Safe and efficient mud drilling jet mill bit for horizontal wells

Abstract

The invention discloses a safe and efficient mud drilling jet mill bit for horizontal wells. The safe and efficient mud drilling jet mill bit is characterized in that a jet crushing device and a high-concentration turbulence sand-pumping device are mounted on a conventional bit. The jet mill bit mainly comprises a jet crushing part and a high-concentration turbulence sand-pumping part. The jet crushing part is characterized by comprising reverse natural-vibration cavitation jet nozzles, mixing chambers, throat tubes, debris separation accelerating tubes, crushing targets, crushing chambers and bypasses; the high-concentration turbulence sand-pumping part is characterized by comprising well-bottom debris stirring and cleaning channels, debris suction tubes and bit nozzles. On the basis of principles of a sand pump, the debris suction tube and the well-bottom debris stirring and cleaning channel function in pumping high-concentration turbulence debris, so that well bottom pressure difference can be reduced effectively and mechanical drilling speed is increased; on the basis of the principles of the jet mill, debris is crushed further under hydraulic pulse cavitation jet effect, so that liquid and solid suspending flowing is achieved and debris beds formed in the horizontal wells is eliminated.

Description

technical field [0001] The invention belongs to the field of drilling and oil and gas engineering, in particular to a jet mill bit used for safe and efficient mud drilling of horizontal wells. Background technique [0002] As we all know, rock carrying is an important problem in drilling horizontal wells and extended reach wells. If the cuttings carrying effect cannot meet the requirements, it will lead to many problems, such as high friction and high torque, sand settling, pipe sticking, casing running and Difficulty in cementing, severe wear of drilling tools, difficulty in running logging instruments, etc., may even lead to suspension of drilling operations. However, one of the most important factors affecting the rock-carrying effect is the cuttings size. According to Stokes’ law, the final sedimentation velocity of cuttings is proportional to the square of the particle size of cuttings, so reducing the size of cuttings can greatly improve the carrying capacity. rock ef...

AI Technical Summary

Problems solved by technology

In order to control the cuttings bed on site, short tripping and drilling are often carried out, and even large-grained cuttings near the drill bit are pushed back to the bottom of the well for repeated crushing; low drilling pressure and high speed are adopted to prevent the cuttings produced by the first crushing of the drill bit too large, but this will reduce ROP

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