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Drill bit special for reverse circulation drilling

A reverse circulation and drill bit technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of short diameter keeping time, easy blockage and rock-carrying ability, and achieve the effect of prolonging the service life and accelerating the return speed.

Active Publication Date: 2021-02-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a special drill bit for reverse circulation drilling, which solves the technical problems of the existing reverse circulation drilling drill bit, such as short gage protection time, easy clogging and poor rock-carrying ability

Method used

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  • Drill bit special for reverse circulation drilling
  • Drill bit special for reverse circulation drilling
  • Drill bit special for reverse circulation drilling

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Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0036] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0037] like Figure 1-10 Shown:

[0038] The invention provides a special drill bit for reverse circulation drilling, which includes a cutting tooth composite sheet 1, a cutting tooth base body 2, a drill bit base body 10, a piston casing 12, a pressurizing p...

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Abstract

The invention provides a drill bit special for reverse circulation drilling, and relates to the technical field of reverse circulation drilling tools. The drill bit solves the technical problems thatan existing reverse circulation drilling drill bit is short in gauge protection time, prone to blockage and poor in rock-carrying capacity. The drill bit special for reverse circulation drilling comprises a drill bit base body (10), a piston outer sleeve (12), a pressurizing piston (13), and a pressurizing connecting part (18); the drill bit base body (10) is connected with the pressurizing connecting part (18) through a flat key (20); a piston outer sleeve rectangular ring (11) is installed between the piston outer sleeve (12) and the drill bit base body (10) in a sealed mode; and a first piston rectangular ring gas ring (14), a piston rectangular ring oil ring (15) and a second piston rectangular ring gas ring (16) are installed between the piston outer sleeve (12) and the pressurizing piston (13) in a sealed mode. According to the drill bit special for reverse circulation drilling, strong rock shearing and breaking capacity, lasting gauge protection duration, easy rock carrying, strong suction force, blockage prevention and self-pressurization function in the drilling process can be realized, and the drill bit has the characteristics of efficient and stable operation of the reverse circulation drilling process.

Description

technical field [0001] The invention relates to the technical field of reverse circulation drilling tools, in particular to a special drill bit for reverse circulation drilling. Background technique [0002] Reverse circulation drilling means that the medium (drilling fluid, air, etc.) enters the wellbore from the annulus to the bottom of the well from the ground drilling equipment through the pipeline, and carries cuttings through the reverse circulation special drill bit, drilling tool inner eye, faucet, standpipe, etc. A drilling technique to the surface. [0003] Reverse circulation drilling technology can effectively reduce the equivalent mud density at the bottom of the well and reduce the repeated grinding rate of cuttings at the bottom of the well. It has been widely used in the field of energy mining in recent years. Gas lift reverse circulation is to make the drilling medium along the annular space of the well wall, the reverse circulation drill bit, and the inner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/60E21B21/00
CPCE21B10/60E21B21/00
Inventor 李黔尹虎郭亮王国强
Owner SOUTHWEST PETROLEUM UNIV
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