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Experimental investigation of CO2-oil interactions in tight rocks: A Montney case study

机译:致密岩石中CO 2-油相互作用的实验研究:蒙特尼案例研究

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摘要

This paper presents comprehensive rock-fluid experiments to study the possibility of oil recovery improvement when CO2 is injected as a fracturing fluid in the Montney tight-oil play, located in the Western Canadian Sedimentary Basin. This study consists of four phases: In phase 1, we conduct constant composition expansion (CCE) tests with different CO2 concentrations using a PVT cell. In phase 2, we visualize CO2-oil interactions at reservoir pressure and temperature in a custom-designed visual cell. Then, we conduct SEM/EDS analysis on the solid precipitates in the visual cell due to CO2-oil interactions. In phase 3, we soak the oil-saturated core plugs in the visual cell, pressurize the cell with CO2, and measure the oil recovery. In phase 4, we conduct cyclic CO2 tests using a core flooding system, and measure the oil recovery.
机译:本文提出了全面的岩石流体实验,以研究在位于加拿大西部沉积盆地的蒙尼致密油层中,将CO2作为压裂液注入时提高采收率的可能性。这项研究包括四个阶段:在阶段1中,我们使用PVT电池对不同的CO2浓度进行恒定成分膨胀(CCE)测试。在第2阶段中,我们在定制设计的可视单元中可视化了油藏压力和温度下的CO2油相互作用。然后,我们对由于CO2油相互作用而产生的视觉单元中的固体沉淀物进行SEM / EDS分析。在第3阶段中,我们将油饱和的岩心塞浸泡在可视单元中,用CO2加压单元,并测量采油量。在第4阶段,我们使用岩心驱油系统进行循环CO2测试,并测量采油量。

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