岩性油气藏 ›› 2024, Vol. 36 ›› Issue (1): 169–177.doi: 10.12108/yxyqc.20240116

• 石油工程与油气田开发 • 上一篇    下一篇

DES+CTAB复配驱油剂体系提高低渗致密砂岩油藏采收率机理

白佳佳1,2, 司双虎1, 陶磊1, 王国庆1, 王龙龙1, 史文洋1, 张娜3, 朱庆杰1   

  1. 1. 常州大学 石油与天然气工程学院, 江苏 常州 213164;
    2. 陕西省油气田特种增产技术重点实验室(西安石油大学), 西安 710065;
    3. 常州大学 石油化工学院, 江苏 常州 213164
  • 收稿日期:2022-10-29 修回日期:2022-12-09 出版日期:2024-01-01 发布日期:2024-01-02
  • 第一作者:白佳佳(1993-),男,博士,讲师,主要从事致密油气藏储层保护及提高采收率方面的教学与研究工作。地址:(213164)江苏省常州市武进区滆湖中路21号。Email:baijiajiaa@163.com。
  • 通信作者: 陶磊(1981-),男,博士,教授,主要从事油气增产与提高采收率方面的教学研究工作。Email:taolei2637@163.com。
  • 基金资助:
    陕西省油气田特种增产技术重点实验室开放基金项目“页岩渗吸压裂液对甲烷多尺度输运的增益机理研究”（编号：KFJJ-TZ-2022-3）资助。

Mechanism of DES+CTAB composite oil displacement agent system to improve oil recovery of low-permeability tight sandstone reservoirs

BAI Jiajia1,2, SI Shuanghu1, TAO Lei1, WANG Guoqing1, WANG Longlong1, SHI Wenyang1, ZHANG Na3, ZHU Qingjie1   

  1. 1. School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;
    2. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an Shiyou University, Xi'an 710065, China;
    3. School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
  • Received:2022-10-29 Revised:2022-12-09 Online:2024-01-01 Published:2024-01-02

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摘要： 针对低渗致密油藏注水困难、采收率低等问题，利用尿素基深共晶溶剂（DES）与十六烷基三甲基溴化铵（CTAB）复配的驱油剂体系，对驱油剂在低渗致密油藏中的降压增注和提高采收率机理进行了研究。研究结果表明： ①驱油剂体系可以将油水界面张力降低至10-3 mN/m以下，大大提高了洗油效率； ②驱油剂体系可有效抑制黏土矿物水化，避免了低渗致密砂岩中黏土矿物水化膨胀带来的流体敏感性损害； ③驱油剂体系可对砂岩表面进行界面修饰，驱油剂溶液浸泡后样品的油相接触角由25.8°增加至61.4°，亲水性增强，亲油性减弱，有助于吸附在岩石孔隙壁面的油膜脱落； ④超前注入驱油剂的注入压力降低率平均为79.64%，采收率平均为50.96%，远大于常规水驱（一次注水→注驱油剂驱→二次注水）的采收率。

关键词: 低渗致密砂岩油藏, 尿素基深共晶溶剂(DES), 十六烷基三甲基溴化铵(CTAB), 水驱, 黏土矿物水化膨胀, 表面活性剂, 提高采收率

Abstract: Aiming at the problems of difficult water injection and low recovery in low-permeability tight reservoirs, an oil displacement agent composed of urea-based deep eutectic solvent(DES) and cetyltrimethylammonium bromide(CTAB) was developed to study the mechanism of reducing pressure and increasing injection and improving recovery in low-permeability tight sandstone reservoirs. The results show that:(1) The oil displacement agent system can reduce the oil-water interfacial tension to below 10-3 mN/m, which can greatly improve the oil washing efficiency.(2) The developed oil displacement agent has good clay mineral hydration inhibition, effectively avoiding the fluid sensitivity damage caused by the hydration expansion of clay minerals in low permeability tight sandstone.(3) The oil displacement agent system can modify the interface of sandstone surface. The oil phase contact angle of the samples after soaked by the oil displacement agent system increases from 25.8° to 61.4°, the hydrophilicity increases and the lipophilicity decreases, which contributes to the shedding of the oil film adsorbed on the rock surface.(4) The average reduction rate of injection pressure of advanced injection oil displacement agent is 79.64%, and the average recovery rate is 50.96%, which is much higher than the recovery rate of conventional water flooding(primary water injection→oil displacement agent injection→secondary water injection).

Key words: low-permeability tight sandstone reservoir, urea-based deep eutectic solvent, cetyltrimethylammonium bromide, water flooding, hydration expansion of clay minerals, surfactant, enhanced oil recovery

中图分类号: 

  • TE357
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