石油钻采工艺2011，Vol.33Issue(6)：1-4,4.
深水钻井井壁稳定性评估技术及其应用
Evaluation and application of wellbore stability in deep water
摘要
Abstract
The deep water formation has low overburden pressure, low fracture pressure and narrow safety window of mud density. So the risk of wellbore instability is very high in this kind of formation. It is significantly important to accurately evaluate the safety window of mud density. The difficulties of wellbore stability analysis in deep water are how to accurately predicate the overburden pressure and establish the calculation model of caving and fracture pressure in the shallow part of the deep water formation. The published foreign models, for calculating the overburden pressure in the shallow part of the deep water formation, have precision problems in density evaluation. In this paper, we begin from the properties of deepwater formation, and suggest that different models should be used according to the different diagenetic stages in the shallow and deep part of the deep water formation.The wellbore stability is researched for shallow and deep parts separately, and different models are obtained. The model is used to evaluate the safety window of mud density in a deep water gas field in South China Sea. The result is coincide with the really drilling condition, which indicates the model is accurate and reliable and can supply useful information for mud density design in deep water drilling.关键词
深水/井壁稳定/上覆岩层压力/破裂压力/坍塌压力Key words
deep water/wellbore stability/overburden pressure/fracture pressure/collapse pressure分类
能源科技引用本文复制引用
蔚宝华,闫传梁,邓金根,刘书杰,谭强,肖坤..深水钻井井壁稳定性评估技术及其应用[J].石油钻采工艺,2011,33(6):1-4,4.基金项目
国家科技重大专项项目"南海深水油气勘探开发示范工程"(编号:2008ZX05056-002-03-02) （编号:2008ZX05056-002-03-02）
中国石油大学(北京)引进人才科研启动基金 （北京）
"深水钻井井壁稳定性理论与实验研究"(编号:QD-2010-09)联合资助. （编号:QD-2010-09）
