CO2-Based Enhanced Oil Recovery from Unconventional Reservoirs: A Case Study of the Bakken Formation

2014 ◽  
Author(s):  
G. Liu ◽  
J.A. Sorensen ◽  
J.R. Braunberger ◽  
R. Klenner ◽  
J. Ge ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Unconventional Reservoirs ◽  
Bakken Formation

scholarly journals Multi-Objective Optimization of Microemulsion Flooding for Chemical Enhanced Oil Recovery

2018 ◽  
Vol 73 ◽  
pp. 4 ◽  
Author(s):  
Mohammad Saber Karambeigi ◽  
Ali Haghighi Asl ◽  
Masoud Nasiri
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Unconventional Reservoirs ◽  
Residual Oil ◽  
Multi Objective Optimization ◽  
Microemulsion Formulation ◽  
Multi Objective ◽  
Conflicting Objectives ◽  
Single Objective

Microemulsion flooding is one of the most effective methods of Chemical Enhanced Oil Recovery (CEOR), particularly for the production of residual oil trapped in unconventional reservoirs. A critical step for successful application of this technique is to achieve a suitable formulation. Previous studies have almost focused on the technical aspects while considering both practical and economic matters as conflicting objectives has been neglected. In the present paper, the formulation of microemulsion is optimized based on the trade-off between scientific and financial responses using a hybrid workflow in which experimental design and artificial intelligence methodologies are composed. To appraise the efficiency of developed algorithm, a challenge case study is first evaluated and compared to previous approaches. Thereafter, the second case is examined in which a newly developed formulation of microemulsion for high temperature carbonate reservoirs is optimized. The outcomes of this multi-attribute workflow are compared to a single-objective algorithm. The results indicate the outstanding performance of the proposed approach for multi-objective optimization of microemulsion formulation. Eventually, the possible concerns regarding the application of microemulsion flooding in unconventional reservoirs are discussed.

Improved Fluids Characterization Model During Gas Huff-n-Puff EOR Processes in Unconventional Reservoirs

2021 ◽  
Author(s):  
Gang Yang ◽  
Xiaoli Li
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Fluid Model ◽  
Geometric Constraints ◽  
Confinement Effect ◽  
Recovery Factor ◽  
Unconventional Reservoirs ◽  
Compositional Simulation ◽  
Compositional Model ◽  
Characterization Model

Abstract Despite the great potential of unconventional hydrocarbons, the primary recovery factor from such reservoirs remain low. The gas-injection enhanced oil recovery (EOR) has been proved to be a promising approach by both laboratory and simulation studies. However, the fluid model for characterizing gas and oil in nanoscale pores has not been well understood and developed. Erroneous results can be generated if the bulk fluids model is applied, resulting in a large uncertainty for the numerical simulations. The objective of this work is to propose an improved fluids characterization model tailored for the compositional simulation of gas huff-n-puff in unconventional reservoirs. The Peng-Robinson equation of state (PR EOS) is used as the basic thermodynamic model in this work. Both the attraction parameter and the co-volume parameter in the PR EOS are simultaneously modified for the first time to reflect the effect of molecule-wall interaction and geometric constraints. The collected experimental data are used for validating the model. The newly generated PVT data are imported into the compositional model to numerically simulate the gas huff-n-puff process in the Middle Bakken formation to investigate the influence of modified fluid property on the production and ultimate recovery. The improved fluids characterization model is validated applicable to calculate the confined properties of reservoir fluids. It is demonstrated that the phase envelope of the confined reservoir fluids tends to shrink. At reservoir temperature, the bubble-point pressure of the Middle Bakken oil is reduced by 17.32% with consideration of the confinement effect. Such a significant suppression represents a late occurrence of the gas evaporation, which implies a potentially higher production of the shale oil reservoir. Compositional simulation predicts that the enhanced oil recovery efficiency of CO2 huff-n-puff is unsatisfactory for the specific well in this work, which is also demonstrated in the field pilot test. However, the confinement effect results in a 1.14% elevation of the oil recovery factor in 10 years production. This work not only deepens our understanding of the confinement effect on phase behavior characterization and also shed light on the computation of the thermodynamic properties of hydrocarbons in nanopores. The results also provide practical instructions for the EOR development of unconventional reservoirs.

Evaluation of CO2 enhanced oil recovery in unconventional reservoirs: Experimental parametric study in the Bakken

Fuel ◽  
2022 ◽  
Vol 312 ◽  
pp. 122941
Author(s):  
Nidhal Badrouchi ◽  
Hui Pu ◽  
Steven Smith ◽  
Foued Badrouchi
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Parametric Study ◽  
Unconventional Reservoirs

Alkyl Polyglycoside/1-Naphthol Formulations: A Case Study of Surfactant Enhanced Oil Recovery

2011 ◽  
Vol 48 (2) ◽  
pp. 121-126 ◽  
Author(s):  
S. Iglauer ◽  
Y. Wu ◽  
P. Shuler ◽  
Y. Tang ◽  
W. A. Goddard
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Alkyl Polyglycoside
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