中国石油大学学报（自然科学版）2025，Vol.49Issue(6)：107-115,9.DOI:10.3969/j.issn.1673-5005.2025.06.010
连续管钻井低扭矩钻头破岩机制及仿真
Mechanisms and simulation of rock breaking by low TOB drill bit for coiled tubing drilling
摘要
Abstract
In this study,in order to address the issues of limited weight-on-bit(WOB)and shallow penetration depth in coiled tubing drilling,a design of a low torque on bit(TOB)PDC rock-breaking drill bit for coiled tubing was proposed.The-oretical analyses of cutting force ratio of PDC cutters,and cutting force distribution pattern of different cutters,including con-ventional cutter,chord-edge-cutter,and blunt angle cutter,were carried out,and single-cutter straight-line cutting rock-breaking experiments were conducted to investigate the impact of different cutter diameters and shapes on the cutting force.A full-scale PDC drill bit-rock interaction model was developed to study the rock-breaking performance of conventional cutter,chord-edge-cutter,and blunt angle cutter drill bits,which was validated through full-scale rock-breaking experiments.The results show that chord-edge-cutter and blunt angle cutter exhibit better penetration performance and have significantly more uniform cutting force compared to the conventional cutters,with 14.11%to 33.59%of cutting forces reduction.The errors of the simulation results using the established full-scale drill bit rock-breaking model are less than 15%compared to the experi-mental results,demonstrating a high accuracy of the model.Under the same RPM and WOB,blunt angle cutter PDC drill bits exhibit the best TOB reduction effect,with a maximum TOB reduction of 35.35%.It is recommended that blunt angle cutter PDC drill bits are more suitable for the low TOB rock-breaking in coiled tubing drilling than the conventional cutter bits.关键词
连续管/低扭矩/比压/钝角齿/破岩仿真Key words
coiled tubing drilling/low TOB/specific pressure/blunt angle cutter/rock-breaking simulation分类
能源科技引用本文复制引用
况雨春,陈亚轩,杨高,于东兵,余训星,陈佳同..连续管钻井低扭矩钻头破岩机制及仿真[J].中国石油大学学报（自然科学版）,2025,49(6):107-115,9.基金项目
中国石油集团工程技术研究院有限公司科学研究与技术开发课题(CPET202305) （CPET202305）
中国石油天然气集团有限公司科技项目(2023ZZ27) （2023ZZ27）
