Doubles twists twisting when can realize yarn twisting four number of twists, yarn tensity small, the production efficiency is high, can enhance Cheng Sha the output quality;

倍捻加捻时能实现纱线加捻四个捻度，纱线张力小，生产效率高，能提高成纱的产量质量；

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Types of reservoir rocks in Sha 3 formation of fault block Cheng 913 in Chengdong oilfield are classified on basis of well point analysis by using data of nuclear magnetic resonance;

以井点分析为基础，利用核磁共振测井等资料，对埕东油田埕913断决沙三段储层岩石进行分类；

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