This paper presents the distribution and characteristics of the complex salt formation and its drilling technology in north area of Duns Pu Depression in Zhonsyuan oilfield. The author summarizes the drilling experiences of complex salt formation since 1976, considers the drilling technology of complex salt formation in Zhongyuan oilfield has been developed through three stages. Since entering into the third development stage in 1987, mud technology and drilling engineering for salt formation is becoming perfect, penetration rate is increased and sticking problem is eliminated.

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