CN107503727B - It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring - Google Patents
It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 65
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 9
- 238000011835 investigation Methods 0.000 title description 6
- 238000005553 drilling Methods 0.000 claims abstract description 57
- 239000003245 coal Substances 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims description 12
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- 238000007569 slipcasting Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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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
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- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
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- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention discloses a kind of, and layer hydraulic fracturing range of wearing based on in-situ stress monitoring investigates method, belong to underground coal mine hydraulic fracturing technical field, wears the problems such as layer hydraulic fracturing range is difficult to assess, fracturing effect only relies on the uncertainty of later period extraction single factor exploration for coal mine；It is mainly comprised the following steps, corresponding hydraulic fracturing is selected to drill, around it different direction according to golden section setting 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；It is investigated using this method to hydraulic fracturing coverage, technically simple, project amount is small, as a result reliably, wears a layer hydraulic fracturing process to advanced optimize and provides technical foundation.
Description
Technical field
The invention belongs to underground coal mine hydraulic fracturing technical fields, and in particular to hydraulic fracturing coverage investigates method.
Background technique
China's coal seam reservoirs more belong to low air permeability coal seam and be rich in gas, increase gas permeability of coal seam be conducive to gas evolution to
Coal seam gas-bearing capacity is reduced, to guarantee Safety of Coal Mine Production and promote gas drainage.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, influencing model for underground coal mine hydraulic fracturing
The investigation enclosed is at present still in the exploratory stage, and for underground coal mine hydraulic fracturing investigation, to only rely on later period gas drainage dense so far
Degree, flow and the relationship of time measure fracturing effect, only rely on later period driving and back production record case to judge waterpower
Pressure break range lacks more reliable underground coal mine hydraulic fracturing coverage and investigates method, is unfavorable for underground coal mine water and forces
Split the perfect and progress of design.Therefore, it is necessary to develop more reliable underground coal mine hydraulic fracturing coverage to investigate method.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of wears a layer waterpower pressure based on in-situ stress monitoring
It splits range and investigates method, this method is technically simple, as a result reliable, it can be achieved that 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 solutions:
It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring, comprising the following steps:
Step 1: it in-situ stress monitoring reconnaissance: using fracturing borehole borehole bottom location as center O point, moves towards along bottom plate lane in coal seam
Stress monitoring point A, B are selected in the point side O in top plate plant tilting, and 30 meters of OA long, 50 meters of OB long, edge is ± 120 ° with the angular separation OA
Both direction respectively select stress monitoring point C, D and E, F, OC=OE=30 meters, OD=OF=50 meters；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
V, the borehole bottom location of stress monitoring drilling VI；Bottom plate lane internal pressure ceasma is opening for stress monitoring drilling I toward 30 meters of one lateral deviation of A point
Hole site；Bottom plate lane internal pressure ceasma toward 50 meters of one lateral deviation of B point for stress monitoring drilling II position of opening；Bottom plate lane internal pressure ceasma
Toward 15 meters of one lateral deviation of the C point position of opening for stress monitoring drilling III and stress monitoring drilling V；Bottom plate lane internal pressure ceasma is toward D point
Position of opening of 25 meters of the side for stress monitoring drilling IV and stress monitoring drilling VI；
Step 2: stress monitoring drilling construction: arrange that drill site, rigging up are quasi- in each stress monitoring drilling position of opening
The amount of preparing enough drilling rod and matched 75mm drill bit and 42mm drill bit, drill first with 75mm drill bit, discharge hole to be drilled
Withdraw from drilling rod after coal dust, change 42mm drill bit and continue 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 withdraws from drilling rod；The construction of all stress monitoring drillings is completed in this way；
Step 3: strain gauge installation: first the strain gauge alignment stress drilling for connecting oil pressure pipe, simultaneously
Mounting rod is connected, installation head groove is embedded in sensor bottom end iron pin, smoothes 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: Grouting Pipe and slurry recovering tube, length in slip casting pore stress monitoring drilling and sealing: are sent into drilling first
6m, slurry recovering tube be inserted to drilling bottom, using AB glue block aperture, Grouting Pipe connect 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, pass to stress
Sensor pressure stops slip casting after being greater than 4Mpa；
Step 5: stress test before hydraulic fracturing: sealing of hole described in step 4 is completed, each stress meter pressure is read after 5 hours
Value, if pressure be down to 4Mpa hereinafter, if using manual portable oil pressure pump oil pressure is squeezed into oil pressure pipe, return stress meter pressure
4~4.5Mpa is risen to, continues to monitor the numerical value 5 hours, beginning stress monitoring after pressure stabilisation is recorded and acquired each in 15 days
A stress meter institute measuring pressure changes with time, and last five days stress ranges monitored are labeled as section A；
Step 6: hydraulic fracturing process stress monitoring: implementing hydraulic fracturing, records hydraulic fracturing beginning and ending time, waterpower pressure
Stress data is acquired after splitting, analyzes the variation of hydraulic fracturing process stress, continues the change for monitoring the latter all internal stress of pressure break
Change, finally acquire the stress data in this week, the variation range of stress in its variation range and fracturing process is merged into area
Between B；
Step 7: exporting data after hydraulic fracturing, carries out data validity analysis, answers according to obtained by step 5 and step 6
Power constant interval judges that each direction farthest influences distance:
IfThen the stress monitoring point is not influenced by hydraulic fracturing；
IfThen the stress monitoring point is influenced by hydraulic fracturing；
Step 8: according to step 7 acquired results, the effective borehole coordinate of farthest stress monitoring is demarcated, these brills are sequentially connected
Hydraulic fracturing coverage is drawn a circle to approve in hole.
