南海莺琼地区高温高压钻井技术的探索

A STUDY OF THE DRILLING TECHNIQUES OF HIGH TEMPERATURE AND HIGH PRESSURE WELLS IN YING QIONG REGION OF SOUTH CHINA SEA

经过钻探证实，南海莺琼地区中深部地层同时存在着高温高压。实践也证明，高温高压在地层中的同时存在，比只是常温常压地层或者高温常压地层、常温高压地层，给钻井作业造成的困难和风险大得多。南海西部石油公司组织人员，针对南海莺琼地区高温高压井钻井作业中遇到的问题，对国内外高温高压井的作业情况开展考察、研究，对适合南海莺琼地区高温高压井钻井的技术，进行了初步的探索，并取得初步认识。文章主要是在介绍南海莺琼地区高温高压井钻井作业情况的基础上，对调研的成果，包括地层压力预测、套管结构、套管磨损与保护、井下复杂情况处理、适应高温高密度钻井液、固井、钻井设备与工具等进行了初步总结。

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.