确定泥页岩粘土矿物组分的新方法及对钻井液性能的优化

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。

New method of determining clay mineral components of mud shale and optimization of drilling fluid performance

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 results show that the contents of clay mineral component...