Corrigendum to “Evaluation of enhanced oil recovery potential using gas/water flooding in a tight oil reservoir” [Fuel 272 (2020) 117706]

Abstract The technology of Stimulated reservoir volume (SRV) has been the key technology for unconventional reservoir development, it can create fracture network in formation and increase the contact area between fracture surface and matrix, thus realizing the three-dimensional stimulation and enhancing single well productivity and ultimate recovery. In China, the Ordos Basin contains large areas of tight oil reservoir with the porosity of 2~12 % and permeability of 0.01~1 mD. The most used development mode is conventional fracturing and water flooding, which is different from the natural depletion mode in oversea, but the development effect is still unfavorable. The idea of SRV is proposed in nearly two years in Changqing Oilfield. SRV measures are implemented in some old wells in tight oil formation. It is a significant problem that should be solved urgently about how to evaluate the volume fracturing effect. Based on the real cases of old wells with SRV measures, the microseismic monitoring is used to analyze the scale of formation stimulation and the complexity of fracture network after volume fracturing; the numerical well test and production data analysis (PDA) are selected to explain the well test data, to analyze the dynamic data, and to compare the changes of formation parameters, fluid parameters and plane streamlines before and after volume fracturing; then the interpretation results of well test with the dynamic of oil and water wells are combined to evaluate the stimulation results of old wells after SRV. This paper has presented a set of screening criteria and an evaluation method of fracturing effect for old well with SRV in tight oil reservoir. It will be helpful to the selection of candidate well and volume fracturing operation in Ordos Basin tight oil reservoir. It should be noted that the evaluation method mentioned in the paper can be expanded to volume stimulation effect evaluation in other unconventional reservoirs, such as tight gas, shale gas and so on.

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Low-Abundance Dietzia Inhabiting a Water-Flooding Oil Reservoir and the Application Potential for Oil Recovery

BioMed Research International ◽

10.1155/2019/2193453 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11

Author(s):

Peike Gao ◽

Hongbo Wang ◽

Guanxi Li ◽

Ting Ma

Keyword(s):

Oil Recovery ◽

Water Flooding ◽

Oil Reservoir ◽

Displacement Efficiency ◽

Oil Displacement ◽

Recovery Potential ◽

Oil Displacement Efficiency ◽

Application Potential ◽

Nutrient Injection

With the development of molecular ecology, increasing low-abundance microbial populations were detected in oil reservoirs. However, our knowledge about the oil recovery potential of these populations is lacking. In this study, the oil recovery potential of low-abundance Dietzia that accounts for less than 0.5% in microbial communities of a water-flooding oil reservoir was investigated. On the one hand, Dietzia sp. strain ZQ-4 was isolated from the water-flooding reservoir, and the oil recovery potential was evaluated from the perspective of metabolisms and oil-displacing test. On the other hand, the strain has alkane hydroxylase genes alkB and P450 CYP153 and can degrade hydrocarbons and produce surfactants. The core-flooding test indicated that displacing fluid with 2% ZQ-4 fermentation broth increased 18.82% oil displacement efficiency, and in situ fermentation of ZQ-4 increased 1.97% oil displacement efficiency. Furthermore, the responses of Dietzia in the reservoir accompanied by the nutrient stimulation process was investigated and showed that Dietzia in some oil production wells significantly increased in the initial phase of nutrient injection and sharply decreased along with the continuous nutrient injection. Overall, this study indicates that Dietzia sp. strain has application potential for enhancing oil recovery through an ex situ way, yet the ability of oil recovery in situ based on nutrient injection is limited.

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A Novel Enhanced Oil Recovery Approach to Water Flooding in Saskatchewan’s Tight Oil Plays

Proceedings of the 7th Unconventional Resources Technology Conference ◽

10.15530/urtec-2019-419 ◽

2019 ◽

Cited By ~ 1

Author(s):

Mojtaba Kiani ◽

Tzu-Ping Hsu ◽

Alireza Roostapour ◽

Mahdi Kazempour ◽

Eric Tudor

Keyword(s):

Enhanced Oil Recovery ◽

Oil Recovery ◽

Water Flooding ◽

Tight Oil ◽

Recovery Approach

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A New Methodology for the Multilayer Tight Oil Reservoir Water Injection Efficiency Evaluation and Real-Time Optimization

Geofluids ◽

10.1155/2020/8854545 ◽

2020 ◽

Vol 2020 ◽

pp. 1-17

Author(s):

Lin Cao ◽

Jianlong Xiu ◽

Hongjie Cheng ◽

Hui Wang ◽

Shujian Xie ◽

...

Keyword(s):

Water Injection ◽

Sedimentary Facies ◽

Production Performance ◽

Water Flooding ◽

Tight Oil ◽

Oil Reservoir ◽

Reservoir Water ◽

Injection Efficiency ◽

Tight Oil Reservoir ◽

Channel Bar

It is important to determine the reasonable injection and production rates in the development of multilayer tight oil reservoir with water flooding treatment. Based on the INSIM (interconnection-based numeric simulation model), a connected network model, a new method is designed to evaluate the water injection efficiency of different layers in water flooding reservoirs and to optimize the injection-production system to produce more oil. Based on the types of sedimentary facies and corresponding injection-production data, the interwell connections are divided into four major categories (middle channel, channel edge, middle channel bar, and channel bar edge) and twelve subclasses. This classification standard of interwell connections could help to significantly improve the accuracy of judging the dominant flow path without constructing a complicated geological model. The interaction of interwells such as injection-production correlation and water injection efficiency could be revealed by simulating the production performance and computing the layer dividing coefficient and well dividing coefficient. A numerical example is used to validate this method by comparing results from FrontSim and this method, and the computational efficiency of this method is several dozen times faster than that of the traditional numerical simulation. This method is applied to quickly optimize the production schedule of a tight oil reservoir with the water flooding treatment, that is, the water injection rate of multilayer reservoirs could be optimized subtly by the injection efficiency of different layers, and the target of producing more oil with lower water cut could be achieved.

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Improved Characterization and Modeling of Tight Oil Formations for CO2 Enhanced Oil Recovery Potential and Storage Capacity Estimation

10.2172/1425210 ◽

2018 ◽

Author(s):

James Sorensen ◽

Steven Smith ◽

Bethany Kurz ◽

Steven Hawthorne ◽

Lu Jin ◽

...

Keyword(s):

Enhanced Oil Recovery ◽

Oil Recovery ◽

Storage Capacity ◽

Tight Oil ◽

Capacity Estimation ◽

Recovery Potential ◽

And Storage

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Parameters for Assessing Oil Reservoir Water Flooding Additives

Journal of Fluids Engineering ◽

10.1115/1.3077142 ◽

2009 ◽

Vol 131 (3) ◽

Cited By ~ 4

Author(s):

Nico Reuvers ◽

Michael Golombok

Keyword(s):

Fluid Flow ◽

Shear Rate ◽

Enhanced Oil Recovery ◽

Oil Recovery ◽

Water Flooding ◽

Low Permeability ◽

Oil Reservoir ◽

Reservoir Water ◽

Figures Of Merit ◽

Relative Retardation

This paper is concerned with deriving parameters for assessing the effectiveness of fluid additives to improve water flooding during enhanced oil recovery. We focus particularly on the use of rheological modifiers, which do not show monotonic behavior with the shear rate within the rock pores. We derive figures of merit based on (1) relative retardation in high and low permeability rock, (2) profile flattening, and (3) injectivity index. Only the last of these provides a measure of water flood profile improvement while maintaining sufficient fluid flow and production levels.

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