Microscopic Visualization with High Resolution Optical-Fiber Scope at Steam Chamber Interface of SAGD Process

SAGD 工艺蒸汽室接口处的高分辨率光纤显微镜显微可视化

• 批准号: 12450412
• 负责人: SASAKI Kyuro
• 金额: $ 8.64万
• 依托单位: AKITA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450412/
• 关键词: Oil Sands; SAGD Method; Steam Chamber; Fiber Scope; Microscopic Phenomena; Emulsion; STARS; Stone One Model; フアイバースコープ; Oil Sands; SAGD Method; Steam Chamber; Fiber Scope; Microscopic Phenomena; Emulsion; Stone One Model

Experiments and numerical simulations on fluids flow characteristics in steam chambers with the steam-assisted gravity drainage (SAGD) process were carried out. Experimental studies used two-dimensional scaled reservoir models to investigate microscopic fluids flows in the steam chamber and production fluids. The rise and growth of the initial steam chamber were observed and visualization of micro-phenomena at inclined interface on the side of the steam chamber with a high-resolution optical-fiber scope was carried out. Very fine water droplets of 0.01 mm order hi size were observed at the interface between steam and heavy oil phases. These droplets entered into heavy oil phase and created emulsion together with the heated oil, which flowed down and was produced from the production well. It was successfully demonstrated that these micro phenomena has an influence on chamber expansion rate hi horizontal direction and oil production rate.The numerical simulation of the SAGD process was also performed. The thermal simulator, CMC's STARS, was used to simulate (he experimental steam chamber growth at the initial stage. The simulation used the two-components (water and heavy oil) black oil, threephase (water, heavy oil and steam) and three-dimensional numerical model for the physical model. The results from the history-matched numerical simulation were found to be in good agreement with those of the experiments for oil production and steam chamber shape by using the Intermediate3-Stone1 wettability raodel represents fluids behavior cumulating the microscopic phenomena at the chamber interface. Furthermore, a new process named Surfactant-SAGD injecting a surfactant before starting steam injection to enhance the communication between two wells and mobility of ihe production fluids was tested.

对蒸汽辅助重力泄油（SAGD）工艺蒸汽室内流体流动特性进行了实验和数值模拟。实验研究使用二维缩放的储层模型来研究蒸汽室和生产流体中的微观流体流动。观察了初始蒸汽室的上升和增长，并利用高分辨率光纤显微镜对蒸汽室侧面倾斜界面处的微观现象进行了可视化。在蒸汽相和稠油相的界面上观察到了0.01 mm量级的极细水滴。这些液滴进入重油相，与加热的油一起形成乳状液，乳状液向下流动并从生产井中产出。成功地证明了这些微观现象对腔体水平方向膨胀率和产油量的影响，并对SAGD过程进行了数值模拟。采用CMC的STARS热模拟器模拟了实验蒸汽室初始阶段的生长。模拟采用了双组分（水和稠油）黑油、三相（水、稠油和蒸汽）三维数值模型为物理模型。采用Intermediate 3-Stone 1润湿性模型，对蒸汽室界面处的微观现象进行了模拟，模拟结果与实验结果吻合较好。在此基础上，试验了在注汽前注入表面活性剂以提高两口威尔斯井连通性和采出液流动性的表面活性剂-SAGD工艺。