CN108361011A - The method for controlling Affected areas by mining from underworkings orientation hydraulic fracturing - Google Patents

The method for controlling Affected areas by mining from underworkings orientation hydraulic fracturing Download PDF

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Publication number
CN108361011A
CN108361011A CN201810191325.0A CN201810191325A CN108361011A CN 108361011 A CN108361011 A CN 108361011A CN 201810191325 A CN201810191325 A CN 201810191325A CN 108361011 A CN108361011 A CN 108361011A
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Prior art keywords
overlying rock
presplitting
mining
rock
hydraulic fracturing
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CN201810191325.0A
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CN108361011B (en
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冯占杰
郭文兵
谭毅
杨达明
徐飞亚
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Henan Polytechnic University
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Henan Polytechnic University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal

Abstract

The present invention relates to a kind of methods controlling Affected areas by mining from underworkings orientation hydraulic fracturing, include the following steps:1)Obtain working face geology mining condition and presplitting tunnel overlying rock geological state, analysis subsidence trough boundary;2)Bandwidth and control subsidence trough boundary are gone along with sb. to guard him in the earth's surface construction grade determination protected as needed;3)According to step 2)Control subsidence trough boundary determines presplitting height and the position of overlying rock;4)According to step 3)Hydraulic fracturing operations are implemented in the presplitting height of determining overlying rock and position to the top plate of overlying rock.The method of the present invention can reduce Affected areas by mining to eliminate Mining subsidence suffered by earth's surface construction, reach protection earth's surface construction purpose.

Description

The method for controlling Affected areas by mining from underworkings orientation hydraulic fracturing
Technical field
Present invention relates particularly to a kind of methods controlling Affected areas by mining from underworkings orientation hydraulic fracturing, belong to and adopt Mine technical method field.
Background technology
Coal is the main energy of today's society, and with the progress of the development and production technology of society, people are to the energy Demand is increasing.After coal is produced from underground, top covering layer loses support, original stress equilibrium inside rock mass State is destroyed, and the redistribution of rock mass internal stress is caused, and the rock mass around goaf is made to generate displacement, deformation until broken It is bad.After area reaches certain range when goaf, above goaf earth's surface is caused to generate mobile and deformation.The movement of earth's surface with The basis of deformation effect construction causes construction mobile and deformation occur, or even breakoff phenomenon occurs.
In the prior art, there is the method that land subsidence is controlled and mitigated by goaf filling.Goaf filling is to make Mined out region is filled up with peripheral material, this method needs to use a large amount of filler, and costly, practical application is less. And it is according to subsidence trough rim angle, delineation subsidence trough boundary mostly in actual production.This method can only be to adopting Dynamic coverage is estimated and is demarcated, and active control earth's surface Affected areas by mining is unable to, can not be to being in subsidence region Building play the role of actively protect.
Invention content
The method that hydraulic fracturing controls Affected areas by mining is oriented from underworkings the purpose of the present invention is to provide a kind of, Concrete scheme is:
A method of Affected areas by mining being controlled from underworkings orientation hydraulic fracturing, is included the following steps:
1)Working face geology mining condition and presplitting tunnel overlying rock geological state are obtained, subsidence trough boundary is analyzed, The working face geology mining condition and presplitting tunnel overlying rock geological state include overlying rock rock stratum layer position, rock stratum thickness Degree, rock strength and crustal stress;
2)Bandwidth and control subsidence trough boundary are gone along with sb. to guard him in the earth's surface construction grade determination protected as needed;
3)According to step 1)Working face geology mining condition and presplitting tunnel overlying rock geological state and step 2)Control ground What table moving basin boundary determined subsidence trough boundary moves horizontally distance S, determines presplitting height H=S* of overlying rock tan 0
4)According to step 3)The presplitting height H of determining overlying rock implements hydraulic fracturing operations to overlying rock.
Step 4)Described in hydraulic fracturing operations include the following steps:
41)Drilling parameter is determined according to presplitting height and overlying rock geological state;
42)According to step 41)Determining drilling parameter sequentially drills in presplitting back;
43)According to overlying rock geological state and drilling hole depth multiple groovings are obtained in drilling preset distance fluting;
44)In each grooving front and back position sealing of hole, high pressure water is injected to drilling, high pressure water, which acts at grooving, makes its both sides open It splits, forms through crack;It cuts crack and cuts off tunnel overlying rock, form larger plane of weakness inside rock stratum;
45)With working face extraction to presplitting tunnel region, the overlying rock integral strength of fracture weakens, and slides and is layered along plane of weakness It is orderly caving, subsidence trough is formed other than construction safety berm.
Further, step 41)In drilling parameter include bore position, drilling hole depth, the spacing of wells, bore angle.
In terms of hydraulic fracturing technology is applied to reduction rock mass strength, control Affected areas by mining by the present invention, i.e., by fixed Rock mass strength is weakened to hydraulic fracturing, forms through crack, the transmission that cut-out overlying strata are broken to working face extraction direction reaches control The purpose of Affected areas by mining processed.Hydraulic fracturing to the reduction major embodiment of rock mass both ways:First, passing through hydraulic fracture Crack initiation and extension are transformed the macro microscopical structure of rock mass, weaken the mechanical property of rock mass;Second is that by water to the physical chemistry of rock Effect, reduces the mechanical property of rock.The two collective effect weakens the mechanical property of rock mass, reduces the whole strong of overlying rock Degree makes the overlying rock of fracture be orderly caving along plane of weakness sliding layering.This method and device can be effectively increased on face roof The degree of crushing of rock stratum, increase is caving height, due to subsidence trough rim angle 0It is constant, to surface movement basin Ground boundary can be moved to goaf direction, realized reduction Affected areas by mining and adopted damage suffered by earth's surface construction to eliminate Evil protects earth's surface construction purpose.
Description of the drawings
Fig. 1 is the principle schematic present invention determine that presplitting height;
Fig. 2 is the arrangement schematic diagram that drills in the present invention;
Fig. 3 is the B-B sectional schematic diagrams in Fig. 2;
Fig. 4 is drilling arrangement sectional schematic diagram.
Specific implementation mode
Intend selecting certain 53041 lane of mine being test area.It is thick by obtaining overlying rock rock stratum layer position, rock stratum as shown in Fig. 1 ~ 4 Degree, rock strength and crustal stress, the point for removing heavy 10mm is subsidence trough boundary point A, determines subsidence trough boundary Angle 0.Further, it is brick wood, the mixed village residential house of brick according to construction, is by mining area building protection grade classificationGrade, It is 10m to go along with sb. to guard him bandwidth, and obtain subsidence trough boundary moves horizontally distance S, and the final presplitting for determining overlying rock is high Spend H.
Fracturing borehole takes the mode of single arrangement, and as shown in Fig. 1 ~ 4, the spacing of wells is calculated by water injection hole radius of wetted bulb R, It is determined as 10m to form through crack.Pre-splitting hole is arranged in away from top plate at 0.5 ~ 1m of coal column side, bore diameter 56 (75) mm, Elevation angles are 70 ~ 90 °.
Using KZ54 type slotting drills, the prefabrication transverse grooving in rock stratum, hydrofracturing hole uses retroversion formula Splitting Method, by Foot of hole is primary every 1.5 ~ 2m pressure breaks outward.
The overlying rock integral strength reduction layering of fracture zone fracture is orderly caving, in construction safety berm A ' with shape At subsidence trough.

