Viscoelastic displacement and anomalously enhanced oil recovery of a novel star-like amphiphilic polyacrylamide

Liu, Rui; Du, Daijun; Pu, Wanfen; Peng, Qin; Tao, Zhengwu; Pang, Yu

doi:10.1016/j.cherd.2018.12.021

Cited by 28 publications

(21 citation statements)

References 30 publications

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“…The crude oil was dehydrated with a density of 0.873 g/cm 3 and viscosity of 14.8 mPa·s at the reservoir temperature of 45.3 °C. The SARA fractions of the crude oil were determined as reported in previous literature: 70.06% saturated hydrocarbon, 17.36% aromatic hydrocarbon, 12.15% resin, and 0.43% asphaltene . The acidity of the crude oil is given by the total acid number (TAN) that corresponds to the amount of potassium hydroxide needed to neutralize the acidic substances in crude.…”

Section: Methodsmentioning

confidence: 99%

“…In previous studies, we reported hydrophobically associative polyacrylamide hybrid nano-SiO 2 (SHPAM) as the polymer-process candidate. SHPAM is prepared by a free-radical polymerization technology with a preparation process similar to HPAM. , The core–shell microstructure and intermolecular interactions impart a high viscosification, viscoelastic performance and ageing stability to SHPAM, therefore, surpassing the linear structure of HPAM . The availability of raw materials, mild polymerization method, and expected properties make SHPAM a competent water-soluble polymer for EOR applications in high water cut reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Visual Laminations Combined with Nuclear Magnetic Resonance to Study the Micro-Unrecovered Oil Distribution and Displacement Behavior of Chemical Flooding in a Complex Conglomerate

Liu

Gou

et al. 2019

Energy Fuels

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The conglomerate reservoirs of the Kexia group, Xinjiang oilfield, NW China, are one of the largest conglomerate reservoirs worldwide and have employed chemical-enhanced oil recovery (EOR) processes since the 2010s. However, compared to sandstone reservoirs, the output of chemical flooding has been less than 2.0% because of the severe heterogeneity and complex fluid distribution. This study quantitatively examined the micro-unrecovered oil distribution and displacement behavior of polymer flooding in the complex conglomerate of the Kexia group by combining visual conglomerate laminations and online nuclear magnetic resonance experiment. The results indicated that the multistream sedimentary environments and the rapid transport of the clasts prior to deposition exacerbated the complexity of nonclay minerals and variable pore-throat structures. Compared to the sandstone, the variable pore channels and disconnected seepage network in the conglomerate caused macro-permeable water channels and rapid water cuts, resulting in the recovery of less than 40% of original oil in place (OOIP) by the earlier water flooding. The cluster of disconnected oil and oil resident in blind pores occupied a major proportion of unrecovered oil, which was the significant target for the polymer flooding. The data from the T 2 responses showed that the polymer solution first navigated through dominant porous media, while simultaneously building flow resistance in the higher permeability zones. The remaining oil in the disconnected oil cluster and the four types of residual oil (ganglia- and column-type oils, oil film, and oil resident in blind pores) were effectively displaced by the viscoelastic effects of the polymer solution. In addition, star-like polyacrylamide (SHPAM) has a higher pore space utilization compared to partially hydrolyzed polyacrylamide. For SHPAM, the incremental oil recovery factor was approximately 25% with an ultimate recovery factor of 64.2% OOIP. This work implies that the lower oil recovery efficiency of water flooding gives rise to a significant potential for chemical-EOR processes in complex conglomerates.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visual Laminations Combined with Nuclear Magnetic Resonance to Study the Micro-Unrecovered Oil Distribution and Displacement Behavior of Chemical Flooding in a Complex Conglomerate

Liu

Gou

et al. 2019

Energy Fuels

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“…46). An interesting alternative for EOR applications may be the combination of the amphiphilic polymers using a star-like architecture with nanoparticles, such as presented by Liu [401]. The molecule's architecture is a core of nano-SiO 2 , hyperbranched polyamidoamide as the subshell, and amphiphilic polyacrylamide (twin-tailed octyl chains as hydrophobic moieties, and amide/carboxyl groups as the hydrophilic moieties) as the shell.…”

Section: Polymeric Surfactantsmentioning

confidence: 99%

Chemical enhanced oil recovery and the role of chemical product design

2019

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“…46 For a theoretical explanation, we assume that the O/W emulsion-oil relative permeability curves are to the classical water−oil relative permeability curves reported by Lake et al 47 μ a and μ o can be estimated from the data measured by the Physical MCR 302 rheometer at a shear rate corresponding to that observed in porous media. Detailed information about extracting these values is available from the work reported by Liu et al 48 The mobility ratio curves of water and the emulsion compared to crude oil are shown in Figure 23. The increase in water saturation exacerbates the unfavorable mobility ratio between water and oil, in line with the low oil recovery factor of earlier water flooding.…”

Section: Dn Amentioning

confidence: 99%

Low-Energy Emulsification of Oil-in-Water Emulsions with Self-Regulating Mobility via a Nanoparticle Surfactant

Liu

et al. 2020

Ind. Eng. Chem. Res.

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Oil-field chemists and engineers have searched a method for intelligent flooding of chemical-intervention-based processes with self-regulating mobility in subterranean areas for decades. By designing hydrophilic nanoparticles (amine-terminated nanosilica particles (ATNPs)) and nonionic surfactant laurel monoanolamide (LEMA) molecules with complementary hydrogen bonding functionalities that bind one another at the oil–water interface, we developed a route to in situ oil-in-water (O/W) emulsions without a phase inversion point. Apparent viscosities of the O/W emulsions demonstrated a negative relationship to oil saturation and a positive relationship to water saturation over a broad range of water saturations from 30 to 78%. These emulsions are produced by low-energy emulsification, simply accomplished by mild shaking for tens of seconds. The total concentration of the nanoparticle surfactant is 7000 mg/L, much lower than reported in the previous literature. We show that a local turbulent eddy of the immiscible fluids provides sufficient energy and time for the nanoparticle surfactant to create O/W emulsions since their morphology, droplet size distribution, rheology, and stability are similar to those produced by high-energy emulsification using a high-shear rotor stator mixer. Emulsification kinetics and physical model tests demonstrate the synergistic effect of ATNPs and LEMA on arresting Ostwald ripening, increasing capillary numbers, and self-controlling the displacement frontier of these emulsions. This system produced a high oil recovery efficiency of a three-layer heterogeneous square core with an incremental oil recovery factor of 33.7% original oil in place (OOIP) and an ultimate recovery factor of 72.1% OOIP when the water cut of the earlier water flooding exceeds 98%. This work paves a pathway to the production of smart in situ O/W emulsions using nanoparticle surfactants for industrial oil recovery applications.

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Viscoelastic displacement and anomalously enhanced oil recovery of a novel star-like amphiphilic polyacrylamide

Cited by 28 publications

References 30 publications

Visual Laminations Combined with Nuclear Magnetic Resonance to Study the Micro-Unrecovered Oil Distribution and Displacement Behavior of Chemical Flooding in a Complex Conglomerate

Visual Laminations Combined with Nuclear Magnetic Resonance to Study the Micro-Unrecovered Oil Distribution and Displacement Behavior of Chemical Flooding in a Complex Conglomerate

Chemical enhanced oil recovery and the role of chemical product design

Low-Energy Emulsification of Oil-in-Water Emulsions with Self-Regulating Mobility via a Nanoparticle Surfactant

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