Hard roof orientation acidification fracturing roof control pressure relief method

A technology of acid fracturing and hard roof, which is applied in earth square drilling, ground mining, underground mining, etc. It can solve the problems of high gas mine safety hazards, waste of coal resources, etc., to increase the stability of coal pillars, reduce the number of renovations, Obvious effect

Inactive Publication Date: 2018-11-27
中铁十九局集团矿业投资有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, the method of passively strengthening the support and increasing the width of the roadway coal pillar is often used to ensure the stability of the roadway surrounding rock with a hard roof, or through active forced blasting, water injection weakening and underground hydraulic fracturing. method to control the collapse of the hard roof, but the method of strengthening the support and increasing the width of the coal pillar in the roadway cannot fundamentally solve the occurrence of dynamic disasters, and also wastes a lot of coal resources; There are certain safety hazards in high-gas mines. The water injection softening of the hard roof mainly stays at the level of water absorption and moisture softening. It is often used as an auxiliary means of forced blasting and caving. Underground hydraulic fracturing

Method used

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  • Hard roof orientation acidification fracturing roof control pressure relief method
  • Hard roof orientation acidification fracturing roof control pressure relief method
  • Hard roof orientation acidification fracturing roof control pressure relief method

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Experimental program
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Effect test

Embodiment 1

[0057] Such as Figure 1-Figure 3 Shown, the present embodiment coal seam 10 thickness M is 18m, specifically comprises the following steps:

[0058] Step 1: Determine the fracturing target layer 1:

[0059] On the premise of grasping the hard roof layer overlying the coal seam and the properties of interlayer rock strata, according to the key layer theory, a reasonable fracturing target layer 1 is obtained;

[0060] Step 2: Arranging the acidizing fracturing roadway 3:

[0061] The coal seam 10 is an extra-thick coal seam, so before the working face is recovered, the acidizing fracturing roadway 3 is constructed along the roof of the coal seam 10 in the coal pillar 8, and the horizontal offset S between the acidizing fracturing roadway and the recovery roadway is 9m;

[0062] Step 3: Arranging fracturing holes 4, guide holes 5 and wedge grooves 6:

[0063] In the fracturing target layer 1 above the acidizing fracturing roadway 3, fracturing holes 4 and guide holes 5 are a...

Embodiment 2

[0067] Such as Figure 4-Figure 5 Shown, the present embodiment coal seam thickness M is 6.5m, specifically comprises the following steps:

[0068] Step 1: Determine the fracturing target layer 1:

[0069] On the premise of grasping the hard roof layer overlying the coal seam and the properties of interlayer rock strata, according to the key layer theory, a reasonable fracturing target layer 1 is obtained;

[0070] Step 2: Arranging the acidizing fracturing roadway 3:

[0071] The coal seam 10 is a thick coal seam, and the mining roadway 9 is used as the acidizing and fracturing roadway 3;

[0072] Step 3: Arranging fracturing holes 4, guide holes 5 and wedge grooves 6:

[0073] In the coal seam 10 above the entire acidizing fracturing roadway 3 and the roof rock layer 8, there are longitudinally arranged fracturing holes 4 and guide holes 5 at a certain angle with the coal seam inclination, and the guide holes 5 are arranged between adjacent fracturing holes 4. Middle pos...

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Abstract

The invention discloses a hard roof orientation acidification fracturing roof control pressure relief method which includes the steps: determining a fracturing target layer, particularly determining afracturing hard difficult caving roof layer position, and acquiring the reasonable fracturing target layer according to the hard difficult caving roof layer position and natures of rock layers; arranging an acidification fracturing roadway; arranging a fracturing hole, a guide hole and a wedge-shaped groove; connecting acidification fracturing systems, and performing acidification fracturing. According to the method, acidification fracturing of a hard roof is controlled, the strength of a rock is weakened, mechanical properties of the rock are reduced, the integrity of the hard roof is destroyed, local stress concentration is effectively removed, and goaf roofs can be timely collapsed in a layered and batched manner. The method avoids a series of mine dynamic disasters which include thatstrong mine pressure of a high stress area of a coal column and strong mine pressure along a caving roadway are appeared as large-area hard roofs of working areas cannot be timely collapsed. The method is obvious in effect and has wide practicability.

Description

technical field [0001] The invention relates to the technical field of acid fracturing pressure relief, in particular to a pressure relief method for directional acid fracturing of a hard roof to control the roof. Background technique [0002] The coal seam is hard and difficult to collapse. The joints of the roof rock mass are strong, the cracks are not developed, and the thickness of the layer is large. As the working face advances, the hard roof will form a cantilever beam of a certain length with the coal pillars in the goaf as the support point. It is not easy to fall or fall behind and cannot fill the gob. Due to the characteristics of the hard roof that is not easy to fall, especially in the mining of deep extra-thick coal seams and thick coal seams, it is easily affected by the effect of "three highs and one disturbance". With the periodic pressure of the working face, the hard roof will fall behind at a certain angle to the goaf and the coal seam, the concentrated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 赵鑫王挥云张梅王博潘瑞
Owner 中铁十九局集团矿业投资有限公司
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