as test result is inaccurate, unreliable in addition, explore the new method that a kind of strike long drill gas pumping radius measures, for the design of strike long drill and construction provide scientific basis and theoretical direction.
Its construction works amount is less, construction technology is simple, expense is low, and multiple observation point can be selected to carry out test observation according to actual conditions, and the degree of accuracy that extraction radius measures is higher.
As required, above-mentioned each technical scheme can be combined, to reach best-of-breed technology effect.
Above-described is only principle of the present invention and preferred embodiment.It should be pointed out that for the person of ordinary skill of the art, on the basis of the principle of the invention, other modification some can also be made, also should be considered as protection scope of the present invention.
Claims (10)
1. a strike long drill gas pumping radius assay method, is characterized in that, comprise the steps:
Step 1: offer at least one strike long drill in construction coal;
Step 2: help in lane and offer an observation point G
1,
Step 3: at described observation point G
1place offers peephole G
1k
1, and described peephole G
1k
1arrange perpendicular to described strike long drill, described peephole G
1k
1end-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
1h
1, and at described peephole G
1k
1on vacuum table G is installed
1k
1b
1;
Step 4: observe described vacuum table G
1k
1b
1on pressure change, described peephole G
1k
1interior original methane gas force value is P, and after observation cycle T, observes described vacuum table G
1k
1b
1on pressure whether drop to desirable value P
0;
Step 41: as described in vacuum table G
1k
1b
1do not drop to desirable value P
0, then repeat at observation point G
1place offers peephole, and performs the action of above-mentioned steps 3 and step 4, until at described observation point G
1the peephole G that place offers
1k
non vacuum table G
1k
nb
ndesirable value P is depressurized to after observation cycle T
0under, now, described peephole G
1k
nend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
nh
n, and, G
1k
nh
nbe less than G
1k
n-1h
n-1(wherein n be more than or equal to 2 natural number);
Step 5: the action performing step 3 again, at described observation point G
1place offers peephole G
1k
n+1, and perform the action of above-mentioned steps 4, observe peephole G
1k
n+1on described vacuum table G
1k
n+1b
n+1, after observation cycle T, whether be depressurized to desirable value P
0under,
Step 51: as described in vacuum table G
1k
n+1b
n+1on the pressure drop of methane gas to desirable value P
0under, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, until at described observation point G
1the peephole G that place offers
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is not depressurized to after observation cycle T
0under, now, described peephole G
1k
n+mend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
n+mh
n+m, and, G
1k
nh
nbe less than G
1k
n+mh
n+m(wherein m be more than or equal to 1 natural number);
Step 6: determine at described observation point G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+mh
n+mbetween.
2. a kind of strike long drill gas pumping radius assay method according to claim 1, is characterized in that, in above-mentioned steps 51, also comprise step 52: as described in peephole G
1k
n+mon vacuum table G
1k
n+mb
n+mdesirable value P is not depressurized to after observation cycle T
0under, then repeat at observation point G
1place offers peephole, and repeats the action of above-mentioned steps 3 and step 4, until peephole G
1k
n+m+aon vacuum table G
1k
n+m+ab
n+m+adesirable value P is depressurized to after observation cycle T
0under,
Now, described peephole G
1k
n+m+aend-to-end distance be G near the distance of the described strike long drill of described lane side side
1k
n+m+ah
n+m+a, and G
1k
n+mh
n+mbe greater than G
1k
n+m+ah
n+m+a(wherein a be more than or equal to 1 natural number);
Then in above-mentioned steps 6, determine described observation point G
1the strike long drill gas pumping radius R at place
1at G
1k
nh
nto G
1k
n+m+ah
n+m+abetween.
3. a kind of strike long drill gas pumping radius assay method according to claim 2, is characterized in that, help also offer second observation point G in described lane
2, and at described observation point G
2place, the action of executable operations step 3-step 6, determines at described observation point G
2the strike long drill gas pumping radius R at place
2at G
2k
nh
nto G
2k
n+m+ah
n+m+abetween, then determine strike long drill gas pumping radius R=(R
1+ R
2)/2.
4. a kind of strike long drill gas pumping radius assay method according to claim 3, is characterized in that, help in described lane offer N (N be more than or equal to 1 natural number) individual observation point, respectively at each observation point G
1, G
2..., G
nplace executable operations step 3-step 6, determines at each observation point G
1, G
2..., G
nthe strike long drill gas pumping radius R at place
1, R
2..., R
n, then strike long drill gas pumping radius R=(R is determined
1+ R
2..., R
n)/N.
