稠油热采井防砂筛管失效机理及完整性研究

目的 防止热采井筛管损坏,延长热采井防砂有效期.方法 基于有限元理论,分别针对基管和外保护套,开展热采井优质防砂筛管在不同热应力补偿器及其安放间隔条件下的完整性研究,并开展室内实验,探究筛管在腐蚀、冲蚀共同影响下的失效规律.结果 目前现场所使用的热应力补偿器设计基本满足防砂筛管基管的力学完整性需求,但无法保证外保护套的...

Failure Mechanism and Integrity of Sand Control Screen in HeavyOil Thermal Production Well

This paper aims to prevent screen damage in thermal production well and extend the validity of sand control.Based on the finite element theory,this paper studies the integrity of high quality mesh screen for thermal production well in the condition of thermal stress compensators with different quantity and spaces respectively focusing on central base pipe and outer protective cover,and the laboratory experiments are conducted to explore the failure law of the screen under the influence of corrosion and erosion.The result shows that current arrangement of thermal stress compensator fulfils requirements of mechanical integrity of central base pipe of sand control screen,while the mechanical integrity of the outer protective cover cannot be guaranteed,and screen damage cannot be avoided.It is recommended that the stress state and deformation of the outer protective cover should be fully considered in the design of the thermal stress compensator.High velocity fluid has no destructive effect on the screen,but it has erosion damage on the corrosion product film in the environment of erosion-corrosion.The condition of erosion-corrosion superposition is the main factor of erosion damage.Reasonable allocation of thermal stress compensators and material selection of screen are conducive to improving the integrity of screen and prolonging the effective period of sand control.