西南石油大学学报（自然科学版）2011，Vol.33Issue(6)：105-108,4.DOI:10.3863/j.issn.1674-5086.2011.06.020
管内压力变化速率对套管强度的影响规律研究
王国华 1熊继有 1薛亮 2陈正茂 1许红林1
作者信息
- 1. “油气藏地质及开发工程”国家重点实验室·西南石油大学,四川成都610500
- 2. 中海石油深圳分公司CACT作业者集团,广东深圳518069
- 折叠
摘要
Abstract
Based on the analysis about comprehensive situations of drill pipe blocking interval of three typical wells in an oil field, a common characteristic of casing strength problem in three wells has been found that after salt and gypsum layers are drilled and cemented, there is a need for reducing the density of drilling fluid to drill the under stable strata, when the density decreases to a certain value the elastic deformation of the casing occurs, leading to some difficulties for the bit to pass through the casing. Consequently, it is necessary to consider the influence of the drilling fluid density decrease on the casing deformation. The finite element analysis model of the inner pressure variation rate of the casing influencing on the casing is established and some relevant analytical research by the model is presented in the paper. Results show that the stress increasing rate of the representative unit is faster along with the quicker variation rate of the pressure and the maximum value of that is bigger, reducing the variation rate of the inner pressure can effectively reduce the stress value of the casing. That is to say, prolonging the time of density replacement benefits casing strength and preventing casing deformation.关键词
管内压力变化速率/钻井液密度/数值模拟/套管强度/蠕变地层Key words
inner pressure variation rate/ drilling fluid density/ numerical simulation/ casing strength/ creep formation分类
能源科技引用本文复制引用
王国华,熊继有,薛亮,陈正茂,许红林..管内压力变化速率对套管强度的影响规律研究[J].西南石油大学学报（自然科学版）,2011,33(6):105-108,4.
