Applications of advanced petroleum production technology and water alternating gas injection for enhanced oil recovery: Mattoon Oil Field, Illinois. Fourth quarterly report, [October 1, 1993--December 31, 1993]

Abstract CO2 gas injection is one of the recommended enhanced oil recovery (EOR) methods by injecting CO2 through reservoir pores after the residual saturation is reached, since CO2 dissolves easily in oil phase as confirmed by many other researchers in pertaining field studies. An integrated system is urgently required for assessing CO2-EOR study, covering multi-disciplinary aspects as follows: geology, geophysics, reservoir, production, process and economic. Hence, those systems must be reliable in suggesting final decision for feasibility of CO2-EOR operation program, applicable either for pilot scale or for full scale. This paper is proposing an integrated system evaluation, which has the following features: (1) estimate fraction of dissolved CO2, (2) estimate viscosity reduction, (3) estimate future oil productivity index resulted, (4) forecast incremental oil production, (5) estimate surface facilities equipment design, (6) evaluate economical aspects and (7) generate final decision for feasibility of CO2-EOR operation program. Finally, as the main objective of this program, those systems will present a picture of essential reason why we need to promote or reject CO2-EOR plan program, and also some recommendations will be presented in case the CO2-EOR plan does not perform as expected.

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Enhanced oil recovery mechanism of CO 2 water-alternating-gas injection in silica nanochannel

Fuel ◽

10.1016/j.fuel.2016.11.019 ◽

2017 ◽

Vol 190 ◽

pp. 253-259 ◽

Cited By ~ 24

Author(s):

Youguo Yan ◽

Chuanyong Li ◽

Zihan Dong ◽

Timing Fang ◽

Baojiang Sun ◽

...

Keyword(s):

Enhanced Oil Recovery ◽

Oil Recovery ◽

Gas Injection ◽

Recovery Mechanism ◽

Water Alternating Gas

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Performance Quantification of Enhanced Oil Recovery Methods in Fractured Reservoirs

Energies ◽

10.3390/en14164739 ◽

2021 ◽

Vol 14 (16) ◽

pp. 4739

Author(s):

Riyaz Kharrat ◽

Mehdi Zallaghi ◽

Holger Ott

Keyword(s):

Enhanced Oil Recovery ◽

Oil Recovery ◽

Driving Forces ◽

Fractured Reservoirs ◽

Gas Injection ◽

Capillary Forces ◽

Dimensionless Numbers ◽

Water Alternating Gas ◽

Eor Processes ◽

Wag Injection

The enhanced oil recovery mechanisms in fractured reservoirs are complex and not fully understood. It is technically challenging to quantify the related driving forces and their interaction in the matrix and fractures medium. Gravity and capillary forces play a leading role in the recovery process of fractured reservoirs. This study aims to quantify the performance of EOR methods in fractured reservoirs using dimensionless numbers. A systematic approach consisting of the design of experiments, simulations, and proxy-based optimization was used in this work. The effect of driving forces on oil recovery for water injection and several EOR processes such as gas injection, foam injection, water-alternating gas (WAG) injection, and foam-assisted water-alternating gas (FAWAG) injection was analyzed using dimensionless numbers and a surface response model. The results show that equilibrium between gravitational and viscous forces in fracture and capillary and gravity forces in matrix blocks determines oil recovery performance during EOR in fractured reservoirs. When capillary forces are dominant in gas injection, fluid exchange between fracture and matrix is low; consequently, the oil recovery is low. In foam-assisted water-alternating gas injection, gravity and capillary forces are in equilibrium conditions as several mechanisms are involved. The capillary forces dominate the water cycle, while gravitational forces govern the gas cycle due to the foam enhancement properties, which results in the highest oil recovery factor. Based on the performed sensitivity analysis of matrix–fracture interaction on the performance of the EOR processes, the foam and FAWAG injection methods were found to be more sensitive to permeability contrast, density, and matrix block highs than WAG injection.

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Gas Re-Injection in the Laminaria and Corallina Fields, Timor Sea: Established Techniques, New Environmental and Commercial Benefits

Engineering Technology Conference on Energy, Parts A and B ◽

10.1115/etce2002/ee-29141 ◽

2002 ◽

Author(s):

David M. Gordon ◽

Scott A. Ryan ◽

Steve K. Twartz

Keyword(s):

Enhanced Oil Recovery ◽

Oil Recovery ◽

Emission Reduction ◽

Gas Injection ◽

Oil Field ◽

Emissions Reduction ◽

Timor Sea ◽

Operational Expenditure ◽

Offshore Oil ◽

Dual Objectives

This paper describes a gas re-injection project designed with the dual objectives of emissions reduction and enhanced oil recovery in an Australian offshore oil field. While gas injection for enhancing oil recovery is common oilfield practice, there are fewer projects that look exclusively at greenhouse gas (GHG) control (either by sequestration or emission reduction), although there is increasing environmental awareness in the industry on the benefits of doing so. The predominant contribution to total GHG CO2-e emissions is from flaring. Significant reductions in flaring have been achieved since completion of commissioning of injection. Flare CO2 emissions at the beginning of 2000 (February-March) reduced from approximately 163,000 tonnes per month to an average of approximately 26,000 tonnes per month over the remainder of 2000, and to 9,800 tonnes per month, over the first half of 2001. GHG efficiency, evident in the ratio of GHGs emitted per tonne of hydrocarbon produced, reduced from approximately 0.4 tonnes CO2-e per tonne of total hydrocarbon produced before injection to 0.08 after injection over the remainder of 2000, and to 0.06 over the first half of 2001. Miscible displacement is expected to add around 6 million barrels to ultimate recovery from the Corallina reservoir. The use of stored gas as a fuel is expected to achieve significant reductions in operational expenditure later in field life.

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