CN107503727A - A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method - Google Patents
A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 61
- 239000003245 coal Substances 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims description 13
- 241000209094 Oryza Species 0.000 claims description 9
- 235000007164 Oryza sativa Nutrition 0.000 claims description 9
- 235000009566 rice Nutrition 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 241000196324 Embryophyta Species 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
- 239000010720 hydraulic oil Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract 1
- 238000005457 optimization Methods 0.000 abstract 1
- 238000007569 slipcasting Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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
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- 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
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention discloses a kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring to investigate method, belong to underground coal mine hydraulic fracturing technical field, the problems such as layer hydraulic fracturing scope is difficult to assess, fracturing effect only relies on the uncertainty of later stage extraction single factor exploration is worn for colliery；It is mainly comprised the following steps, corresponding hydraulic fracturing is selected to drill, around it different azimuth according to golden section set the spacing of wells arrange stress test drilling, carry out pressure break before, fracturing process, post-fracturing stress intensity monitoring, hydraulic fracturing coverage is judged according to test result；Investigated using this method to hydraulic fracturing coverage, technology is simple, and quantities is small, reliable results, and wearing a layer hydraulic fracturing process for further optimization provides technical foundation.
Description
Technical field
The invention belongs to underground coal mine hydraulic fracturing technical field, and in particular to hydraulic fracturing coverage investigates method.
Background technology
China's coal seam reservoirs belong to low air permeability coal seam more and be rich in gas, increase gas permeability of coal seam be advantageous to gas effusion so that
Coal seam gas-bearing capacity is reduced, to ensure Safety of Coal Mine Production and promote gas pumping.Hydraulic fracturing technology is as a kind of coal mine
The lower anti-reflection measure in subterranean zone has been widely used, and obtains good result.However, influence model for underground coal mine hydraulic fracturing
Still in the exploratory stage, it is dense to only rely on later stage gas pumping at present for underground coal mine hydraulic fracturing investigation so far for the investigation enclosed
Degree, flow and the relation of time weigh fracturing effect, only rely on later stage driving and back production record case to judge waterpower
Pressure break scope, lack more reliable underground coal mine hydraulic fracturing coverage and investigate method, be unfavorable for underground coal mine water and force
Split the perfect and progressive of design.Therefore, it is necessary to which developing more reliable underground coal mine hydraulic fracturing coverage investigates method.
The content of the invention
For deficiencies of the prior art, a layer waterpower pressure is worn based on in-situ stress monitoring the invention provides a kind of
Split scope and investigate method, party's law technology is simple, reliable results, and achievable underground coal mine wears commenting for layer hydraulic fracturing coverage
Estimate.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method, comprises the following steps：
Step 1：In-situ stress monitoring reconnaissance：The O points centered on fracturing borehole borehole bottom location, moved towards along bottom plate lane in coal seam
Stress monitoring point A, B are selected in O points side in top plate plant tilting, and OA grows 30 meters, 50 meters of OB length, is ± 120 ° along with OA angular separations
Both direction selectes stress monitoring point C, D and E, F, OC=OE=30 rice, OD=OF=50 rice respectively；A, B, C, D, E, F distinguish
As stress monitoring drilling I, stress monitoring drilling II, stress monitoring drilling III, stress monitoring drilling IV, stress monitoring drilling
Vth, the borehole bottom location of stress monitoring drilling VI；30 meters toward one lateral deviation of A points of bottom plate lane internal pressure ceasma is opening for stress monitoring drilling I
Hole site；Bottom plate lane internal pressure ceasma is toward the position of opening that 50 meters of one lateral deviation of B points is stress monitoring drilling II；Bottom plate lane internal pressure ceasma
Toward one lateral deviation of C points, 15 meters of position of opening for stress monitoring drilling III and stress monitoring drilling V；Bottom plate lane internal pressure ceasma is toward D points
