地层力学特性参数求解及其在苏里格地区的应用

Method of computing the mechanical parameters of formation and its application in Sulige area of Changqing Oilfield

为了能充分利用测井等资料较精确地计算井壁受力状态和井壁坍塌压力,以帮助设计合理钻井液密度窗,保证钻井过程中井壁的稳定,通过对井壁失稳问题深入的研究,结合测井资料和目前常用的经验公式,分析并建立了一套快速计算地层三压力及地层相关力学特征参数的方法和模型.对长庆油田苏里格苏4、苏6井测井资料的分析计算结果表明,地层三压力和地层力学特性参数的计算结果以及其可行的安全密度窗与现场实际情况吻合.所提出的方法和计算结果,将为苏里格气田开发过程中的安全快速钻井技术提供可靠的技术基础.

A set of models for calculating three formation pressure profiles (formation pore pressure, caving pressure and fracture pressure) and other formation mechanical parameters are established based on the study of borehole wall destabilization, logging data and ordinary empirical formulas. The calculated mechanical parameters can help us design the safe density limit of drilling fluid to make sure that the borehole wall is stable during drilling. The three pressure profiles and other formation mechanical parameters of Su-4 and Su-6 wells in Sulige area are calculated according to their logging data by using the set of models. The results are identical to the used data in field, which proves that the calculated three pressures, other mechanical parameters and the safe density limit of drilling fluid are reliable. The calculated results can provide a reliable technological basis for high-speed safe drilling in Sulige area.