综合考虑成本和钻速的PDC钻头钻进参数优化设计

摘要

传统的钻进参数优化模型不适用于PDC钻头.针对传统模型的不足,在牙轮钻头钻进参数优化理论的基础上,引入钻井成本和钻速权重系数,结合PDC钻头钻速方程、磨损方程和钻速随累积进尺的变化规律等基本方程,建立了钻井成本和钻速双目标约束下的PDC钻头钻进参数优化模型.该模型可根据降低成本或提速的具体目标设置钻井成本系数和钻速系数,在同时考虑成本和钻速的条件下对钻进参数进行优化设计.川西新场地区实钻资料的计算结果显示,经过参数优化后PDC钻头的单位进尺成本降低,同时钻速提高,这表明该模型可以用于双目标下PDC钻头钻进参数的优化设计.%In order to make up the shortage of traditional drilling parameter optimization model that can't apply to PDC bits,based on the roller cone bit drilling parameter optimization theory,this paper in-troduced the parameters of drilling cost and drilling speed. Combined with PDC bit drilling rate equation, wear equation and variation of drilling rate with the cumulative footage, the dual-goal PDC bit drilling pa-rameter optimization model was built taking drilling rate and cost into account. This model can set drilling cost coefficient and drilling rate coefficient according to the specific objectives of cost reduction or speed in-crease, optimize and design the drilling parameters taking into account the costs and drilling rate. The cal-culation of drilling data in Xinchang site in western area of Sichuan verified the validity of the model,which indicated that this modal could be used for PDC bit drilling parameter optimization design with the dual goals.