摘要
井漏问题给石油工程界带来极大挑战,尤其是深井钻井作业过程中遇到应力敏感裂缝性地层时,由于地层压力变化异常,裂缝形态复杂多样,钻井液漏失问题更加突出。采用模拟地层条件下的岩心浸泡实验和常规岩石力学实验,测试了裂缝性碳酸盐岩地层经过堵漏浆浸泡作用后的岩石力学强度参数,分析了裂缝性碳酸盐岩岩心的强度弱化效应和封堵机理。在考虑裂缝和孔隙结构特征造成的应力敏感行为差异的基础上,通过对现场实例计算,定量分析和讨论了应力敏感裂缝性地层的漏失规律,为应力敏感裂缝性地层的堵漏机理研究提供了理论依据。
The lost circulation problem often brings about great challenges to petroleum engineering sector, especially in the case of en-countering fractured strata with stress-sensitivity while drilling deep wells. By means of core soaking experiment and conventional rock me-chanics experiment under simulated formation conditions, this paper tests the rock mechanics parameters of fractured carbonate rocks aftersoaked by plugging slurry, and analyzes the samples＇ mechanics strength weakening effect and plugging mechanism. Considering the stress-sensitivity differences caused by the fracture and pore structure characteristics, this paper quantitatively analyzes and discusses the lostcirculation law of such a formation, providing a theoretical basis for the plugging mechanism study of stress-sensitivity fractured strata.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2015年第4期450-453,共4页
Xinjiang Petroleum Geology
基金
国家自然科学基金(71373003)
关键词
应力敏感性地层
裂缝性地层
漏失规律
堵漏效果
stress-sensitivity formation
fractured formation
lost circulation law
plugging effect
