Methods of preparation of a oil field drilling mud water - loss control additive with waste PAN fiber hydrolyzed at high pressure had been studied and had tested its properties.

研究了用废腈纶经高压釜中水解制备油田钻井泥浆降失水剂的方法，并进行了性能试验。

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The method of building salt pan is that mud, sand and salt are pounded into pieces and mixed and pressed well. In which the content of salt may reach 40%.

盐田修建方法为粘土、沙、盐三种物料尽量弄碎并混合均匀、压实，含盐量最高可达40%。

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