油层套管内压力变化与水泥石压力变化的相关性

CORRELATIVITY OF PRESSURE CHANGE IN PRODUCTION CASING AND CEMENTSTONE

在油气井中,油层套管内压力变化是最普遍、最常见的一种现象。油层套管内的压力变化不仅会引起油层套管发生变形和受力变化,还会引起水泥石和技术套管发生变形和受力变化。掌握了油层套管内压力变化和水泥石内外侧压力变化的相关规律,就能掌握油层套管、水泥石的载荷变化情况,从而有效地对油层套管、水泥石进行安全分析,并提出更为有效的油层套管保护措施。文章着重研究油层套管+水泥石+地层体系中油层套管内压力变化与水泥石压力变化相关规律,同时给出一些算例供读者参考,然后介绍油层套管+水泥石+技术套管+地层体系的一些求解处理方法,最后介绍水泥石内外侧压力变化值的应用。

It is a most popular and common occurrence that pressure changes in production casing. It not only results in shape-distortion of production casing, but also of cement stone and protective casing. After grasping the related principle of pressure variation in production casing and inside and outside lateral pressure changes of cement stone, load variety of production casing and cement stone can be grasped, and then security analysis for production casing and cement stone can be performed effectively, furthermore the protecting measures of production casing will be formed. This paper researched the correlative rules of pressure changes in production casing and cement stone in the system of production casing and cement stone and payzone, introduced some calculation methods for the system, and gave applications of inside and outside pressure changes value of cement stone.