考虑封存机理的低渗透油藏CO2驱油与封存注采参数敏感性分析

doi:10.7657/XJPG20240610

摘要/Abstract

摘要：

低渗透油藏采用CO₂驱油，既可以提高油气采收率，又能实现CO₂地质封存。基于CO₂封存机理，采用数值模拟方法，建立了考虑CO₂构造封存、束缚封存和溶解封存的驱油与封存机理模型，研究在连续注气开发和水气交替注入开发下，不同注采参数（注水年限、CO₂注入速度、注采比、生产井井底流压下限、注入井井底流压上限、循环次数和气水段塞比）对低渗透油藏CO₂驱油采收率与CO₂封存效率的敏感性。结果表明：CO₂封存机理会对CO₂驱油以及CO₂封存造成很大的影响。连续注气开发时，CO₂束缚封存有利于驱油，但对CO₂封存影响不大；CO₂溶解封存不利于CO₂驱油，但是有利于CO₂封存。水气交替注入开发时，CO₂封存机理不利于CO₂驱油，但是对CO₂封存有促进作用。研究结果可揭示不同CO₂注入方式下，封存机理对驱油与封存的影响规律。

关键词: 低渗透油藏, CO₂驱油, CO₂封存, 封存机理, 连续注气开发, 水气交替注入开发, 提高采收率, 数值模拟

Abstract:

In low-permeability reservoirs, CO₂ flooding can enhance oil recovery and achieve CO₂ geological storage. Based on the CO₂ storage mechanisms, by using a numerical simulation method, a CO₂ EOR and storage model considering CO₂ structural storage, residual storage, and dissolution storage mechanisms was established. This model was used to analyze the sensitivity of injection-production parameters (e.g. water injection period, CO₂ injection rate, injection-production ratio, lower limit of bottomhole flowing pressure in production wells, upper limit of bottomhole flowing pressure in injection wells, number of cycles, and gas-to-water slug ratio) on CO₂ EOR and CO₂ storage efficiency in low-permeability reservoirs under continuous gas injection and water-alternating-gas (WAG) injection modes. The results demonstrate that CO₂ storage mechanisms have significant impacts on both CO₂ EOR and CO₂ storage. Under the mode of continuous gas injection, CO₂ residual storage aids CO₂ EOR but has minimal effect on CO₂ storage, while dissolution storage hinders CO₂ EOR but benefits CO₂ storage. Under the mode of WAG injection, the storage mechanisms are less favorable for CO₂ EOR but promote CO₂ storage. These findings reveal the influences of storage mechanisms on CO₂ EOR and storage under different injection modes.

Key words: low-permeability reservoir, CO₂ EOR, CO₂ storage, storage mechanism, continuous gas injection, WAG injection, enhanced oil recovery, numerical simulation

中图分类号:

TE348
TE357

李远铎, 丁帅伟, 张蒙, 许川, 樊纹宇, 屈传超. 考虑封存机理的低渗透油藏CO₂驱油与封存注采参数敏感性分析[J]. 新疆石油地质, 2024, 45(6): 711-718.

LI Yuanduo, DING Shuaiwei, ZHANG Meng, XU Chuan, FAN Wenyu, QU Chuanchao. Sensitivity Analysis on Injection-Production Parameters for CO₂ EOR and Storage in Low-Permeability Reservoirs Considering Storage Mechanism[J]. Xinjiang Petroleum Geology, 2024, 45(6): 711-718.

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CO₂封存机理	作用机制	表征方法	参数来源
构造封存	气水重力差异	通过PR3方程建立三维油藏组分模拟模型	原油高压物性相态拟合实验
束缚封存	相渗滞后、毛细管力滞后	通过Killough模型建立相渗滞后曲线以及毛细管力滞后曲线	油气水相渗驱替曲线
溶解封存	CO₂溶解、CO₂扩散	通过Duan模型建立CO₂溶解度模型及实验获得CO₂扩散系数	地层水矿化度、CO₂扩散系数实验

研究区层位	数值模型层位	平均孔隙度/ %	平均渗透率/ mD
长61 2小层	1—2	7.34	1.21
长62 2小层	3—5	6.98	0.90
长63 2小层	6—8	6.94	0.96
长64 2小层	9—10	7.79	1.55

考虑封存机理的低渗透油藏CO₂驱油与封存注采参数敏感性分析

Sensitivity Analysis on Injection-Production Parameters for CO₂ EOR and Storage in Low-Permeability Reservoirs Considering Storage Mechanism

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