化工学报 ›› 2023, Vol. 74 ›› Issue (5): 2034-2045.DOI: 10.11949/0438-1157.20221611

• 分离工程 • 上一篇    下一篇

面向含氮油田伴生气提质利用的膜耦合分离工艺设计优化

孙永尧1,2(), 高秋英1,2, 曾文广1,2, 王佳铭3, 陈艺飞3, 周永哲3, 贺高红3, 阮雪华3()   

  1. 1.中国石油化工股份有限公司西北油田分公司,新疆 乌鲁木齐 830011
    2.中国石油化工集团公司碳酸盐岩缝洞型油藏 提高采收率重点实验室,新疆 乌鲁木齐 830011
    3.大连理工大学化工学院盘锦分院,辽宁 盘锦 124221
  • 收稿日期:2022-12-13 修回日期:2023-05-03 出版日期:2023-05-05 发布日期:2023-06-29
  • 通讯作者: 阮雪华
  • 作者简介:孙永尧(1996—),男,硕士,工程师,2253893150@qq.com
  • 基金资助:
    科技部重点专项国际合作项目(2019YFE0119200);国家自然科学基金项目(21978033);教育部长江学者奖励计划项目(Q2020059);辽宁省兴辽英才计划项目(XLYC1907063);大连市科技计划项目(2021JJ12GX019)

Design and optimization of membrane-based integration process for advanced utilization of associated gases in N2-EOR oilfields

Yongyao SUN1,2(), Qiuying GAO1,2, Wenguang ZENG1,2, Jiaming WANG3, Yifei CHEN3, Yongzhe ZHOU3, Gaohong HE3, Xuehua RUAN3()   

  1. 1.Northwest Oilfield Company, SINOPEC Corporation, Urumchi 830011, Xinjiang, China
    2.Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs, SINOPEC Corporation, Urumchi 830011, Xinjiang, China
    3.School of Chemical Engineering at Panjin, Dalian University of Technology, Panjin 124221, Liaoning, China
  • Received:2022-12-13 Revised:2023-05-03 Online:2023-05-05 Published:2023-06-29
  • Contact: Xuehua RUAN

摘要:

近年来,随着氮气强化采油的不断推广,含氮油田伴生气产量不断增加,生产合格的管道天然气成为提高资源利用率、增加经济效益的重要命题。本研究从组成特征出发,成功研制并批量生产功能层减薄至700 nm的硅橡胶复合膜,大幅提高分离能力,未溶胀状态下甲烷渗透速率达到358 GPU [1 GPU=1.24 mol/(m2·h·MPa)],同时提出浅冷液化与多级膜渗透集成的耦合分离工艺,在充分回收乙烷和丙烷等化工原料的同时,生产热值满足国家标准GB 17820—2018的管道天然气,实现伴生气高效提质和综合利用。以西北油田某集输站为实施案例,针对7000 m3/h(标准工况)伴生气进行耦合工艺设计,模拟结果显示轻烃收率大于77.6%,甲烷提质利用率大于54.4%,乙烯裂解原料产量23604 t/a,管道天然气产量18.03×106 m3/a(标准工况),创造经济效益预计可达79.0×106 CNY/a,为含氮油田伴生气的高效利用提供了极具前景的加工途径。

关键词: 膜分离, 油田伴生气, 天然气, 优化设计, 过程强化

Abstract:

The enhanced oil recovery technology driven by nitrogen, usually abbreviated as N2-EOR, has been widely launched in Chinese oilfields in recent years. As a result, more and more associated gases are discharged with excessive nitrogen concentration. In this instance, the methods to upgrade the unconventional and inferior resources into qualified natural gas for pipeline transmission, with the intent to enhance material utilization and increase economic benefit, are urgently demanded. After meticulously thinking about associated gases’ feature and added value, two crucial missions are accomplished in this research: the high permeable PDMS composite membrane modules are fabricated, the integrated separation process including the shallow condensation and the multi-membrane permeation units are customized. It is anticipated that this novel process can generate chemical feedstock with sufficient ethane and propane recovery, and meanwhile, generate qualified natural gas meeting Chinese National Standard, i.e., GB 17820—2018. Taking a gathering and transportation station in Northwest Oilfield as an implementation case, the coupled process design was carried out for 7000 m3/h associated gas. The simulation results show that the yield of light hydrocarbons is greater than 77.6%, the utilization rate of methane upgrading is greater than 54.4%, and the output of ethylene cracking raw materials is 23604 t/a. The pipeline natural gas output is 18.03×106 m3/a, and the economic benefit is expected to reach 79.0×106 CNY/a, which provides a promising processing approach for the efficient utilization of nitrogen-containing oilfield associated gas.

Key words: membrane separation, oilfield associated gas, natural gas, optimum design, process intensification

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