Characteristics and influencing factors of CO2 flooding in different microscopic pore structures in tight reservoirs

被引：0

作者：

Huang X. ^{[1
]}

Ni J. ^{[2
]}

Li X. ^{[3
]}

Xue J. ^{[1
]}

Bai M. ^{[1
,4
]}

Zhou T. ^{[5
]}

机构：

[1] School of Petroleum Engineering, Xi'an Shiyou University, Xi'an, 710065, Shaanxi

[2] Research Institute of Shaanxi, Yanchang Petroleum (Group)Co., Ltd., Xi'an, 710075, Shaanxi

[3] School of Petroleum Engineering, The University of Tulsa, Tulsa, 74104, OK

[4] School of Petroleum Engineering, Northeast Petroleum University, Daqing, 163318, Heilongjiang

[5] Sinopec Petroleum Exploration and Production Research Institute, Beijing

来源：

Huang, Xing (hx@xsyu.edu.cn) | 1600年 / Science Press卷 / 41期

关键词：

CO[!sub]2[!/sub] flooding; Microscopic pore structure; Nuclear magnetic resonance; Oil displacement efficiency; Tight sandstone;

D O I：

10.7623/syxb202007007

中图分类号：

学科分类号：

摘要：

The microscopic pore structures of tight sandstone reservoirs have a significant impact on the CO2 flooding characteristics. Based on the experimental results from thin section analysis, SEM, high-pressure mercury injection and NMR testing, this paper establishes a classification standard for the microscopic pore structures of the Chang 8 oil-bearing formation in Jiyuan oilfield, carries out CO2 flooding experiment under different displacement pressures using the representative core samples of each type of reservoir, and in combination with NMR T2 spectroscopy, studies the displacement characteristics of crude oil in macro and small pores under various displacement pressures in reservoirs of 3 types of pore structures, and detailedly analyzes the effect of reservoir physical property, pore structure and clay minerals on CO2 flooding efficiency. The results show that the pore structure of Chang 8 reservoir in the study area can be divided into type I, Ⅱ and Ⅲ. The reservoir space and percolation ability corresponding to the three types of pore structures decrease successively. Type Ⅱ reservoir has the largest miscible CO2 flooding efficiency, and type Ⅲ reservoir has the largest immiscible CO2 flooding efficiency; the displacement characteristics of crude oil in pore throats with different pore sizes vary greatly with different displacement pressure and various types of reservoir pore structures. Immiscible CO2 flooding efficiency has a good correlation with rock permeability, pore throat radius, sorting coefficient and clay mineral content, while the level of miscible CO2 flooding efficiency is related to pore structure parameters and clay mineral content. As the main production potential tapping horizon in the future, type Ⅱ reservoir is more suitable for CO2 flooding. These achievements provide a method and basis for the reasonable and efficient CO2 flooding of Chang 8 reservoir in Jiyuan oilfield. © 2020, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：853 / 864

页数：11

共 25 条

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