Composite rock-breaking of high-pressure CO_(2)jet&polycrystallinediamond-compact(PDC)cutter using a coupled SPH/FEM model  

作　　者：Can Cai Pei Zhang Daping Xu Xianpeng Yang Yingfang Zhou 

机构地区：[1]School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China [2]Key Laboratory of Groundwater Resources and Environment,Jilin University,Ministry of Education,Changchun 130021,China [3]Laboratory of High-pressure Jet Theory and Application Technology,Southwest Petroleum University,Chengdu 610599,China [4]School of Engineering,University of Aberdeen,Aberdeen AB243FX,United Kingdom [5]School of Intelligent Manufacturing,Panzhihua University,Panzhihua 617000,China

出　　处：《International Journal of Mining Science and Technology》2022年第5期1115-1124,共10页矿业科学技术学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.52004236);Sichuan Science and Technology Program(No.2021JDRC0114);the Starting Project of Southwest Petroleum University(No.2019QHZ009);the China Postdoctoral Science Foundation(No.2020M673285);the Open Project Program of Key Laboratory of Groundwater Resources and Environment(Jilin University);Ministry of Education(No.202005009KF);the Chinese Scholarship Council(CSC)funding(No.202008515107).

摘　　要：CO_(2) drilling is a promising underbalance drilling technology with great advantages,such as lower cutting force,intense cooling and excellent lubrication.However,in the underbalance drilling,the mechanism of the coupling CO_(2) jet and polycrystalline-diamond-compact(PDC)cutter are still unclear.Whereby,we established a coupled smoothed particle hydrodynamics/finite element method(SPH/FEM)model to simulate the composite rock-breaking of high-pressure CO_(2) jet&PDC cutter.Combined with the experimental research results,the mechanism of composite rock-breaking is studied from the perspectives of rock stress field,cutting force and jet field.The results show that the composite rock-breaking can effectively relieve the influence of vibration and shock on PDC cutter.Meanwhile,the high-pressure CO_(2) jet has a positive effect on carrying rock debris,which can effectively reduce the temperature rising and the thermal wear of the PDC cutter.In addition,the effects of CO_(2) jet parameters on composite rock-breaking were studied,such as jet impact velocity,nozzle diameter,jet injection angle and impact distance.The studies show that when the impact velocity of the CO_(2) jet is greater than 250 m/s,the CO_(2) jet could quickly break the rock.It is found that the optimal range of nozzle diameter is 1.5–2.5 mm,the best injection angle of CO_(2) jet is 60,the optimal impact distance is 10 times the nozzle diameter.The above studies could provide theoretical supports and technical guidance for composite rock-breaking,which is useful for the CO_(2) underbalance drilling and drill bit design.

关 键 词：C0_(2)drilling High-pressure C0_(2)jet&PDC cutter Composite rock-breaking Experimental study SPH/FEM method 

分 类 号：TE24[石油与天然气工程—油气井工程]