Feasibility Study on Downhole Gas-Liquid Separator Design and Experiment Based on the Phase Isolation Method
APPLIED SCIENCES-BASEL(2021)
摘要
As oil exploitation enters its middle and late stages, formation pressure drops, and crude oil degases. In production profile logging, the presence of the gas phase will affect the initial oil-water two-phase flowmeter's flow measurement results. In order to eliminate gas-phase interference and reduce measurement costs, we designed a downhole gas-liquid separator (DGLS) suitable for low flow, high water holdup, and high gas holdup. We based it on the phase isolation method. Using a combination of numerical simulation and fluid dynamic measurement experiments, we studied DGLS separation efficiency separately in the two cases of gas-water two-phase flow and oil-gas-water three-phase flow. Comparative analysis of the numerical simulation calculation and dynamic test results showed that: the VOF model constructed based on k-epsilon the equation is nearly identical to the dynamic test, and can be used to analyze DGLS separation efficiency; the numerical simulation results of the gas-water two-phase flow show that when the total flow rate is below 20 m(3)/d, the separation efficiency surpasses 90%. The oil-gas-water three-phase's numerical simulation results show that the oil phase influences separation efficiency. When the total flow rate is 20 m(3)/d-50 m(3)/d and gas holdup is low, the DGLS's separation efficiency can exceed 90%. Our experimental study on fluid dynamics measurement shows that the DGLS's applicable range is when the gas mass is 0 m(3)/d~15 m(3)/d, and the water holdup range is 50%~100%. The research presented in this article can provide a theoretical basis for the development and design of DGLSs.
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关键词
downhole gas-liquid separator (DGLS), gas-water two-phase flow, multiphase flow, separation efficiency
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