Bionic drilling method and drill rod for resistance reduction and heat dissipation of soft coal petrography

A bionic drilling technology for soft coal rocks, applied to drilling equipment and methods, drill pipes, drill pipes, etc., can solve problems such as low drilling efficiency, many drilling accidents, shallow drilling depth, etc., to improve drilling Efficiency, increasing drilling depth and reducing drilling resistance

Inactive Publication Date: 2016-04-06
HENAN POLYTECHNIC UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a bionic drilling method for reducing resistance and heat dissipation of soft coal and rock and a drill pipe, which solves the problem of large drilling resistance, shallow drilling depth and low drilling efficiency of conventional drilling tools. , the problem of many drilling accidents

Method used

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  • Bionic drilling method and drill rod for resistance reduction and heat dissipation of soft coal petrography
  • Bionic drilling method and drill rod for resistance reduction and heat dissipation of soft coal petrography
  • Bionic drilling method and drill rod for resistance reduction and heat dissipation of soft coal petrography

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Experimental program
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Effect test

Embodiment 1

[0032] like Figure 1 ~ Figure 3 As shown, the bionic drilling method for resistance reduction and heat dissipation in soft coal rocks is used to evaluate the drilling shrinkage ratio according to the geological conditions of the coal seam d c And determine the outer diameter of the drill pipe rotation d 1 , Drill pipe surface raised height H 1 , the distance L between the convex shapes on the surface of the drill pipe and the drilling speed, use the bionic drill pipe for reducing resistance and heat dissipation to drill holes, and realize low-resistance and low-temperature integrated drilling, which specifically includes the following steps:

[0033] ①. Take coal or rock samples at the site to be constructed, and evaluate the drilling shrinkage ratio through laboratory tests and theoretical calculations d c (drilling shrinkage ratio d c is the maximum displacement of the borehole wall deformation u p and the ratio of the radius r when the borehole is not contracted);...

Embodiment 2

[0042] Embodiment two: if Figure 4 ~ Figure 6 As shown, the difference from the first embodiment is that the bionic structure on the surface of the bionic drill pipe for reducing resistance and heat dissipation is a square protrusion 5 .

Embodiment 3

[0043] Embodiment three: as Figure 7 ~ Figure 9 As shown, the difference from Embodiment 1 and Example 2 is that the arc-shaped grooves 6 on the surface of the drill pipe in Embodiment 3, the distance L between the arc-shaped grooves 6 is set within the range of 10 mm to 80 mm, and the arc-shaped grooves 6 depth H 2 Set it within the range of 0mm to 5mm. When the drilling shrinkage ratio is 0≤ d c When ≤50%, the surface groove depth H of the drill pipe 2 Set it within the range of 0mm to 3mm; when the drilling shrinkage ratio d c When >50%, the arc-shaped groove 6 depth H on the surface of the drill pipe 2 Set it within the range of 3mm to 5mm.

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Abstract

The invention discloses a bionic drilling method and drill rod for resistance reduction and heat dissipation of soft coal petrography. According to the geological condition of coal seams, based on the bionic drilling method for resistance reduction and heat dissipation of soft coal petrography, the contraction ratio d[c]of a drill hole is evaluated, and the rotation outer diameter d[1] of the drill rod, the height of convex or concave structures on the surface of the drill rod, the distance between the convex or concave structures on the surface of the drill rod, and the drilling speed are determined. The bionic drill rod comprises a rod body, a convex connecting part and a concave connecting part. The convex or concave structures are arranged on the surface of the drill rod. Aiming at the technical problem that soft coal petrography drilling is hard and considering the geological condition of coal seams, the bionic drilling method and drill rod for resistance reduction and heat dissipation of soft coal petrography are provided. In the drilling process, drilling is conducted by means of the bionic drill rod for resistance reduction and heat dissipation, a low-resistance and low-temperature integral drilling technological system is obtained, and the soft coal petrography drilling effect can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of drilling engineering in weak coal rock formations, and in particular relates to a bionic drilling method for reducing resistance and heat dissipation of soft coal rocks and a drill pipe. Background technique [0002] At present, the drilling construction of weak coal rock formations is a difficult problem in the field of drilling engineering technology. During the drilling process of weak coal rock formations, due to the serious deformation and damage of the borehole, the high drilling resistance and the difficulty of slag discharge, the drilling depth is shallow and the drilling efficiency is low. send. Especially in the drilling construction of soft coal seams, due to the low strength of the coal body and the influence of factors such as ground stress, gas pressure, and structural stress, the shrinkage ratio of the borehole is extremely serious and the deformation is extremely serious. The entry resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B17/00
CPCE21B7/00E21B17/00
Inventor 王永龙孙玉宁王振锋宋维宾
Owner HENAN POLYTECHNIC UNIV
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