One of the main problems encountered in the course of high pressure gas injection in the miscible flood oilfield is the free from setting of packer and the permanent deforming of pipe string.

• 封隔器解封和管柱永久变形是混相驱油田高压注气过程中遇到的重要问题之一。高压注气作业过程中温度和压力的剧烈变化引起管柱伸缩或受力变化,其主要影响因素有:温度变化引起的温膨效应;