大庆石油地质与开发2018，Vol.37Issue(2)：102-107,6.DOI:10.19597/J.ISSN.1000-3754.201705053
基于弹性应变能强度准则评价井壁稳定性
WELLBORE STABILITY EVALUATION BASED ON THE ENERGY STRENGTH CRITERION OF THE ELASTIC STRAIN
摘要
Abstract
Rock strength criterion is the important basic theory in petroleum engineering,especially in the study of the wellbore stability.But comparing with the field fact,there is a larger error between the obtained results by the rock strength criterion of the classical elastoplastic theory regarded as the judging evidence of the wellbore stability failure.Therefore,the triaxial mechanic test was performed to get the limiting store energy of the rocks under different peripheral pressures,the energy strength criterion was established from the viewpoint of the energy,and moreover comparing with the other strength criteria,the wellbore stability was analyzed.The calculated results show that there are much bigger differences among the achieved collapse pressures by different strength criteria:in detail,the obtained collapse pressure by Hoek-Brown criterion is rather lower and furthermore it may cause the wellbore unstable;while those by Mohr-Coulomb and Drucker-Prager criteria are so conservative and the strata may be fractured;the collapse pressure obtained by the energy strength criterion can not only prevent the wellbore not-to-be-collapsed,but also prevent the wellbore not-to-be-leaked,so the criterion can be regarded as the new evaluating method of the wellbore stability and provide the reliable theoretical evidence for the density design of the drilling liquid.关键词
岩石力学/井壁稳定性/强度准则/坍塌压力/钻井液密度设计Key words
rock mechanics/wellbore stability/strength criterion/collapse pressure/drilling-liquid density design分类
能源科技引用本文复制引用
曾韦,梁利喜,刘向君..基于弹性应变能强度准则评价井壁稳定性[J].大庆石油地质与开发,2018,37(2):102-107,6.基金项目
国家科技重大专项“大型油气田及煤层气开发”(2016ZX05051) （2016ZX05051）
国家科技重大专项“复杂结构煤层改造地质力学环境特征及精细描述”(2016ZX05044-004-001). （2016ZX05044-004-001）
