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《NATURAL GAS INDUSTRY》 1999-01
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A STUDY OF THE DRILLING TECHNIQUES OF HIGH TEMPERATURE AND HIGH PRESSURE WELLS IN YING QIONG REGION OF SOUTH CHINA SEA

Zhang Yong (Drilling Engineering Department of Nanhai West Corporation,CNOOC)  
It is proved by drilling that the high temperature and high pressure coexist in the medium and deep lying strata in the Ying Qiong region of South China Sea.Through practice it is shown that the difficulty and risk caused by high temperature and high pressure formation for drilling operation are much larger than those caused by normal temperature and normal pressure or high temperature and normal pressure or normal temperature and high pressure formation for the operation.In accordance with the problems encounting in drilling the high temperature and high pressure wells in the research region,the personnel of Nanhai West Corporation had investigated the operating conditions of drilling such wells at home and abroad and primarily found and approved some techniques for drilling such wells in the research region.On the basis of introduing the operating conditions of drilling such wells in the research region,the investigation results are primarily summarized in the paper,including the formation pressure predication,casing program,casing wear,casing protection and downhole complex condition treatment as well as the high density drilling fluid suitable for the high temperature condition and the equipment and tools of the drilling and cementing,etc.
【CateGory Index】: TE248
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