CN107676126B - 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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- CN107676126B CN107676126B CN201710962814.7A CN201710962814A CN107676126B CN 107676126 B CN107676126 B CN 107676126B CN 201710962814 A CN201710962814 A CN 201710962814A CN 107676126 B CN107676126 B CN 107676126B
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- pressure break
- hole
- hydraulic fracturing
- fracturing
- coal seam
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003245 coal Substances 0.000 claims abstract description 31
- 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
- 238000010276 construction Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 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
- 230000035699 permeability Effects 0.000 abstract description 3
- 230000003667 anti-reflective effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000007569 slipcasting Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 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
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001737 promoting effect 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
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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of using the concordant region hydraulic fracturing method for intercepting control, and this method is low mainly for hardness, 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 some inspection hole fracturing fluid or micro seismic monitoring occurs and then suspends fracturing work to signal on pressure break direction, hole is intercepted in the position construction that this side up apart from pressure break hole 30cm and is blocked, after to be solidified, continues fracturing work, until four parts are all by pressure break.The present invention solves the problems, such as that crack extending direction detects unknown in hydraulic fracturing process, as a result reliably, can be realized subterranean zone pressure break and antireflective target.
Description
Technical field
The present invention relates to a kind of construction technologies using the concordant region hydraulic fracturing method for intercepting control, are suitable for coal mine
Down-hole coal bed concordant hydraulic fracturing anti-reflection work.
Background technique
Coal in China hosting geological condition is complicated, and coal seam has that hardness is low, gas bearing capacity is high low with gas permeability etc. special 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 most common coal seam that water, which controls gas,.Closely
Nian Lai, many coal enterprise have carried out the test that a variety of water control gas, achieve preferable achievement, and wherein hydraulic fracturing technology increases
The saturating the most significant but current hydraulic fracturing technology of effect still has following problems: downhole hydraulic pressure break is local pressure break mostly,
Fracture zone cannot be pressed completely；It can not determine crack extending direction during hydraulic fracturing.For current waterpower pressure
Split technology there are the problem of, be badly in need of further in-depth research, innovate fracturing technology, establish and improve pressure break coverage investigate judge
Method is realized the complete pressure break of fracture zone, while further being examined the coverage of the anti-reflection extracting result later of pressure break
It examines, really improves pressure break system.
Summary of the invention
In view of the above shortcomings of the prior art, the concordant region waterpower for intercepting control is utilized the present 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 coal mine.
In order to solve the above-mentioned technical problem, present invention employs following technical solutions:
A kind of concordant region hydraulic fracturing method using interception control, this method 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
The principle of " crack extends perpendicular to minimum principal stress direction " divides fracture zone according to the sequence that crack preferentially extends, successively
For △ OAB, △ OBC, △ OCD, tetra- regions △ ODA；
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 and utilizes the developmental state in microseism technical monitoring crack in fracturing process；
F. there is the rear pause fracturing work of one of following situations, determine pressure break direction: when fracturing fluid occurs in some inspection hole；
Micro seismic monitoring to apparent extension signal, and can judge pressure break crack be extended to △ OAB, △ OBC, △ OCD, in △ ODA
One region；
G. it in determining pressure break direction, in the primary interception holes of position construction 2~3 apart from pressure break hole 30cm and carries out
It blocks；
H. after intercepting the solidification of hole plugging material, continue fracturing work, and pressure break direction is determined with step e；
I. step e, f, g, h are repeated, until △ OAB, △ OBC, △ OCD, tetra- regions △ ODA terminate all by pressure break
Fracturing work.
As a preferred solution of the present invention, the fracture zone should meet zone boundary apart from Seam Roof And Floor
It is the 1/5 of coal seam thickness.
As another preferred embodiment of the invention, the crack preferentially extends, and should at least meet one of the following conditions:
There are soft layerings 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
It spends bad.
