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Development of alkane solvents enhanced steam + flue gas processes for enhancing heavy oil recovery from post-CHOPS reservoirs

开发烷烃溶剂增强蒸汽烟气工艺，以提高 CHOPS 后油藏的重油采收率

基本信息

批准号：
514877-2017
负责人：
Yang, Daoyong
金额：
$ 9.08万
依托单位：
University of Regina
依托单位国家：
加拿大
项目类别：
Collaborative Research and Development Grants
财政年份：
2021
资助国家：
加拿大
起止时间：
2021-01-01 至 2022-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=719368
关键词：
Development alkane solvents enhanced steam

项目摘要

As for the enormous heavy oil reserves deposited in Western Canada, the most common production process is the cold heavy oil production with sand (CHOPS) which can typically recover only 5-15% of original-oil-in- place due to both wormhole generation and foamy oil flow. As such, efficient follow-up enhanced oil recovery (EOR) techniques are required in these post-CHOPS reservoirs where both conventional steam-based thermal recovery techniques and solvent-based non-thermal recovery techniques find their limits. In practice, flue gas that typically consists of 80-88% N2 and 12-20% CO2 can be used as an efficient immiscible agent for enhancing heavy oil recovery through a free gas mechanism provided by N2 and a solubilization mechanism provided by CO2. The overall objective of this proposed research is to not only investigate the suitability and applicability for enhancing heavy oil recovery from the post-CHOPS reservoirs through the alkane/water-soluble solvents enhanced steam + flue gas recovery processes while minimizing environmental footprint, but also evaluate the possibility of safely storing CO2 in the depleted geological formations.With the successful development of direct contact steam generation (DCSG) processes referred to as the submerged combustion vaporizers (SCVs), this allows directly converting the untreated oilfield produced water into high-quality steam together with clean flue gas at high efficiency and low cost. With addition of alkane/water-soluble solvents, the newly proposed flue gas-assisted thermal recovery techniques with the optimized SCV operating parameters will be extended to the pilot tests in the targeted post-CHOPS reservoirs. The proposed research has the potential of providing the upstream oil and gas industry with viable techniques for efficiently and effectively recovering heavy oil from post-CHOPS reservoirs by taking advantages of both flue gas and thermal energy while minimizing freshwater usage as well as mitigating CH4 and CO2 emissions. This will also help Canada to become a technology resource centre, focusing on the usage of flue gases, EOR techniques for heavy oil reservoirs, and CO2 storage.

至于加拿大西部蕴藏的巨大稠油储量，最常见的生产工艺是带砂冷稠油开采(CHOP)，由于虫孔生成和泡沫原油流动，通常只能回收原地石油的5%-15%。因此，在这些斩波后油藏中需要有效的后续提高采油(EOR)技术，传统的基于蒸汽的热采技术和基于溶剂的非热采技术都找到了它们的局限性。在实际应用中，通常含有80-88%的氮气和12-20%的二氧化碳的烟道气，可以通过氮气提供的游离气机制和二氧化碳提供的增溶机制，作为提高稠油采收率的有效不相溶剂。这项拟议研究的总体目标不仅是为了在最大限度地减少环境影响的情况下，研究通过烷烃/水溶性溶剂强化蒸汽+烟道气回收工艺从碎屑后油藏提高稠油采收率的适宜性和适用性，而且还评估在枯竭的地质地层中安全储存二氧化碳的可能性。随着直接接触蒸汽产生(DCSG)工艺的成功开发，被称为浸没式燃烧汽化器(SCVS)，这使得直接将未经处理的油田产出的污水以高效率和低成本与清洁烟道气一起转化为高质量的蒸汽。随着烷烃/水溶性溶剂的加入，新提出的优化了SCV操作参数的烟道气辅助热采技术将推广到目标斩波后油藏的先导试验。拟议的研究有可能为上游石油和天然气行业提供可行的技术，通过利用烟道气和热能，同时最大限度地减少淡水使用量，并减少CH4和CO2排放，有效和有效地从CHP后的储油层中回收重油。这也将有助于加拿大成为技术资源中心，专注于烟道气的使用、稠油油藏的提高采收率技术以及二氧化碳储存。