5. a kind of strike long drill gas pumping radius assay method according to claim 4, it is characterized in that, three strike long drills are offered in described construction coal, the wherein air return way of strike long drill described in Article 1 in construction coal, the haulage gate of strike long drill described in Article 3 in construction coal, strike long drill described in Article 2 to be arranged in described in strike long drill described in Article 1 and Article 3 between strike long drill;
Help in the described lane of described air return way and N number of described observation point be set, and according to above-mentioned steps 3-step 6 calculate the strike long drill gas pumping radius R of strike long drill described in Article 1 ',
Help in the described lane of described haulage gate and N number of described observation point be set, and calculate the strike long drill gas pumping radius R of strike long drill described in Article 3 according to above-mentioned steps 3-step 6 ",
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 claim 1-5, is characterized in that, described peephole G
1k
1, described peephole G
1k
2..., described G
1k
n..., described G
n+mk
n+mall be disposed in same level, it is all vertical with described strike long drill.
7. a kind of strike long drill gas pumping radius assay method according to claim 6, is characterized in that, the methane gas capacity X in described strike long drill and between methane gas pressure P parabolically property change,
X＝αP
1/2，
Wherein, X is methane gas capacity, and unit is: m
3/ t;
α is coal seam gas-bearing capacity coefficient, and unit is: m
3/ (tMpa
1/2);
P is methane gas pressure, and unit is: MPa;
Wherein step-down desirable value P
0=0.51P.
8. a kind of strike long drill gas pumping radius assay method according to claim 1, is characterized in that, also comprise the steps: the opening sealing described strike long drill in step 4, outwards pump gas in gas pumping field by gas pump.
9. a kind of strike long drill gas pumping radius assay method according to claim 1, it is characterized in that, each described vacuum table is connected with external detection device respectively, monitored by external monitoring devices and record the change of the methane gas pressure P on each described vacuum table, and the distance GKH between the corresponding described strike long drill of the end-to-end distance recording each described peephole, calculate strike long drill gas pumping radius R by described external monitoring devices.
10. a kind of strike long drill gas pumping radius assay method according to claim 1, is characterized in that, each work plane in construction coal all performs above-mentioned steps 2-step 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410400097.5A CN104295289B (en) | 2014-08-14 | 2014-08-14 | Gas extraction radius determining method for strike long drilled hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410400097.5A CN104295289B (en) | 2014-08-14 | 2014-08-14 | Gas extraction radius determining method for strike long drilled hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104295289A true CN104295289A (en) | 2015-01-21 |
| CN104295289B CN104295289B (en) | 2017-05-10 |
Family
ID=52315206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410400097.5A Active CN104295289B (en) | 2014-08-14 | 2014-08-14 | Gas extraction radius determining method for strike long drilled hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104295289B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696004A (en) * | 2015-01-30 | 2015-06-10 | 河南理工大学 | Measurement method of effective extracting radius of bedding boreholes based on content of residual gas |
| CN105134169A (en) * | 2015-10-10 | 2015-12-09 | 中煤科工集团重庆研究院有限公司 | Method for measuring regional gas extraction radius by using gas extraction measurement data |
| CN105804787A (en) * | 2016-03-28 | 2016-07-27 | 西南石油大学 | Method for measuring fracture development height of coal covering rock on stope face of coal mine |
| CN106401557A (en) * | 2016-08-31 | 2017-02-15 | 安徽理工大学 | Method for determining drill hole effective extracting radius by testing coal seam gas content and gas pressure jointly |
| CN106988732A (en) * | 2017-05-23 | 2017-07-28 | 山西潞安环保能源开发股份有限公司 | Online measurement method for coal mine gas extraction radius |
| CN110219699A (en) * | 2019-04-24 | 2019-09-10 | 中国矿业大学 | A kind of measurement device and measuring method of the effective radius of influence of mash gas pumping drilling |
| CN111535800A (en) * | 2020-04-16 | 2020-08-14 | 湘潭大学 | Method for measuring gas pressure of downward borehole of environment-friendly water-containing coal seam |
| CN113123785A (en) * | 2021-03-18 | 2021-07-16 | 太原理工大学 | Method for measuring and calculating standard effective extraction radius of coal mine gas extraction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1011866A1 (en) * | 1981-09-18 | 1983-04-15 | Институт проблем комплексного освоения недр АН СССР | Method of degassing coal beds being mined |
| CN101824982A (en) * | 2010-04-19 | 2010-09-08 | 中国矿业大学 | Coal bed gas drainage effective radius measuring method |
| CN103134448A (en) * | 2013-01-29 | 2013-06-05 | 河南理工大学 | Test method of drill hole gas extraction effective radius |
