CN107676126A - It is a kind of to utilize the concordant region hydraulic fracturing method for intercepting control - Google Patents
It is a kind of to utilize the concordant region hydraulic fracturing method for intercepting control Download PDFInfo
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- CN107676126A CN107676126A CN201710962814.7A CN201710962814A CN107676126A CN 107676126 A CN107676126 A CN 107676126A CN 201710962814 A CN201710962814 A CN 201710962814A CN 107676126 A CN107676126 A CN 107676126A
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- pressure break
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- hydraulic fracturing
- fracturing
- coal seam
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003245 coal Substances 0.000 claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 238000007796 conventional method Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims abstract description 3
- 239000004568 cement Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000003325 tomography Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000007569 slipcasting Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of using the concordant region hydraulic fracturing method for intercepting control, this method is mainly for hardness is low, the high coal seam low with gas permeability of gas bearing capacity.Coal seam crustal stress, geological information, fractured situation are tested using conventional method first, according to test result, centered on pressure break hole, fracture zone is divided into four parts, utilizes inspection hole and microseism technical monitoring crack developing direction.When fracturing fluid occurs in some inspection hole on pressure break direction or micro seismic monitoring then suspends fracturing work to signal, intercept hole apart from the construction of pressure break hole 30cm position this side up and blocked, after to be solidified, continue fracturing work, until four parts are all by pressure break.The present invention solves the problem that bearing of trend detection in crack is not clear in hydraulic fracturing process, reliable results, can realize subterranean zone pressure break and anti-reflection target.
Description
Technical field
The present invention relates to a kind of construction technology using the concordant region hydraulic fracturing method for intercepting control, suitable for colliery
Down-hole coal bed concordant hydraulic fracturing anti-reflection work.
Background technology
Coal in China hosting geological condition is complicated, and coal seam has that hardness is low, the high spy such as low with gas permeability of gas bearing capacity mostly
Point, it is the key technology for improving gas pumping effect that coal seam is anti-reflection, and it is the anti-reflection technology in coal seam the most frequently used at present that water, which controls gas,.Closely
Nian Lai, many coal enterprise have carried out the experiment that a variety of water control gas, achieve preferable achievement, and wherein hydraulic fracturing technology increases
The saturating the most notable but current hydraulic fracturing technology of effect is remained in problems with：Downhole hydraulic pressure break is local pressure break mostly,
It can not be pressed completely for fracture zone；Crack bearing of trend during hydraulic fracturing can not be determined.For current waterpower pressure
The problem of technology of splitting is present, it is badly in need of further in-depth research, innovates fracturing technology, establish and improve pressure break coverage and investigate judge
Method, the complete pressure break of fracture zone is realized, while the coverage of the anti-reflection extracting result later of pressure break is further examined
Examine, really improve pressure break system.
The content of the invention
For deficiencies of the prior art, the concordant region waterpower for intercepting control is utilized the invention provides a kind of
Fracturing process, this method can realize the complete pressure break of fracture zone, working procedure letter in hydraulic fracturing process because of it at the scene
It is single, it can effectively increase the extraction efficiency of coal-bed gas, largely reduce the protrusion accident of coal and gas in coal seam, fit
Preferably promoted the use of in colliery.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
It is a kind of to be comprised the following steps using the concordant region hydraulic fracturing method for intercepting control, this method：
A. coal seam crustal stress, geological information, fractured situation are tested using conventional method；
B. ceasma is suppressed in selected pressure break coal seam, and high pressure resistant sealing of hole is carried out using conventional method；
C. centered on pressure break hole, according to fracture zone geological information, fractured situation, the complete situation of roof and floor and
The principle of " crack extends perpendicular to minimum principal stress direction ", the order preferentially extended according to crack divide fracture zone, successively
For tetra- △ OAB, △ OBC, △ OCD, △ ODA regions；
D. constructing check drills at pressure break hole or so 20m and roof and floor；
E. fracturing work is carried out to pressure break hole, in fracturing process, utilizes the developmental state in microseism technical monitoring crack；
F. there is the rear pause fracturing work of one of situations below, determine pressure break direction：When fracturing fluid occurs in some inspection hole；
Micro seismic monitoring can judge that pressure break crack has been extended in △ OAB, △ OBC, △ OCD, △ ODA to obvious extension signal
One region；
G. it is determined that pressure break direction in, hole and carried out constructing 2~3 once to intercept apart from pressure break hole 30cm position
Closure；
H. after intercepting the solidification of hole plugging material, fracturing work is continued, and pressure break direction is determined with step e；
I. repeat step e, f, g, h, until tetra- △ OAB, △ OBC, △ OCD, △ ODA regions are terminated all by pressure break
Fracturing work.
