CN103982137A - Design method for underground hydraulic fracturing drilled hole azimuth angle of coal mine - Google Patents
Design method for underground hydraulic fracturing drilled hole azimuth angle of coal mine Download PDFInfo
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- CN103982137A CN103982137A CN201410210972.3A CN201410210972A CN103982137A CN 103982137 A CN103982137 A CN 103982137A CN 201410210972 A CN201410210972 A CN 201410210972A CN 103982137 A CN103982137 A CN 103982137A
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Abstract
A design method for an underground hydraulic fracturing drilled hole azimuth angle of a coal mine comprises the steps that according to the existing coal bed geological data, determining the sizes of the vertical ground stress, the maximum horizontal ground stress and the minimal horizontal ground stress as well as the direction of the maximal horizontal ground stress of a coal bed in a mining area; if the vertical ground stress in the three ground stress is the largest, drilling performing vertical laneway side wall construction on a drilled hole; if the vertical ground stress is smaller than the maximal horizontal ground stress, determining the included angel alpha between the drilled hole and the laneway according to the included angle theta between the maximal horizontal ground stress and the laneway and finally determining the azimuth angle of the drilled hole by the included angel alpha and a laneway azimuth angle beta. A reasonable hydraulic fracturing drilled hole azimuth angle is designed by using the ground stress, the design blindness of hydraulic fracturing drilled hole parameters is avoided, a basis can be provided for the design of the hydraulic fracturing drilled hole azimuth angle, the designed drilled hole arrangement is favorable for the development and expansion of fractures among the hydraulic fracturing drilled hole holes, the breathability of the coal bed is increased, the influencing range of the hydraulic fracturing drilled hole is expanded and the gas extraction effect is improved.
Description
Technical field
The present invention relates to coal mine lower area gas control technology field, be specifically related to fracturing bore direction angle method for designing under a kind of coal mine.
Background technology
Along with the high-efficiency intensifying of coal in China production and the increase of mining depth, gas emission is increasing, and the threat of gas explosion and Gas Outburst danger is more and more serious.The major measure that solves the gas problem in seam mining process is to implement in advance coal bed gas extraction, and for high gassy and low permeability coal seam, the conventional effective influence basin of drilling gas pumping method is little, and extracting result is poor, need to take anti-reflection method.Hydraulic fracturing technology is the major measure of oil output, and the application under coal mine has also obtained certain effect.Utilize hydraulic fracturing technology to carry out release to coal body anti-reflection, increase boring influence basin, improve coal body gas permeability.
Along with the application under coal mine and popularization, hydraulic fracturing technology each side technique improves gradually.But, as the measure that improves hole pumping and mining effect, research for fracturing boring is relatively less, the design parameters of fracturing boring does not have unified specification as inclination angle, azimuth, hole depth etc., there is certain blindness in the selection of parameter, especially bore direction angle, large more options are perpendicular to the construction of lane side, and the effect that fracturing release is anti-reflection is restricted.Coal body is implemented when fracturing, and boring crack is around grown, expand under hydraulic pressure, and research shows, the direction of fracturing crack propagation extension is relevant with the suffered geostatic stress size and Orientation of coal body, and crack is always along vertically and the Directional Extension of minimum stress.And when fracturing the ideal orientation of crack propagation be boring with boring between the expansion of direction cranny development, and then link up and form fracture network, formation region release is anti-reflection.Under the size and Orientation prerequisite that takes into full account geostatic stress, by selecting suitable fracturing bore direction angle, make hydraulic fracturing technology in preset range and direction, the anti-reflection effect of release to reach best, improve gas pumping effect.
Summary of the invention
Technical problem: the object of the invention is for having problems in prior art, provide a kind of method simple, easy to operate, can effectively strengthen fracturing release antireflective effect, improve fracturing bore direction angle method for designing under the coal mine of gas pumping effect.
