scholarly journals High-viscosity α-starch nanogel particles to enhance oil recovery

RSC Advances ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 8275-8285 ◽  
Author(s):  
Tuo Liang ◽  
Jirui Hou ◽  
Ming Qu ◽  
Mengdan Zhao ◽  
Infant Raj
Keyword(s):  
Oil Recovery ◽  
Water Channels ◽  
High Viscosity ◽  
Sweep Efficiency ◽  
Enhance Oil Recovery

The formation of dominant water channels is a serious problem for most oilfields, which results in low sweep efficiency.

scholarly journals Investigation on the effect of active-polymers with different functional groups for EOR

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 61-68
Author(s):  
Dong Zhang ◽  
Jian Guang Wei ◽  
Run Nan Zhou
Keyword(s):  
Functional Groups ◽  
Oil Recovery ◽  
Molecular Size ◽  
Type I ◽  
Cleaning Efficiency ◽  
Sweep Efficiency ◽  
Profile Control ◽  
Branched Chain ◽  
Swept Volume ◽  
Enhance Oil Recovery

AbstractActive-polymer attracted increasing interest as an enhancing oil recovery technology in oilfield development owing to the characteristics of polymer and surfactant. Different types of active functional groups, which grafted on the polymer branched chain, have different effects on the oil displacement performance of the active-polymers. In this article, the determination of molecular size and viscosity of active-polymers were characterized by Scatterer and Rheometer to detect the expanded swept volume ability. And the Leica microscope was used to evaluate the emulsifying property of the active-polymers, which confirmed the oil sweep efficiency. Results show that the Type I active-polymer have a greater molecular size and stronger viscosity, which is a profile control system for expanding the swept volume. The emulsification performance of Type III active-polymer is more stable, which is suitable for improving the oil cleaning efficiency. The results obtained in this paper reveal the application prospect of the active-polymer to enhance oil recovery in the development of oilfields.

Improving CO2 storage and oil recovery by injecting alcohol-treated CO2

2020 ◽  
Vol 60 (2) ◽  
pp. 662
Author(s):  
Saira ◽  
Furqan Le-Hussain
Keyword(s):  
Oil Recovery ◽  
Co2 Sequestration ◽  
Computer Modelling ◽  
Co2 Storage ◽  
Co2 Injection ◽  
Displacement Efficiency ◽  
Sweep Efficiency ◽  
Numerical Studies ◽  
Reservoir Simulator ◽  
Enhance Oil Recovery

Oil recovery and CO2 storage related to CO2 enhance oil recovery are dependent on CO2 miscibility. In case of a depleted oil reservoir, reservoir pressure is not sufficient to achieve miscible or near-miscible condition. This extended abstract presents numerical studies to delineate the effect of alcohol-treated CO2 injection on enhancing miscibility, CO2 storage and oil recovery at immiscible and near-miscible conditions. A compositional reservoir simulator from Computer Modelling Group Ltd. was used to examine the effect of alcohol-treated CO2 on the recovery mechanism. A SPE-5 3D model was used to simulate oil recovery and CO2 storage at field scale for two sets of fluid pairs: (1) pure CO2 and decane and (2) alcohol-treated CO2 and decane. Alcohol-treated CO2 consisted of a mixture of 4 wt% of ethanol and 96 wt% of CO2. All simulations were run at constant temperature (70°C), whereas pressures were determined using a pressure-volume-temperature simulator for immiscible (1400 psi) and near-miscible (1780 psi) conditions. Simulation results reveal that alcohol-treated CO2 injection is found superior to pure CO2 injection in oil recovery (5–9%) and CO2 storage efficiency (4–6%). It shows that alcohol-treated CO2 improves CO2 sweep efficiency. However, improvement in sweep efficiency with alcohol-treated CO2 is more pronounced at higher pressures, whereas improvement in displacement efficiency is more pronounced at lower pressures. The proposed methodology has potential to enhance the feasibility of CO2 sequestration in depleted oil reservoirs and improve both displacement and sweep efficiency of CO2.

scholarly journals Microbially Induced Calcium Carbonate Plugging for Enhanced Oil Recovery

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Chenpeng Song ◽  
Derek Elsworth
Keyword(s):  
Calcium Carbonate ◽  
Oil Recovery ◽  
Extracellular Polymeric Substances ◽  
Pore Space ◽  
Pore Wall ◽  
Ion Source ◽  
Sweep Efficiency ◽  
Small Pore ◽  
Lower Permeability ◽  
Enhance Oil Recovery

