马鞍塘组裂缝性灰岩地层井壁稳定性研究  

Research on wellbore stability for fractured limestone of Ma’antang Formation

作　　者：刘厚彬[1] 崔帅 孟英峰[1] 邓虎[2] 王佳珺 韩正波 LIU Houbin;CUI Shuai;MENG Yingfeng;DENG Hu;WANG Jiajun;HAN Zhengbo(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuang 610500,China;CCDC Drilling&Production Engineering Technology Research Institute,Guanghan,Sichuan 618300,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]川庆钻探工程有限公司钻采工程技术研究院,四川广汉618300

出　　处：《中国海上油气》2021年第2期156-163,共8页China Offshore Oil and Gas

基　　金：国家自然科学基金项目“气体钻井技术基础研究(编号:51134004)”部分研究成果。

摘　　要：马鞍塘组裂缝性灰岩地层的岩石力学特性是影响该地层井壁稳定性问题的重要因素。通过室内三轴力学实验,研究了马鞍塘组灰岩的岩石力学特性,分析了井壁渗流能力及井筒与地层间不同渗流情况的应力场变化规律。研究结果表明,马鞍塘组灰岩的岩石力学特性随取心角度的增加呈先上升后下降再上升的趋势,而钻井液浸泡效应对其影响不明显;裂缝走向与井壁径向平行时的井壁渗流能力最大,考虑渗流场和裂缝弱面效应的井壁稳定性较差。本文研究可以为现场钻井施工方案的优化设计提供一定的理论支撑。The rock mechanical properties of fractured limestone of Ma’antang Formation is an important factor that affects the wellbore stability of the formation.Through indoor tri-axial mechanics experiments,the rock mechanical properties of the limestone of Ma’antang Formation were studied,and the seepage capacity of the wellbore wall and the stress field change law between the wellbore and the formation under different seepage conditions were analyzed.The research results indicate that the rock mechanical properties of limestone of Ma’antang Formation show a rise-fall-rise trend with the increase of the coring angle,while the drilling fluid soaking effect has not obvious influence on it;when the fracture direction is parallel to the radial direction of the wellbore wall,the wellbore wall has the largest seepage capacity,and the wellbore wall stability considering the seepage field and the weak-plane effects of fractures is poor.The research in this paper can provide certain theoretical supports for the optimization design of on-site drilling construction scheme.

关 键 词：马鞍塘组 灰岩 裂缝 井壁稳定性 应力场 弱面效应 

分 类 号：TE21[石油与天然气工程—油气井工程]