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PDC drill bit for well drilling

A drill bit and drilling technology, which is applied in the direction of drill bit, drilling equipment, earthwork drilling, etc., can solve the problems of damaged drill bit, drilling deviation, etc., and achieve the effect of improving stability and improving discharge efficiency

Active Publication Date: 2017-06-30
YICHANG SHENDA PETROMACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the drill bit moves at the bottom of the well, an unbalanced force will be generated at the junction of rock formations with different hardness, resulting in deviation of the drilling hole or even damage to the drill bit. There is an urgent need for a drill bit that can drill stably

Method used

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  • PDC drill bit for well drilling
  • PDC drill bit for well drilling
  • PDC drill bit for well drilling

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Embodiment Construction

[0023] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0024] figure 1 It is a schematic diagram of the cutting edge distribution of the PDC drill bit embodiment 1 for drilling in the present invention, A is the helix formed on the top of the cutting edge, and the cutting edge 2 and the secondary cutting edge 3 are distributed alternately; since the angle values ​​α, β and b are all Small, not clearly marked on the specific structure.

[0025] Such as figure 2 As shown, a PDC drill bit for drilling includes a drill body 1, and the interior of the drill body 1 is a flushing cavity 11; three cutting edges 2 are protrudingly arranged on the crown of the drill body 1, and the top ends of the cutting edges are not in the same plane. Instead, the helix structure is lowered in turn, the helix structure ...

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Abstract

The invention discloses a PDC drill bit for well drilling. The PDC drill bit comprises a drill bit body, a plurality of cutting edges and a plurality of flushing openings. A flushing cavity is formed in the drill bit body; the top ends of the cutting edges are reduced in sequence to form a spiral line structure, the cutting edges are arranged at a crown part of the drill bit body in a protruding mode, the angles formed between the adjacent cutting edges are different, a discharging groove is formed between any two adjacent cutting edges, a plurality of cutting tooth and a plurality of auxiliary cutting edges are arranged on the same sides of the cutting edges, the auxiliary cutting edges are arranged in the centers of the discharging grooves in a protruding mode and have the number equal to that of the discharging grooves, the tops of the auxiliary cutting edges are located at the midpoints of the connecting line of the top of the highest cutting edge and the top of the lowest cutting edge, and a plurality of auxiliary cutting teeth are arranged on the auxiliary cutting edges in the direction of the same sides of the cutting edges. The flushing openings are communicated with the flushing cavity. The problem that when a drill bit generates unbalanced force at the bottom of a well, the drill bit deflects is solved, and hole drilling stability is greatly improved.

Description

technical field [0001] The invention belongs to the field of PDC drill bits, in particular to a PDC drill bit for well drilling. Background technique [0002] The PDC drill bit is an integral drill bit, which is divided into two categories: matrix drill bit and steel body drill bit. The whole drill bit has no moving parts and has a relatively simple structure. . In the past few years, the quality and type of PDC cutting teeth have undergone tremendous changes, and they are widely used in geological exploration, mineral mining, oil and gas exploration and many other fields. When the drill bit moves at the bottom of the well, an unbalanced force will be generated at the junction of rock formations with different hardness, which will cause deviation of the drilling hole or even damage the drill bit. There is an urgent need for a drill bit that can drill holes stably. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention propos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/60
CPCE21B10/43E21B10/602Y02P70/10
Inventor 张翼付正兵杨光友傅红兵杜杨刘文彬姚远
Owner YICHANG SHENDA PETROMACHINE
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