影响高压注气管柱变形的主要因素及计算方法

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;压力变化引起的膨径、活塞和螺旋弯曲效应。在前人研究的基础上给出了复合管柱的各种计算模型。初始力是预防管柱损坏的可操作性重要因素,它和管柱各种受力及应力之间有密切关系,对此做了定量分析。研究结果对矿场作业具有一定指导意义。

MAIN FACTORS OF CAUSING HIGH PRESSURE GAS INJECTION PIPE STRING DEFORM AND THE CALCULATION METHOD

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. During the high pressure gas injection, the exquisite variation of the temperature and pressure causes the pipe string flexing or results in the change of force exerted on it. This paper presents the main influential factors: swelling effect caused by the variation of temperature; the effect of diameter swelling, plunger and spiral bending caused by the variation of pressure; and the influence of the initial force. This paper presents models for calculating the complex pipe string based on previous study. This paper points out that the initial force is the important operable factors for preventing the pipe string from damaging, and it is closely related to the force and stress exerted on the pipe string.