As another preferred embodiment of the invention, inclination angle, azimuth and the pressure break hole of the check borehole keep one
It causes, the 2/3 of aperture pressure ceasma, hole depth is more than pressure break hole 5m, and sealed borehole length and extraction borehole are suitable.
As an improvement of the present invention, inclination angle, azimuth and the pressure break hole in the interception hole are consistent, hole
The 2/3 of diameter pressure ceasma, hole depth are more than pressure break hole 5m, and complete opening uses cement grout non-stop plugging.
As another improvement project of the invention, the On Microseismic Monitoring Technique can quickly measurement coal seam be aqueous with test
The method of rate replaces.
Compared with prior art, the present invention has the following technical effect that
1, the present invention surveys coal seam crustal stress, geological information, fractured situation using conventional method before pressure break
Examination, selected pressure break coal seam suppress ceasma, in fracturing process, using the developmental state in microseism technical monitoring crack, determine crack
Extending direction go forward side by side in determining pressure break direction in 2~3 primary holes that intercept of constructing of the position apart from pressure break hole 30cm
Row blocks, and pressure break range can be effectively controlled, so that it is guaranteed that the effect of pressure break.
2, this method because fracturing effect it is significant, quickly and efficiently, can effectively to coal seam carry out hydraulic fracturing, guarantee
Being normally carried out of extraction coal-bed gas is suitable for promoting the use of in coal mine.
Detailed description of the invention
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 sectional view for intercepting control；
Fig. 3 is to utilize the concordant region hydraulic fracturing method b-b sectional view for intercepting control.
In attached drawing: 1-pressure break coal seam；2-fracture zones；3-pressure break holes；4-intercept hole；5-inspection holes；6-coal seams
Top plate；7-seat earths；L-fracture zone boundary is at a distance from Seam Roof And Floor；ABCD-fracture zone.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1-3, a kind of utilize the concordant region hydraulic fracturing method for intercepting control, comprising the following steps:
1) using conventional method to coal seam crustal stress, tomography, porosity, permeability, moisture content, mechanical strength, top plate and
The parameters such as the mechanical strength of bottom plate and integrality are tested.
2) ceasma is suppressed in selected pressure break coal seam, after fracturing borehole first uses Φ 75mm drill bit to construct successfully, then uses Φ
The drill bit reaming of 94mm diameter is to pressure break roof 0.5m, it is ensured that pressure break pipe can be sent to design fractured layer position.
3) fracturing borehole aperture is blocked using towel (cotton yarn), is blocked length and is not less than 1m, can slip casting after AB glue solidification.
4) when 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
(including cement and swelling agent) is mixed with the ratio of water by 2.6:1, 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 ", four regions are divided according to the sequence that crack preferentially extends,
It is followed successively by △ OAB, △ OBC, △ OCD, tetra- regions △ ODA.
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 is more than pressure break hole 5m, simple sealing of hole.
7) fracturing work is carried out to pressure break hole and utilizes the developmental state in microseism technical monitoring crack in fracturing process.
8) there is the rear pause fracturing work of one of following situations, and determine pressure break direction: when pressure break occurs in some inspection hole
Liquid；Micro seismic monitoring to apparent extension signal, and can judge pressure break crack be extended to △ OAB, △ OBC, △ OCD, in △ ODA
A region.
9) it in determining pressure break direction, in the primary interception holes of position construction 2~3 apart from pressure break hole 30cm and carries out
It blocking, the inclination angle, azimuth and pressure break hole for intercepting hole are consistent, and the 2/3 of aperture pressure ceasma, hole depth is more than pressure break hole 5m,
Complete opening is blocked using cement grout.
10) after intercepting the solidification of hole plugging material, continue fracturing work, and pressure break direction is determined with step e.
11) step 7), 8), 9), 10) is repeated, until △ OAB, △ OBC, △ OCD, tetra- regions △ ODA are all pressed
It splits, terminates fracturing work.
