The impact of hydrate production on the stability of hydrate-bearing reservoirs

水合物产量对含水合物储层稳定性的影响

• 批准号: RGPIN-2019-04835
• 负责人: Priest, Jeffrey
• 金额: $ 3.13万
• 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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=688723
• 关键词: impact; hydrate; production; stability; bearing

In Canada's northern frontier, under the permafrost and within the cold marine sediments on the Arctic continental slope, are enormous reserves of methane gas. These gas reserves are trapped in ice-like gas hydrate found occupying the pore spaces of course sediments. Recognizing the vast potential energy stored in hydrate form, small-scale field trials tried, and successfully produced, methane gas from hydrate. Hydrate production requires dissociation of the ice-like hydrate into its constituent parts of gas and water. Each production test expected and indeed relied on dissociation; yet, despite the increasing availability of data, every field test has encountered critical issues, in some cases causing shut down, directly as a result of changes in the geomechanical behaviour of the host sands. Realizing the energy potential of hydrate therefore requires robust numerical models that accurately capture, and then up-scale, the geomechanics to simulate the long-term response during hydrate production. ******The long-term goal of the proposed research is to enhance our fundamental understanding of the geomechanical response of hydrate-bearing sand to facilitate robust numerical modeling that assesses the economic and environmental risks associated with hydrate production. This will be realized through integrated research that combines innovative and novel laboratory testing, development of enhanced or new constitutive models and their inclusion in numerical models. The experimental stage will develop laboratory synthesized hydrate-bearing specimens whose geomechanical properties are analogous to that observed in recovered intact hydrate-bearing cores. We will subsequently test under in-situ conditions to determine the geomechanical properties, such as strength, stiffness, permeability, etc. These results will be used to refine existing, or develop new, constitutive models that define the constitutive level response of the sand during dissociation. These will subsequently be incorporated into numerical models to evaluate gas production from hydrate reservoirs, assess well-bore stabilities, and predict large scale slope instabilities associated with long-term hydrate reservoir productions scenarios. Realization of the proposed research will provide the critical information that is currently missing to accurately assess the economic and environmental risks associated with methane recovery from hydrate production. This will directly contribute to the successful development and safe stewardship of Canada's energy reserves. As hydrate is primarily located close to northern communities, successful hydrate production aligns with Canada's northern strategy to increase northern economic development and exercise northern sovereign rights. Finally, through this research program, engineers will emerge with highly desirable geomechanical skills involving both experimental and numerical techniques that incorporate highly coupled and non linear phenomena.*****

在加拿大的北部边境，在北极大陆斜坡上的永久冻土下和冷海洋沉积物中，是甲烷气的巨大储量。这些气体储量被困在冰状的水合物中，发现占据孔隙空间当然是沉积物。 认识到以水合物形式存储的巨大势能，尝试并成功产生了水合物的甲烷气体试验。 水合物的产生需要将冰样水合物解离其气体和水的组成部分。 每个预期的生产测试，确实依赖于解离；然而，尽管数据的可用性越来越高，但由于宿主砂的地质力学行为的变化，每个现场测试都遇到了关键问题，在某些情况下导致关闭。因此，意识到水合物的能量潜力需要鲁棒的数值模型，这些模型可以准确捕获，然后上尺度的地质力学，以模拟在水合产生过程中的长期响应。 *****拟议的研究的长期目标是增强我们对含水解砂的地质力学响应的基本理解，以促进鲁棒的数值建模，以评估与水合产生相关的经济和环境风险。这将通过综合研究来实现，该研究结合了创新和新颖的实验室测试，增强或新的本构模型的开发以及它们包含在数值模型中。实验阶段将开发实验室合成的含水解标本，其地质力学特性类似于在恢复的完整含水岩中观察到的。随后，我们将在原位条件下进行测试，以确定地质力学特性，例如强度，刚度，渗透性等。这些结果将用于完善现有的现有，或开发新的本构模型，以定义分离过程中沙子的本质水平响应。 随后，这些将纳入数值模型中，以评估水合物储层中的气体产生，评估井眼稳定性并预测与长期水合物储层生产场景相关的大规模坡度不稳定性。拟议研究的实现将提供目前缺少的关键信息，以准确评估与水合物产量中甲烷回收相关的经济和环境风险。这将直接有助于加拿大能源储备的成功发展和安全管理。由于水合物主要位于北部社区附近，因此，成功的水合产量与加拿大北部经济发展和行使北部主权权利的战略保持一致。最后，通过这项研究计划，工程师将以高度理想的地质力学技能涉及实验和数值技术，这些技巧结合了高度耦合和非线性现象。*****