A variable diameter pdc directional drill bit

A directional drill bit and variable technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve problems such as drill bit sticking, and achieve the effects of stable and reliable structure, good directional drilling performance, and precise control of drill bit size.

Active Publication Date: 2022-03-15
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to develop a variable-diameter PDC directional drill bit to meet the requirements of normal directional drilling and effectively solve the problem of drill bit sticking caused by borehole diameter reduction, thereby reducing the risk of accidents in drilling construction

Method used

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  • A variable diameter pdc directional drill bit
  • A variable diameter pdc directional drill bit
  • A variable diameter pdc directional drill bit

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Embodiment Construction

[0040] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0041] In this disclosure, unless stated otherwise, the used orientation words such as "up, down, left, right, front, back" generally correspond to up, down, left, right, front, back in the drawings, Wherein, "up, down" corresponds to the vertical direction or the height direction, and "left, right" corresponds to the horizontal direction, wherein, "up, down" refers to the upward or downward movement of the corresponding component in the vertical direction. The "reverse linear displacement" mentioned in this disclosure refers to the movement of two moving bodies on the same straight line, and the displacement along the direction that makes the two moving bodi...

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Abstract

The invention discloses a variable-diameter PDC directional drill, which is provided with a drill body, and a variable-diameter cutting member is arranged on the drill body at least radially, and the linear displacement of the variable-diameter cutting member realizes the cutting diameter of the drill body. Change; in conjunction with the variable-diameter cutting member, a rack-and-pinion transmission mechanism is embedded in the drill bit body, and an elastic body is sleeved on the rack-and-pinion transmission structure; radially on the drill bit body A stationary cutting member is also provided. After the drilling is completed, the outer diameter of the variable-diameter PDC directional drill bit of the present invention becomes smaller, thereby forming a wired measurement drill pipe connected from the hole, a non-magnetic drill pipe, a screw motor and a drill bit with the same outer diameter, effectively solving the problem of It solves the problem of drill bit sticking caused by the shrinkage of the drill hole, and ensures the safety of the drill hole. The rack and pinion transmission structure is adopted to realize the transfer from axial movement to radial movement. The structure is stable and reliable, the bearing capacity is large, the transmission precision is high, and the size of the drill bit can be precisely controlled.

Description

technical field [0001] The invention relates to a drill bit for underground drilling in coal mines, in particular to a variable-diameter PDC directional drill bit. Background technique [0002] With the development of underground directional drilling technology in coal mines, it has been widely used in drilling fields such as gas drainage, grouting reinforcement, and water exploration. The strata encountered in underground coal mines include both coal seams and complex and changeable rock formations. When drilling into loose, broken, and easily collapsed rock formations or coal seams, the diameter of the borehole is likely to become smaller after the hole is formed, that is, the phenomenon of diameter shrinkage. A stuck drill accident occurred. At present, for the treatment of drill stuck accidents, the method of strong pulling is mostly adopted, but this method can easily cause the drill pipe to break, thereby causing a drill drop accident, which eventually causes a large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/43E21B10/46E21B10/60E21B10/62
CPCE21B10/43E21B10/46E21B10/60E21B10/62
Inventor 王传留居培张献振高晓亮郝永进兰菲李耿郭东琼
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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