Short-term and long-term behaviour of clay shale as caprock for in situ thermal (heavy oil) recovery processes

粘土页岩作为原位热（重油）采收过程盖层的短期和长期行为

• 批准号: 138022-2010
• 负责人: Wong, Ron
• 金额: $ 1.75万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=451736
• 关键词: Short; term; long; behaviour; clay

Steam stimulation is one of the viable in situ methods to recover heavy oil from deep oil sand reservoirs in Alberta. For sustainable development, a competent caprock must exist above the oil sand reservoir to prevent any upward hydraulic and thermal migration into the overburden. The hydraulic and structural integrity of the caprock must be maintained as these in situ thermal recovery processes induce significant short-term and long-term deformation in the caprock. The main objectives of the proposal research are to develop quantitative methodologies in assessing natural geological formations such as shale and mudstone as caprock for in situ thermal steam-stimulated processes. Natural caprock cores will be tested in laboratory under the short-term and long-term environmental changes encountered in the field. The short-term environmental changes include shearing deformation, high temperature heating, and pore pressure elevation. The short-term structural and hydraulic behaviour of the caprock subjected to these severe environmental conditions will be studied using a new high temperature and pressure testing facility. The long-term behaviour such as swelling under pore fluid chemistry alteration and creep under sustained shearing and heating will be also investigated. Long-term degradation in caprock structural-hydraulic integrity is the key research subject. New innovative accelerated testing methods will be developed to shorten the test duration. New criteria on structural and hydraulic integrity will be developed from this research investigation for performance evaluation of shale and mudstone as caprock for thermal recovery processes. The findings from this research investigation can be transferred to other research activities such as carbon storage and waste water disposal.

蒸汽刺激是从艾伯塔省深油砂库中回收重油的可行原位方法之一。为了进行可持续发展，必须在油砂储层上方存在一个有能力的水库，以防止任何向上的液压和热迁移到覆盖层。必须将毛质的液压和结构完整性保持在原位热恢复过程中，从而引起卡普岩的显着短期和长期变形。提案研究的主要目标是开发定量方法，以评估天然地质形成，例如页岩和泥岩作为原位热蒸汽刺激的过程。在野外遇到的短期和长期环境变化下，将在实验室中测试天然的Caprock核心。短期的环境变化包括剪切变形，高温加热和孔隙压力高度。将使用新的高温和压力测试设施来研究经受这些严重环境条件的Caprock的短期结构和液压行为。还将研究长期行为，例如在孔隙流体化学改变下肿胀以及持续的剪切和加热下的蠕变。 CapRock结构融合完整性的长期降解是关键研究主题。将开发新的创新加速测试方法以缩短测试持续时间。这项研究调查将制定有关结构和液压完整性的新标准，以评估页岩和泥岩作为热恢复过程的Caprock。这项研究调查的发现可以转移到其他研究活动中，例如碳存储和废水处理。