CN101122238A

CN101122238A - Drilling hole inside directional dissevering method

Info

Publication number: CN101122238A
Application number: CNA2007101545689A
Authority: CN
Inventors: 杜志刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-22
Filing date: 2007-09-22
Publication date: 2008-02-13

Abstract

A directional cutting method inside a drill hole is characterized in that a high-pressure pipe is arranged inside the drill hole; an end cutting-hole is arranged at the high-pressure pipe of the final drill hole position; when the high-pressure liquid ejects from the cutting-hole, cracks will be made by the liquid around the cutting hole to control the rotation and movement of the high-pressure pipe, and the cutting hole will rotate and move as well, so as to realize the directional cutting inside the drill hole.

Description

Drilling hole inside directional dissevering method

Technical field:

Drilling hole inside directional dissevering method belongs to the coal mining field, is specially adapted to the colliery coal bed drilling and improves gas extraction amount.

Background technology:

By retrieval comprehensively both at home and abroad, the up-to-date technology of method that improves the colliery coal bed drilling amount of drawing out methane is: the patent of " method of increasing gas exhaustion of coal mine bed by hole drilling " number of patent application 200710084545.0, its shortcoming is to utilize the impact of compressed air moment pressure release, cause the scope of rib increase permeability little, depth as shallow, thereby the amount of drawing out methane that increases is few, and coal-bed flooding area in the past is big, and the destruction roof and floor causes the crack to link up with big lane space can't the sealing of hole extraction.

Summary of the invention:

The objective of the invention is the problem at above-mentioned existence, lithology and ature of coal according to difference boring have realized drilling hole inside directional dissevering, have enlarged the inner scope of freedom and the crack, space of boring, have promoted the coal bed drilling gas emission.

The feature of drilling hole inside directional dissevering method is in boring inside pressure piping to be installed, pressure piping at the boring end hole part is equipped with the termination and cuts the hole, when highly pressurised liquid is cut from the termination when spraying the hole, highly pressurised liquid just cuts the crack to borehole circumference, the control pressure piping rotates, moves, the termination is cut the hole and is also together rotated, moves, thereby has realized drilling hole inside directional dissevering method; Wherein the termination feature of cutting the hole is perpendicular to the drilling axis direction a circular hole or a crack between φ .01～0.5mm; The pressure of highly pressurised liquid is 0.6～45MPa.

Drilling hole inside directional dissevering method compared with prior art has the following advantages:

1, method is simple, and is remarkably productive, easy to operate.

2, it is controlled that direction is isolated in boring inside, isolates the degree of depth, and the scope of isolating is controlled.

3, enlarged the inner scope of freedom and the boring inner space of boring.

4, promoted the inner gas emission of boring.

5, do not destroy coal seam and roof, more do not destroy the sealing of hole effect.

Description of drawings:

Accompanying drawing is the drilling hole inside directional dissevering method schematic diagram.

1, pressure piping; 2, the hole is cut in the termination; 3, highly pressurised liquid;

4, cut the crack; 5, boring.

The specific embodiment:

Now be example explanation with the accompanying drawing: the pressure piping (1) that belt end is cut hole (2) extend into the whole hole site of boring (5), Open valve then, highly pressurised liquid (3) rushes at the hole wall of boring (5), and orientation is isolated formation crack (4), control pressure piping (1) rotates, moves, the termination is cut hole (2) and is also together rotated, moves, thereby has realized drilling hole inside directional dissevering method.

Claims

1. the feature of drilling hole inside directional dissevering method is: in boring inside pressure piping is installed, pressure piping at the boring end hole part is equipped with the termination and cuts the hole, when highly pressurised liquid is cut from the termination when spraying the hole, highly pressurised liquid just cuts the crack to borehole circumference, the control pressure piping rotates, moves, the termination is cut the hole and is also together rotated, moves, thereby has realized drilling hole inside directional dissevering method.

2. the feature of cutting the hole according to the described termination of claim 1 is perpendicular to the drilling axis direction a circular hole or a crack between φ .01～0.5mm.

3. the pressure according to claim 1 and 2 described highly pressurised liquids is 0.6～45MPa.