Compared with prior art, the present invention has the following technical effect that
1, a kind of layer hydraulic fracturing range of wearing based on stress monitoring of the present invention investigates method, can directly contact institute
Pressure break coal seam monitors the variation of coal seam internal stress, so that the coverage and fracturing effect to hydraulic fracturing make evaluation, as a result
Reliably, foundation is provided for hydraulic fracturing job design.
2, a kind of layer hydraulic fracturing range of wearing based on stress monitoring of the present invention investigates method, has fully considered water
The difference split and influence direction is forced, arrangement investigates drilling on the direction that three angles are 120 °, and project amount is few, technically simple easy
Operation, hydraulic fracturing coverage demarcation method is simple, and engineering construction is high-efficient.
Detailed description of the invention
Fig. 1 is stress monitoring of the present invention drilling borehole bottom location schematic diagram；
Fig. 2 is sectional view of the Fig. 1 along I-I direction；
Fig. 3 is sectional view of the Fig. 1 along II-II direction；
Fig. 4 is sectional view 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 is that the present invention delimit hydraulic fracturing coverage schematic diagram.
In attached drawing: 1-pressure break hole；21-stress monitorings drilling I；22-stress monitorings drilling II；23-stress monitorings bore
Hole III；24-stress monitorings drilling IV；25-stress monitorings drilling V；26-stress monitorings drilling VI；3-bottom plate lanes；4-coals
Layer；5-oil pressure pipes；6-crustal stress sensors；7-crustal stress recorders；8-Grouting Pipes；9-slurry recovering tubes；10-hydraulic fracturings
Coverage.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring, comprising the following steps:
Step 1: as shown in Figure 1, using pressure break hole borehole bottom location as center O, it is selected first in 4 top plate plant tilting of coal seam 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 point side, OA=30 meters, OB=50 meters, along and the side OA
To angle be ± 120 ° both direction respectively select stress monitoring point C, D and E, F, OC=OE=30 meters, OD=OF=50 meters.
As shown in Figure 2,3, 4, I 21 position of opening of stress monitoring drilling are that 3 internal pressure ceasma 1 of bottom plate lane deviates toward the point side A
30 meters, borehole bottom location is A point；Stress monitoring II 22 position of opening of drilling deviate 30 toward the point side B for 3 internal pressure ceasma 1 of bottom plate lane
Rice, borehole bottom location are B point；Stress monitoring drilling III 23 and stress monitoring drill V 25 position of opening as 3 internal pressure ceasma 1 of bottom plate lane
Deviate 15 meters toward the point side C, borehole bottom location is respectively C and E point；Stress monitoring drilling IV 24 and stress monitoring VI 26 apertures of drilling
Position is 3 internal pressure ceasma 1 of bottom plate lane toward 15 meters of the point side D deviation, and borehole bottom location is respectively D and F point, 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 arranges that drill site, rigging up prepare enough brills in bottom plate lane 3
Bar and matched 75mm drill bit and 42mm drill bit are adjusted and are bored according to bore direction obtained by step 1, inclination angle and hole depth
Machine drill is drilled first with 75mm drill bit, withdraws from drilling rod after discharge coal dust hole to be drilled into reversed, is changed 42mm drill bit and is continued along original
The direction drilling come, hole to be drilled be not then exhausted from after coal dust continue 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 crustal stress recorders 7 of oil pressure pipe 5,6 of strain gauge 6,6, enough sensor peaces
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
It fills head groove and is embedded in sensor bottom end iron pin, smooth 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 is installed, as shown in figure 5, Grouting Pipe 8 and slurry recovering tube 9 are sent into drilling, note
Length 6m in 8 hole of pipe is starched, slurry recovering tube 9 is inserted to drilling bottom, blocks aperture using AB glue, and Grouting Pipe connects high-pressure injection pump, starts
Slip casting, injecting paste material is consistent with the sealing material of investigated fracturing borehole 1, blocks slurry recovering tube after slurry recovering tube 9 has slurries outflow
9, continue slip casting, stops slip casting after strain gauge pressure is greater than 4Mpa.
Step 5: complete step 4 described in sealing of hole, each stress meter 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, so that stress meter pressure is gone up to 4~4.5Mpa, continue
Monitor the numerical value 5 hours, beginning stress monitoring after pressure stabilisation, record and acquire in 15 days each stress meter institute's measuring pressure with
Last five days stress ranges monitored are labeled as section A by the variation of time.
