REVIEW ON CO2/CH4 ADSORPTION AND DISPLACEMENT CHARACTERISTICS OF MICRO-NANO PORES IN SHALE RESERVOIR
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摘要: 利用CO2开采页岩气不仅能够提高页岩气采收率, 还能够节省水资源并且对CO2进行地质封存, 有助于实现页岩气开采过程的碳中和. 富有机质页岩储层纳微米孔隙中气体运移机制不同于常规储层, CO2在储层中具有超临界特性, 致使开采机理复杂, 无法得到CO2开采页岩气微观机理的准确认识, 所以研究CH4, CO2及其二元混合物在页岩储层纳微米孔隙中的吸附及驱替特性对准确评估和高效开采页岩气至关重要. 本文从实验、理论以及模拟方面对页岩储层纳微米孔隙中CH4的吸附特性、CO2/CH4二元混合物竞争吸附特性以及驱替特性进行了综合分析, 对气体在纳微米孔隙中吸附及驱替特性的基础研究及关键问题进行讨论分析并提出了展望. 研究表明CH4在页岩储层中表现为物理吸附, 有机质特征(丰度、成熟度、类型)、孔隙结构、无机矿物组成、温度和压力、含水率对页岩的CH4吸附能力均有一定程度的影响. 在相同条件下, CO2比CH4更易被页岩储层吸附, 在页岩储层中注入CO2可以促进CH4的解吸, 并有利于CO2的地质埋存. 开采方案的部署可采用井网形式的注采方式, 可以通过调整注入井的位置、数量以及CO2注入速率对开采方案进行优化.Abstract: Using CO2 to produce shale gas can not only improve shale gas recovery, but also save water resources and carry out geological storage of CO2, which is helpful to achieve carbon neutrality in shale gas production process. The gas migration mechanism in micro-nano pores of organic-rich shale reservoir is different from that of conventional reservoir. CO2 has supercritical properties in the reservoir, which makes the exploitation mechanism complicated and it is impossible to obtain an accurate understanding of the microscopic mechanism of CO2 exploitation of shale gas. Therefore, it is very important to study the adsorption and displacement characteristics of CH4, CO2 and their binary mixtures in micro-nano pores of shale reservoir for accurate evaluation and efficient exploitation of shale gas. In this paper, review on the adsorption properties of CH4, CO2/CH4 binary mixture competitive adsorption and displacement properties in micro-nano pores of shale reservoir were carried out from three aspects: experiment, basic theory and numerical simulation. The key question and research trend on the CO2/CH4 adsorption and displacement characteristics of micro-nano pores in shale reservoir has been discussed. The results show that CH4 is physically adsorbed in shale reservoirs, and the characteristics of organic matter (abundance, maturity and type), pore structure, inorganic mineral composition, temperature and pressure, and water content all have a certain degree of influence on CH4 adsorption capacity of shale. Under the same conditions, CO2 is more easily adsorbed by shale reservoir than CH4. Injecting CO2 into shale reservoir can promote the desorption of CH4 and facilitate the geological storage of CO2. The deployment of the production plan can adopt the injection production method in the form of well pattern. The production plan can be optimized by adjusting the location, number and CO2 injection rate of injection wells.
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Key words:
- shale /
- micro-nano pore /
- CO2/CH4 /
- adsorption /
- displacement
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图 6 (a)注气后22 m厚储层混合区域的分布; (b)不考虑重力影响, 注气后22 m厚储层混合区域的分布; (c)注气后50 m厚储层混合区分布; (d)注气后100 m厚储层混合区分布[82]
Figure 6. (a) The distribution of the 22 m thick reservoir mixing zone after gas injection. (b) The distribution of the mixing zone of 22 m thick reservoir after gas injection without considering the influence of gravity. (c) The distribution of the 50 m thick reservoir mixing zone after gas injection. (d) The distribution of the 100 m thick reservoir mixing zone after gas injection[82]
图 7 (a)三维模拟结果的平面. IW和PW分别表示注入井和生产井的位置; (b)超临界层状油藏模拟基本情况的成分分布的时间演化[83]
Figure 7. (a) 3D simulation results of the plane. IW and PW represent the location of the injection and production well. (b) Temporal evolution of component distribution in a supercritical layered reservoir simulation base case[83]
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