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Drilling method and drilling tool for step-by-step strengthening soft coal rock strength

A step-by-step strengthening and soft coal rock technology, which is applied to drilling equipment and methods, drill pipes, drill pipes, etc., can solve the problems of easy hole collapse and difficult drilling in soft coal rock drilling, so as to improve the depth and Drilling efficiency, prevention of borehole collapse, and the effect of improving strength

Active Publication Date: 2018-07-24
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a step-by-step strengthening soft coal rock strength drilling method and drilling tools to solve the technical problems of easy hole collapse and difficult drilling in soft coal rock drilling construction

Method used

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  • Drilling method and drilling tool for step-by-step strengthening soft coal rock strength
  • Drilling method and drilling tool for step-by-step strengthening soft coal rock strength
  • Drilling method and drilling tool for step-by-step strengthening soft coal rock strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: step by step strengthening soft coal rock intensity drilling method, comprises the following steps:

[0031] ①. Take coal or rock samples at the site to be constructed, and determine the solidity coefficient of coal and rock through laboratory tests f ; Determination of coal seam gas pressure at the construction site p ;

[0032] ②. According to the solidity coefficient of coal and rock at the construction site f Determining the number of strengthening stages N of coal and rock mass and the length L of graded strengthening n , Grading Intensification Ratio d q-n ;Number of strengthened stages N is the number of segments of the coal-rock strengthened drill bit structure along the axial direction of the borehole, and the length of each segment is the graded strengthened length L n (n=1, 2, ..., n); graded strengthening ratio d q-n (n=1, 2,..., n) is the graded strengthening length L of the coal rock strengthening drill bit n The maximum diameter d...

Embodiment 2

[0042] Embodiment two: if Figure 7 ~ Figure 8 As shown, the difference from Example 1 is that the number of strengthening stages of coal and rock mass is 4, which is beneficial to improve the step-by-step strengthening effect.

Embodiment 3

[0043] Embodiment three: as Figure 9 ~ Figure 10 As shown, the difference from Example 1 is that the number of strengthening stages of the coal and rock mass is 5, and the middle section of the step-by-step strengthening body 11 is designed to be cylindrical, which is conducive to further stabilizing the strengthening effect of the front section.

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Abstract

The invention discloses a drilling method and a drilling tool for step-by-step strengthening soft coal rock strength. According to the drilling method for step-by-step strengthening the soft coal rockstrength, a coal-rock mass strength grade N, a graded strengthening length L<n>, a graded strengthening ratio d<q-n>, a coal rock bit rotational speed v<c> are determined based on a coal rock solidity coefficient f, a drilling speed v<d> and an air supply volume Q are determined based on the coal rock solidity coefficient f and gas pressure p, and a design form of the drilling tool for step-by-step strengthening the soft coal rock strength is determined. The drilling tool for step-by-step strengthening the soft coal rock strength includes a coal rock step-by-step strengthening drill bit, arotary sealing joint, a coal rock drill bit and a drill rod. In view of the technical difficulties of soft coal rock drilling, the geological conditions of coal seams are taken into consideration, and the invention discloses the drilling method for step-by-step strengthening the soft coal rock strength and the drilling tool; the drilling tool for step-by-step strengthening the soft coal rock strength is applied to the construction of drilling, and the synergistic drilling process scheme of ''first step-by-step strengthening-post drilling'' of soft coal rock is realized, and the drilling effect of soft coal rock formations can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of drilling engineering for weak coal rock formations, and in particular relates to a drilling method and a drilling tool for step-by-step strengthening of soft coal rock strength. Background technique [0002] At present, the drilling construction of weak coal rock formations is a major problem in the field of drilling engineering technology. During the drilling process of weak coal rock formations, due to the large amount of deformation and easy instability and damage of the borehole, the drilling resistance is large and the slag discharge is difficult, resulting in shallow drilling depth and low drilling efficiency. Drilling and other drilling accidents occur frequently. Especially in the drilling construction of gas-containing soft coal seams in coal mines, affected by factors such as ground stress, gas pressure, and structural stress, the drilling deformation and damage are extremely serious, the drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/04E21B17/05E21B17/22
CPCE21B7/00E21B7/04E21B17/05E21B17/22
Inventor 王永龙马耕周福宝孙玉宁王振锋宋维宾
Owner HENAN POLYTECHNIC UNIV
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