25 meters of side is the position of opening of stress monitoring drilling IV and stress monitoring drilling VI；
Step 2：Stress monitoring drilling construction：It is accurate in each stress monitoring drilling position of opening arrangement drill site, rigging up
The amount of preparing enough drilling rod and matched 75mm drill bits and 42mm drill bits, drill first with 75mm drill bits, discharge hole to be drilled
Drilling rod is withdrawn from after coal dust, 42mm drill bits is changed and continues to creep into along original direction, it is hole to be drilled be not then exhausted from coal dust after continue to creep into
0.5m, withdraw from drilling rod；The construction of all stress monitoring drillings is completed in this way；
Step 3：Strain gauge is installed：The strain gauge alignment stress for connecting oil pressure pipe is drilled first, simultaneously
Mounting rod is connected, installation head groove insertion sensor bottom iron pin, is smoothed out with the fingers along oil pressure pipe；Then sensor is pushed into coal seam
It is interior, exit mounting rod；Finally data logger is connected in oil pipe end；
Step 4：Stress monitoring drilling and sealing：First toward being sent into Grouting Pipe and slurry recovering tube in drilling, length in slip casting pore
6m, slurry recovering tube be inserted to drilling bottom, using AB glue block aperture, Grouting Pipe connection high-pressure injection pump, start slip casting, injecting paste material with
The sealing material of investigated fracturing borehole is consistent, blocks slurry recovering tube after slurry recovering tube has slurries outflow, continues slip casting, treats that stress passes
Sensor pressure stops slip casting after being more than 4Mpa；
Step 5：Stress test before hydraulic fracturing：Sealing of hole described in completing step 4, reads each stressometer pressure after 5 hours
Value, if pressure is down to below 4Mpa, oil pressure is squeezed into oil pressure pipe using manual portable oil pressure pump, returns stressometer pressure
4~4.5Mpa is risen to, continues to monitor the numerical value 5 hours, beginning stress monitoring after pressure stabilisation, records and gathers each in 15 days
Individual stressometer institute measuring pressure is changed with time, and last five days stress ranges monitored are labeled as into section A；
Step 6：Hydraulic fracturing process stress monitoring：Implement hydraulic fracturing, record hydraulic fracturing beginning and ending time, waterpower pressure
Stress data is gathered after splitting end, analyzes the change of hydraulic fracturing process stress, continues to monitor the change of the latter all internal stress of pressure break
Change, finally gather the stress data in this week, the excursion of stress in its excursion and fracturing process is merged into area
Between B；
Step 7：Data are exported after hydraulic fracturing, carry out data validity analysis, should according to obtained by step 5 and step 6
Power constant interval, judge that each direction farthest influences distance:
If, then the stress monitoring point do not influenceed by hydraulic fracturing；
If, then the stress monitoring point influenceed by hydraulic fracturing；
Step 8：According to step 7 acquired results, the effective borehole coordinate of farthest stress monitoring is demarcated, is sequentially connected these brills
Hole, draw a circle to approve hydraulic fracturing coverage.
Compared with prior art, the present invention has the following technical effect that：
1st, a kind of layer hydraulic fracturing scope of wearing based on stress monitoring of the present invention investigates method, can directly contact institute
Pressure break coal seam, the change of coal seam internal stress is monitored, what coverage and fracturing effect to hydraulic fracturing to make evaluation from, as a result
Reliably, foundation is provided for hydraulic fracturing job design.
2nd, a kind of layer hydraulic fracturing scope of wearing based on stress monitoring of the present invention investigates method, has taken into full account water
The difference split and influence direction is forced, arrangement investigates drilling on the direction that three angles are 120 °, and quantities is few, and technology is simply easy
Operation, hydraulic fracturing coverage demarcation method is simple, engineering construction efficiency high.
Brief description of the drawings
Fig. 1 is stress monitoring of the present invention drilling borehole bottom location schematic diagram；
Fig. 2 is profiles of the Fig. 1 along I-I direction；
Fig. 3 is profiles of the Fig. 1 along II-II direction；
Fig. 4 is profiles of the Fig. 1 along III-III direction；
Fig. 5 is strain gauge of the present invention installation and drilling and sealing schematic diagram；
Fig. 6 delimit hydraulic fracturing coverage schematic diagram for the present invention.
