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

基本信息

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

项目摘要

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.

蒸汽吞吐是从艾伯塔省深层油砂油藏中开采重油的可行方法之一。为了可持续发展，油砂储层上方必须存在有效的盖层，以防止任何向上的水力和热力迁移到上覆岩层中。必须保持盖层的水力和结构完整性，因为这些原位热采过程会引起盖层显着的短期和长期变形。该提案研究的主要目标是开发定量方法来评估自然地质构造，例如作为原位热蒸汽刺激过程盖层的页岩和泥岩。天然盖层岩心将在实验室中测试现场遇到的短期和长期环境变化。短期环境变化包括剪切变形、高温加热、孔隙压力升高等。将使用新的高温和压力测试设施来研究盖层在这些恶劣环境条件下的短期结构和水力行为。还将研究长期行为，例如孔隙流体化学变化下的膨胀以及持续剪切和加热下的蠕变。盖层结构水力完整性的长期退化是关键研究课题。将开发新的创新加速测试方法以缩短测试时间。这项研究将制定关于结构和水力完整性的新标准，用于评估页岩和泥岩作为热采过程盖层的性能。这项研究的结果可以转移到其他研究活动中，例如碳储存和废水处理。