As a preferred embodiment of the present invention, described fracture zone, zone boundary should be met apart from Seam Roof And Floor
For the 1/5 of coal seam thickness.
As another preferred scheme of the present invention, described crack preferentially extends, and should at least meet one of following condition：
Soft layering be present in pressure break coal seam；There is tomography in fracture zone；Perpendicular to minimum principal stress；Top plate integrity degree is bad；Bottom plate is complete
Spend bad.
As another preferred scheme of the present invention, inclination angle, azimuth and the pressure break hole of described check borehole keep one
Cause, the 2/3 of aperture pressure ceasma, hole depth exceedes pressure break hole 5m, and sealed borehole length and extraction borehole are suitable.
As a modification of the present invention scheme, inclination angle, azimuth and the pressure break hole in described interception hole are consistent, hole
The 2/3 of footpath pressure ceasma, hole depth exceed pressure break hole 5m, and complete opening uses cement grout non-stop plugging.
As another improvement project of the present invention, described On Microseismic Monitoring Technique can use the quick measure coal seam of test aqueous
The method of rate replaces.
Compared with prior art, the present invention has the following technical effect that：
1st, the present invention is surveyed before pressure break using conventional method to coal seam crustal stress, geological information, fractured situation
Examination, selected pressure break coal seam suppress ceasma, in fracturing process, using the developmental state in microseism technical monitoring crack, determine crack
Bearing of trend, it is determined that pressure break direction in, apart from pressure break hole 30cm position construct 2~3 once intercept hole go forward side by side
Row closure, can effectively control pressure break scope, so that it is guaranteed that the effect of pressure break.
2nd, this method because fracturing effect it is notable, quickness and high efficiency, can effectively to coal seam carry out hydraulic fracturing, ensure
Being normally carried out of extraction coal-bed gas, suitably promotes the use of in colliery.
Brief description of the drawings
Fig. 1 is to utilize the concordant region hydraulic fracturing method schematic diagram for intercepting control；
Fig. 2 is to utilize the concordant region hydraulic fracturing method a-a profiles for intercepting control；
Fig. 3 is to utilize the concordant region hydraulic fracturing method b-b profiles for intercepting control.
In accompanying drawing：1-pressure break coal seam；2-fracture zone；3-pressure break hole；4-intercept hole；5-inspection hole；6-coal seam
Top plate；7-seat earth；L-fracture zone border and the distance of Seam Roof And Floor；ABCD-fracture zone.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
As Figure 1-3, it is a kind of using the concordant region hydraulic fracturing method for intercepting control, comprise the following steps：
1) using conventional method to coal seam crustal stress, tomography, porosity, permeability, moisture content, mechanical strength, top plate and
The parameter such as the mechanical strength of bottom plate and integrality is tested.
2) ceasma is suppressed in selected pressure break coal seam, after fracturing borehole is first constructed successfully with Φ 75mm drill bits, then uses Φ
The drill bit reaming of 94mm diameters is to pressure break roof 0.5m, it is ensured that pressure break pipe can deliver to design fractured layer position.
3) fracturing borehole aperture is blocked using towel (cotton yarn), and closure length is not less than 1m, can slip casting after AB glue solidification.
4) during the slip casting of pressure break hole, it is necessary to which, using cement mortar machinery sealing of hole, the ratio of cement and swelling agent presses 3.5：1, ash
The ratio of (including cement and swelling agent) and water presses 2.6:1 is mixed, slip casting to pressure break seat earth position.
5) centered on pressure break hole, according to fracture zone geological information, fractured situation, top plate and the complete situation of bottom plate
And the principle of " crack extends perpendicular to minimum principal stress direction ", the order preferentially extended according to crack divide four regions,
It is followed successively by tetra- △ OAB, △ OBC, △ OCD, △ ODA regions.
6) constructing check drills at pressure break hole or so 20m and roof and floor, inclination angle, azimuth and the pressure break hole of check borehole
It is consistent, the 2/3 of aperture pressure ceasma, hole depth exceedes pressure break hole 5m, simple sealing of hole.
7) fracturing work is carried out to pressure break hole, in fracturing process, utilizes the developmental state in microseism technical monitoring crack.
8) there is the rear pause fracturing work of one of situations below, and determine pressure break direction：When pressure break occurs in some inspection hole
Liquid；Micro seismic monitoring can judge that pressure break crack has been extended in △ OAB, △ OBC, △ OCD, △ ODA to obvious extension signal
A region.
