Rock damage mechanisms of hydrocarbon formations re-purposed for geothermal utilization

地热利用碳氢化合物地层的岩石损伤机制

基本信息

批准号：
571099-2021
负责人：
Zheng, Wenbo
金额：
$ 1.82万
依托单位：
University of Northern British Columbia
依托单位国家：
加拿大
项目类别：
Alliance 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=729029
关键词：
Rock damage mechanisms hydrocarbon formations

项目摘要

Canada is one of the largest natural gas producers in the world. Global warming and climate change require the natural gas sector and society to shift from fossil fuels to clean and renewable energy. One viable option is to re-purpose oil and gas wells to produce sustainable geothermal energy. However, high fluid flow rate, varying fluid pH and salinity, and high closure stress present complex chemical and mechanical deteriorating effects on formation rocks, which hinder the long-term conductivity of reservoirs vital to geothermal utilization. The proposed research project will enable collaboration with a world-renowned expert on a globally important subject that can benefit Canada. The specific objectives of the project are to (1) examine the geochemical effect imposed by geothermal fluids with various pH and salinity on rock formations encountered in gas reservoirs near Clarke Lake in northeastern BC, and (2) investigate the changes in the strength and permeability of formation rock due to mineral and pore structure alteration.The research outcomes will improve our understanding of the deterioration mechanisms of hydrocarbon rock formations in geothermal utilization and provide technical recommendations on fluid pH and salinity to mitigate the formation damage during geothermal operation. This provides a step-change opportunity for over 20,000 wells drilled in northeastern BC and millions of wells globally, ultimately enhancing Canada's role in developing sustainable geothermal energy and reducing Canada's reliance on fossil fuel.

加拿大是世界上最大的天然气生产商之一。全球变暖和气候变化要求天然气部门和社会从化石燃料转向清洁和可再生能源。一种可行的选择是重新使用石油和天然气井来生产可持续的地热能。然而，高流体流速，流体pH和盐度的变化以及高闭合应力表现出对地层岩石的复杂化学和机械恶化影响，这阻碍了储层对地热利用至关重要的储层的长期电导率。拟议的研究项目将与一位世界知名的全球重要主题的专家合作，可以使加拿大受益。该项目的具体目的是（1）检查地热流体在卑诗省克拉克湖附近遇到的岩层中遇到的岩层中施加的地热流体所施加的地球化学作用，（2）研究强度和渗透性的变化由于矿物质和孔结构的改变而导致的地层岩石。研究结果将提高我们对地热利用中碳氢化合物形成的恶化机制的理解，并提供有关液体pH和盐度的技术建议，以减轻地层操作期间的地层损害。这为卑诗省东北部和全球数百万井的20,000多个井提供了逐步的机会，最终增强了加拿大在开发可持续地热能和减少加拿大对化石燃料的依赖方面的作用。