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首页> 外文会议>Society of Petroleum Engineers Enhaneed Oil Recovery Conference >Experimental and Numerical Simulation Studies of Different Modes of CO2 Injection in Fractured Carbonate Cores
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Experimental and Numerical Simulation Studies of Different Modes of CO2 Injection in Fractured Carbonate Cores

机译：裂缝碳酸岩岩体CO2注射多种模式的实验性和数值模拟研究

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We have performed a miscible CO2 flood study using fractured and unfractured carbonate cores and 31° API west Texas oil to evaluate oil recovery under three main injection modes: SWAG, WAG, and CGI. For each injection mode, three cases were considered: unfractured, one horizontal fracture and two fractures (one horizontal and one vertical). Increasing the number of fractures will investigate different shape factors such as the elongated slab and sugar cube models. Then, a commercial simulator was used to match the experimental results and model the fractures. The experimental results may be summarized as follows. First, for the unfractured case, the oil recoveries for SWAG, WAG, and CGI are 98, 92, and 75 % of OOIP, respectively. Second, for the elongated slab case (one horizontal fracture), the oil recoveries for SWAG, WAG and CGI decreased to 72, 70, and 27 %, respectively. Third, for sugar cube model (two fractures), the oil recoveries for SWAG, WAG and CGI are 79, 79, and 55 %, respectively. The simulation shows that the improvement in recoveries during SWAG and WAG over CGI is a result of a better conformance provided by the injected water which hindered CO2 mobility and decreased its cycling through the fracture. Also, the sugar cube model has shown better results than the elongated slab because of the presence of a vertical fracture in the middle which helped CO2 to diffuse more in the matrix and contact oil. The results suggest that injecting CGI in fractured cases is not recommended and injecting water (wetting phase) along with CO2 is essential. Finally, among all injection modes, SWAG has resulted in the most uniform displacement profile with the lowest residual oil saturation after the flood. This injection mode combines the benefits of water to transfer into the matrix with CO2 excellent displacement.
机译：我们使用骨折和无裂缝的碳酸核和31°API西德克萨斯州油进行了混溶的二氧化碳洪水研究，以评估三种主要注射模式下的石油回收：赃物，摇摆和CGI。对于每个注射模式，考虑了三种情况：未裂开，一个水平骨折和两个裂缝（一个水平和一个垂直）。增加骨折的数量将研究不同的形状因素，例如细长的板坯和糖立方体模型。然后，使用商业模拟器匹配实验结果并模拟裂缝。实验结果可以概括如下。首先，对于未裂缝的情况，SWAG，WAG和CGI的油回收率分别为98,92和75％的ooIP。其次，对于细长的板盒（一个水平骨折），沼泽性的油回收率分别降至72,70和27％。第三，对于糖立方体模型（两个骨折），SWAG，WAG和CGI的油回收率分别为79,79和55％。仿真表明，通过CGI摇摆和摇摆期间回收的改善是由注射水提供的更好一致性，其阻碍了CO 2迁移率并降低了通过骨折的循环。而且，由于中间的垂直骨折存在，糖立方体模型显示出比细长的板坯更好的结果，这有助于CO 2在基质中更多地扩散并接触油。结果表明，不建议注入裂缝病例中的CGI并注入水（润湿阶段）以及CO2是必不可少的。最后，在所有注射模式中，赃物导致了最均匀的位移轮廓，洪水之后的剩余油饱和度最低。该喷射模式将水的益处与CO 2优异的位移相结合以转移到基质中。

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