中国石油大学学报（自然科学版）Issue(6)：72-77,6.DOI:10.3969/j.issn.1673-5005.2014.06.011
基于含可信度地层压力剖面的精细井身结构设计方法
Methods for precise casing design based on formation pressure profiles with different credibility
摘要
Abstract
The constraints of the safe density window in the existing casing design program for deep well drilling were ana-lyzed. It is found that the values taken for the empirical safety factors, such as kick tolerance, fracture pressure coefficient and swabbing pressure factor, are relatively conservative, and there is no constraint considering the loss during well circula-tion operations, which is a weak point for deep well drilling, especially for the wells with narrow safe density window in the lower stratum. A method to accurately determine the upper and lower limits of the safe density window was proposed consider-ing the formation pressure profiles with different credibility, additional drilling fluid density and swabbing pressure, and a constraint considering the loss during well circulation operations was also added in the calculation program. Thus, a new method for precise casing design for deep wells was established, which can be based on formation pressure profiles with dif-ferent credibility, and simplify the calculation of the annulus pressure loss and can avoid the loss problems during well circu-lation operations. The new method can effectively control and reduce the risks caused by irrational fluid density during casing design of deep wells.关键词
深井/窄安全密度窗口/井身结构设计/地层压力/环空压耗Key words
deep well drilling/narrow safe density window/casing design/formation pressure/annulus pressure loss分类
能源科技引用本文复制引用
许玉强,管志川,张洪宁,张会增..基于含可信度地层压力剖面的精细井身结构设计方法[J].中国石油大学学报（自然科学版）,2014,(6):72-77,6.基金项目
国家“973”重点基础研究发展计划(2010CB226706) （2010CB226706）
中国石油大学研究生创新基金项目(CX2013011) （CX2013011）
国家“863”高技术研究发展计划(2012AA091501) （2012AA091501）
