Rheological properties and viscosity reduction of South China Sea crude oil

Sun, Hui; Lei, Xingxing; Shen, Benxian; Zhang, Huiran; Liu, Jichang; Li, Gengnan; Wu, Di

doi:10.1016/j.jechem.2017.07.023

Cited by 19 publications

(11 citation statements)

References 51 publications

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“…6b, the total content of bioacids produced after the activation of functional microbial groups was 4209.69 mg/L, of which acetic acid (1078.3 mg/L), propionic acid (715.7 mg/L), isobutyric acid (564.2 mg/L), butyric acid (590.1 mg/L), isovaleric acid (534.8 mg/L), and valeric acid (713.2 mg/L). Among them, the acetic acid was mainly produced by the metabolism of hydrocarbon oxidizing bacteria and fermenting bacteria (the following reaction: functional bacteria + R-CH 2 CH 3 + O 2 + nutrients → intermediate metabolites (bio-alcohol and bio-aldehyde) → R-COOH), which can dissolve in crude oil to reduce the viscosity (decreased from the initial 8.33 to 5.75 mPa·s) as well as react with carbonate rocks to improve the wettability of rocks and holes 42 . The acetate and butyrate can interact to form a mixed acid that increased the permeability of the crude oil 43 .…”

Section: Resultsmentioning

confidence: 99%

Stimulation of indigenous microbes by optimizing the water cut in low permeability reservoirs for green and enhanced oil recovery

Cui

Zhang

et al. 2019

Sci Rep

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Low permeability oil reservoirs are a widespread petroleum reservoir type all over the world. Therefore, methods to recover these reservoirs efficiently are of importance to guarantee energy supply. Here we report our novel stimulation of indigenous microbes by optimizing the water cut in low permeability reservoirs for green and enhanced oil recovery. We aimed to investigate the characteristics of indigenous bacterial communities with changes in water cut in reservoirs by high-throughput sequencing technology, and reveal the mechanism and characteristics of the crude oil biotreatment under different crude oil-water ratio conditions and the optimum activation time of indigenous functional microbial groups in reservoirs. The indigenous microbial metabolism products were characterized by gas chromatography mass spectrometry. Results showed that Acinetobacter (47.1%) and Pseudomones (19.8%) were the main functional genus of crude oil degradation at the optimal activation time, and can reduce the viscosity of crude oil from 8.33 to 5.75 mPa·s. The dominant bacteria genus for oil recovery after activation of the production fluids was similar to those in the reservoirs with water cut of 60–80%. Furthermore seven mechanism pathways of enhancing oil recovery by the synergistic of functional microbial groups and their metabolites under different water cut conditions in low permeability reservoirs have been established.

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Section: Resultsmentioning

confidence: 99%

Stimulation of indigenous microbes by optimizing the water cut in low permeability reservoirs for green and enhanced oil recovery

Cui

Zhang

et al. 2019

Sci Rep

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“…However, this behavior was not observed. It can be explained by the presence of greater amounts of resins and asphaltenes that increases the density and consequently, the viscosity of heavy petroleum 3 . Aggregates are formed in the volume phase of heavy oil by resins bonded to asphaltene cores by polar functional group interactions 14 , schematically illustrated in Figure 1A.…”

Section: Electrochemical Impedance Spectroscopy and Potentiodynamic Pmentioning

confidence: 99%

“…On the AISI 1020 steel after contact with the heavy petroleum ( Figure 4B) there was only localized corrosion by pitting. The resin-asphaltene colloids in heavy petroleum act as ionic mobility blockers 3,14 acting as natural inhibitors of the corrosion process. Besides that, the greater amount of sulfur compounds in heavy oil may produce passive ferrous sulfide films (FeS) on steel surface 8,26 , which inhibits the naphthenic corrosion 27,28 and decreases the chloride corrosion 24 .…”

Section: Lmentioning

confidence: 99%

“…In heavier petroleum, there are high proportions of aromatics, resins, asphaltenes and sulfur compounds 2 . The high concentration of resins and asphaltenes increases the density and, consequently, the viscosity of petroleum 3 . In lighter petroleum, there are high proportions of the paraffinic and naphthenic acids, and a lower concentration of the sulfur compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the elements mentioned above, petroleum also contains resins and asphaltenes that aggregate in the form of colloids 14 and block the mobility of the ionic species 3 . Therefore, petroleum consists in a complex system with different compounds acting simultaneously, such as highly corrosive impurities, ionic mobility blockers and noncorrosive compounds.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Physicochemical Characteristics of Heavy, Medium and Blend Crude Petroleum on Corrosion Resistance of AISI 1020 Carbon Steel

et al. 2019

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This work investigates the influence of the physicochemical characteristics of heavy (17.5 °API), medium (28.3 °API) and blend (50% heavy + 50% medium) crude petroleum on corrosion of AISI 1020 carbon steel at 25.0 ± 1.0°C. The corrosion resistance of steel was analyzed by electrochemical impedance spectroscopy, potentiodynamic polarization, and scanning electron microscopy. The electrochemical results and the micrographs show that the corrosion on steel surfaces after contact with the heavy oil is lesser than medium and blend petroleum, although the heavy oil presents a higher amount of total acid number, sulfur compounds and salt. On steel sample immersed in heavy oil, a localized pitting corrosion was identified, while on samples immersed in medium and blend petroleum was found evidence of pitting and alveolar corrosion.

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Synthesis of a Heavy‐Oil Viscosity Reducer Containing a Benzene Ring and Its Viscosity Reduction Mechanism

Quan

Huang

et al. 2022

ChemistrySelect

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In this study, a small molecular viscosity reducer containing benzene ring was synthesized and evaluated its ability of dispersing asphaltenes and resins. It is helpful for introduction of polar groups to dispersing asphaltene. Benzene ring structure can make viscosity reducer molecules penetrate into the stacking structure of asphaltene and resin better. The long carbon chain in the molecule can interact with paraffin to change the crystalline state of paraffin and reduce the viscosity of heavy oil. Therefore, viscosity reducer has the function of reducing viscosity of heavy oil. And the smaller molecular weight can effectively avoid the phenomenon of viscosity increase in the process of viscosity reduction due to the excessive molecular weight of viscosity reducer. The experimental results show that VR‐1 has good viscosity reduction ability. And VR‐1 has excellent effect on the dispersion of asphaltene and the reduction of particle size. The mechanism of viscosity reduction is studied, and the results are consistent with the experimental results.

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Rheological properties and viscosity reduction of South China Sea crude oil

Cited by 19 publications

References 51 publications

Stimulation of indigenous microbes by optimizing the water cut in low permeability reservoirs for green and enhanced oil recovery

Stimulation of indigenous microbes by optimizing the water cut in low permeability reservoirs for green and enhanced oil recovery

Investigation of Physicochemical Characteristics of Heavy, Medium and Blend Crude Petroleum on Corrosion Resistance of AISI 1020 Carbon Steel

Synthesis of a Heavy‐Oil Viscosity Reducer Containing a Benzene Ring and Its Viscosity Reduction Mechanism

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