中国石油大学学报（自然科学版）2016，Vol.40Issue(2)：76-82,7.DOI:10.3969/j.issn.1673-5005.2016.02.009
一修正设计系数的套管层次与下入深度设计方法
An improved casing design method and its application in deepwater drilling
摘要
Abstract
In conventional casing designs for oil and gas well drilling, all the design coefficients used for the determination of safe drilling fluid density window are defined by empirical evaluation or statistical methods, and a consistent value of each co-efficient is taken for all well sections. For drilling under complicated conditions, especially in deepwater drilling and at high temperature and high pressure ( HTHP) conditions or for ultra-deep wells, the safe drilling fluid density window required is much narrower, and the conventional casing design method is not appropriate. When the values of the design coefficients are taken too low, it may lead to less safe drilling conditions, but when they are too high, it can waste some safe drilling fluid window space, resulting unnecessary casing and drilling cost. In this paper, an improved casing design method was pro-posed, in which each design coefficient needed to be calculated and determined based on the well structure in order to opti-mize the safe drilling fluid density window. The new method has been applied for a case study of a deepwater well in west of Africa, and the results show that the wellbore size, depth and the drilling string size have significant influence on the deter-mination of the design coefficients'values.关键词
深水钻井/井身结构设计/设计系数/安全钻井液密度窗口/井涌允量Key words
deepwater drilling/casing design/design coefficient/safe drilling fluid density window/well kick tolerance分类
能源科技引用本文复制引用
柯珂,管志川,王志远,路保平..一修正设计系数的套管层次与下入深度设计方法[J].中国石油大学学报（自然科学版）,2016,40(2):76-82,7.基金项目
国家“973”课题(2010CB226706) （2010CB226706）
“十二五”国家重大专项(2011ZX05021-001) （2011ZX05021-001）
国家自然科学基金项目(51104113) （51104113）
中国石化集团公司科技攻关课题(P13010) （P13010）
