摘要
油气井钻进过程中,水敏粘土矿物是泥页岩发生水化失稳的主要因素。依据粘土矿物各组分对粘土矿物的放射性贡献不同,在对西部某油田志留系泥页岩岩屑进行X射线衍射分析的基础上,利用多元非线性回归方法确定了粘土矿物组分与伽马能谱的关系。结果表明:利用该模型可方便、准确地确定研究井所在地层水敏粘土矿物组分的分布情况,且该井的钻井液使用情况可用来指导邻井对应地层钻井液体系的优选,防止了井壁水化失稳,有效保护了储层。
During oil and gas drilling, water sensitivity clay mineral is the main factor of the mud shale hydration. The clay mineral components of mud shale detritus taken from Silurian formation of the western oilfield were determined with X-ray diffraction. According to the theory that type and content of radioactive nuclides are different among all parts of clay mineral, the relation between the clay mineral components and gamma spectrometry was established. The resuhs show that the contents of clay mineral components in the main formation of study well can be conveniently and exactly calculated by this model. Refering to the result of the drilling fluid used in study well, the drilling fluid performance used in water sensitivity formation of neighbor well can be optimized. The borehole hydration instability is successfully avoided, and the reservoir is effectively protected by using optimized drilling fluid.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期58-62,共5页
Journal of China University of Petroleum(Edition of Natural Science)
关键词
伽马能谱
粘土矿物
钻井液性能
井壁坍塌
储层保护
gamma spectrometry
clay mineral
drilling fluid performance
borehole collapse
reservoir protection
