CN109826629A - A kind of coal mine ground pressure break tight roof technique choosing method - Google Patents
A kind of coal mine ground pressure break tight roof technique choosing method Download PDFInfo
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- CN109826629A CN109826629A CN201910061538.6A CN201910061538A CN109826629A CN 109826629 A CN109826629 A CN 109826629A CN 201910061538 A CN201910061538 A CN 201910061538A CN 109826629 A CN109826629 A CN 109826629A
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Abstract
Fracturing technology choosing method when the present invention relates to using ground fracturing technology to tight roof progress pressure break, specially a kind of coal mine ground pressure break tight roof technique choosing method solve to lack the method that coal mine tight roof ground fracturing technique is chosen at present.Step are as follows: one, mark pressure break destination layer three-dimensional stress；Two, orientation and working face mining direction are arranged according to horizontal well, marks two different horizontal well arrangements；Three, mini-frac destination layer three-dimensional stress distribution；Four, reasonable pressure break mode is determined in conjunction with fractured well itself arrangement of features according to three-dimensional stress distribution；Five, it is chosen according to fractured well as a result, carrying out pressure break in ground configuration fractured well.This method comprehensively, reliable, strong flexibility, be with a wide range of applications.
Description
Technical field
The invention belongs to the methods of ground fracturing to carry out fracturing control, specifically a kind of coal mine to tight roof is covered on coal seam
Ground fracturing tight roof technique choosing method.
Background technique
Coal bed underground exploitation, CONTROL OF STRATA MOVEMENT is core, and particularly with tight roof, because its intensity is big, breaking span is wide, hard
Resisting the fracture of plate large area stubbornly easily causes the strong mine pressure of stope to show, or even brings storm wind disaster, is a big difficulty of Roof Control.Mesh
The preceding control for tight roof, often in underground using control technologies means such as hydraulic fracturing or explosions, but by underground construction ring
The restriction of the execution conditions such as border and drillable length is generally only to implement to weaken to top plate in the tunnel of working face two sides, weakens model
It encloses and is confined to 50m above coal seam, control effect is limited.For this purpose, being directed to the limitation of current control technology, can innovate using ground
The method that face pressure is split is equipped by ground fracturing, beat fracturing borehole downwards from earth's surface and implement pressure break to top plate.According to fractured well
Method for arranging, ground fracturing tight roof can use vertical well, fractured horizontal well two ways, wherein use vertical well pressure
Split advantage of lower cost；When ground fracturing, fracturing fracture extends form and stratum three-dimensional stress is closely bound up, therefore, different
Under the conditions of fractured well arrangement, rock stratum difference three-dimensional stress, crack extension effect is different therewith, and fracturing effect is therewith by shadow
It rings.So suitable fractured well arrangement should be selected according to rock stress state, pressure break demand, utmostly meet to the greatest extent hard
It resists plate pressure break demand stubbornly, and reduces ground fracturing cost as far as possible.
Summary of the invention
Ground fracturing tight roof technique is chosen when the present invention is in order to solve the problem of tight roof mining area seam mining,
A kind of coal mine ground pressure break tight roof technique choosing method is provided.
The present invention takes following technical scheme: a kind of coal mine ground pressure break tight roof technique choosing method, including following
Step,
A. remember pressure break destination layer three-dimensional stress, being parallel to working face mining direction stress is σh, perpendicular to working face mining direction
Stress is σH, vertical direction stress is σv。
B. ground fracturing can use two kinds of pressure break modes of vertical well and horizontal well, and wherein fractured horizontal well includes two kinds again
Arrangement, note horizontal well horizontal segment be parallel to working face mining direction arrangement be fractured horizontal well mode 1., it is horizontal
Well horizontal segment perpendicular to working face mining direction arrangement be fractured horizontal well mode 2..
C. test analysis is carried out to pressure break destination layer three-dimensional stress state using detecting earth stress device；
Work as σH> σh> σvWhen, 1. pressure break is carried out using fractured horizontal well mode,
Work as σH> σv> σhWhen, 1. or 2. fractured horizontal well mode can carry out pressure break using vertical well or fractured horizontal well mode,
Compare three kinds of fractured well costs at this time, the pressure break mode for selecting cost low；
When there is σh> σH> σv、σh> σv> σH、σv> σH> σhAnd σv> σh> σHWhen several stress states, it is all made of level
2. well pressure break mode carries out pressure break.
D. it is chosen according to fractured well as a result, carrying out pressure break in ground configuration fractured well.
Compared with prior art, the invention has the following advantages that 1) cover the possible distribution of all three-dimensional stresses in rock stratum
State ensure that the comprehensive and reliability of choosing method；2) fully considered that arrangement and the technology of each fracturing process are special
Point chooses suitable pressure break mode according to different ambient stresses；3) the choosing method process is simple, need to only be opened according to working face
Adopt state, rock stratum three-dimensional stress distribution characteristics can determine that ground fracturing mode, strong applicability, application prospect is extensive.
