油气藏评价与开发 ›› 2021, Vol. 11 ›› Issue (6): 845-851.doi: 10.13809/j.cnki.cn32-1825/te.2021.06.007

• 方法理论 • 上一篇    下一篇

超临界CO2萃取致密砂砾岩中原油效果影响因素实验研究

户海胜1(),高阳1,单江涛1,雷现梅2,张玉龙3,张广超3,叶仲斌3   

  1. 1.中国石油新疆油田分公司勘探开发研究院,新疆 克拉玛依 834000
    2.四川华油集团有限责任公司,四川 成都 610017
    3.油气藏地质与开发工程国家重点实验室,四川 成都 610500
  • 收稿日期:2020-08-25 出版日期:2021-12-26 发布日期:2021-12-31
  • 作者简介:户海胜(1986—),男,硕士,工程师,从事油藏工程。地址:新疆克拉玛依市克拉玛依区准噶尔路32号,邮政编码:834000。E-mail: 382918402@qq.com
  • 基金资助:
    国家科技重大专项“准噶尔盆地致密油开发示范工程”(2017ZX05070)

Experimental researches on factors influencing supercritical CO2 extraction effect of crude oil from tight sandy conglomerate

HU Haisheng1(),GAO Yang1,SHAN Jiangtao1,LEI Xianmei2,ZHANG Yulong3,ZHANG Guangchao3,YE Zhongbin3   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
    2. Sichuan Huayou Group Co., Ltd., Chengdu, Sichuan 610017, China
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu, Sichuan 610500, China
  • Received:2020-08-25 Online:2021-12-26 Published:2021-12-31

摘要:

为提高致密砂砾岩油藏原油采收率,基于新疆玛湖致密砂砾岩油藏储层条件,通过利用超临界CO2萃取致密砂砾岩岩心中的致密油,采用单因素分析法依次对影响致密油萃取效果的压力(7~25 MPa)、温度(30~60oC)、浸泡时间(30~180 min)及循环时间(30~180 min),共4项生产参数进行了优化分析。结果表明:超临界CO2能够萃取出致密砂砾岩中原油且效果较好,萃取率最高可达25.22 %。通过对以上4项生产参数进行4因素3水平的正交设计实验L9(34),发现影响超临界CO2萃取原油效果的因素具有主次顺序:压力>浸泡时间>温度>循环时间。最优参数方案为:压力25 MPa,温度50oC,浸泡时间120 min,循环时间150 min。致密砂砾岩储层应用CO2萃取原油具有良好的应用前景。

关键词: 超临界CO2, 萃取, 致密砂砾岩油藏, 萃取率, 影响因素

Abstract:

In order to improve the oil recovery of tight sandy conglomerate reservoir, the tight oil in the tight glutenite core is extracted by the supercritical CO2 based on the reservoir conditions of Mahu tight sandy conglomerate reservoir in Xinjiang. And then, four production parameters affecting tight oil extraction, which are the pressure(7~25 MPa), the temperature(30~60 ℃), the soaking time(30~180 min) and the cycle time(30~180 min), have been optimized and analyzed by the single factor analysis method. The results show that the supercritical CO2 can extract the crude oil from the tight glutenite with relatively good effects, and the extraction rate can reach up to 25.22 %. By the orthogonal design experiment L9(34) with four factors and three levels for the above four production parameters, it is found that the factors influencing the extraction effect of crude oil by supercritical CO2 have primary and secondary order: pressure > immersion time > temperature > circulating time. The optimal parameter scheme is the pressure of 25 MPa, tht temperature of 50 ℃, the soaking time of 120 min, and the cyclic time of 150 min. The application of CO2 to extract crude oil in tight glutenite reservoirs has good application prospects.

Key words: supercritical CO2, extraction, tight sandy conglomerate reservoir, extraction rate, influence factor

中图分类号: 

  • TE357