Biot系数非线性解释初探及其在井壁稳定性分析中的应用

Preliminary study on non-liner interpretation of biot coefficient of rock and its application on the analysis of wellbore stability

李忠平 周文 谢润成 卲晶

LI Zhongping ZHOU Wen XIE Runcheng SHAO Jing

成都理工大学能源学院，四川成都　610059 中国石化西南油气分公司开发处，四川成都　610016 青海油田采油一厂，青海海西洲　816400

College of Energy Resource of Chengdu University of Technology, Chengdu 610059, China Field Development Department of Southwest Branch Sinopec, Chengdu 610016, China No.1 Oil Production Plant of QingHai Oil Field, Haixi 816400, China

Biot系数在钻井工程、压裂工程等方面具有重要应用价值，目前常用的测井解释Biot系数公式依赖于全波测井，推广性有限。考虑颗粒岩及结晶岩受力变形机制，在岩心试验测试结果的基础上，利用广义Usher模型建立起Biot系数解释方法。利用该模型，结合测井数据，计算得到单井岩石力学及地应力参数剖面，与实钻资料吻合情况良好，表明该Biot系数评价方法有一定的推广应用价值。

The Biot coefficient has an important application value on the drilling engineering fracturing engineering.The equation, which is used for the log interpretation of Biot coefficient, is dependent on all-wave logging,so its spread is limited. Based on the results of core tests,taking the deformation mechanism of grain-rock and chemical crystallized rock,the interpretation method for Biot coefficient is presented utilizing the broad sense Usher model, and the profiles of rock mechanics and in-situ stress parameters calculated by this model are coincident with the drilling data based on the log data. That means, this model is valuable for spreading application.