Residual Strength Analysis of ThreResidual Three-phase Separator Containing Corrosion Defects in Service

摘要

Three-phase separator, for separating oil, gas, water three-phase and solid phase, is widelyused in oil field development and production process. Since the long-term effects of oil andgas in an aqueous medium, the inside of the three-phase separator usually corrodes, thus,reduce its loading capacity and its service life, and endanger the safety of equipment andoil and gas production system. Based on, the paper set up a simulation model of the threephaseseparator containing the problem of corrosion defects, and made model analysis onthe residual intensity of the three-phase separator containing corrosion defects. Analysedthe impact of position and geometry on the residual intensity of the three-phase separator.The result as follows: plastic deformation of the cylinder corrosion defects region primarilyoccurs at the axial edges of the defect. As the defect length, width, depth enlarged, theseparator failure occurs earlier, among which the depth of defects impact greatest on thefailure pressure. Plastic deformation of the corrosion defects head region occurs first in thecentre of the defect, and extends to the surrounding. The larger the depth and crosssectionalarea of the defect is, the sooner separator failure occurs, wherein the depth ofdefects impact greatest on the failure pressure. The impact of the head defects overpassedthat of the cylinder defects on the residual intensity of the three-phase separator.