西南石油大学学报（自然科学版）2016，Vol.38Issue(4)：149-156,8.DOI:10.11885/j.issn.1674-5086.2014.04.18.03
尾管固井过程中钻柱的动态摩阻力与变形研究
Research of Dynamic Frictional Drag and Deformation of Running Drill String in Liner Cementing
摘要
Abstract
This paper systematically studies the dynamic frictional drag and deformation of running drill string in liner cement-ing. The objective of the research is to evaluate the safety of the running drill string in liner cementing. At first,according to the structure size of drill string assembly and wellbore configuration size,the mechanical model of drill string under the fluid frictional drag was constructed,and the analytical mathematical model of the frictional drag and deformation of drill string caused by the flow of injected fluid in liner cementing was derived. And then,based on the structure size of drill string assem-bly and the fluid property of multi-densities and variable volume fluids in drill string,the analytical mathematical model of the depth of multi-densities fluid varying with the injecting time was deduced. Based on these mathematical models,the software, which evaluates the safety of the running drill string in liner cementing,was applied to well LG63 in Sichuan,and proved to be reliable and applicable. The research results indicate that under the action of the multi-densities fluid in the running drill string, the mathematical models and the software can find out the pumping fluid rate when the alternate load occurs in the running drill string,and optimize the parameters of safe operation of the running drill string. It provides a reliable means and approach for the safety evaluation of running drill string caused by the dynamic frictional drag and deformation string in liner cementing.关键词
尾管固井/送入钻柱/摩阻力/变形/数学模型Key words
liner cementing/running drill string/frictional drag/deformation/mathematical model分类
能源科技引用本文复制引用
练章华,郑建翔,张颖,石磊,牟凤英..尾管固井过程中钻柱的动态摩阻力与变形研究[J].西南石油大学学报（自然科学版）,2016,38(4):149-156,8.基金项目
国家自然科学基金（51574198）；国家教育部博士点基金（20135121110005）。 （）
