Investigation on in Situ Foam Technology for Enhanced Oil Recovery in Offshore Oilfield

Chen, Hailong; Li, Zhaomin; Wang, Fei; Li, Songyan

doi:10.1021/acs.energyfuels.9b03105

Cited by 24 publications

(11 citation statements)

References 42 publications

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“…195 In high temperature, high salinity and carbonate cores, C12 and CO 2 can produce moderate strength foams, but high temperature (120 °C) is not conducive to foam stability. Chen et al 193,196 systematically studied in situ CO 2 foams (ISCF) flooding by combining in situ CO 2 gas reactants (anhydrous carbonate, hydrochloric acid) and biosurfactant. Under the same injection conditions, ISCF can produce obviously more oil than conventional foam or foam-free in situ CO 2 recoveries.…”

Section: Microemulsion Floodingmentioning

confidence: 99%

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Wang

Han

et al. 2023

Energy Fuels

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Despite rapid advances in renewable energy extraction and utilization, global oil demand continues to rise. Oil displacement technologies are widely studied and applied because they can extract more oil in depleted reservoirs or recover unconventional ones. This study introduces research methods and mechanisms of four oil displacement technologies, i.e., water flooding, chemical flooding, gas flooding, and steam flooding. Although oil displacement technologies are helping to meet the growing demand for oil and energy, there are still some challenges for industrial applications. Some agents adopted in the oil displacement have shortcomings in the corrosion of mining equipment and damage to the reservoir structure. Therefore, solutions to the problem are crucial and are investigated widely in the literature using experiments and simulations. For experimental research, a diffusion framework for studying mass transfer in the oil displacement process and an experimental system for simulating oil displacement in offshore reservoirs should be built, which will facilitate the widespread industrial application of oil displacement technology. Therefore, it is necessary to improve the accuracy and expand the application range of the experimental system. As for numerical simulation, reaction kinetics research is essential for selecting displacement agent materials and preventing harmful gas leakage for industrial applications. However, the dynamics of foam flooding and CO2 flooding are not thoroughly studied. Moreover, it is an acceptable research topic that reducing the uncertainty of discrete regions is an effective method to improve the accuracy of numerical simulation results. For the broader application of oil displacement technology to industry, several mechanisms regarding the research field could be studied more thoroughly and comprehensively in the future, i.e., (1) the influence mechanisms of some impurities and complex reservoir physical properties, (2) the method of combining various oil displacement technologies, (3) the T-H-M-C multifield coupling oil displacement mechanism at micro/nanoscale, (4) the cement failure mechanism caused by CO2 and H2S, and (5) the tube brittle fracture mechanism caused by stress corrosion. For the sustainable development and efficient utilization of oil displacement, this review summarizes the extensive information about four oil displacement technologies, thus encouraging and providing research topics for further development and applications.

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Section: Microemulsion Floodingmentioning

confidence: 99%

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Wang

Han

et al. 2023

Energy Fuels

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“…In recent years, technology for enhancing oil recovery has been widely used in oilfield production and the role of emulsions has become increasingly significant. − In the formation, emulsions can be used as a plugging agent to plug the high-permeability layer, thereby increasing the sweeping volume of the oil displacement agent. − The oil displacement mechanism is basically consistent with that of the foam flooding and polymer flooding. − The emulsion can also be used as a displacement agent to enhance the displacement efficiency of the heterogeneous oil reservoir. , The macroscopic oil displacement mechanism is deeply correlated with the microscopic properties of the emulsion system. The greater the stability of the interfacial film of the emulsion system, the higher the macroscopic stability of the emulsion. − Factors such as the type and concentration of surfactant not only affect the properties of the emulsion formed but also have great effects on the practical production of oilfields. − Rao et al adopted a low-cost surfactant to change the wettability for enhancing the potential in oil recovery.…”

Section: Introductionmentioning

confidence: 98%

Study of Rheological Properties and Micro-mechanism of Heavy Oil Emulsion Prepared via Ultrasonic Dispersion