In accompanying drawing：1-pressure break hole；21-stress monitoring drilling I；22-stress monitoring drilling II；23-stress monitoring bores
Hole III；24-stress monitoring drilling IV；25-stress monitoring drilling V；26-stress monitoring drilling VI；3-bottom plate lane；4-coal
Layer；5-oil pressure pipe；6-crustal stress sensor；7-crustal stress recorder；8-Grouting Pipe；9-slurry recovering tube；10-hydraulic fracturing
Coverage.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method, comprises the following steps：
Step 1：As shown in figure 1, the O centered on the borehole bottom location of pressure break hole, selected first in the top plate plant tilting of coal seam 4 to answer
Power test point A, B, C, D, E, F, A, B point are located at bottom plate lane 3 and walk upward O points side, OA=30 rice, OB=50 rice, edge and OA side
Stress monitoring point C, D and E, F, OC=OE=30 rice, OD=OF=50 rice are selected respectively to the both direction that angle is ± 120 °.
As shown in Figure 2,3, 4, I 21 position of opening of stress monitoring drilling are that the internal pressure ceasma 1 of bottom plate lane 3 deviates toward A points side
30 meters, borehole bottom location is A points；Stress monitoring II 22 position of opening of drilling are that the internal pressure ceasma 1 of bottom plate lane 3 deviates 30 toward B points side
Rice, borehole bottom location is B points；Stress monitoring drilling III 23 and stress monitoring V 25 position of opening of drilling are the internal pressure ceasma 1 of bottom plate lane 3
Deviate 15 meters toward C points side, borehole bottom location is respectively C and E points；Stress monitoring drilling IV 24 and stress monitoring VI 26 perforates of drilling
Position is that the internal pressure ceasma 1 of bottom plate lane 3 deviates 15 meters toward D points side, and borehole bottom location is respectively D and F points, according to drilling start-stop position
Calculate each stress monitoring hole hole depth and inclination angle.
Step 2：Each stress monitoring drilling position of opening arrangement drill site, rigging up, prepares enough brills in bottom plate lane 3
Bar and matched 75mm drill bits and 42mm drill bits, bore direction, inclination angle and hole depth according to obtained by step 1, regulation are bored
Machine drill enters reversely, is drilled first with 75mm drill bits, withdraws from drilling rod after discharge coal dust hole to be drilled, changes 42mm drill bits and continue along original
The direction drilling come, it is hole to be drilled not to be then exhausted from continuing after coal dust to creep into 0.5m, withdraw from drilling rod；All stress are completed in this way
Monitor the construction of drilling.
Step 3：Prepare 6 strain gauges 6,6 with 5,6 crustal stress recorders 7 of oil pressure pipe, enough sensors peace
Bar is filled, as shown in figure 5, the strain gauge 6 for connecting oil pressure pipe 5 is directed at stress drilling first, while mounting rod is connected, pacifies
Head groove insertion sensor bottom iron pin is filled, is smoothed out with the fingers along oil pressure pipe 5；Then sensor 6 is pushed in coal seam 4, exits installation
Bar；Finally data logger 7 is connected in oil pipe end；Complete the installation of strain gauge.
Step 4：After strain gauge installation terminates, as shown in figure 5, being sent into Grouting Pipe 8 and slurry recovering tube 9, note toward drilling is interior
Length 6m in the hole of pipe 8 is starched, slurry recovering tube 9 is inserted to drilling bottom, blocks aperture using AB glue, Grouting Pipe connection high-pressure injection pump, starts
Slip casting, injecting paste material is consistent with the sealing material of investigated fracturing borehole 1, and slurry recovering tube is blocked after slurry recovering tube 9 has slurries outflow
9, continue slip casting, stop slip casting after strain gauge pressure is more than 4Mpa.
Step 5：Complete step 4 described in sealing of hole, each stressometer pressure value is read after 5 hours, if pressure be down to 4Mpa with
Under, then oil pressure is squeezed into oil pressure pipe 5 using manual portable oil pressure pump, stressometer pressure is gone up to 4~4.5Mpa, continue
Monitor the numerical value 5 hours, beginning stress monitoring after pressure stabilisation, record and gather in 15 days each stressometer institute's measuring pressure with
The change of time, last five days stress ranges monitored are labeled as section A.
