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Supercritical CO2 sequestration and enhanced gas recovery in tight gas reservoirs: Feasibility and factors that influence efficiency
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2020-12-26 , DOI: 10.1016/j.ijggc.2020.103234
Jingchen Ding , Changhui Yan , Yongming He , Changcheng Wang

Tight gas reservoirs always have a low natural gas recovery because of the poor reservoir properties. Effective means on achieving enhanced gas recovery (EGR) in this type of reservoir remain a challenging task. In this study, experimental investigations on supercritical carbon dioxide (SCCO2) sequestration and EGR in tight gas reservoirs were presented. Results of phase behavior testing revealed that the adsorption capacity of SCCO2 in tight sandstone is more than 50 % higher than that of natural gas in tight sandstone, and the diffusion coefficient of SCCO2 in natural gas is too low (<11.3 × 10―8 m2 s―1) for two-phase mixing in reservoir formation. Along with higher density and viscosity of SCCO2, near-piston displacement can be achieved in the case of SCCO2 injection in tight gas reservoirs, and this makes SCCO2 sequestration and EGR in tight gas reservoirs feasible. Long-core experiments using natural cores from a Dong Sheng tight gas reservoir demonstrated that SCCO2 injection can achieve significant EGR (18.9 %) based on gas depletion in tight cores, and effective storage of CO2 can be achieved simultaneously. Furthermore, several sensitivity experiments were performed, and the results demonstrated that SCCO2 EGR efficiency and the CO2 storage capacity are higher in tight gas reservoirs with lower permeability, higher water saturation, and greater dip angle.



中文翻译:

超临界CO 2隔离和致密气藏中提高气体采收率:可行性和影响效率的因素

致密的气藏由于其较差的气藏性质而总是具有较低的天然气回收率。在这种类型的储层中实现增强的气体采收率(EGR)的有效手段仍然是一项艰巨的任务。在这项研究中,提出了对致密气藏中的超临界二氧化碳(SCCO 2)隔离和EGR的实验研究。相行为测试结果表明,致密砂岩中SCCO 2的吸附能力比致密砂岩中天然气的吸附能力高50%以上,并且SCCO 2在天然气中的扩散系数太低(<11.3×10 ― 8 m 2 s ―1)在储层形成中进行两相混合。随着SCCO 2密度和粘度的增加,在致密气藏中注入SCCO 2时可以实现近活塞位移,这使得在致密气藏中进行SCCO 2隔离和EGR成为可能。使用东胜致密气藏的天然岩心进行的长岩心实验表明,基于致密岩心中的气体消耗,SCCO 2注入可以实现显着的EGR(18.9%),并且可以同时实现有效的CO 2储存。此外,进行了几次敏感性实验,结果表明SCCO 2 EGR效率和CO 2 在具有较低渗透率,较高的水饱和度和较大的倾角的致密气藏中,储层容量较高。

更新日期:2020-12-26
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