Technical scheme: fracturing bore direction angle method for designing under coal mine of the present invention, comprises the following steps:
A. according to coal geology information, determine boring vertically stress σ of coal seam, place
v, maximum horizontal geostatic stress σ
h, minimum level main stress bar σ
hsize, and definite tunnel azimuthal angle beta and maximum horizontal principal stress σ
hazimuth γ;
B. calculate maximum horizontal principal stress σ by the azimuth γ of tunnel azimuthal angle beta and major principal stress
hwith the angle theta in tunnel=| β-γ |, in the time of θ >90 °, θ is changed into acute angle;
C. determine the angle α in boring and tunnel;
If vertically stress σ
vbe greater than maximum horizontal geostatic stress σ
htime, angle α=90 ° in boring and tunnel;
If vertically stress σ
vbe less than maximum horizontal geostatic stress σ
htime,
As maximum horizontal principal stress σ
hdirection and angle theta≤45 in tunnel
°, the scope of the angle α in boring (3) and tunnel (4) is 90 °-θ≤α≤90 °+θ, directly at lane side construction drill;
In the time of 45 ° of < θ≤90 °, boring (3) is α≤90-θ with the scope of the angle α in tunnel (4), arranges drill site (5), construction drill in drill site (5);
D. final definite boring (3) azimuth is alpha+beta.
Beneficial effect: while the present invention is directed under coal mine hydraulic fracturing technology application, data of holes drilled design exists certain blindness, especially the selection at bore direction angle, the impact that the distribution that does not take into full account coal seam geostatic stress is extended fracturing crack propagation, has proposed a kind ofly can effectively to strengthen fracturing release antireflective effect, fracturing bore direction angle method for designing under the coal mine of gas pumping effect is provided.Utilize geostatic stress fracturing bore direction angle reasonable in design, avoided the blindness of fracturing data of holes drilled design, improve the science of fracturing drilling design.The impact that the fracturing boring of arranging by the present invention can utilize coal body geostatic stress size and Orientation to extend fracturing crack propagation, promotes crack in predetermined direction and scope expansion, forms the anti-reflection region of target release.By enforcement of the present invention, can expand the anti-reflection scope of fracturing release, increase coal body gas permeability, improve gas pumping effect.Its method is simple, and implementation result is good, has practicality widely.
Brief description of the drawings
Fig. 1 is that fracturing is holed while directly acting on lane side construction brill, azimuth design working drawing (θ≤45 °).
Fig. 2 is while drilling in fracturing boring drill site, azimuth design working drawing (45 ° of < θ≤90 °).
In figure: 1-maximum horizontal geostatic stress σ
h, 2-minimum level geostatic stress σ
h, 3-fracturing boring, 4-tunnel, 5-drill site.
Detailed description of the invention:
Below in conjunction with accompanying drawing, embodiments of the invention are further described:
Embodiment 1, as shown in Figure 1, to directly act on lane side construction drill as example.Under its coal mine, the step of fracturing boring method for arranging is as follows:
A. utilize test geostatic stress method to record fracturing boring vertically stress σ of work plane coal seam, (3) place
v, maximum horizontal geostatic stress σ
h(1), minimum level main stress bar σ
h(2) size;
B. in conjunction with coal geology data, calculate maximum horizontal principal stress σ by the azimuth γ of tunnel azimuthal angle beta and major principal stress
h(1) with the angle theta in tunnel (4)=| β-γ |, in the time of θ >90 °, by the method for geometry between angle, θ is changed into acute angle.For example angle theta=135 °, change into °-90 °=45 °, acute angle theta=135 by the geometrical relationship between angle, and θ=234 ° change into °-180 °=54 °, acute angle theta=234 by the geometrical relationship between angle for another example;
If c. stress σ vertically
vbe greater than maximum horizontal geostatic stress σ
h(1), because the fracturing boring expansion extension in crack around has certain randomness, when boring is helped perpendicular to lane, effective sealed borehole length of boring is the longest, so select boring perpendicular to roadway construction, i.e. fracturing boring (3) is 90 ° with tunnel (4) angle α;
If vertically stress σ
vbe less than maximum horizontal geostatic stress σ
h(1), determine the angle α in boring (3) and tunnel (4) according to the size of angle theta: when maximum horizontal geostatic stress and angle theta≤45 °, tunnel (4), adopt lane to help the method for directly drilling, boring (3) is 90-θ≤α≤90+ θ with the optional scope of tunnel (4) angle α;
D. according to boring (3) and the angle α in tunnel (4) and the azimuthal angle beta of tunnel (4), determine that boring (3) azimuth is alpha+beta.
Embodiment 2, as shown in Figure 2, taking at drill site construction drill as example.The step of its fracturing bore direction angle method for arranging is substantially the same manner as Example 1, and identical part slightly.Difference is:
In the time of maximum horizontal geostatic stress and 45 ° of < θ≤90 of tunnel angle °, boring (3) is α≤90-θ with the optional scope of tunnel (4) angle.
