Geochemical Investigation of CO2 Injection in Oil and Gas Reservoirs of Middle East to Estimate the Formation Damage and Related Oil Recovery
Geochemical Investigation of CO2 Injection in Oil and Gas Reservoirs of Middle East to Estimate the Formation Damage and Related Oil Recovery
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DOI：
10.3390/en14227676
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发表时间：
2021-11-01
期刊：
影响因子：
3.2
通讯作者：
Afgan, Imran
中科院分区：
文献类型：
--
作者：
Khurshid, Ilyas;Afgan, Imran
二氧化碳（CO2）用于采油的注入性能取决于其注入能力和实际注入量。 CO2-岩石-水相互作用可能会堵塞储层孔隙并降低储层渗透率，从而导致严重的地层损害。在这项研究中，开发了一个模拟器来模拟在不同温度和压力条件下不同储层深度注入二氧化碳的反应性。通过估计化学反应的位置和强度，模拟器能够预测储层孔隙度、渗透率（由于形成/溶解）和溶解颗粒的传输/沉积变化的影响。本文还介绍了沥青质对相对渗透率曲线移动和相关采收率的影响。最后，分析 CO2 注入速率的影响，以证明 CO2 混相性对油藏采收率的影响。所开发的模型根据实验数据进行了验证。预测结果表明，储层温度、深度、沥青质浓度和岩石性质对CO2注入过程中的形成/溶解和沉淀有显着影响。结果表明，与浅层油气藏相比，深层油气藏是二氧化碳封存的良好候选者，因为温度升高会降低溶解速率并减少固体沉淀。然而，沥青质沉积使石油采收率降低了10%。此外，还进行了 CO2 注入量的敏感性分析，以确定 CO2 注入量对深层和高温地层渗透率降低的影响。结果发现，增加二氧化碳注入速率和压力使我们能够达到混溶压力。一旦达到这个压力，以更高的速率注入二氧化碳以实现更好的压力维持的好处就会减少，而且残油不会进一步减少。
The injection performance of carbon dioxide (CO2) for oil recovery depends upon its injection capability and the actual injection rate. The CO2-rock-water interaction could cause severe formation damage by plugging the reservoir pores and reducing the permeability of the reservoir. In this study, a simulator was developed to model the reactivity of injected CO2 at various reservoir depths, under different temperature and pressure conditions. Through the estimation of location and magnitude of the chemical reactions, the simulator is able to predict the effects of change in the reservoir porosity, permeability (due to the formation/dissolution) and transport/deposition of dissoluted particles. The paper also presents the effect of asphaltene on the shift of relative permeability curve and the related oil recovery. Finally, the effect of CO2 injection rate is analyzed to demonstrate the effect of CO2 miscibility on oil recovery from a reservoir. The developed model is validated against the experimental data. The predicted results show that the reservoir temperature, its depth, concentration of asphaltene and rock properties have a significant effect on formation/dissolution and precipitation during CO2 injection. Results showed that deep oil and gas reservoirs are good candidates for CO2 sequestration compared to shallow reservoirs, due to increased temperatures that reduce the dissolution rate and lower the solid precipitation. However, asphaltene deposition reduced the oil recovery by 10%. Moreover, the sensitivity analysis of CO2 injection rates was performed to identify the effect of CO2 injection rate on reduced permeability in deep and high-temperature formations. It was found that increased CO2 injection rates and pressures enable us to reach miscibility pressure. Once this pressure is reached, there are less benefits of injecting CO2 at a higher rate for better pressure maintenance and no further diminution of residual oil.