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.
CN112392405BActive Publication Date: 2022-06-21SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2022-06-21

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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.
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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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