| CN103698490A (en) * | 2013-12-25 | 2014-04-02 | 安徽理工大学 | Borehole gas drainage radius testing device |
-
2014
- 2014-08-14 CN CN201410400097.5A patent/CN104295289B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1011866A1 (en) * | 1981-09-18 | 1983-04-15 | Институт проблем комплексного освоения недр АН СССР | Method of degassing coal beds being mined |
| CN101824982A (en) * | 2010-04-19 | 2010-09-08 | 中国矿业大学 | Coal bed gas drainage effective radius measuring method |
| CN103134448A (en) * | 2013-01-29 | 2013-06-05 | 河南理工大学 | Test method of drill hole gas extraction effective radius |
| CN103698490A (en) * | 2013-12-25 | 2014-04-02 | 安徽理工大学 | Borehole gas drainage radius testing device |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696004A (en) * | 2015-01-30 | 2015-06-10 | 河南理工大学 | Measurement method of effective extracting radius of bedding boreholes based on content of residual gas |
| CN105134169A (en) * | 2015-10-10 | 2015-12-09 | 中煤科工集团重庆研究院有限公司 | Method for measuring regional gas extraction radius by using gas extraction measurement data |
| CN105804787A (en) * | 2016-03-28 | 2016-07-27 | 西南石油大学 | Method for measuring fracture development height of coal covering rock on stope face of coal mine |
| 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 |
| CN106401557A (en) * | 2016-08-31 | 2017-02-15 | 安徽理工大学 | Method for determining drill hole effective extracting radius by testing coal seam gas content and gas pressure jointly |
| 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 | Online measurement method for coal mine gas extraction radius |
| CN110219699A (en) * | 2019-04-24 | 2019-09-10 | 中国矿业大学 | A kind of measurement device and measuring method of the effective radius of influence of mash gas pumping drilling |
| CN111535800A (en) * | 2020-04-16 | 2020-08-14 | 湘潭大学 | Method for measuring gas pressure of downward borehole of environment-friendly water-containing coal seam |
| 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 |
| CN113123785A (en) * | 2021-03-18 | 2021-07-16 | 太原理工大学 | Method for measuring and calculating standard effective extraction radius of coal mine gas 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104295289B (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104295289A (en) | Gas extraction radius determining method for strike long drilled hole | |
| CN102322294B (en) | Comprehensive geological prediction method for karst tunnel construction | |
| CN105909254B (en) | Projecting coal bed bottom plate, which is faced upward, wears the advanced area cover coal roadway tunneling method of layer directional hole | |
| WO2015158153A1 (en) | Water conservation method used in coal mining process | |
| CN112465330B (en) | Failure evaluation method for underground coal mine gas extraction drill hole | |
| CN104481587A (en) | Large-mining depth and long-span fully-mechanized top-coal caving face roof sandstone fracture water detecting and preventing method | |
| CN104373118A (en) | Measurement method for effective extraction radius of drill hole | |
| CN110778363A (en) | Method for determining coal body stress peak area and early warning through multi-parameter measurement while drilling | |
| CN114352299B (en) | Parallel advanced ultra-deep geological prediction method under construction condition of TBM (Tunnel boring machine) of deep-buried long tunnel | |
| CN104358559B (en) | Method for measuring effective coal-mine gas extraction radius | |
| Meng et al. | In situ investigation and numerical simulation of the failure depth of an inclined coal seam floor: a case study | |
| CN109779634B (en) | Method for determining position of fractured hard top plate of coal mine ground vertical well | |
| CN114087019B (en) | Method for preventing and controlling huge-thickness heterogeneous sandstone water damage area | |
| CN106401557B (en) | A kind of method of joint test coal seam gas-bearing capacity and the determining effective extraction radius that drills of gas pressure | |
| CN106032750B (en) | Geological logging instrument based on drilling energy spectrum | |
| CN101892842B (en) | Method for uncovering coal in vertical shaft | |
| CN112446560A (en) | Shale gas horizontal well borehole cleaning comprehensive monitoring and evaluation system | |
| CN115829398A (en) | High-precision exploration and evaluation method for coal seam floor branch drill hole | |
| CN104847333A (en) | Method for measuring coal seam gas extraction radius | |
| CN104533379A (en) | Underground coal gasifier and gasifier combustion state determination method | |
| Kawata et al. | The relationship between TBM data and rockburst in long-distance tunnel, Pahang-Selangor raw water transfer tunnel, Malaysia | |
| CN114837657A (en) | Coal mine underground gas extraction borehole failure evaluation system | |
| CN104374589A (en) | Method for accurately measuring gas phase fracture disturbance range | |
| CN103591980B (en) | Monitor the through method of underground coal gasification passage, Apparatus and system | |
| CN114019577A (en) | Method, computer equipment and medium for advanced exploration of water-rich property in front of driving face |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |