中国石油大学学报（自然科学版）2017，Vol.41Issue(4)：85-90,6.DOI:10.3969/j.issn.1673-5005.2017.04.011
提拉-释放法套管下入机理
Mechanism analysis of pull-up and quick release technique during casing running process
摘要
Abstract
In order to solve a suck-up problem during casing running process in well completion, the most frequently used and accessible method is the pull-up and then quick release technique. However, its application is mainly based on experi-ence, and lack of mechanism analysis and theoretical guidance. In essence, the motion of the casing string in a section of horizontal well after a pull-up and then quick release is similar to that in an actual wellbore, and thus an analysis model for the mechanism of casing running during the pull-up then release process was established, and corresponding programs were coded. The influences of many factors on the trip-in ability of the casing have been analyzed, including the casing length, friction coefficient, axial pressure, dimensionless tensile force and different release ways. The results indicate that casing running during the pull-up and then release can make use of the stress wave produced in the process to reduce friction, which can push the casing to move forward even though the original axial compression force is less than the total friction. The length of the casing and the friction coefficient are negatively correlated to the axial movement of the casing, while the axial pressure and dimensionless tensile force are positively correlated to the axial displacement during the pull-up and then release process. Meanwhile, the axial movement of the casing in a rapid release process is much larger than that in a slow release process.关键词
套管下入/提拉-释放法/摩阻/应力波/影响因素Key words
casing running/pull-up and then release method/friction/stress wave/influence factors分类
能源科技引用本文复制引用
黄根炉,李伟,倪红坚,孟祥伟,于凡,王书超..提拉-释放法套管下入机理[J].中国石油大学学报（自然科学版）,2017,41(4):85-90,6.基金项目
国家自然科学基金项目(51274234) （51274234）
