scholarly journals Retraction: Laboratory research of wettability and heterogeneity effect on microscopic residual oil distribution in tight sandstone cores during CO2 flooding (IOP Conf. Ser.: Earth Environ. Sci. 208 012065)

2018 ◽  
Vol 208 (1) ◽  
pp. 012123
Author(s):  
Baoquan Zeng ◽  
Hui Xu ◽  
Tailai Qu ◽  
Haixia Xu ◽  
Shucheng Wu ◽  
...  
Keyword(s):  
Laboratory Research ◽  
Co2 Flooding ◽  
Residual Oil ◽  
Tight Sandstone ◽  
Oil Distribution

scholarly journals Quantitative Study of Residual Oil Distribution during Water Flooding through Digital Core Analysis

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xuechao Liu ◽  
Dazhong Ren ◽  
Fengjuan Dong ◽  
Junxiang Nan ◽  
Ran Zhou
Keyword(s):  
Ct Scanning ◽  
Water Flooding ◽  
Fluid Distribution ◽  
Core Analysis ◽  
Residual Oil ◽  
Tight Sandstone ◽  
Oil Storage ◽  
Oil Distribution ◽  
Distribution Features ◽  
Digital Core

The character of residual oil formed during water flooding, one important technique to enhance oil recovery, is helpful to further study permeability and recovery in tight sandstone oil reservoirs. In this paper, we take a tight sandstone reservoir in Ordos Basin as the research object and use in situ displacement X-CT scanning technology to analyze the dynamic characteristics of oil during water flooding. Firstly, core pore radius and oil storage space radius were measured from digital cores which are acquired in different water flooding stages by X-CT scanning technology. Secondly, analytical and evaluation methods were established to describe fluid distribution in the pore space of the core in different water flooding stages based on curve similarity. Finally, by numerical results, we analyzed the oil distribution features in the process of water flooding for core samples. In this paper, the oil distribution characteristics during water flooding are revealed based on digital core analysis. Also, a quantitative evaluation method is given to provide theoretical guidance.

scholarly journals Micropore structure and water driving characteristics of tight sandstone reservoirs in Ordos Basin

2021 ◽  
Author(s):  
Shuxun Zhou ◽  
Yan Zhou ◽  
Jian Shi ◽  
Yujie Zhu ◽  
Wulin Xiao ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Residual Oil ◽  
Key Factors ◽  
Tight Sandstone ◽  
Micropore Structure ◽  
Oil Distribution ◽  
Sandstone Reservoir ◽  
Thin Section Analysis ◽  
Major Target ◽  
Section Analysis

AbstractIn order to explore the influence of the micropore structure of the tight sandstone reservoir in the water driving characteristics, the studies on the Chang 6 tight sandstone reservoir of the middle-western part of Ordos Basin are carried out by various experiments such as cast-thin section analysis, scanning electron microscopy, high-pressure mercury injection and micro-water driving. The result shows that the permeability contribution curves of samples shift to the left as the sample permeability decreases, indicating that the greater the permeability, the greater the proportion of large pores. The permeability is mostly dominated by pores with the radius larger than R50–R60. There are big differences in the water driving type, oil-driven efficiency and residual oil distribution characteristics between reservoirs of different types. The type II reservoir is the major target of subsequent exploration and development, where water driving types consist of mesh and finger, leaving the residual oil mainly locked by water or isolated as oil drops. The size and distribution feature of pores are the key factors dominating the oil-driven efficiency.

Study on Flow Units and Residual Oil Distribution of Lower S2 Formation in Wen-X Fault Block, Wenliu Oilfield

2012 ◽  
Vol 524-527 ◽  
pp. 217-220
Author(s):  
Min An Tang ◽  
Bao Ling Sun ◽  
Huan Yan Xu
Keyword(s):  
Flow Index ◽  
Lateral Heterogeneity ◽  
Simulation Approach ◽  
Residual Oil ◽  
Flow Units ◽  
The Poor ◽  
Fault Block ◽  
Oil Distribution ◽  
Barrier Type ◽  
D Model

Flow units are divided into E,G and P types for the Lower S2reservoir of Wen-X fault block in the Wenliu Oilfield, which are identificated based on six parameters including porosity, permeability, sandstone thickness, effective thickness, formation conductivity and flow index. A 3-D model for the flow units is established by sequential gaussian stochastic simulation approach. It is believed that type- E flow units are well exploited, with the distribution of the remaining oils related to fault as a barrier；type-G flow units are less exploited, with enrichment of remaining oil, due to the influence of interlayer or lateral heterogeneity；and type-P flow units are difficult to be exploited because of the poor percolation and a lower reserves abundance

scholarly journals Solid-Liquid Interfacial Effects on Residual Oil Distribution Utilizing Three-Dimensional Micro Network Models

Energies ◽  
2017 ◽  
Vol 10 (12) ◽  
pp. 2059 ◽  
Author(s):  
Weiyao Zhu ◽  
Bingbing Li ◽  
Yajing Liu ◽  
Hongqing Song ◽  
Xiaofeng Wang
Keyword(s):  
Three Dimensional ◽  
Network Models ◽  
Residual Oil ◽  
Interfacial Effects ◽  
Oil Distribution ◽  
Solid Liquid

Residual Oil Distribution Law and Controlling Factors of Chang 6 Reservoir in Liutai Area

2014 ◽  
Vol 1010-1012 ◽  
pp. 1735-1739
Author(s):  
Feng Run Zhang ◽  
Ai Hua Guo ◽  
Huai En Cai
Keyword(s):  
Sedimentary Facies ◽  
Geological Structure ◽  
Controlling Factors ◽  
Water Flooding ◽  
Residual Oil ◽  
Distribution Law ◽  
Total Recovery ◽  
Main Layer ◽  
Oil Distribution ◽  
Distribution Laws

Because of the high heterogeneity, late water flooding and irregular well network, the distribution law of residual oil reserve in Chang 6 reservoir becomes much complicated. Combining the geology with dynamics of the reservoir, volumetric and formation coefficient methods are adapted to calculated the residual reserves, and then the distribution laws and controlling factors are analyzed. The results indicate that: there are still large amounts of residual reserve in main layer Chang 622; the residual reserve can be classified into three kinds, Class I and class II are distributed concentrative in main layer; the controlling factors include property, sedimentary facies, heterogeneity, well network controlling and geological structure and so on. Finally, according to the distribution laws and controlling factors, targeted measures are proposed. The studying results provide well foundations for improving recovery of residual oil reserves and the total recovery of the reservoir.

scholarly journals The residual oil distribution regularity of low permeability oilfield

Petroleum ◽  
2015 ◽  
Vol 1 (2) ◽  
pp. 112-117
Author(s):  
Huan Zhao ◽  
Hongjun Yin
Keyword(s):  
Low Permeability ◽  
Residual Oil ◽  
Oil Distribution
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