Step 6：Hydraulic fracturing pipeline is connected, after checking each equipment normal operation, starts hydraulic fracturing, it is a length of during pressure break
24 hours, the hydraulic fracturing beginning and ending time is recorded, hydraulic fracturing gathers stress data after terminating, analyze hydraulic fracturing process stress
Change, continue monitor the latter all internal stress of pressure break change, the stress data in this week is finally gathered, by its excursion
Interval B is merged into the excursion of stress in fracturing process.
Step 7：In-situ stress monitoring data are exported, carry out data validity analysis, should according to obtained by step 5 and step 6
Power constant interval, judge that each direction farthest influences distance:
If, then the stress monitoring point do not influenceed by hydraulic fracturing；
If, then the stress monitoring point influenceed by hydraulic fracturing.
Step 8：According to step 7 acquired results, the effective borehole coordinate of farthest stress monitoring is demarcated, as shown in figure 3, successively
These drillings are connected, it is final to draw a circle to approve hydraulic fracturing coverage 10.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this
Among the right of invention.
Claims (1)
1. a kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method, it is included in base plate tunnel and implements to wear a layer waterpower
Fracturing borehole and sealing of hole, it is characterised in that comprise the following steps：
A. the O points centered on fracturing borehole borehole bottom location, along bottom plate lane (3) trend, O points side is selected in coal seam (4) top plate plant tilting
Determine stress monitoring point A, B, 30 meters of OA length, OB grows 50 meters, and edge is selected and answered respectively with the both direction that OA angular separations are ± 120 °
Power monitoring point C, D and E, F, OC=OE=30 rice, OD=OF=50 rice；
B. drilled in bottom plate lane (3) internal pressure ceasma (1) orifice position toward one lateral deviation of A points, 30 meters of I (21) of construction stress monitoring drilling
I (21) borehole bottom location is A points；Monitored in bottom plate lane (3) internal pressure ceasma (1) orifice position toward one lateral deviation of B points, 50 meters of construction stress
Drill II (22), and II (22) borehole bottom location of drilling is B points；In bottom plate lane (3) internal pressure ceasma (1) orifice position toward the lateral deviation of C points one
V (25) of 15 meters of construction stress monitoring III (23) of drilling and stress monitoring drilling, III (23) borehole bottom location of drilling is C points, drilling V
(25) borehole bottom location is E points；Bored in bottom plate lane (3) internal pressure ceasma (1) orifice position toward one lateral deviation of D points, 25 meters of construction stress monitorings
VI (26) of hole IV (24) and stress monitoring drilling, IV (24) borehole bottom location of drilling is D points, and VI (26) borehole bottom location of drilling is F points；
Each stress monitoring drilling orifice to coal seam (4) floor section aperture is 75mm, is 42mm into coal seam (4) back aperture；
C. the strain gauge (6) for connecting oil pressure pipe (5) is pushed into each stress monitoring point along drilling using mounting rod, after
Implement drilling and sealing, whole stress monitoring drilling is filled during injection hole sealing, the outer section connection stress record of oil pressure pipe (5) at aperture
Instrument (7), using hand-driven oil hydraulic pump toward being pressed into hydraulic oil in oil pressure pipe, until stopping is suppressed when oil pressure pressure be 4~4.5MPa, it is complete
Installed into strain gauge (6)；Grouting Pipe (8) and slurry recovering tube (9) are inserted, aperture is blocked using AB glue, implements injection hole sealing, note
Whole drilling is filled during slurry；
D. the crustal stress change of 15 days is monitored before pressure break, 15 days internal stress changing rules is analyzed, determines the preceding coal seam internal stress of pressure break
Excursion [σmin,σmax], it is stress stability section A by the range set；