The interception control fracture zone concordant hydraulic fracturing method construction technique mainly include parameter testing (such as
Step 1)), selected pressure break coal seam and arrange drilling (such as step 2), step 3), step 4)), fracture zone number such as (step
5)), beat inspection hole (such as step 6)), micro seismic monitoring (such as step 7)), determine extending direction (step 8)), envelope intercept hole (step
9)), continue pressure break (such as step 10)), to guarantee the unimpeded as found blocking of pressure break hole in hydraulic fracturing process, should adopt in time
Measure is taken to dredge.
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 (6)
1. a kind of utilize the concordant region hydraulic fracturing method for intercepting control, which comprises the following steps:
A. coal seam crustal stress, geological information 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, the complete situation of roof and floor and " crack is main perpendicular to minimum
The principle of stress direction extension " divides fracture zone according to the sequence that crack preferentially extends, is followed successively by △ OAB, △ OBC, △
OCD, tetra- regions △ ODA；
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 and utilizes the developmental state in microseism technical monitoring crack in fracturing process；
F. there is the rear pause fracturing work of one of following situations, determine pressure break direction: when fracturing fluid occurs in some inspection hole；Microseism
It monitors apparent extension signal, and can judge that pressure break crack has been extended to △ OAB, △ OBC, △ OCD, one in △ ODA
Region；
G. it in determining pressure break direction, in the primary interception holes of position construction 2~3 apart from pressure break hole 30cm and is sealed
It is stifled；
H. after intercepting the solidification of hole plugging material, continue fracturing work, and pressure break direction is determined with step e；
I. step e, f, g, h are repeated, until △ OAB, △ OBC, △ OCD, tetra- regions △ ODA terminate pressure break all by pressure break
Operation.
2. a kind of concordant region hydraulic fracturing method using interception control according to claim 1, which is characterized in that institute
The fracture zone stated should meet zone boundary apart from 1/5 that Seam Roof And Floor is coal seam thickness.
3. a kind of concordant region hydraulic fracturing method using interception control according to claim 1, which is characterized in that institute
The crack stated preferentially extends, and should at least meet one of the following conditions: there are soft layerings 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.
4. a kind of concordant region hydraulic fracturing method using interception control according to claim 1, which is characterized 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 is more than pressure break hole 5m, and sealing of hole is long
It spends suitable with extraction borehole.
5. a kind of concordant region hydraulic fracturing method using interception control according to claim 1, which is characterized 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 is more than pressure break hole 5m, entirely
Hole uses cement grout non-stop plugging.
6. a kind of concordant region hydraulic fracturing method using interception control according to claim 1, which is characterized in that institute
The method that the On Microseismic Monitoring Technique stated can quickly measure coal seam moisture content with test replaces.
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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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| 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 CN107676126A (en) | 2018-02-09 |
| CN107676126B true CN107676126B (en) | 2019-01-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108845101B (en) * | 2018-04-20 | 2019-11-05 | 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 |
| CN109611143B (en) * | 2018-12-13 | 2022-05-10 | 煤炭科学技术研究院有限公司 | Roof hydraulic fracturing multi-parameter comprehensive monitoring system and fracturing effect judging method |
| CN110259442B (en) * | 2019-06-28 | 2022-10-21 | 重庆大学 | Coal measure stratum hydraulic fracturing fracture horizon identification method |
| 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 |
| 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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| CN102022134B (en) * | 2010-11-16 | 2012-11-07 | 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 |
| CN103362538B (en) * | 2013-07-15 | 2015-04-22 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
| CN106014473B (en) * | 2016-02-03 | 2018-01-09 | 中国矿业大学(北京) | A kind of cross borehole constrained expansion explosion network permeability-increasing gas drainage method |
| CN106150540B (en) * | 2016-07-01 | 2018-05-22 | 重庆市能源投资集团科技有限责任公司 | Prevent the gas pumping method that transfinites in a kind of tunnel being progressively depressured |
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