摘要
为满足优质高速钻井的要求,需要对岩石可钻性做出更加精确的观测.利用分形几何理论,研究了钻井过程中岩石破碎机理及形成过程,提出了一种以井底返出的岩屑为对象的岩石可钻性测试方法.在室内实验基础上,确定了不同井深岩石破碎后的块度分布函数,计算了岩石破碎的分形维数,其分形维数的相关性因数在0.90以上.分析结果表明:岩石硬度和牙轮微钻头可钻性级值与上返岩屑块度分维具有良好的相关性;用上返岩屑分布分形维数确定岩石可钻性方法简单易行,可在钻进过程中不间断取样,其理论意义和应用价值重大.
In order to satisfy the request of high quality and high speed drilling,it is necessary to make a more precise observation of the rock drillability.With the fractal geometry theory,this paper puts forward a new rock drillability testing method by selecting detritus from bottom hole as object.The fractal mechanism and forming process of rock broken is investigated.The broken fragment distribution function of rock in different well depth is determined based on laboratory experiment.Broken fractal dimension of rock is calculated.Relativity coefficient of fractal dimension is upward to 0.90,The correlativity between rock rigidity,cone micro-bit drillability value and fragment fractal distribution of upward cuttings is excellent.It's easy and feasible to determine the rock drillability with the fractal dimension of the upward debris,and can continue sampling in drilling process.So its theoretical significance and the application value are significant.
出处
《大庆石油学院学报》
CAS
北大核心
2006年第3期24-26,共3页
Journal of Daqing Petroleum Institute
基金
国家自然科学基金资助项目(50474093)
关键词
钻井
岩石可钻性
分形
岩石力学性质
drilling
rock drillability
fractal
rock mechanical property
作者简介
李士斌（1965-）男。博士生，副教授，主要从事岩石破碎机理和钻井工艺方面的研究．
