Structure Performance Of Precision Compound Sand Control Screen Analysis And Optimization

In the process of oil exploitation, sand production is the common problem inloose sand reservoir. Sand control screen, as a kind of important sand control of oilproduction equipment, is widely used in oil drilling industry, especially in verticalwells, horizontal wells, the lateral branch drilling wells, et al. Precision compoundsand control screen is a kind of sand control screens, which shows sand control withhigh precision performance. Underground environment precision compound sandcontrol screen faces is very complex, which often leads to structure damage caused bya lack of structure strength. Role of external protecting tube is to guide the flow ofsand oil in order to reduce oil sand erosion and wear of the internal sand filter layer.As the external protecting tube is often directly corroded by sand oil, easy to causeerosion damage and affect the service life. Therefore, the research on the structuralstrength of precision compound sand control screen and external protecting tubeerosion performance is of great significance.In this paper, by using the method of FEM and experimental research, thestructure performance analysis of precision compound sand control screen was done.For the structure strength performance of precision compound sand control screen,ANSYS was used to analyze content below, the vertical borehole strength, horizontalbending strength, parametric optimization of base tube outer pressure strength.Critical load was obtained when facing vertical borehole trendy clogging situation,along with the optimal material of external protection pipe and the optimal size ofpipe seam space; The relationship between diameter-thick ratio and the radialdeformation, equivalent stress and shear stress was gained through the bendingsection of horizontal well, and according to such relationship, the selecting principlesof diameter-thick ratio were summarized; Through the parametric ANSYS analysis ofbase tube outer pressure, the relationship of the base tube aperture parameters andhole density with base tube structure strength was gotten, and reference suggestionswere provided for based design of tube hole size. For erosion wear performance, through the use of fluent dynamic ANSYSsoftware CFX, based on solid-liquid two-phase flow simulation analysis of externalprotecting tube seam, the external protecting tube seam place where maximum valueof erosion wear rate exits was found, and the relationship of external protecting tubeerosion wear rate and erosion wear factors was obtained, including the analysis ofthe erosion speed, sand grain diameter and sand mass fraction leading to structurechanges of erosion wear rate. With the use of jet erosion experiment, erosion wearperformance of the external protecting tube commonly made of material316Lstainless steel and304stainless steel was analyzed. In view of the erosion wearsurface behavior, scouring corrosion and the critical speed of erosion wear, theerosion wear performance of external protecting tube material was analyzed, gettingthe result that the erosion performance of316L stainless steel is better than304stainless steel erosion performance.