Experimental study of the phase behavior of methane and crude oil mixtures

Yanes, José Francisco Romero; Feitosa, Filipe Xavier; Fleming, Felipe P.; Sant’Ana, Hosiberto Batista de

doi:10.1016/j.fuel.2019.115850

Cited by 16 publications

(30 citation statements)

References 52 publications

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“…Also, phase transitions, that is, asphaltene precipitation onset and bubble point pressure, are observed at lower pressures when compared to a pure methane mixture. 14 This result is expected because of the solubility contribution of the CO 2 addition.…”

Section: Resultsmentioning

confidence: 82%

“…Possible phases settling in the PVT cell during the equilibration time could result in increased NIR transmittance signal in each equilibrium step, also observed and described in our previous work. 14 For the same reason, the HPM test shows a smoothed NIR transmittance curve (Figure 7) that is caused by the continuous stirring during the test.…”

Section: Resultsmentioning

confidence: 89%

“…For this first system tested, a molar ratio of 66.0 CO 2 mol % was obtained. This same molar gas composition was tested in our past works, using pure methane mixed with the same crude oil 14 or CO 2 with a comparable presalt oil. 10 Similarly, no asphaltene precipitation or phase separation was observed.…”

Section: Resultsmentioning

confidence: 99%

“…14,15,35 In this regard, it was possible to identify nontypical phase transitions when crude oil is mixed with methane above 72.5 mol %. 14 Specifically, stable and low asphaltenic crude oils presented an uncommon highly dispersed asphaltic phase when mixed with a high content of methane, that is, asphaltenes with no fractal morphology and rapid redissolution with pressure increase. These asphaltenic phase characteristics are observed at high methane composition in all studied cases.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Fluid Phase Equilibria for High Gas Ratio Mixtures of Carbon Dioxide, Methane, and Brazilian Presalt Crude Oil

et al. 2021

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The phase behavior of petroleum fluids under reservoir conditions provides fundamental information for an adequate crude oil production scheme. Recently, complex phase transitions have been studied for presalt crude oils, involving atypical liquid–liquid–vapor and liquid–liquid–asphalt phase transitions. In this paper, the phase behavior of synthetic mixtures containing carbon dioxide, methane, and a Brazilian presalt crude oil was investigated using PVT, coupled with near-infrared (NIR) transmittance and high-pressure microscopy (HPM) measurements. Crude oil (API 28.0, 0.68 wt % of asphaltenes) was mixed with 25.0 wt % gas (for a CH4/CO2 ratio from 0 to 62.5 wt %), and the phase behavior of the mixture was evaluated at a reservoir temperature of 343.15 K and pressures up to 100 MPa. Black oil phase behavior was detected for systems with a lower CH4/CO2 ratio and lower gas volume fraction, with no asphaltenes precipitation observed. As the CH4/CO2 ratio increased, pressure–volume curves showed a slight phase transition, with a not evident sharp break in the slope because of the minor difference of fluid compressibility. Moreover, a phase insolubility was confirmed by NIR and HPM tests for a high CH4/CO2 ratio that can be associated with the formation of an asphaltic phase. When total molar gas content increases by increasing the CH4/CO2 ratio, the asphaltic phase is formed at higher pressures. However, asphaltenes were detected as an uncommon fine dispersion with no larger fractal aggregates formation, even at pressures far below the asphaltenes onset pressure (AOP). Additionally, a nontypical behavior was observed in HPM tests with a total asphaltene dissolution when pressure reached the bubble pressure point. This atypical redissolution is in accordance with an instantaneous phase dissolving at pressures higher than the AOP, observed for the same oil at high methane ratios.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement of Fluid Phase Equilibria for High Gas Ratio Mixtures of Carbon Dioxide, Methane, and Brazilian Presalt Crude Oil

et al. 2021

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“…But the P-V curve becomes continuous 8 Lithosphere and inflection point is no longer obvious when the injected concentration increases. Bubble-point pressure was identified by two different methods, as follows: (i) the inflection-point of the slope for pressure-volume line and (ii) the first bubble was observed by the camera located in front of sapphire visual windows [45]. The first bubble escapes from the oil when the pressure was below the bubble-point pressure, and then, a large amount of gas converges a separate gas phase at the top PVT cell as the pressure decreased.…”

Section: Constant Composition Expansion (Cce)mentioning

confidence: 99%

Experimental Investigation of Phase Behavior of Condensate Gas and Crude Oil System in Underground Gas Storage

Tang

Min

et al. 2022

Lithosphere

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The phase behavior of reservoir fluids is crucial for the smooth operation of an underground gas storage (UGS). In this work, three experiments were conducted to investigate the phase behavior of condensate and crude oil systems within different development stages of gas storage in Bohai Bay Basin of eastern China. In stage 1, constant volume depletion (CVD) test was conducted to simulate the interaction of the original condensate gas-live oil system. In stage 2, the phase behavior of a series of mixtures of live oil with 47.5, 58.3, 69.9, and 77.4 mol% of condensate gas was studied by constant composition expansion (CCE) test. In stage 3, a new experiment was designed to study the mass transfer and phase behavior during cyclic injection-production process of the underground gas storage. The results from the CVD test describe the effect of each pressure stage on produced gas composition and equilibrium oil properties in the condensate crude oil system. The results of the CCE test indicate that condensate gas can expand the oil and improve the properties. The results of cyclic injection-production experiment demonstrate that the mass transfer in condensate gas and oil system is a dual mechanism of condensation and vaporization. With the increase of the cycle, the intermediate components of oil phase are enriched and the heavy components decreases. After four cycles, the oil and gas interphase mass transfer reaches dynamic equilibrium. In addition, test results show that multicycle operation is beneficial to improve the oil properties. This work is of great significance to understand the phase transition mechanism of underground gas storage, which provides a basis for other researchers to further update and improve the EOS model.

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Dew pressure point and liquid dropout of CH4 + alcohol (methanol or ethanol) system with high gas content at high-pressure and high-temperature

Medeiros

Lino

Alves

et al. 2023

Fluid Phase Equilibria

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Experimental study of the phase behavior of methane and crude oil mixtures

Cited by 16 publications

References 52 publications

Measurement of Fluid Phase Equilibria for High Gas Ratio Mixtures of Carbon Dioxide, Methane, and Brazilian Presalt Crude Oil

Measurement of Fluid Phase Equilibria for High Gas Ratio Mixtures of Carbon Dioxide, Methane, and Brazilian Presalt Crude Oil

Experimental Investigation of Phase Behavior of Condensate Gas and Crude Oil System in Underground Gas Storage

Dew pressure point and liquid dropout of CH4 + alcohol (methanol or ethanol) system with high gas content at high-pressure and high-temperature

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