Detailed description of the invention
Fig. 1 is ground fracturing well pressure break arrangement schematic diagram；
Fig. 2 is that ground fracturing tight roof technique chooses flow chart；
In figure: 1- working face, 2- pressure break destination layer, 3- horizontal segment are parallel to the fractured horizontal well mode in working face mining direction
1. 4- horizontal segment perpendicular to working face mining direction fractured horizontal well mode 2..
Specific embodiment
Below by taking the tight roof ground fracturing of Datong Mine Area as an example, in conjunction with attached drawing, the invention will be further described.
It is a kind of fractured well arrangement of coal mine ground pressure break tight roof technique choosing method of the present invention as shown in Figure 1
Schematic diagram, Fig. 2 are that specific fracturing technology chooses flow chart, according to pressure break destination layer three-dimensional stress state, are expanded in conjunction with hydraulic fracture
The suitable fracturing technology of Feature Selection is opened up, the specific steps are that.
A. according to 1 mining state of working face, remember 2 three-dimensional stress of pressure break destination layer, be parallel to 1 direction of extraction stress of working face
For σh, it is σ perpendicular to 1 direction of extraction stress of working faceH, vertical direction stress is σv。
B. it is fractured horizontal well mode 1. 3, water that note horizontal well horizontal segment, which is parallel to the arrangement of 1 direction of extraction of working face,
Horizontal well horizontal segment is fractured horizontal well mode 2. 4 perpendicular to the arrangement of 1 direction of extraction of working face；
C. test analysis is carried out to pressure break destination layer three-dimensional stress state using detecting earth stress device, the results showed that, pressure break mesh
Marking three-dimensional stress distribution in layer is σH> σh> σv。
D. according to Fig. 2,1. pressure break is carried out using fractured horizontal well mode.
E. it is chosen according to fractured well as a result, carrying out pressure break in ground configuration horizontal well.
Field monitoring the result shows that, the parallel maximum principal stress σ in crackHDirection, vertical minimum principal stress σvDirectional Extension,
Horizontal fracture face is formed in pressure break destination layer, reduces the thickness of tight roof；Ore pressure monitor shows after ground fracturing, hard
The mine pressure action intensity of hard Roof Breaking unstability is substantially reduced, and force piece resistance reduces by 15%, and roadway deformation amount reduces 45%,
Demonstrate the correctness of ground fracturing technique selection.The side chosen by using above-mentioned ground fracturing tight roof reasonable process
Method weakens the strong mine of stope and presses disaster, guarantee the safety and high efficiency in tight roof mining area coal seam for efficiently controlling tight roof
Have great importance.
Claims (1)
1. a kind of coal mine ground pressure break tight roof technique choosing method, it is characterised in that: include the following steps,
A. remember pressure break destination layer three-dimensional stress, being parallel to working face mining direction stress is σh, answered perpendicular to working face mining direction
Power is σH, vertical direction stress is σv；
B. ground fracturing can use two kinds of pressure break modes of vertical well and horizontal well, and wherein fractured horizontal well includes two kinds of arrangements again
Mode, note horizontal well horizontal segment be parallel to working face mining direction arrangement be fractured horizontal well mode 1., horizontal well water
Flat section perpendicular to working face mining direction arrangement be fractured horizontal well mode 2.；
C. test analysis is carried out to pressure break destination layer three-dimensional stress state using detecting earth stress device；
Work as σH> σh> σvWhen, 1. pressure break is carried out using fractured horizontal well mode,
Work as σH> σv> σhWhen, 1. or 2. fractured horizontal well mode can carry out pressure break using vertical well or fractured horizontal well mode,
Compare three kinds of fractured well costs at this time, the pressure break mode for selecting cost low；
When there is σh> σH> σv、σh> σv> σH、σv> σH> σhAnd σv> σh> σHWhen several stress states, it is all made of level
2. well pressure break mode carries out pressure break；
D. it is chosen according to fractured well as a result, carrying out pressure break in ground configuration fractured well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910061538.6A CN109826629B (en) | 2019-01-23 | 2019-01-23 | Coal mine ground fracturing hard roof process selection method |
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| CN201910061538.6A CN109826629B (en) | 2019-01-23 | 2019-01-23 | Coal mine ground fracturing hard roof process selection method |
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| CN109826629A true CN109826629A (en) | 2019-05-31 |
| CN109826629B CN109826629B (en) | 2020-09-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295880A (en) * | 2019-07-04 | 2019-10-01 | 中国矿业大学 | A kind of optimization of various dimensions hydraulic fracturing roof stops the method for adopting line |
| CN112160792A (en) * | 2020-08-31 | 2021-01-01 | 太原理工大学 | Staged hydraulic fracturing working method for underground hard top plate |
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| CN105952429A (en) * | 2016-05-17 | 2016-09-21 | 中国地质大学（武汉） | Terrestrial facies shale gas fracture network fracture parameter optimizing method |
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| CN112160792A (en) * | 2020-08-31 | 2021-01-01 | 太原理工大学 | Staged hydraulic fracturing working method for underground hard top plate |
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| CN109826629B (en) | 2020-09-18 |
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