In example 1, boring (3) directly acts on the advantage of helping (4) to construct in lane and is not need the drill site of constructing, reduce engineering quantity, shortcoming is in the time that boring (3) and tunnel (4) angle are too small, the effective length of boring (3) sealing of hole can not be guaranteed, if sealed borehole length is inadequate, release is helped easily to leak in lane.Therefore,, in the time that boring (3) and tunnel (4) angle are too small, should be chosen in the construction of drilling in drill site (5).
Claims (1)
1. a fracturing bore direction angle method for designing under coal mine, is characterized in that comprising the following steps:
A. according to coal geology information, determine boring vertically stress σ of (3) coal seam, place
v, maximum horizontal geostatic stress σ
h(1), minimum level main stress bar σ
h(2) size, and definite tunnel azimuthal angle beta and maximum horizontal principal stress σ
h(1) azimuth γ;
B. calculate maximum horizontal principal stress σ by the azimuth γ of tunnel azimuthal angle beta and major principal stress
h(1) with the angle theta in tunnel (4)=| β-γ |, in the time of θ >90 °, θ is changed into acute angle;
C. determine the angle α in boring (3) and tunnel (4);
If vertically stress σ
vbe greater than maximum horizontal geostatic stress σ
h(1) time, angle α=90 ° in boring (3) and tunnel (4);
If vertically stress σ
vbe less than maximum horizontal geostatic stress σ
h(1) time,
When the direction of maximum horizontal principal stress σ H (1) and angle theta≤45 ° of tunnel (4), the scope of the angle α in boring (3) and tunnel (4) is 90 °-θ≤α≤90 °+θ, directly at lane side construction drill;
In the time of 45 ° of < θ≤90 °, boring (3) is α≤90-θ with the scope of the angle α in tunnel (4), arranges drill site (5), construction drill in drill site (5);
D. final definite boring (3) azimuth is alpha+beta.
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| CN201410210972.3A CN103982137B (en) | 2014-05-19 | 2014-05-19 | Design method for underground hydraulic fracturing drilled hole azimuth angle of coal mine |
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|---|---|---|---|
| CN201410210972.3A CN103982137B (en) | 2014-05-19 | 2014-05-19 | Design method for underground hydraulic fracturing drilled hole azimuth angle of coal mine |
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| CN103982137A true CN103982137A (en) | 2014-08-13 |
| CN103982137B CN103982137B (en) | 2017-01-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105888686A (en) * | 2016-05-17 | 2016-08-24 | 陕西正通煤业有限责任公司 | Pressure relief method capable of satisfying parallel operation of tunneling and pressure relieving |
| CN107905832A (en) * | 2017-11-06 | 2018-04-13 | 北京九尊能源技术股份有限公司 | The outburst elimination method of pump drainage is combined on a kind of nitrogen pressure break and ground with underground |
| CN108361011A (en) * | 2018-03-08 | 2018-08-03 | 河南理工大学 | The method for controlling Affected areas by mining from underworkings orientation hydraulic fracturing |
| WO2018176892A1 (en) * | 2017-03-31 | 2018-10-04 | 中国矿业大学 | Network integrated and coordinated control system and method for thin coal seam comprehensive mining and gas control |
| CN112554953A (en) * | 2020-12-18 | 2021-03-26 | 山东科技大学 | Method for judging impact risk of syncline shaft stope by window intervention method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105888686A (en) * | 2016-05-17 | 2016-08-24 | 陕西正通煤业有限责任公司 | Pressure relief method capable of satisfying parallel operation of tunneling and pressure relieving |
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| WO2018176892A1 (en) * | 2017-03-31 | 2018-10-04 | 中国矿业大学 | Network integrated and coordinated control system and method for thin coal seam comprehensive mining and gas control |
| CN107905832A (en) * | 2017-11-06 | 2018-04-13 | 北京九尊能源技术股份有限公司 | The outburst elimination method of pump drainage is combined on a kind of nitrogen pressure break and ground with underground |
| CN108361011A (en) * | 2018-03-08 | 2018-08-03 | 河南理工大学 | The method for controlling Affected areas by mining from underworkings orientation hydraulic fracturing |
| CN112554953A (en) * | 2020-12-18 | 2021-03-26 | 山东科技大学 | Method for judging impact risk of syncline shaft stope by window intervention method |
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Address after: 221116 Research Institute of China University of Mining and Technology,, Jiangsu Applicant after: China University of Mining & Technology Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant before: China University of Mining & Technology |
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