第38参第5期 2016年9月
石油钻采工艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号：10007393(2016)05-0545-08
DOI: 10.13639/j.odpt.2016.05.001
焦石坝页岩气储层水平井井壁失稳机理
崔云海，刘厚彬？杨海平1马天寿？
1.中石化江汉石沟工程有限公司；2.西南石油大学油气藏地质及开发工程国家重点实检室
Vol.38 No.5 Sept. 2016
引用格式：崔云海，刘厚彬，杨海平，马天寿，焦石坝页岩气储层水平并并整失稳机理【J，，石油钻采工艺，2016,385)： 545-552.
焦石坝区块页气储层岩石层理发育，导致页岩强度各向并性特征明显，钻并过程中易发生井壁失稳问题。为此，
摘要：
采用龙马溪组井下岩心开展直接剪切和三轴实验，结合单组弱面强度理论，建立了页岩强度各向并性表征方法；综合页岩强度各向异性表征方法、并壁应力分布模型，建立了页岩并壁竭压力计算方法；最后，以目标井JY1HF并为例进行了实例计算与分新。结果表明：龙马溪组页岩发育了大量软弱层理，沿软弱层理剪切清移是并壁失稳的主要力学机制；钻并液漫泡后页岩强度出现劣化，但强度劣化效应并不十分显著；常规模型计算的毋娟压力随着井斜角增加而减小，文中模型计算的辑压力随着并斜角先增加后减小，且计算结果与实际情况更加吻合；页岩薄弱层理的剪切滑移是井斜并段并壁拷娟的关键，而强度的穷化并不是主控图素。研究结累可为石填区块和其他地区页岩气并钻并设计、执述优化等提供参考
关键词：页岩气；并壁稳定；丹塌压力；各向异性；层理面；焦石坝区块
中国分类号：TE21
文献标识码：A
Mechanisms of sidewall stability loss in horizontal wells drilledforshalegasdevelopmentinJiaoshibaBlock
CUI Yunhai', LIU Houbin', YANG Haiping', MA Tianshou
1. SINOPEC Jianghan Petrolerm Engineering Co. Ltd, Qianjiang, Hubei 433124, China;
2. Stafe Key Laborafory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petrolem University, Chengdir, Sichuan 610500, Ching Citation: CUI Yunhai, LIU Houbin, YANG Haiping, MA Tianshou. Mechanisms of sidewall stability loss in horizontal wells
drilled for shale gas development in Jiaoshiba Block [ J J . Oil Drilling & Production Technology, 2016, 38(5): 545-552
Abstract: With beddings well developed, shale gas reservoirs in Jiaoshiba Block are characterized by high strength anisotrophy, so loss of sidewall stability is frequent in these reservoirs. Therefore, direct shearing and triaxial tests were performed on core samples taken from the Longmaxi Formation to develop a new way to characterize shale strength anisotropy based on single-group weak-plane strength theory. By combining the shale strength anisotropy characterization method and model of stress distribution on sidewall, a calculation method of sidewall collapsing pressure in shale formations has been worked out. Finally, calculation and analysis have been done with Well JY1HF as an example. The calculation results show that, with large amounts of weak bedding, shale in the Longmaxi Formation shows apparent anisotropy, and shearing slippage along weak bedding is the main mechanism of sidewall stability loss. Strength of the shale soaked in drilling fluid turns weaker, but such strength reduction is not significant; collapsing pressure calcualted by using conven-
基金项目：国家白然科学青年基资助项目"泥页常黏主矿物表面电化学反应及常体断账数值模拟研究"（编号：51204142)；国家重第一作若：准云海（1965-)，1985年率业于西南石油争院开发钻并工程专业，2010年毕业于中国石油大学（北亨）石油与天然气工程，
获工程硕士季位，现从事钻并技术管理、石油工程技术科研和推广应用工作，高级工程师。电语：0728-6581626。E-mail： zjcyh2005@sohu.com
通讯作者：刘厚彬（1980-),从事案石力学与沟气并并墅稳定、钻并提速方面的研究与教学工作。通试地址：(610500)四川省都市新都
区新都大道8号油气藏地质与开发工程国家重点实验宝。电话；028-83032459。E-mail：liuhoubin523@sina.com
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