岩石力学参数求取方法进展

Advances in Calculation Methods for Rock Mechanics Parameters

准确求取岩石力学参数对于制定完善的钻井、完井与油气开发方案和技术措施,降低作业风险具有重要的作用。介绍了两种求取岩石力学参数的方法,即实验室试验法和测井资料法,其中由于测井资料的获取相对容易, 且表征地层的信息连续,因而得到了广泛应用,给出了利用测井资料求取岩石弹性参数和强度参数的基本公式,对钻井与开采过程中由于泥页岩水化和岩石环境的改变对岩石力学参数的影响进行了详细的分析,找出了其变化规律,并给出了相应的求取岩石力学参数的数学模型,丰富和完善了岩石力学参数求取方法,指出在求取地层坍塌压力、地应力等参数及制定技术措施和技术方案时,应当应用当时地层条件下的岩石力学参数值。

Accurately acquiring rock mechanics parameters pays an important role in designing perfect drilling, completion and production programs, taking proper technical measures and lowering operating risks. This paper introduces two methods based on lab tests and logging data respectively.The logging method has been used widely because of its comparatively handy logging data and continuous geological information. The paper presents the basic formula used to calculate rock elastic variables and strength parameters with logging data,analyzes effects of shale hydration and rock circumstance variations on rock mechanics,and finds out how the effects develop, gives a model of calculating rock mechanics parameters,which enriches and betters the methods for determining rock mechanics. Moreover,the article proposes that real-time rock mechanics variables should be preferred to determine formation sloughing pressure and in-situ stress and figure out technical measures.