Miscible oil recovery utilizing N2 and/or HC gases in CO2 injection

Belhaj, Hadi; Abukhalifeh, Hadil; Javid, Khalid

doi:10.1016/j.petrol.2013.08.030

Cited by 49 publications

(31 citation statements)

References 24 publications

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“…However, pure CO 2 with 100% concentration is almost impossible. Regardless of the separation from the oil and gas industry or the capture from other sources, CO 2 always contains some impurities, such as CH 4 , H 2 S and N 2 (Belhaj et al, 2013a;Chapoy et al, 2013;Jin et al, 2018;Li et al, 2011;Ziabakhsh-Ganji and Kooi, 2012). The mixture of CO 2 and H 2 S is so-called acid gas.…”

Section: Introductionmentioning

confidence: 99%

The effect of impurity on miscible CO₂displacement mechanism

Luo

Wang

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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The CO2 displacement is one of the gasflooding Enhanced Oil Recovery (EOR) methods. The application from volatile oil to black oil is popular mainly because CO2 requires a relatively low miscibility pressure, which is suitable to most reservoir conditions. However, CO2 always contains some impurity, such as CH4, H2S and N2, leading to the change of phase behavior and flooding efficiency. Whether the gasflooding achieves successfully miscible displacement depends on the reservoir pressure and temperature, injected solvent and crude oil compositions. So three different types of oil samples from the real field are selected and mixtures of CH4, H2S and N2 with various CO2 concentrations as the solvent are considered. After a series of experimental data are excellently matched, three nine-pseudocomponent models are generated based on the thermodynamic Equation-of-State (EoS), which are capable of accurately predicting the complicated phase behavior. Three common tools of pressure–temperature (P–T), pressure–composition (P–X) and pseudoternary diagrams are used to display and analyze the alteration of phase behavior and types of displacement mechanism. Simulation results show that H2S is favorable to attain miscibility while CH4 and N2 are adverse, and the former can reduce the Multiple Contact Miscibility (MCM) pressure by the maximum level of 1.675 MPa per 0.1 mol. In addition, the phase envelope of the mixtures CO2/H2S displacing the reservoir oil on the pseudoternary diagram behaves a triangle shape, indicating the condensing-dominated process. While most phase envelopes of CO2/CH4 and CO2/N2 exhibit the trump and bell shapes, revealing the MCM of vaporization.

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Section: Introductionmentioning

confidence: 99%

The effect of impurity on miscible CO₂displacement mechanism

Luo

Wang

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…It is well known that the asphaltenes molecules disperse in oil, and form a relatively homogeneous solution at low pressures. As the pressure increases, the concentration of N 2 increases, due to which, the asphaltenes molecules flocculate due to the inverse relationship between the pressure and the oil composition 14,15 . The interfacial activity of colloidal solutions usually increases due to the tendency of particles to accumulate at the interfaces.…”

Section: Resultsmentioning

confidence: 99%

Flow behavior of N2 huff and puff process for enhanced oil recovery in tight oil reservoirs

et al. 2017

Sci Rep

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In the present work, the potential of N2 huff and puff process to enhance the recovery of tight oil reservoir was evaluated. N2 huff and puff experiments were performed in micromodels and cores to investigate the flow behaviors of different cycles. The results showed that, in the first cycle, N2 was dispersed in the oil, forming the foamy oil flow. In the second cycle, the dispersed gas bubbles gradually coalesced into the continuous gas phase. In the third cycle, N2 was produced in the form of continuous gas phase. The results from the coreflood tests showed that, the primary recovery was only 5.32%, while the recoveries for the three N2 huff and puff cycles were 15.1%, 8.53% and 3.22%, respectively.The recovery and the pressure gradient in the first cycle were high. With the increase of huff and puff cycles, and the oil recovery and the pressure gradient rapidly decreased. The oil recovery of N2 huff and puff has been found to increase as the N2 injection pressure and the soaking time increased. These results showed that, the properly designed and controlled N2 huff and puff process can lead to enhanced recovery of tight oil reservoirs.

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“…The decrease of primary production in conventional and unconventional oil recovery has led to rapid development of a variety of techniques and enhanced oil recovery (EOR) processes to extract residual oil prior to abandoning the reservoir . In general, EOR techniques are categorized into four main classes: gas injection, chemical flooding, thermal processes, and microbial flooding.…”

Section: Introductionmentioning

confidence: 99%

“…In general, EOR techniques are categorized into four main classes: gas injection, chemical flooding, thermal processes, and microbial flooding. Gas injection is widely used for enhanced oil recovery processes, contributing to higher oil recovery by injecting various gases such as carbon dioxide, natural gas, nitrogen, enriched natural gas, or flue gas into the oil reservoir . Among the different gases, CO 2 is recognized as a very effective EOR agent for displacing oil from reservoirs by several mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Accurate determination of the CO₂‐crude oil minimum miscibility pressure of pure and impure CO₂ streams: A robust modelling approach

Hemmati-Sarapardeh¹,

Ghazanfari²,

Ayatollahi³

et al. 2016

Can J Chem Eng

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Gas flooding processes have emerged as attractive enhanced oil recovery (EOR) methods over the last few decades. Among different gas flooding processes, CO2 flooding is recognized as being most efficient for displacing oil through miscible displacement. Minimum miscibility pressure (MMP) is a crucial parameter for successfully designing CO2 flooding, which is traditionally measured through time‐consuming, expensive, and cumbersome experiments. In the present study, a new reliable model based on feed‐forward artificial neural networks was presented to predict both pure and impure CO2‐crude oil MMP. Among various properties and parameters, reservoir temperature, reservoir oil composition, and injected gas composition were selected as the input parameters of the proposed model. To evaluate and compare the results of the developed model with existing models, both statistical and graphical error analyses were simultaneously employed. The results showed that the proposed model is more reliable and accurate compared to existing models in a wide range of thermodynamic and process conditions. Furthermore, by employing the relevancy factor, it was found that the reservoir temperature has the most significant impact on the MMP. Finally, in order to identify probable outliers and the applicability domain of the proposed model, the leverage approach was performed. The results illustrated that only two experimental MMP data points were located outside of the applicability domain of the proposed model. As a result, the developed model is statistically reliable for predicting crude oil MMP.

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Miscible oil recovery utilizing N2 and/or HC gases in CO2 injection

Cited by 49 publications

References 24 publications

The effect of impurity on miscible CO₂displacement mechanism

The effect of impurity on miscible CO₂displacement mechanism

Flow behavior of N2 huff and puff process for enhanced oil recovery in tight oil reservoirs

Accurate determination of the CO₂‐crude oil minimum miscibility pressure of pure and impure CO₂ streams: A robust modelling approach

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Miscible oil recovery utilizing N2 and/or HC gases in CO2 injection

Cited by 49 publications

References 24 publications

The effect of impurity on miscible CO2displacement mechanism

The effect of impurity on miscible CO2displacement mechanism

Flow behavior of N2 huff and puff process for enhanced oil recovery in tight oil reservoirs

Accurate determination of the CO2‐crude oil minimum miscibility pressure of pure and impure CO2 streams: A robust modelling approach

Contact Info

Product

Resources

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The effect of impurity on miscible CO₂displacement mechanism

The effect of impurity on miscible CO₂displacement mechanism

Accurate determination of the CO₂‐crude oil minimum miscibility pressure of pure and impure CO₂ streams: A robust modelling approach