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Composite conic single gear drill bit

A single-cone, cone-shaped technology, which is applied in the direction of drill bits, drilling equipment, and earthwork drilling, can solve the problems of poor use effect and fast wear of cutting teeth, improve the use and footage effect, improve impact rock breaking performance, The effect of reducing overall cost

Inactive Publication Date: 2007-05-23
SINOPEC OILFIELD EQUIP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in hard formations, the cutting teeth (teeth) of this full-bore mode single-cone bit wear quickly, and the use effect is poor.

Method used

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  • Composite conic single gear drill bit
  • Composite conic single gear drill bit
  • Composite conic single gear drill bit

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Further illustrate the embodiment of the present invention below in conjunction with accompanying drawing, single cone bit comprises tooth palm 1 and cone 2, and the outer peripheral surface of cone is by lateral long back cone surface 6, downward external cone surface 5 and lower end The main cone surface 4 is combined, and the long back cone surface can be stepped to form a composite cone cone, wherein the back inclination angle β of the long back cone surface is 40-45°, and the main cone surface is a negative cone surface, its The angle between the busbar and the center line of the cone is α = 80°, the generatrix of the long back cone, outer cone and main cone can be straight or curved, and the long back cone, outer cone and main cone of the cone There are tooth holes 8 drilled on the top, and cutting teeth (teeth) 3 are inlaid in the tooth holes, and multiple rows of interlaced cutting teeth are inlaid on the long back cone surface, and the cutting teeth are cone sph...

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PUM

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Abstract

The composite conic single-gear drill bit compprises bit leg and gear mounted on the lower end of bit leg, which is characterized by that the peripheral surface of the gear is formed from extra-long back cone, external cone and main cone from top to bottom, every cone is equipped with cutting teeth, the described main cone is negative cone, and the back tilt angle beta of extra-long back cone is 20-80% of that of cone. Said composite tri-cone rotary drill bit can be extensively used in the fields of petroleum exploration, mine and geologic drilling.

Description

technical field [0001] The invention relates to a single-cone drill bit used in the fields of petroleum, mining and geological drilling, in particular to a composite cone-shaped single-cone drill bit. Background technique [0002] The single-cone bit is mainly composed of the palm and the cone. The existing cone structure is mostly spherical or stepped spherical, and the spherical surface is equipped with cutting teeth. The single-cone drill with this structure is a full-bore drill bit. , mainly breaks rock by cutting, forming a bottom hole pattern with a network cutting track. In this cutting mode, there are many cutting teeth that contact the bottom of the well at the same time, the contact time is long, and the drill bit works smoothly. The single-cone bit with this cone structure has strong applicability in soft to medium-hard formations, and the use effect is better. However, in hard formations, the cutter (teeth) of this full-bore single-cone drill bit wears quickly,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/16
Inventor 刘学中赵彦
Owner SINOPEC OILFIELD EQUIP CORP