9) it is determined that pressure break direction in, hole and carried out constructing 2~3 once to intercept apart from pressure break hole 30cm position
Closure, the inclination angle, azimuth and pressure break hole for intercepting hole are consistent, and the 2/3 of aperture pressure ceasma, hole depth exceedes pressure break hole 5m,
Complete opening is blocked using cement grout.
10) after intercepting the solidification of hole plugging material, fracturing work is continued, and pressure break direction is determined with step e.
11) repeat step 7), 8), 9), 10), until △ OAB, △ OBC, tetra- △ OCD, △ ODA regions are all pressed
Split, terminate fracturing work.
The construction technique of the concordant hydraulic fracturing method of interception control fracture zone mainly includes parameter testing (such as
Step 1)), selected pressure break coal seam and arrange drilling (such as step 2), step 3), step 4)), fracture zone numbering such as (step
5) inspection hole (such as step 6)), micro seismic monitoring (such as step 7))), are beaten, judges bearing of trend (step 8)), envelope intercept hole (step
9)), continue pressure break (such as step 10)), to ensure the unimpeded as found to block of pressure break hole in hydraulic fracturing process, should adopt in time
Measure is taken to dredge.
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 (6)
1. a kind of utilize the concordant region hydraulic fracturing method for intercepting control, it is characterised in that comprises the following steps：
A. coal seam crustal stress, geological information, fractured situation are tested using conventional method；
B. ceasma is suppressed in selected pressure break coal seam, and high pressure resistant sealing of hole is carried out using conventional method；
C. centered on pressure break hole, according to fracture zone geological information, fractured situation, the complete situation of roof and floor and " split
Gap extends perpendicular to minimum principal stress direction " principle, the order preferentially extended according to crack divides fracture zone, is followed successively by △
Tetra- OAB, △ OBC, △ OCD, △ ODA regions；
D. constructing check drills at pressure break hole or so 20m and roof and floor；
E. fracturing work is carried out to pressure break hole, in fracturing process, utilizes the developmental state in microseism technical monitoring crack；
F. there is the rear pause fracturing work of one of situations below, determine pressure break direction：When fracturing fluid occurs in some inspection hole；Microseism
Obvious extension signal is monitored, and one that pressure break crack has been extended in △ OAB, △ OBC, △ OCD, △ ODA can be judged
Region；
G. it is determined that pressure break direction in, hole and sealed constructing 2~3 once to intercept apart from pressure break hole 30cm position
It is stifled；
H. after intercepting the solidification of hole plugging material, fracturing work is continued, and pressure break direction is determined with step e；
I. repeat step e, f, g, h, until pressure break is terminated in tetra- △ OAB, △ OBC, △ OCD, △ ODA regions all by pressure break
Operation.
A kind of 2. concordant region hydraulic fracturing method controlled using intercepting according to claim 1, it is characterised in that institute
The fracture zone stated, zone boundary should be met apart from 1/5 that Seam Roof And Floor is coal seam thickness.
A kind of 3. concordant region hydraulic fracturing method controlled using intercepting according to claim 1, it is characterised in that institute
The crack stated preferentially extends, and should at least meet one of following condition：Soft layering be present in pressure break coal seam；There is tomography in fracture zone；
Perpendicular to minimum principal stress；Top plate integrity degree is bad；Bottom plate integrity degree is bad.
A kind of 4. concordant region hydraulic fracturing method controlled using intercepting according to claim 1, it is characterised in that inspection
The inclination angle, azimuth and pressure break hole for testing drilling are consistent, and the 2/3 of aperture pressure ceasma, hole depth exceedes pressure break hole 5m, sealing of hole length
Degree is suitable with extraction borehole.
A kind of 5. concordant region hydraulic fracturing method controlled using intercepting according to claim 1, it is characterised in that institute
Inclination angle, azimuth and the pressure break hole in the interception hole stated are consistent, and the 2/3 of aperture pressure ceasma, hole depth exceedes pressure break hole 5m, entirely
Hole uses cement grout non-stop plugging.
