Self-oscillation pulse reinforcement type inner grinding drill bit

Abstract

The invention discloses a self-oscillation pulse reinforcement type inner grinding drill bit. Different from a conventional PDC drill bit, a pulse generation device, a self-oscillation pulse generation device, a self-oscillation pulse reinforcement device, a negative pressure swabbing device and a rock debris inner grinding device are additionally arranged. The pulse generation device comprises a drilling fluid flow pass, a feeding cavity, a resonant cavity, a resonant pipe outlet and a shunting area, and generates pulsed jet through resonance of stimulation liquid based on an organ pipe. The self-oscillation pulse reinforcement device comprises a lower spraying flow pass, a self-oscillation spray nozzle and a cutter wing, and forms a large-size vortex ring structure through the self-oscillation spray nozzle based on a Helmholtz resonant cavity to reinforce pulsed jet. The negative pressure swabbing device comprises a reverse high-speed flow pass and a swabbing cavity, and forms negative pressure in the swabbing cavity by the aid of reverse jet high-speed characteristic to swab rock debris. The rock debris inner grinding device comprises a mixing cavity, a throat channel, an acceleration cavity, an inner grinding cavity, an inner grinding body, a bypass and a diffusion cavity, and is used for crushing the rock debris based on high-pressure action force and a water wedge effect, rock carrying is facilitated, and a cuttings bed is removed.

Description

technical field [0001] The invention belongs to the field of oil and gas well drilling, in particular to a self-excited oscillation pulse enhanced internal grinding drill bit. Background technique [0002] Due to its asymmetric, non-uniform and unstable characteristics, pulse jet can greatly improve the hydraulic-assisted rock-breaking efficiency compared with conventional steady-state jet. Both theoretical research and field tests have proved that pulse jet has a broad application prospect in the field of drilling. [0003] The pulsed jet is easy to attenuate, how to enhance the pulsed jet, especially stepwise enhanced pulsed jet, has been paid more and more attention by relevant technicians. The self-excited oscillating nozzle based on the Helmholtz oscillating cavity generates a high-pressure pulse jet by forming a large-scale vortex ring structure, and forms a local negative pressure at the bottom of the drill bit to improve the hydraulic-assisted rock breaking efficienc...

AI Technical Summary

Problems solved by technology

[0005] In the drilling of horizontal wells, cuttings are often accumulated due to unfavorable rock carrying and untimely cleaning of rocks, resulting in cuttings beds, which seriously restrict the ROP and drilling costs, resulting in complicated drilling accidents such as pump holding, poor drilling, and even drilling. occur

Conventional solutions are mostly to increase drilling speed, increase displacement, add lubricant, lift and lower the drilling tool in a short distance, and push the large-grained cuttings near the drill bit back to the bottom of the well for repeated crushing. Although there is a certain effect, but Reduced ROP, unable to fundamentally remove cuttings beds in horizontal wells

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