伍晓林,侯兆伟,杨勇,陈劼,王海峰,聂春林
WU Xiaolin,HOU Zhaowei,YANG Yong,CHEN Jie,WANG Haifeng,NIE Chunlin

• 1:中国石油大庆油田有限责任公司
• 2:国家能源陆相砂岩老油田持续开采研发中心
• 3:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

为了进一步提高松辽盆地古龙页岩油采收率，依据古龙页岩储层特征和原油性质，基于表面活性剂与原油形成微乳液的相态理论和稠化剂分子构效关系，设计出易于在油水界面分布的耐温表面活性剂分子、具有大体积基团、刚性基团的稠化剂分子，合成出具有优良界面性能的耐高温表面活性剂和用于压裂携砂的耐高温稠化剂，研发出适合于古龙页岩油开发的古龙1号乳液体系。性能评价结果表明：古龙1号乳液体系兼具携砂造缝和驱洗作用，与古龙页岩油可形成中相微乳液，其粒径为纳米级别，与页岩的孔喉具有较好的配伍性，提升了扩散混溶效果，显著增强了渗吸洗油能力，渗吸实验最终洗油效率为54.6%。同时，压驱实验也表明该体系还具有多轮次返排能力，5轮次返排后总采收率可达58.17%。研究成果为古龙页岩油的高质量开发提供重要的理论技术支撑。
In order to further enhance the recovery of Gulong shale oil, based on phase behavior theory of forming microemulsion between surfactant and oil, and molecule structure-activity relationship of viscosifier, a surfactant molecular structure that is easy to distribute at oil-water interface and a viscosifier structure that embodies large volume and rigid groups on the molecular chain are designed according to the reservoir characteristics and oil property.High-temperature-resistant surfactant with excellent interface property and high-temperature-resistant viscosifier applied in sand carrying fracturing are synthesized, and Gulong 1~# emulsion system adapted in Gulong shale oil development is developed. Performance evaluation results show that Gulong 1~# emulsion system has functions of sand carrying fracture initiation and oil displacement, and can form middle-phase microemulsion when interacting with Gulong shale oil. The microemulsion has nanoscale particle size and high compatibility with pore throat size of the shale. Its nano-scale grain size has high compatibility with the pore throat size of shale, improving the diffusion and miscibility effects and significantly enhancing the imbibition displacement capacity with final displacement efficiency of imbibition experiment being 54.6%. Meanwhile, fracturing displacement experiment shows that Gulong 1~# emulsion system also exhibits multi-round flowback capacity, with total recovery enhanced as high as 58.17% after 5 rounds of flowback. The study achievements provide important theoretical and technical supports for high-quality development of Gulong shale oil.

关键词(KeyWords)： 古龙页岩油;表面活性剂;稠化剂;压裂液;中相微乳液;性能评价
Gulong shale oil;surfactant;viscosifier;fracturing fluid;middle-phase microemulsion;performance evaluation

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“大庆古龙页岩油勘探开发理论与关键技术研究”（2021ZZ10）

作者(Author): 伍晓林,侯兆伟,杨勇,陈劼,王海峰,聂春林
WU Xiaolin,HOU Zhaowei,YANG Yong,CHEN Jie,WANG Haifeng,NIE Chunlin

DOI: 10.19597/J.ISSN.1000-3754.202111090

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