Huff-n-Puff Test For Minimum Miscibility Pressure Determination For Heavy Oil

Shilov, Evgeny

doi:10.3997/2214-4609.201802977

Cited by 2 publications

(2 citation statements)

References 9 publications

(16 reference statements)

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“…The minimum miscibility pressure (MMP) is a crucial parameter in identifying whether a miscible gas drive is possible in a given reservoir or not. The reservoir pressure must usually be near or above the MMP value to achieve good displacement efficiency [41][42][43]. Miscible gas EOR, in comparison with immiscible, is effective and low-cost and yields significant economic benefits [44].…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Studies on Minimum Miscibility Pressure for n-Decane and CO2

et al. 2023

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Oil production is a complex process that can be made more efficient by applying gas enhanced oil recovery (EOR) methods. Thus, it is essential to know the minimum miscibility pressure (MMP) and minimum miscibility enrichment (MME) of gas in oil. Conventional slim-tube experiments for the measurement of MMP require hundreds of millilitres of real or recombined oil and last over 30 days. Advances in microfluidic technology allow the reduction of the amount of fluid and the time required in determining MMP (or MME), hence making the process rapid. In this study, we developed a microfluidic model with a stochastically distributed pore network, porosity of 74.6% and volume of 83.26 nanolitres. Although the volume was six orders of magnitude smaller than the slim tube, it retained the same proportions, guaranteeing a proper comparison between the tests. This microfluidic chip allowed the study of the MMP of n-decane with carbon dioxide at two different temperature conditions. The experimental results coincided with the results received both from conventional and microfluidic experiments. Furthermore, a numerical simulation of a section of the microfluidic model under the experimental conditions presented results within acceptable margins of the experimental ones. The results of the presented methodology indicate the potential to replace conventional technology for the measurement of MMP with microfluidic technology. Its promise lies in accelerating laboratory tests and increasing the reliability of experimental results and, subsequently, the quality of field gas EOR operations.

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Section: Introductionmentioning

confidence: 99%

Microfluidic Studies on Minimum Miscibility Pressure for n-Decane and CO2

et al. 2023

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“…However, these techniques fail when dealing with high viscosity oil. The industrially accepted method, the slim tube test, is not physically affordable for high viscosity oil [21].…”

Section: Introductionmentioning

confidence: 99%

Huff-n-Puff Experimental Studies of CO2 with Heavy Oil

Shilov

Maksakov

Kharlanov³

2019

Energies

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This work is devoted to CO2 Huff-n-Puff studies on heavy oil. Oil recovery for heavy oil reservoirs is sufficiently small in comparison with conventional reservoirs, and, due to the physical limitation of oil flow through porous media, a strong need for better understanding of tertiary recovery mechanisms of heavy oil exists. Notwithstanding that the idea of Huff-n-Puff gas injection technology for enhanced oil recovery has existed for dozens of years, there is still no any precise methodology for evaluating the applicability and efficiency of this technology in heavy oil reservoirs. Oil recovery factor is a question of vital importance for heavy oil reservoirs. In this work, we repeated Huff-n-Puff tests more than three times at five distinct pressure points to evaluate the applicability and efficiency of CO2 Huff-n-Puff injection to the heavy oil reservoirs. Additionally, the most critical factor that affects oil recovery in gas injection operation is the condition of miscibility. Experimental data allowed to distinguish the mixing zone of the light fractions of studied heavy oil samples. The experimental results showed that the pressure increase in the Huff-n-Puff injection process does not affect the oil recovery when the injection pressure stays between miscibility pressure of light components of oil and minimum miscibility pressure. It was detected that permeability decreases after Huff-n-Puff CO2 tests.

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Huff-n-Puff Test For Minimum Miscibility Pressure Determination For Heavy Oil

Cited by 2 publications

References 9 publications

Microfluidic Studies on Minimum Miscibility Pressure for n-Decane and CO2

Microfluidic Studies on Minimum Miscibility Pressure for n-Decane and CO2

Huff-n-Puff Experimental Studies of CO2 with Heavy Oil

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