The research of breaking rock with liquid-solid two-phase jet flow

[摘要] Particle impact drilling is an efficient way of breaking rock, which is mainly used in deep drilling and ultra-deep drilling. The differential equation was established based on the theory of Hertz and Newton's second law, through the analysis of particle impact rock, the depth of particles into the rock was obtained. The mathematical model was established based on the effect of water impact crack. The research results show when water jet speed is more than 40 m/s, rock stability coefficient is more than 1.0, the rock fracture appear. Through the experimental research of particle impact drilling facilities, analysis of cuttings and the crack size which was analyzed through Scanning electron microscope consistent with the theoretical calculation, the validity of the model was verified.

[发布机构] School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing Heilongjiang; 163318, China^1;China National Petroleum Corporation, Beijing; 100724, China^2

[效力级别] 材料科学

[关键词] Effect of water;Experimental research;Newton's second law;Particle impact;Research results;Rock stability;Theoretical calculations;Ultra-deep drilling