NDLI: Feasibility Study on Downhole Gas–Liquid Separator Design and Experiment Based on the Phase Isolation Method

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Feasibility Study on Downhole Gas–Liquid Separator Design and Experiment Based on the Phase Isolation Method

Content Provider	MDPI
Author	Yang, Yuntong Jiang, Zhaoyu Han, Lianfu Liu, Wancun Liu, Xingbin Deng, Gang
Copyright Year	2021
Description	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 $k-ε$ 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.
Starting Page	10496
e-ISSN	20763417
DOI	10.3390/app112110496
Journal	Applied Sciences
Issue Number	21
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-11-08
Access Restriction	Open
Subject Keyword	Applied Sciences Petroleum Engineering Downhole Gas–liquid Separator (dgls) Gas–water Two-phase Flow Multiphase Flow Separation Efficiency
Content Type	Text
Resource Type	Article

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