On State Constraints of Adjoint Optimization in Oil Reservoir Water-flooding

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.

Download Full-text

Adjoint-based surrogate optimization of oil reservoir water flooding

Optimization and Engineering ◽

10.1007/s11081-014-9268-4 ◽

2014 ◽

Vol 16 (2) ◽

pp. 441-481 ◽

Cited By ~ 3

Author(s):

Eka Suwartadi ◽

Stein Krogstad ◽

Bjarne Foss

Keyword(s):

Water Flooding ◽

Oil Reservoir ◽

Reservoir Water ◽

Surrogate Optimization

Download Full-text

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.

Download Full-text

Application of multi-criterion robust optimization in water-flooding of oil reservoir

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2013.07.008 ◽

2013 ◽

Vol 109 ◽

pp. 1-11 ◽

Cited By ~ 38

Author(s):

Elham Yasari ◽

Mahmoud Reza Pishvaie ◽

Farhad Khorasheh ◽

Karim Salahshoor ◽

Riyaz Kharrat

Keyword(s):

Robust Optimization ◽

Water Flooding ◽

Oil Reservoir

Download Full-text

Research Status and Prospect of Heavy Oil Recovery Technology

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.888.111 ◽

2021 ◽

Vol 888 ◽

pp. 111-117

Author(s):

Yi Zhao ◽

De Yin Zhao ◽

Rong Qiang Zhong ◽

Li Rong Yao ◽

Ke Ke Li

Keyword(s):

Oil Recovery ◽

Heavy Oil ◽

Development Trend ◽

Thermal Recovery ◽

Hot Water ◽

Water Flooding ◽

Oil Reservoir ◽

Heavy Oil Recovery ◽

Steam Flooding ◽

Heavy Oil Reservoir

With the continuous exploitation of most reservoirs in China, the proportion of heavy oil reservoirs increases, and the development difficulty is greater than that of conventional reservoirs. In view of the important subject of how to improve the recovery factor of heavy oil reservoir, the thermal recovery technology (hot water flooding, steam flooding, steam assisted gravity drainage SAGD and steam huff and puff) and cold recovery technology (chemical flooding, electromagnetic wave physical flooding and microbial flooding) used in the development of heavy oil reservoir are summarized. The principle of action is analyzed, and the main problems restricting heavy oil recovery are analyzed The main technologies of heavy oil recovery are introduced from the aspects of cold recovery and hot recovery. Based on the study of a large number of literatures, and according to the development trend of heavy oil development, suggestions and prospects for the future development direction are put forward.

Download Full-text

The Performance Evaluation of Old Well after SRV in Ordos Basin Tight Oil Reservoir

10.2118/spe-169968-ms ◽

2014 ◽

Author(s):

H.. Wang ◽

X.. Liao ◽

H.. Ye ◽

X.. Zhao ◽

C.. Liao ◽

...

Keyword(s):

Evaluation Method ◽

Ordos Basin ◽

Fracture Network ◽

Water Flooding ◽

Tight Oil ◽

Oil Reservoir ◽

Well Test ◽

Stimulated Reservoir Volume ◽

Tight Oil Reservoir ◽

Volume Fracturing

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.

Download Full-text

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.

Download Full-text