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Double-stage drill bit

A drill bit and bit body technology, which is applied to drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of low ROP and poor bit stability, and achieve the effects of reducing rock strength, reducing wear and reducing wear and tear.

Inactive Publication Date: 2016-01-06
SOUTHWEST PETROLEUM UNIV
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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 overcome the shortcomings of the above-mentioned prior art, a two-stage drill bit, this structure can effectively solve the problems of low mechanical penetration rate and poor stability of the drill bit in deep formations and large boreholes

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0033] refer to figure 1 As shown, a two-stage drill bit includes a drill body (1), a fixed blade (2), a fixed cutting tooth (3), a flute (4), a nozzle (5), etc., and is characterized in that: the core of the drill bit The inner cutting structure (22) is formed by inward depression, and together with the outer cutting structure (21), a stepped two-stage drill bit is formed.

[0034] As an option, the core of the drill bit is sunken inward, and the outline of the core is a straight line, a parabola, an arc, a spline curve, etc., such as figure 2 , 3 shown.

[0035] As an option, the core of the drill bit is sunken inward, and its inner sunken depth H1≥20mm, such as figure 2 , 3 shown.

[0036] As an option, the cutting area at the core of the drill bit reaches more than 40% of the radial area of ​​the drill bit, that is, R1 / R2≥0.4, such as figure 2 , 3 shown.

[0037] Alternatively, the drill bit diameter is 9.5 inches or greater.

[0038] Alternatively, the cutting...

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Abstract

The invention discloses a double-stage drill bit. The double-stage drill bit comprises a drill bit body, fixed blades, fixed cutting teeth, chip grooves, nozzles and the like and is characterized in that the core of the drill bit is inwardly concave to form a core cutting structure, and the core cutting structure and an outer cutting structure form the stepped double-stage drill bit. By the structure, the double-stage drill bit has the advantages that the problems that the drill bit is low in mechanical drilling speed and poor in stability when the drill bit is in a large well hole of a deep stratum are solved effectively, the outer cutting structure cuts annular crushed zones in the well hole first to form annular stress release faces in well-bottom rock, and drill bit rock breaking efficiency is increased favorably; protruded rock is formed at the core area of the drill bit, and drill bit stability is increased favorably; the well-bottom drilling parameters of large-size drill bits can be changed, double-stage cutting structure drilling pressure and torque proportion can be reasonably adjusted and allocated, and drilling efficiency is increased.

Description

technical field [0001] The invention belongs to the technical fields of drilling such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and in particular relates to a two-stage drill bit. Background technique [0002] Fixed-tooth drill bit refers to a drill bit formed by welding or inlaying fixed cutting teeth on the drill body. Due to its fast drilling speed, long service life, high reliability and remarkable comprehensive economic benefits in soft to medium-hard formations, it is widely used in oil and natural gas in the world. It has been more and more widely used in drilling engineering in fields such as geothermal development and geothermal development. [0003] my country's oil and gas exploration direction is gradually shifting to deep formations, among which there are more and more deep wells above 5,000 meters and ultra-deep wells above 8,000 meters, but the problem of slow drilling speed of dee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/54
Inventor 黄奎林艾志久杨迎新任海涛陈炼牛世伟张春亮严成森
Owner SOUTHWEST PETROLEUM UNIV
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