Step 6: connection hydraulic fracturing pipeline after checking each equipment normal operation, starts hydraulic fracturing, and when pressure break is a length of
24 hours, the hydraulic fracturing beginning and ending time has been recorded, stress data is acquired after hydraulic fracturing, has analyzed hydraulic fracturing process stress
Variation, continue the variation for monitoring the latter all internal stress of pressure break, the stress data in this week finally acquired, by its variation range
Interval B is merged into the variation range of stress in fracturing process.
Step 7: export in-situ stress monitoring data carry out data validity analysis, answer according to obtained by step 5 and step 6
Power constant interval judges that each direction farthest influences distance:
IfThen the stress monitoring point is not influenced by hydraulic fracturing；
IfThen the stress monitoring point is influenced by hydraulic fracturing.
Step 8: according to step 7 acquired results, the effective borehole coordinate of farthest stress monitoring is demarcated, as shown in fig. 6, successively
These drillings are connected, it is final to draw a circle to approve hydraulic fracturing coverage 10.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (1)
1. a kind of layer hydraulic fracturing range of wearing based on in-situ stress monitoring investigates method, it is included in base plate tunnel implementation and wears a layer waterpower
Fracturing borehole and sealing of hole, which comprises the following steps:
A. using fracturing borehole borehole bottom location as center O point, along bottom plate lane (3) trend, the point side O is selected in coal seam (4) top plate plant tilting
Determine stress monitoring point A, B, 30 meters of OA long, 50 meters of OB long, selectes and answer respectively along the both direction for being ± 120 ° with the angular separation OA
Power monitoring point C, D and E, F, OC=OE=30 meters, OD=OF=50 meters；
B. I (21) are drilled eventually toward A point one lateral deviation, 30 meters of construction drills I (21) in bottom plate lane (3) internal pressure ceasma (1) orifice position
Hole location is set to A point；In bottom plate lane (3) internal pressure ceasma (1) orifice position toward B point one lateral deviation, 50 meters of construction drills II (22), drill
II (22) borehole bottom location is B point；In bottom plate lane (3) internal pressure ceasma (1) orifice position toward C point one lateral deviation, 15 meters of construction drills III
(23) and V (25) of drilling, III (23) borehole bottom location of drilling are C point, and V (25) borehole bottom location of drilling is E point；In bottom plate lane (3)
Internal pressure ceasma (1) orifice position is toward VI (26) of one lateral deviation of D point, 25 meters of construction drills IV (24) and drilling, the whole hole location in IV (24) that drill
It is set to D point, VI (26) borehole bottom location of drilling is F point；Each drilling orifice to coal seam (4) floor section aperture is 75mm, into coal
Layer (4) back aperture is 42mm；
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, when injection hole sealing fills entire drilling, oil pressure pipe (5) outer segment connection stress recorder (7) at aperture, benefit
It is pressed into hydraulic oil in oil pressure pipe with hand-driven oil hydraulic pump, until stopping suppressing when oil pressure pressure is 4~4.5MPa, completes stress and passes
Sensor (6) installation；It is inserted into Grouting Pipe (8) and slurry recovering tube (9), blocks aperture using AB glue, implementation injection hole sealing, when slip casting fills
Entire drilling；
D. the stress variation that 15 days are monitored before pressure break, analyzes 15 days internal stress changing rules, determines that the preceding coal seam internal stress of pressure break becomes
Change range [σmin,σmax], which is set as stress stability section A；
E. implement hydraulic fracturing, while carrying out stress monitoring, continue to stress monitoring 5 days after the completion of pressure break, acquire pressure break mistake
Journey and post-fracturing stress data, analyze its changing rule, determine fracturing process and post-fracturing stress range [σ1,σ2],
The range is set as to the stress disturbance constant interval B of pressure break generation；
F. according to each drilling hole stress constant interval A, B obtained by step d and step e, impacted stress monitoring point is determined；
IfThen the stress monitoring point is not influenced by hydraulic fracturing；
IfThen the stress monitoring point is influenced by hydraulic fracturing；
G. it delimit coverage: point is influenced according to the determined hydraulic fracturing of step f, find out b3 difference of step respectively radially most
Remote to influence point, connecting these three to put drawn a circle to approve range with straight line is to wear the effective coverage of layer hydraulic fracturing (10).
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| 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 |
| CN110259442B (en) * | 2019-06-28 | 2022-10-21 | 重庆大学 | Coal measure stratum hydraulic fracturing fracture horizon identification method |
| 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 |
| CN111173487B (en) * | 2019-12-25 | 2022-02-08 | 天地科技股份有限公司 | Monitoring method for regional hydraulic fracturing |
| 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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| CN102182437B (en) * | 2011-04-19 | 2013-09-25 | 河南理工大学 | Method for determining and eliminating hydraulic fracture stress boundary of coal mine underground drilling |
| 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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