摘要
为对比各种冲击钻井技术的破岩效果,利用ABAQUS/Explicit模块建立PDC单齿-岩石冲击模型,研究PDC单齿在无冲击、轴向冲击、扭向冲击和复合冲击作用下的破岩特性,再进一步对影响复合冲击性能的因素进行分析。分析结果表明:在其他条件相同的条件下,复合冲击下的破岩比功相较于无冲击降低了28%,较轴向冲击降低了7%,以复合冲击破岩方式破岩效率最高;岩石在复合冲击作用条件下,钻压对PDC齿破岩效率影响较大,且存在明显差异,增大钻压有利于破碎岩石;转速对复合冲击破岩效率存在一个临界值,未达到这个值时,增大转速反而会降低PDC齿的破岩效率。所得结论可为复合冲击钻井工具选择合适的钻压和转速提供理论依据。
To compare the rock-breaking performances of various impact drilling techniques,a single-PDCcutter rock impact model was built using the ABAQUS/Explicit module to study the rock-breaking characteristics of a single PDC cutter in cases of no impact,axial impact,torsional impact and composite impact,and then the factors affecting the composite impact performance were analyzed.The results show that under identical conditions,the rock-breaking mechanical specific energy(MSE)in case of composite impact is 28%and 7%lower than that in cases of no impact and axial impact,respectively,and the rock-breaking efficiency is the highest in case of composite impact.Moreover,in case of composite impact,the weight on bit(WOB)has great and variable influences on the rock-breaking efficiency of the PDC cutter,and increasing WOB promotes rock breaking.The effects of the rotation speed on the composite impact rock-breaking efficiency are associated with a threshold,below which an increase in the rotation speed degrades the rock-breaking efficiency of the PDC cutter.The research findings provide theoretical references for selecting appropriate WOB and rotation speeds for composite impact drilling tools.
作者
雷宇奇
房伟
蔡晨光
杨高
于东兵
康凯
田家林
Lei Yuqi;Fang Wei;Cai Chenguang;Yang Gao;Yu Dongbing;Kang Kai;Tian Jialin(Jianghan Machinery Research Institute Limited Company of CNPC;Downhole Operation Branch,CNPC chuanqing Drilling Engineering Co.,Ltd.;Downhole services Branch of CNPC Bohai Drilling Engineering Company Limited;School of Mechanical Engineering,Southwest Petroleum University;Sichuan Xieming Technology Co.,Ltd.)
出处
《石油机械》
北大核心
2023年第5期25-32,共8页
China Petroleum Machinery
基金
中国石油集团工程技术研究院有限公司项目“连续管侧钻水平井关键工具”(二期)(CPET202109)。
关键词
PDC钻头
复合冲击
破岩比功
侵入深度
钻压
转速
PDC bit
composite impact
mechanical specific energy
penetration depth
weight on bit
rotation speed
