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A special drill bit 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: 2022-06-21
SOUTHWEST PETROLEUM UNIV
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  • 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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  • A special drill bit for reverse circulation drilling
  • A special drill bit for reverse circulation drilling
  • A special drill bit for reverse circulation drilling

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Embodiment Construction

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

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

[0037] like Figure 1-10 shown:

[0038] The present invention provides a special drill bit for reverse circulation drilling, comprising a cutting tooth composite sheet 1, a cutting tooth base body 2, a drill bit base body 10, a piston casing 12, a pressurizing piston 13 and a pressurizing conn...

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Abstract

The invention provides a special drill bit for reverse circulation drilling, which relates to the technical field of reverse circulation drilling tools, and solves the technical problems of the existing reverse circulation drilling drills, such as the length of diameter protection, easy blockage and poor rock-carrying ability, the special drill bit for reverse circulation drilling It includes a drill base (10), a piston jacket (12), a pressurized piston (13), and a pressurized connector (18). The drill base (10) is connected to the pressurized connector (18) through a flat key (20), A piston outer rectangular ring (11) is sealed between the piston outer casing (12) and the drill base body (10), and a piston rectangular ring gas ring one (14), The piston rectangular ring oil ring (15) and the piston rectangular ring gas ring two (16) are connected. The invention can realize strong shearing and rock breaking ability in the drilling process, long-lasting diameter protection, easy rock carrying, strong suction, anti-blocking, self-pressurizing function, and has the characteristics of efficient and stable operation in 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 ground drilling equipment through the pipeline from the annulus to the bottom of the well, and carries the cuttings through the special reverse circulation drill bit, the inner hole of the drilling tool, the faucet, the riser, etc. A drilling technique to the surface. [0003] Reverse circulation drilling technology can effectively reduce the bottom hole equivalent mud density and reduce the repeated grinding rate of bottom hole cuttings. It has been widely used in the field of energy exploitation in recent years. Gas lift reverse circulation is to circulate the drilling medium along the well wall annulus, reverse the circulation bit, and the inner pipe of the dou...

Claims

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Application Information

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Patent Type & Authority Patents(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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