隔热油管隔热层中支撑材料热力耦合特性分析

Analysis of Thermo-mechanical Coupling Characteristics of Supporting Materials in Insulating Layer of Insulating Oil Pipe

在稠油开采注蒸汽热采过程中,隔热油管可以有效减少井筒径向传热损失。实际生产中,隔热油管中的支撑材料(玻璃纤维)容易破损,导致散热损失增加,影响稠油热采效果。筛选更优质的支撑材料,增强隔热油管性能,有待深入研究。建立支撑材料多物理场耦合模型,针对玻璃纤维、碳纤维和复合玻璃纤维材料,进行了实际模拟计算;据此分析了支撑材料的温度、应力和位移变化特性。结果表明:随时间变化,复合玻璃纤维Mises应力最大、玻璃纤维次之、碳纤维最小,建议隔热管以复合玻璃纤维为支撑材料。研究结果为延长隔热油管使用寿命、提高稠油采收效果提供一定技术支撑。

In the process of steam injection thermal recovery in heavy oil recovery,insulated tubing can effectively reduce the radial heat transfer loss in the wellbore.In actual production,the supporting material(glass fiber)in the insulating oil pipe is damaged after being used for a period of time,resulting in increased heat loss and affecting the thermal recovery effect of heavy oil.It needs to be further studied to screen better supporting materials and enhance the performance of thermal insulation tubing.In this paper,the multi-physics field coupling model of the supporting material was established,and the actual simulation calculation was carried out for the glass fiber,carbon fiber and composite glass fiber materials.Based on this,the temperature,stress and displacement characteristics of the support material were analyzed.The results showed that the composite glass fiber Mises stress was the largest,the glass fiber was the second,and the carbon fiber was the smallest.It was recommended that the composite glass fiber should be used as the support material for the heat insulation pipe.This study provides some support for extending the service life of insulated tubing and improving the recovery effect of heavy oil.