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论文类型：期刊论文

发表时间：2015-09-01

发表刊物：JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：26

页面范围：1254-1263

ISSN号：1875-5100

关键字：Process intensification; Dual-membrane module; Gas separation; Oil-field associated gas; Light hydrocarbon recovery

摘要：CO2 enhanced oil recovery technology is widely used in depleted oil-fields; however, the CO2 content in the associated gases is increased accordingly, which is unfavorable for both light hydrocarbon recovery and natural gas purification. This work proposes a dual-membrane associated gas recovery process, which couples hydrocarbon separation and CO2 removal in the dual-membrane modules and improves the process efficiency. The dual-membrane module contains both hydrocarbon-selective and CO2-selective membranes, enabling the hydrocarbons and CO2 to be recovered from bulk flow separately and simultaneously. The hydrocarbons are enriched in the permeate side of the hydrocarbon-selective membrane, and the permeate stream is re-pressurized for recovering valuable hydrocarbons. Meanwhile, CO2 is concentrated in the permeate side of CO2-selective membrane for enhanced oil recovery usage. The synergetic separation in the dual-membrane module significantly reduces the hydrocarbon loss while removing CO2, and results in higher hydrocarbon recovery than the single-membrane process or series-linked membrane process. The production cost savings of the dual-membrane module process are greater than 9%, because of the mutual promotion of hydrocarbon enrichment and CO2 removal by the dual-membrane module. (C) 2015 Published by Elsevier B.V.