Claims (3)

1. a kind of method controlling Affected areas by mining from underworkings orientation hydraulic fracturing, which is characterized in that including following step Suddenly:
1)Working face geology mining condition and presplitting tunnel overlying rock geological state are obtained, subsidence trough boundary is analyzed, The working face geology mining condition and presplitting tunnel overlying rock geological state include overlying rock rock stratum layer position, rock stratum thickness Degree, rock strength and crustal stress;
2)Bandwidth and control subsidence trough boundary are gone along with sb. to guard him in the earth's surface construction grade determination protected as needed;
3)According to step 1)Working face geology mining condition and presplitting tunnel overlying rock geological state and step 2)Control ground What table moving basin boundary determined subsidence trough boundary moves horizontally distance S, determines presplitting height H=S* of overlying rock tan 0
4)According to step 3)The presplitting height H of determining overlying rock implements hydraulic fracturing operations to overlying rock.
2. the method according to claim 1 for controlling Affected areas by mining from underworkings orientation hydraulic fracturing, feature It is, step 4)Described in hydraulic fracturing operations include the following steps:
41)Drilling parameter is determined according to presplitting height and overlying rock geological state;
42)According to step 41)Determining drilling parameter sequentially drills in presplitting back;
43)According to overlying rock geological state and drilling hole depth multiple groovings are obtained in drilling preset distance fluting;
44)In each grooving front and back position sealing of hole, high pressure water is injected to drilling, high pressure water, which acts at grooving, makes its both sides open It splits, forms through crack;It cuts crack and cuts off tunnel overlying rock, form multiple planes of weakness inside overlying rock;
45)With working face extraction to presplitting tunnel region, the overlying rock integral strength of fracture weakens, and slides and is layered along plane of weakness It is orderly caving, subsidence trough is formed other than construction safety berm.
3. the method according to claim 2 for controlling Affected areas by mining from underworkings orientation hydraulic fracturing, feature It is:Step 41)In drilling parameter include bore position, drilling hole depth, the spacing of wells, bore angle.
CN201810191325.0A 2018-03-08 2018-03-08 Method for controlling mining influence range from underground roadway directional hydraulic fracturing Active CN108361011B (en)

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CN201810191325.0A CN108361011B (en) 2018-03-08 2018-03-08 Method for controlling mining influence range from underground roadway directional hydraulic fracturing

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CN201810191325.0A CN108361011B (en) 2018-03-08 2018-03-08 Method for controlling mining influence range from underground roadway directional hydraulic fracturing

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CN108361011B CN108361011B (en) 2020-06-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109339786A (en) * 2018-08-22 2019-02-15 太原理工大学 A kind of prefabricated Fracture orientation hydraulic fracturing cracking method
CN110130897A (en) * 2019-06-13 2019-08-16 中国神华能源股份有限公司 Roof weakening solution danger method
CN110173247A (en) * 2019-05-19 2019-08-27 中铁十九局集团矿业投资有限公司 A kind of Roof Control fracturing process of soft broken top plate ore body back production

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109339786A (en) * 2018-08-22 2019-02-15 太原理工大学 A kind of prefabricated Fracture orientation hydraulic fracturing cracking method
CN109339786B (en) * 2018-08-22 2020-03-24 太原理工大学 Directional hydraulic fracturing and cracking method for prefabricated cracks
CN110173247A (en) * 2019-05-19 2019-08-27 中铁十九局集团矿业投资有限公司 A kind of Roof Control fracturing process of soft broken top plate ore body back production
CN110130897A (en) * 2019-06-13 2019-08-16 中国神华能源股份有限公司 Roof weakening solution danger method

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