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Hydraulic fracturing crossing hole pitchup hole sealing method of broken surrounding rock

A technology of hydraulic fracturing and drilling through layers, applied in drilling equipment and methods, earthwork drilling, drilling equipment, etc., to achieve the effect of wide practical range, wide pressure resistance range and good hole sealing effect

Inactive Publication Date: 2015-07-15
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can realize the sealing of surrounding rock fissures around the drilling hole, and in the process of hydraulic fracturing, the fracturing failure will not be caused by problems such as the sealing strength or the distribution of cracks at the sealing hole

Method used

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  • Hydraulic fracturing crossing hole pitchup hole sealing method of broken surrounding rock
  • Hydraulic fracturing crossing hole pitchup hole sealing method of broken surrounding rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for sealing upward holes in hydraulic fracturing drilling holes in broken surrounding rocks, comprising the following steps:

[0022] 1) Drilling: In the fracturing drilling site, use a fully hydraulic drilling rig and a drill bit with a diameter of 118mm to drill. Adjust the drilling depth according to the spatial relationship of the fracturing drilling site, which should be greater than 5 times the width of the space along the drilling direction).

[0023] 2) Casing: In the large hole, a plastic casing with an outer diameter of 108mm is introduced, and a 5m-long plastic return pipe with an outer diameter of 8mm is introduced between the casing wall and the borehole wall. The gap between the casing wall, the borehole wall and the air return pipe is simply fixed with polyurethane, and then the air return pipe is used to inject cement slurry for sealing, and the sealing length is less than 5m.

[0024] 3) High-pressure grouting: Use a grouting pump to inject ce...

Embodiment 2

[0030] 1. Experiment location: According to the development and production design of Linhuan Coal Mine and the gas control plan, it is preliminarily determined that the roof hydraulic fracturing experiment will be carried out in the 9th coal seam floor rock roadway of Linhuan Coal Mine-9134 machine roadway floor pumping and drainage roadway. Three fracturing points of 3#, 4# and 5# are arranged, which are respectively located at 13#, 15#, and 17# drilling sites of the floor pumping and drainage lanes of 9134 machine roadway, and the fracturing sequence is 3#→4#→5#.

[0031] 2. Drilling design:

[0032] In each fracturing drilling site, a fracturing hole is constructed perpendicular to the center line of the floor pumping and drainage roadway of 9134 machine roadway and facing the direction of the 9th coal seam.

[0033] 3#, 4#, 5# fracturing point fracturing drilling final hole reaches 0.5m of the roof of the 9th coal seam, adjust the design drilling inclination, so that the l...

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Abstract

The invention discloses a hydraulic fracturing crossing hole pitchup hole sealing method of a broken surrounding rock. A hole is drilled; a plastic casting is leaded into the drilled hole; a plastic air return pipe is leaded between the wall of the casing and the wall of the drilled hole; after cement slurry is injected into the casing, a concentric round hole is drilled in the step drilling place; the drilling length reaches a coal seam or top plate place; and the cement slurry is used for sealing by a three-section hole sealing process. The method overcomes the potential safety hazard caused by the leakage of fracturing fluid in no fracturing, and has the advantages of high hole sealing efficiency, good hole sealing effect, wide application range, wide pressure resistant range and recyclability.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing hole sealing, and in particular relates to a method for sealing upward holes in hydraulic fracturing piercing layers of broken surrounding rock. Background technique [0002] In recent years, underground hydraulic fracturing anti-permeability technology in coal mines has gradually become a conventional means of gas prevention and control. However, the quality of drilling and sealing directly determines the success or failure of hydraulic fracturing. The existing hydraulic fracturing drilling and sealing technology mainly has the following aspects: 1) In the development of special hydraulic fracturing sealers, such as bladder belt sealers, high-strength combined hole sealers, high-pressure hydraulic sealers, etc. Hole sealer, etc. 2) In terms of sealing materials, there are mainly modified expansion resins, expansion cement, expansion cement composite materials, high-strength cement, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B7/20E21B7/28
CPCE21B7/20E21B7/28E21B33/13
Inventor 孙光中田坤云王公忠张惠聚郭兵兵
Owner HENAN INST OF ENG
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