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通过二氧化碳混相驱提高低渗透油藏采收率：机理与动态

Enhancing Oil Recovery in Low Permeability Reservoirs through CO Miscible Flooding: Mechanisms and Dynamics.

作者信息

Chen Xinliang, Yang Zhengming, Yu Hongwei, Niu Zhongkun, Li Wen, Jia Ninghong, Wang Wenming, Zhang Yapu, Li Haibo, Chang Yilin

机构信息

School of Engineering Science, University of Chinese Academy of Science, Beijing 100049, China.

Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.

出版信息

ACS Omega. 2024 Dec 3;9(50):49336-49347. doi: 10.1021/acsomega.4c06509. eCollection 2024 Dec 17.

DOI:10.1021/acsomega.4c06509
PMID:39713678
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11656228/
Abstract

Understanding the dynamic characterization of the CO miscible flooding process in low permeability reservoirs and its mechanism for oil recovery enhancement is crucial for controlling CO miscible flooding sweep efficiency and further enhancing oil recovery. This study was conducted in a low permeability reservoir in Jilin, China, using both online nuclear magnetic resonance CO miscible flooding and long-core CO miscible flooding experiments. A refined dynamic characterization of the CO miscible flooding process from the macroscopic core scale to the microscopic pore scale was achieved through multiple spatial online nuclear magnetic resonance testing methods. Analysis of dynamic characteristics of physical parameters was based on long-core displacement experiments and gas chromatography. This study summarizes the influence mechanism of CO miscible flooding on enhanced oil recovery in low permeability reservoirs and demonstrates the feasibility of CO miscible flooding. The results indicated that (1) CO miscible flooding enables simultaneous oil recovery from micro-, meso-, and macropores, significantly improving displacement efficiency. (2) The recovery process unfolds in two stages: the initial CO miscible flooding stage before gas breakthrough and the subsequent CO miscible transport stage after gas breakthrough. (3) Both stages are instrumental in expanding the macroscopic swept range of CO, thereby enhancing oil recovery. (4) The miscibility of CO with crude oil can affect the oil's composition. (5) The combined effect of miscible flooding and transport underpins the high displacement efficiency of CO miscible flooding. Emphasizing these critical aspects could enhance oil recovery from CO miscible flooding in field production.

摘要

了解低渗透油藏中CO混相驱替过程的动态特征及其提高采收率的机理，对于控制CO混相驱扫油效率和进一步提高采收率至关重要。本研究在中国吉林的一个低渗透油藏中进行，采用了在线核磁共振CO混相驱替和长岩心CO混相驱替实验。通过多种空间在线核磁共振测试方法，实现了从宏观岩心尺度到微观孔隙尺度的CO混相驱替过程的精细动态表征。基于长岩心驱替实验和气相色谱法对物理参数的动态特征进行了分析。本研究总结了CO混相驱替对低渗透油藏提高采收率的影响机理，并证明了CO混相驱替的可行性。结果表明：（1）CO混相驱替能够同时从微孔、中孔和大孔中采出原油，显著提高驱替效率。（2）采收过程分为两个阶段：气窜前的初始CO混相驱替阶段和气窜后的后续CO混相运移阶段。（3）两个阶段都有助于扩大CO的宏观波及范围，从而提高采收率。（4）CO与原油的混相性会影响原油的组成。（5）混相驱替和运移的综合作用是CO混相驱替高驱替效率的基础。强调这些关键方面可以提高现场生产中CO混相驱替的采收率。

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