A kind of 6. concordant region hydraulic fracturing method controlled using intercepting according to claim 1, it is characterised in that institute
The On Microseismic Monitoring Technique stated can be replaced with the method for the quick measure coal seam moisture content of test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710962814.7A CN107676126B (en) | 2017-10-16 | 2017-10-16 | It is a kind of to utilize the concordant region hydraulic fracturing method for intercepting control |
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| CN201710962814.7A CN107676126B (en) | 2017-10-16 | 2017-10-16 | It is a kind of to utilize the concordant region hydraulic fracturing method for intercepting control |
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| CN107676126A true CN107676126A (en) | 2018-02-09 |
| CN107676126B CN107676126B (en) | 2019-01-29 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845373A (en) * | 2018-04-20 | 2018-11-20 | 大连理工大学 | It is classified the detection method of buck borehole fissure |
| CN108845101A (en) * | 2018-04-20 | 2018-11-20 | 大连理工大学 | It is classified buck borehole fissure detection system |
| CN109611143A (en) * | 2018-12-13 | 2019-04-12 | 煤炭科学技术研究院有限公司 | The multi-parameter integrated monitoring system of top plate hydrofracturing and fracturing effect method of discrimination |
| 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 |
| CN111784059A (en) * | 2020-07-06 | 2020-10-16 | 贵州工程应用技术学院 | Method for predicting dominant development azimuth of coal seam macroscopic crack |
| CN113153280A (en) * | 2020-10-22 | 2021-07-23 | 煤炭科学研究总院 | Underground coal seam hydraulic fracturing drilling pressure relief and permeability increase effect detection system and method |
| CN113187551A (en) * | 2021-04-16 | 2021-07-30 | 北京科技大学 | Method for preventing and treating dynamic disasters by long-drill-hole subsection fixed-point controlled fracturing |
| CN114251080A (en) * | 2021-12-28 | 2022-03-29 | 中国矿业大学 | Controllable detonation pressure uniform pressure relief permeability increasing method and system |
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| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
| US20140262291A1 (en) * | 2013-03-15 | 2014-09-18 | Schlumberger Technology Corporation | System and method for complex fracture generation |
| CN106014473A (en) * | 2016-02-03 | 2016-10-12 | 中国矿业大学(北京) | Cross drilling constrained expansion network anti-reflection gas drainage method |
| CN106150540A (en) * | 2016-07-01 | 2016-11-23 | 重庆市能源投资集团科技有限责任公司 | The anti-gas pumping method that transfinites in the tunnel of a kind of progressively blood pressure lowering |
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2017
- 2017-10-16 CN CN201710962814.7A patent/CN107676126B/en not_active Expired - Fee Related
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| CN102022134A (en) * | 2010-11-16 | 2011-04-20 | 郑州大学 | Drilling, pressing and vibrating combined pressure-relieving coal bed gas exploitation method |
| US20140262291A1 (en) * | 2013-03-15 | 2014-09-18 | Schlumberger Technology Corporation | System and method for complex fracture generation |
| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845373A (en) * | 2018-04-20 | 2018-11-20 | 大连理工大学 | It is classified the detection method of buck borehole fissure |
| CN108845101A (en) * | 2018-04-20 | 2018-11-20 | 大连理工大学 | It is classified buck borehole fissure detection system |
| CN108845373B (en) * | 2018-04-20 | 2019-08-30 | 大连理工大学 | It is classified the detection method of buck borehole fissure |
| CN108845101B (en) * | 2018-04-20 | 2019-11-05 | 大连理工大学 | It is classified buck borehole fissure detection system |
| CN109611143A (en) * | 2018-12-13 | 2019-04-12 | 煤炭科学技术研究院有限公司 | The multi-parameter integrated monitoring system of top plate hydrofracturing and fracturing effect method of discrimination |
| 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 |
| CN111784059A (en) * | 2020-07-06 | 2020-10-16 | 贵州工程应用技术学院 | Method for predicting dominant development azimuth of coal seam macroscopic crack |
| CN111784059B (en) * | 2020-07-06 | 2022-04-29 | 贵州工程应用技术学院 | Method for predicting dominant development azimuth of coal seam macroscopic crack |
| CN113153280A (en) * | 2020-10-22 | 2021-07-23 | 煤炭科学研究总院 | Underground coal seam hydraulic fracturing drilling pressure relief and permeability increase effect detection system and method |
| CN113153280B (en) * | 2020-10-22 | 2023-06-20 | 煤炭科学研究总院 | Underground coal seam hydraulic fracturing drilling pressure relief and permeability improvement effect detection system and method |
| CN113187551A (en) * | 2021-04-16 | 2021-07-30 | 北京科技大学 | Method for preventing and treating dynamic disasters by long-drill-hole subsection fixed-point controlled fracturing |
| CN114251080A (en) * | 2021-12-28 | 2022-03-29 | 中国矿业大学 | Controllable detonation pressure uniform pressure relief permeability increasing method and system |
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| CN107676126B (en) | 2019-01-29 |
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