E. implement hydraulic fracturing, while carry out stress monitoring, stress monitoring is continued to after the completion of pressure break 5 days, gather pressure break mistake
Journey and post-fracturing stress data, analyze its changing rule, determine fracturing process and post-fracturing stress range [σ1,σ2],
It is stress disturbance constant interval B caused by pressure break by the range set；
F. each stress monitoring drilling hole stress constant interval A, B according to obtained by step d and step e, impacted stress prison is determined
Measuring point；
IfThen the stress monitoring point is not influenceed by hydraulic fracturing；
IfThen the stress monitoring point is influenceed by hydraulic fracturing；
G. coverage delimited：Determine that hydraulic fracturing influences point according to step f, find out 3 different footpaths as described in step b respectively
Farthest upwards to influence point, it is to wear the effective coverage of layer hydraulic fracturing to connect these three to put drawn a circle to approve scope with straight line
(10)。
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| CN201710970260.5A CN107503727B (en) | 2017-10-16 | 2017-10-16 | It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring |
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| CN201710970260.5A CN107503727B (en) | 2017-10-16 | 2017-10-16 | It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843391A (en) * | 2018-05-31 | 2018-11-20 | 天地科技股份有限公司 | A kind of coal seam high-pressure hydraulic evaluation of Fracturing Effect on Compact Sandstone method |
| CN109736779A (en) * | 2019-03-15 | 2019-05-10 | 吕梁学院 | A kind of pressure break radius measurement method of this coal seam hydraulic fracture |
| CN110259442A (en) * | 2019-06-28 | 2019-09-20 | 重庆大学 | A kind of coal measure strata hydraulic fracturing disrupted beds position recognition methods |
| CN110426501A (en) * | 2019-08-01 | 2019-11-08 | 重庆市能源投资集团科技有限责任公司 | A method of a layer hydraulic fracturing coverage is worn based on the determination of salinity measurement method |
| CN111173487A (en) * | 2019-12-25 | 2020-05-19 | 天地科技股份有限公司 | Monitoring method for regional hydraulic fracturing |
| CN112145073A (en) * | 2020-09-28 | 2020-12-29 | 中国矿业大学 | In-situ controllable coal and gas outburst process physical simulation method |
| CN113513313A (en) * | 2021-04-28 | 2021-10-19 | 中煤科工集团重庆研究院有限公司 | Experimental device and method for simulating coal seam hydraulic fracturing |
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| CN105156085A (en) * | 2015-09-11 | 2015-12-16 | 重庆大学 | Composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of underground coal mine |
| CN104594868B (en) * | 2015-01-29 | 2017-03-08 | 河南理工大学 | Multiparty control hydraulic fracturing anti-reflection outburst elimination method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843391A (en) * | 2018-05-31 | 2018-11-20 | 天地科技股份有限公司 | A kind of coal seam high-pressure hydraulic evaluation of Fracturing Effect on Compact Sandstone method |
| CN108843391B (en) * | 2018-05-31 | 2020-04-14 | 天地科技股份有限公司 | Method for evaluating high-pressure hydraulic fracturing effect of coal seam |
| CN109736779A (en) * | 2019-03-15 | 2019-05-10 | 吕梁学院 | A kind of pressure break radius measurement method of this coal seam hydraulic fracture |
| CN110259442A (en) * | 2019-06-28 | 2019-09-20 | 重庆大学 | A kind of coal measure strata hydraulic fracturing disrupted beds position recognition methods |
| CN110426501A (en) * | 2019-08-01 | 2019-11-08 | 重庆市能源投资集团科技有限责任公司 | A method of a layer hydraulic fracturing coverage is worn based on the determination of salinity measurement method |
| CN111173487A (en) * | 2019-12-25 | 2020-05-19 | 天地科技股份有限公司 | Monitoring method for regional hydraulic fracturing |
| CN111173487B (en) * | 2019-12-25 | 2022-02-08 | 天地科技股份有限公司 | Monitoring method for regional hydraulic fracturing |
| CN112145073A (en) * | 2020-09-28 | 2020-12-29 | 中国矿业大学 | In-situ controllable coal and gas outburst process physical simulation method |
| CN112145073B (en) * | 2020-09-28 | 2022-04-01 | 中国矿业大学 | In-situ controllable coal and gas outburst process physical simulation method |
| CN113513313A (en) * | 2021-04-28 | 2021-10-19 | 中煤科工集团重庆研究院有限公司 | Experimental device and method for simulating coal seam hydraulic fracturing |
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