Enhanced Oil Recovery

Green, Don W.; Willhite, G.P.

doi:10.2118/9781613994948

Cited by 157 publications

(156 citation statements)

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“…This is important for EOR, because polymers can increase the brine viscosity by at most two orders of magnitude due to the reservoir pressure gradient constraint. Therefore, it was believed for a long time that polymers cannot reduce ROS (Needham and Doe 1987;Lake 1989;Lake et al 2014;Green and Willhite 2018). However, some recent polymer flooding experiments produced CDCs that are different from previously observed CDCs.…”

Section: Cdcs For Polymer Floodsmentioning

confidence: 95%

“…, 41 and the dots indicate other parameters. CDCs are among the most important curves in EOR (Lake 1989;Green and Willhite 2018), because the key issue in EOR is to reduce residual oil saturation ROS significantly and economically by various EOR methods and processes. Capillary desaturation curves enter as important input parameters into reservoir simulations (Youssef et al 2013).…”

Section: Capillary Desaturation Curvesmentioning

confidence: 99%

“…Standard EOR techniques are based on the classical microscopic number Ca. Among different EOR techniques, chemical flooding is more closely related to the capillary number (Green and Willhite 2018) than other methods. Surfactants in chemical EOR serve to reduce the oil/water interfacial tension σ from typically around σ ≈ 35mN/m to 10 −3 mN/m to reach sufficiently high capillary numbers (Guo et al 2018(Guo et al , 2019.…”

Section: Non-monotonic Cdcsmentioning

confidence: 99%

“…A primary objective of enhanced oil recovery (EOR) methods is to extract original oil in place (OOIP) efficiently and economically from oil reservoirs (Lake 1989;Green and Willhite 2018). Despite many years of study, the best way to achieve this objective has remained one of the hottest research topics for petroleum engineers, geologists, chemical engineers and hydrologists.…”

Section: Introductionmentioning

confidence: 99%

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A Brief Review of Capillary Number and its Use in Capillary Desaturation Curves

2022

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Capillary number, understood as the ratio of viscous force to capillary force, is one of the most important parameters in enhanced oil recovery (EOR). It continues to attract the interest of scientists and engineers, because the nature and quantification of macroscopic capillary forces remain controversial. At least 41 different capillary numbers have been collected here from the literature. The ratio of viscous and capillary force enters crucially into capillary desaturation experiments. Although the ratio is length scale dependent, not all definitions of capillary number depend on length scale, indicating potential inconsistencies between various applications and publications. Recently, new numbers have appeared and the subject continues to be actively discussed. Therefore, a short review seems appropriate and pertinent.

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Section: Cdcs For Polymer Floodsmentioning

confidence: 95%

Section: Capillary Desaturation Curvesmentioning

confidence: 99%

Section: Non-monotonic Cdcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Brief Review of Capillary Number and its Use in Capillary Desaturation Curves

2022

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“…As is well known, the EOR period is a very important production period because more than 30 % of the oil in place can be recovered in this period (Green and Willhite 1998). EOR has a lot of methods and every method has its own considerations for use.…”

Section: Introductionmentioning

confidence: 99%

Literature Review of Nanotechnology in the Enhanced Oil Recovery.

Samba

Li²,

liu³

et al. 2022

JER is an international, peer-reviewed journal that publishes f

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In recent studies, there has been an increasing focus on Nanoparticles Enhanced Oil Recovery (NPEOR). NPEOR is a method that was initially developed to improve microscopic and macroscopic displacement efficiency. In some recent applications NP have been assisted the conventional EOR methods such as a polymer, surfactant, and Co2 flooding, with the purpose of increasing the oil recovery. In this literature, the abilities to use NP in EOR are investigated. The function of different types of NP, different types of Dispersing agents, availability of nanomaterials in the lab, the effect of nanoparticles to change the properties, future challenges and concerns about the NP, are reviewed. However, the stability of suspensions of NP is still the most barrier to use NP in EOR. Upcoming studies are necessary to focus on the outcome of the appropriate techniques of NP to improve their stability under the worst conditions of reservoirs and investigate new types of nanoparticles.

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Simultaneous sorption and mechanical entrapment during polymer flow through porous media

Farajzadeh

Bedrikovetsky

Lotfollahi

et al. 2016

Water Resources Research

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Physical adsorption and mechanical entrapment are two major causes of polymer retention in porous media. Physical adsorption is considered an equilibrium process and is often modeled by assuming a Langmuir isotherm. The outcome is a steady state pressure response because the permeability reduction is also accounted for by adsorption. However, some experimental data show gradual increase of pressure with time, implying that polymer retention is a time‐dependent process. We discuss simultaneous effect of sorption and mechanical entrapment on the polymer retention in porous media. An exact solution for 1‐D flow problem for the case of constant filtration coefficient and Langmuir‐sorption isotherm, including explicit formulae for breakthrough concentration and pressure drop across the core is derived. The general model with a varying filtration coefficient was successfully matched with experimental data confirming the occurrence of simultaneous sorption with deep‐bed filtration during polymer flow in porous media. In the absence of mechanical entrapment, the physical adsorption causes delay in the polymer front and does not affect the polymer concentration behind the front. Addition of mechanical entrapment results in slow recovery of the injected concentration at the outlet (for a varying filtration coefficient) or reaching to a steady state concentration, which is only a fraction of the injected concentration (for a constant filtration coefficient). Accurate assessment and quantification of the polymer retention requires both pressure and effluent concentration data at the outlet of the porous medium.

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Enhanced Oil Recovery

Cited by 157 publications

References 0 publications

A Brief Review of Capillary Number and its Use in Capillary Desaturation Curves

A Brief Review of Capillary Number and its Use in Capillary Desaturation Curves

Literature Review of Nanotechnology in the Enhanced Oil Recovery.

Simultaneous sorption and mechanical entrapment during polymer flow through porous media

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