Long core interval drilling technology in the Zhenjia1 Well. (English)

ZhenJia 1 Well is the deployment of the Chinese Academy of Geological Sciences sylvite key well for investigation and evaluation of sylvite in the Ordovician salt basin of Northern Shaanxi resources. Through analyzes construction difficulty of the well during drilling, the type selection of core bit and coring tools, coring parameter optimize, prevention of accidents and complex were researched. According to such problems as vertical section Liu Jia Gou formation leakage, core interval longer, reamed of core interval, salt core dissolved, salt bed shrink hole, systematic reasonable technical measures are established. The coring footage is 900.4 m in the well, the salt coring footage is 177.06 m.,and the Core number of trips is 53. The core recovery is 98.48%. ZhenJia 1 Well provides an important experience for constructing of the same type well. [ABSTRACT FROM AUTHOR]

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