Tangential injection type whirl flow jet flow grinding drill bit for horizontal well

Abstract

The invention discloses a tangential injection type whirl flow jet flow grinding drill bit for a horizontal well. The grinding drill bit mainly comprises a PDC drill bit body and is characterized in that a debris discharging groove in the gauge protection portion of the PDC drill bit body is omitted, and the PDC drill bit body is internally and additionally provided with a tangential injection type rotating jet flow sand washing device, a high-concentration turbulence sand pumping device and a jet flow smashing device. According to the tangential injection type rotating jet flow sand washing device, high-speed rotation jet flow is generated through tangential injection type rotating jet flow spray nozzles, a well bottom whirl flow field beneficial to rock debris cleaning is formed, the stress condition of well bottom rock debris is improved, and the well bottom rock debris cleaning efficiency is improved. The high-concentration turbulence sand pumping device pumps and sucks the well bottom fluid based on the principle of a sand pumping pump, the well bottom pressure difference is reduced, unbalance is achieved, and the mechanical drilling speed is increased. The jet flow smashing device effectively smashes the rock debris based on the principle of a jet mill, the rock debris carrying efficiency is improved, the rock debris bed in the horizontal well is eliminated radically, and safe and efficient drilling of the horizontal well is finally achieved.

Description

technical field [0001] The invention belongs to the field of drilling and oil and gas engineering, in particular to a horizontal well tangential injection type swirl jet mill drill bit. 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, the jet mill bit for safe and efficient mud drilling for horizontal wells (CN201310654747.4) and the jet mill bit for safe and efficient gas drilling for horizontal wells (CN201310654718.8) recently developed by China University of Petroleum (Beijing) can not only reduce the bottom hole pressure difference, To incr...

AI Technical Summary

Problems solved by technology

However, due to the diversion effect of the reverse nozzle of the jet mill drill bit, the flow rate of the drilling fluid at the bottom of the well is reduced, so the number of water holes of the drill bit at the bottom of the well is reduced, and the range of jet flushing is also significantly reduced

Although the high-concentration turbulent sand pumping device of the jet mill bit can reduce the pressure difference at the bottom of the hole and suck cuttings, but due to the small range of jet flushing, it will affect the timely cleaning of cuttings at the bottom of the well, resulting in repeated crushing of some cuttings. Affect rock breaking efficiency

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