Zhao Renbao, Xu Haotian, Sun Ziqi, Shi Xiaorong, Wang Lei, Guo Wenxuan
School of Petroleum Engineering, China University of Petroleum Beijing, Changping District, Beijing102249, China.
Research Institute of Exploration and Development, Xinjiang Oilfield Company, Karamay834000, China.
ACS Omega. 2023 Jan 31;8(6):5995-6008. doi: 10.1021/acsomega.2c07914. eCollection 2023 Feb 14.
As an effective enhanced oil recovery (EOR) method in the late stage of the steam injection process, in situ combustion (ISC) has been verified by more and more researchers owing to its high recovery efficiency and low operation cost. However, the ISC process is prone to bringing about an unfavorable result with a low sweep efficiency and even an extinction process due to the complexity and uncertainty in oil and water distribution as well as the heterogeneity of the actual reservoir. In this work, combustion tube experiments combined with numerical simulations by CMG-STARS were conducted to study the influence of a reservoir's physical parameters on the stability of ISC. It was found that the sustainability of the combustion process is sensitive to permeability and oil saturation, the lower limits of which are determined as 0.2 μm and 0.2, respectively. Then, a formula was preliminarily proposed as 0.25 ≤ So/K ≤ 0.8, which could be used as a reference of screening criteria in designing the ISC process.
作为蒸汽注入过程后期一种有效的提高采收率（EOR）方法，就地燃烧（ISC）因其采收率高和运营成本低而得到越来越多研究人员的验证。然而，由于实际油藏中油水分布的复杂性和不确定性以及非均质性，ISC过程容易导致波及效率低的不利结果，甚至出现熄火过程。在这项工作中，进行了燃烧管实验并结合CMG-STARS数值模拟，以研究油藏物理参数对ISC稳定性的影响。研究发现，燃烧过程的可持续性对渗透率和含油饱和度敏感，其下限分别确定为0.2μm和0.2。然后，初步提出一个公式0.25≤So/K≤0.8，可作为设计ISC过程时筛选标准的参考。
