Development of a thermal fracturing model for cold CO2 injection in enhanced geothermal systems

开发增强地热系统中冷二氧化碳注入的热压裂模型

• 批准号: 555602-2020
• 负责人: Yin, ShundeS
• 金额: $ 1.52万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748807
• 关键词: Development; thermal; fracturing; model; cold

Due to the economic and environmental constraints on oil and gas development, there is strong demand for high performance simulation software for stimulation of deep geothermal reservoir in hot dry rock of low permeability with enhanced geothermal systems (EGS), where rock is fractured for cold water to flow through and to be heated for electricity generation. However, there is a gap in service industry to provide sophisticated fracturing simulation software to facilitate EGS. Petro-Geotech Inc. (PGI), a global progressive geomechanics and geotechnical engineering software developing company headquartered in Calgary, Canada. To keep the lead in the industry, PGI is looking to develop sophisticated reservoir and fracture simulation tools for EGS, incorporating thermal fracturing modeling. Partnered with thermal fracture modeling experts at the University of Waterloo (UW), PGI will advance development of sophisticated thermal fracturing models for EGS with higher efficiency. Project objectives include: (1) development of a cold CO2 fracturing model for EGS with heat convection properly addressed; (2) an improved CO2 fracturing model that addresses the overburden effect using the displacement discontinuity method; (3) a further improved thermal fracturing model that considers natural fractures in EGS. Project results will include a sophisticated thermal fracturing model for EGS, a product that is expected to have great potential to increase the accuracy in heat transfer, stress redistribution and thermal fracture propagation monitoring. Benefits will include more affordable geothermal energy, an additional environmental-friendly heat source, reduction in greenhouse gas, and increased heat extraction efficiency. By utilizing recyclable CO2, the technology will reduce water usage in remote areas where water supplies are difficult, and a smaller scale power generator developed from the EGS (integrated with a heating system) can be both environmentally and economically attractive in Canada. The proposed research works are believed to benefit the employment and renewable energy economy by boosting the geothermal energy industry in Canada.

由于对石油和天然气开发的经济和环境限制，对高性能模拟软件的需求很强，以刺激低渗透性的热干燥岩石中的深地热储层，并增强地热系统（EGS），其中将岩石破裂以使冷水流过并流动并被加热以发电。但是，服务行业存在差距，以提供复杂的破裂模拟软件以促进EGS。 Petro-Geotech Inc.（PGI），一家全球进步的地球力学和岩土工程软件开发公司，总部位于加拿大卡尔加里。为了保持行业的领先优势，PGI希望为EGS开发复杂的储层和断裂模拟工具，并结合热压裂建模。 PGI与滑铁卢大学（UW）的热断裂建模专家合作，将推动为EGS开发具有较高效率的EGS的复杂热压裂模型。项目目标包括：（1）为EGS开发冷热对流的冷CO2压裂模型； （2）改进的二氧化碳断裂模型，该模型使用位移不连续方法来解决过度效果； （3）进一步改进的热压裂模型，该模型考虑了EGS中的天然断裂。 项目的结果将包括EGS的复杂热压裂模型，该产品有望具有提高传热准确性，应力再分配和热断裂传播监测的巨大潜力。好处将包括更负担得起的地热能，一种额外的环境友好型热源，减少温室气体以及提高供热效率。通过利用可回收二氧化碳，该技术将减少供水困难的偏远地区的用水量，并且从EGS开发的较小规模的发电机（与加热系统集成）在加拿大可以在环境和经济上具有吸引力。拟议的研究工作被认为可以通过促进加拿大的地热能行业来受益于就业和可再生能源经济。