Sheng

et al. 2020

Energy Fuels

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An emulsion is a dispersion with a complex mechanism of formation and a poor stability. In the preparation of emulsions, the used surfactant concentration, oil−water ratio, and kinetic conditions affect the type, microscopic characteristics, and rheological properties of the emulsions. As a result of its high viscosity, it is difficult to disperse the heavy oil with mechanical agitation, and the stability of the emulsion system formed is poor; hence, it is challenging to study its rheological properties. Therefore, herein, the ultrasonic dispersion method was employed to prepare the emulsion, and the microscopic characteristics of the emulsion were observed using an optical microscope and nanoparticle size analyzer. The conductivity of the emulsion system was studied by a conductivity meter. The effects of different surfactant concentrations, oil−water ratios, and kinetic conditions on the emulsion type and micro-characteristics were obtained. The experiments were performed to study the rheological properties of oilin-water (O/W) and water-in-oil (W/O) emulsions. The results indicate that the emulsion prepared using an ultrasonic dispersion method was O/W-type when the mass percentage of a surfactant solution was higher than 0.1 wt % and the oil−water ratio was less than 1:3. The droplet size reaches a nanometer level and increases with a higher surfactant concentration. The particle size no longer decreases when the critical micelle concentration of the surfactant is reached. The droplet size corresponding to the peak of size frequency distribution was 70 nm, and the rheological curve was a shear-thickening dilatant fluid. When the mass percentage of a surfactant solution was lower than 0.1 wt % and the oil−water ratio was higher than 1, a W/O emulsion was formed with the droplet size of 10 μm. When the shear rate was less than 50 s −1 , the emulsion was a pseudo-plastic fluid with shear-thinning behavior. As the shear rate increased, the emulsion gradually exhibited Newtonian fluid behavior.

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“…For a constant flow of a co-injected gas and liquid in a pre-flushed (with surfactant solution) homogeneous porous medium, there is a pressure gradient observed for which the generation of weak foam changes to the generation of strong foam. − The generation of strong foam drastically reduces mobility. , …”

Section: Introductionmentioning

confidence: 99%

“…12−14 The generation of strong foam drastically reduces mobility. 15,16 Some researchers examined the effect where the addition of a polymer to the injected surfactant solution enhances both foam viscosity and stability, and such polymer-enhanced foams (PEFs) can be used as an effective mobility control agent. 17−19 When the bulk liquid used to generate foam contains polymers, the foam has more resistance to gas flow than foam generated by a bulk solution without polymers.…”

Section: ■ Introductionmentioning

confidence: 99%

Investigation of Foam Flooding Assisted by Non-Newtonian and Novel Newtonian Viscosifying Agents for Enhanced Oil Recovery

Hosseini-Nasab

Rezaee

Taal³

et al. 2022

ACS Omega

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One of the main reasons for foam flooding enhanced oil recovery (EOR) is mobilizing oil left in the reservoir after primary recovery (depletion by pressure difference solely) and water flooding. However, expanding the infrastructure for certain foam EOR projects might be necessary as more wells are required, or a different well pattern is necessary. This study aims to study the effect of Newtonian and non-Newtonian viscosifying agents to assist foam flooding under the porous medium condition and to compare the results. Furthermore, this paper attempts to investigate the use of glycerol as a novel promising economic and ecological candidate instead of polymers. The shear rate inside the core was calculated based on the literature, which was combined with viscometric measurements in order to form four pairs of equal apparent viscosity. The differences and overlap within the core flooding experiments with foam generated by Newtonian and non-Newtonian fluids were observed by examining the mobility reduction factor under transient and steady-state conditions and by calculating the gas fraction present in the core. It was concluded that glycerol in core flood experiments could reach the same mobility reduction factor of about 1600 as polymer solutions with the same apparent viscosity, as long as the viscosity of the injected solution is reasonably low. Moreover, glycerol even reached the maximum mobility reduction factor faster than the foam generated by the polymer solution.

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Investigation on in Situ Foam Technology for Enhanced Oil Recovery in Offshore Oilfield

Cited by 24 publications

References 42 publications

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Study of Rheological Properties and Micro-mechanism of Heavy Oil Emulsion Prepared via Ultrasonic Dispersion

Investigation of Foam Flooding Assisted by Non-Newtonian and Novel Newtonian Viscosifying Agents for Enhanced Oil Recovery

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