页岩油藏注CO2驱孔隙动用特征研究

doi:10.13809/j.cnki.cn32-1825/te.2024.01.006

摘要/Abstract

摘要：

CO₂在页岩油藏驱油时的孔隙动用特征是评价其应用于提高页岩油藏采收率效果的一项重要指标。因此，开展了超临界CO₂驱替页岩岩心室内实验，并以核磁共振（NMR）在线岩心扫描技术为手段对CO₂驱页岩油藏的孔隙动用特征和规律进行研究。结果表明，超临界CO₂非混相驱油主要动用页岩中孔隙半径在0.1~3.0 μm范围内的油，而此过程中小于0.008 μm孔隙半径内的油量反而增加，分析原因主要是CO₂在页岩层中通过压差和扩散作用将大孔隙内页岩油带入小孔隙中并发生吸附滞留，在驱替时间5 h后，CO₂驱替页岩油采收率达到35.7%，驱油效果较好。

关键词: 超临界CO₂, 页岩油, 核磁共振, 孔隙动用特征, 采收率

Abstract:

The pore utilization characteristics of CO₂ during shale oil displacement are a crucial indicator for evaluating its effectiveness in enhancing shale oil reservoir recovery rates. Therefore, experiments on supercritical CO₂ displacing shale cores were conducted in the laboratory, and nuclear magnetic resonance（NMR） online core scanning technology was used to study the pore utilization characteristics and patterns of CO₂ displacement in shale oil reservoirs. The results indicate that immiscible flooding by supercritical CO₂ mainly develops the oil in shale pores with radius of 0.1~3.0 μm, but the oil content in pore radius less than 0.008 μm actually increases. The analysis shows that CO₂ brings shale oil from large pores into small pores through pressure difference and diffusion effect in the shale layer and makes oil undergo adsorption and retention. After a displacement time of five hours, the recovery rate of shale oil by CO₂ displacement reached 35.7%, indicating a relatively effective oil displacement result.

Key words: supercritical CO₂, shale oil, nuclear magnetic resonance, pore development characteristic, oil recovery

中图分类号:

TE357

张志超,柏明星,杜思宇. 页岩油藏注CO₂驱孔隙动用特征研究[J]. 油气藏评价与开发, 2024, 14(1): 42-47.

ZHANG Zhichao,BAI Mingxing,DU Siyu. Characteristics of pore dynamics in shale reservoirs by CO₂ flooding[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 42-47.

图/表 4

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页岩油藏注CO₂驱孔隙动用特征研究

Characteristics of pore dynamics in shale reservoirs by CO₂ flooding

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