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Diameter variable PDC directional drill bit

A directional drill bit, variable technology, applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc., can solve the problems of drill bit sticking, achieve stable and reliable structure, precisely control the size of the drill bit, and ensure safety

Active Publication Date: 2020-05-08
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • 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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  • Diameter variable PDC directional drill bit
  • Diameter variable PDC directional drill bit
  • Diameter variable 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 diameter variable PDC directional drill bit. The diameter variable PDC directional drill bit is provided with a drill bit body; a diameter variable cutting component is at least arranged in the radial direction of the drill bit body; the cutting diameter of the drill bit body is changed through linear displacement of the diameter variable cutting component; a gear-rack transmission mechanism is in linkage with the diameter variable cutting component and is embedded into the drill bit body; an elastomer is arranged on the gear-rack transmission mechanism in a sleevingmanner; and a fixed cutting component is also arranged in the radial direction of the drill bit body. After drilling is completed, the size of the outside diameter of the diameter variable PDC directional drill bit disclosed by the invention is reduced, so that the sizes of the outside diameters of a wire measuring drill pipe, a non-magnetic rod, a screw motor and the drill bit connected from a hole orifice are consistent; the problem of jamming of the drill bit caused by drilling hole shrinkage is effectively solved; and the safety of drilling is ensured. The transfer from axial movement to radial movement is realized by adopting the gear-rack transmission mechanism; the structure is stable and reliable; the bearing capacity is high; the transmission precision is high; and the size of thedrill bit can be controlled precisely.

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 Applications(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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