Plugging high-permeability zones within oil reservoirs is a straightforward approach to enhance oil recovery by diverting waterflooding fluids through the lower-permeability oil-saturated zones and thereby increase hydrocarbon displacement by improvements in sweep efficiency. Sporosarcina pasteurii (ATCC 11859) is a nitrogen-circulating bacterium capable of precipitating calcium carbonate given a calcium ion source and urea. This microbially induced carbonate precipitation (MICP) is able to infill the pore spaces of the porous medium and thus can act as a potential microbial plugging agent for enhancing sweep efficiency. The following explores the microscopic characteristics of MICP-plugging and its effectiveness in permeability reduction. We fabricate artificial rock cores composed of Ottawa sand with three separate grain-size fractions which represent large (40/60 mesh sand), intermediate (60/80 mesh sand), and small (80/120 mesh sand) pore sizes. The results indicate a significant reduction in permeability after only short periods of MICP treatment. Specifically, after eight cycles of microbial treatment (about four days), the permeability for the artificial cores representing large, intermediate, and small pore size maximally drop to 47%, 32%, and 16% of individual initial permeabilities. X-ray diffraction (XRD) indicates that most of the generated calcium carbonate crystals occur as vaterite with only a small amount of calcite. Imaging by SEM indicates that the pore wall is coated by a calcium carbonate film with crystals of vaterite and calcite scattered on the pore wall and acting to effectively plug the pore space. The distribution pattern and morphology of microbially mediated CaCO3 indicate that MICP has a higher efficiency in plugging pores compared with extracellular polymeric substances (EPSs) which are currently the primary microbial plugging agent used to enhance sweep efficiency.

scholarly journals Microbially induced calcium carbonate precipitation driven by ureolysis to enhance oil recovery

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37382-37391 ◽  
Author(s):  
Jun Wu ◽  
Xian-Bin Wang ◽  
Hou-Feng Wang ◽  
Raymond J. Zeng
Keyword(s):  
Calcium Carbonate ◽  
Oil Recovery ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Sweep Efficiency ◽  
Enhance Oil Recovery

Microbially induced calcium carbonate precipitation was used to improve poor volumetric sweep efficiency of water and enhance oil recovery.

scholarly journals Evaluation of Polymer Alternating Waterflooding in Multilayered Heterogeneous Waterflooded Reservoir

2018 ◽  
Vol 171 ◽  
pp. 04001
Author(s):  
Warut Tuncharoen ◽  
Falan Srisuriyachai
Keyword(s):  
Numerical Simulation ◽  
Viscous Fluid ◽  
Polymer Solution ◽  
Oil Recovery ◽  
High Viscosity ◽  
Polymer Flooding ◽  
Operating Parameters ◽  
Sweep Efficiency ◽  
Polymer Injection ◽  
Water Breakthrough

Polymer flooding is widely implemented to improve oil recovery since polymer can increase sweep efficiency and smoothen heterogeneous reservoir profile. However, polymer solution is somewhat difficult to be injected due to high viscosity and thus, water slug is recommended to be injected before and during polymer injection in order to increase an ease of injecting this viscous fluid into the wellbore. In this study, numerical simulation is performed to determine the most appropriate operating parameters to maximize oil recovery. The results show that pre-flushed water should be injected until water breakthrough while alternating water slug size should be as low as 5% of polymer slug size. Concentration for each polymer slugs should be kept constant and recommended number of alternative cycles is 2. Combining these operating parameters altogether contributes to oil recovery of 53.69% whereas single-slug polymer flooding provides only 53.04% which is equivalent to 8,000 STB of oil gain.

scholarly journals Multifunctional Composition Based on Surfactants and a Complex of Buffer Systems to Enhance Oil Recovery of High-Viscosity Oil Deposits

2021 ◽  
pp. 30-37
Author(s):  
Liubov K. Altunina ◽  
Vladimir A. Kuvshinov ◽  
Ivan V. Kuvshinov ◽  
Liubov A. Stasyeva
Keyword(s):  
Oil Recovery ◽  
High Viscosity ◽  
Buffer System ◽  
Reaction Products ◽  
Wide Ph Range ◽  
Low Interfacial Tension ◽  
Oil Deposits ◽  
Ph Range ◽  
Enhance Oil Recovery ◽  
High Viscosity Oil

To enhance oil recovery of high-viscosity oil deposits in the temperature range of 20-210 °C, a multifunctional composition with adjustable viscosity and high oil-displacing ability has been developed based on surfactants, aluminum and ammonium salts, an adduct of inorganic acid, carbamide and polyol. High buffer capacity of the composition in a wide pH range, 2.5-10 units pH, is provided by a complex of buffer systems: in the acidic range of pH, 2.5-4.0, the system “polyolboric acid and its salt”, in the alkaline range of pH – anammonia-borate buffer system. The composition has a low interfacial tension, a prolonged reaction with carbonate rocks, prevents the precipitation of insoluble reaction products, and increases the permeability of reservoirs. The composition is both oil-displacing and flow-diverting, it provides an enhance in the oil recovery factor, both due to the increase in the displacement factor and the the reservoir sweep by waterflooding or thermal steam stimulation

Polymer Gelled Technology to Improve Sweep Efficiency in Enhanced Oil Recovery: A Literature Review

2015 ◽  
Vol 1113 ◽  
pp. 690-694 ◽  
Author(s):  
Norfarisha Achim ◽  
Nur Hashimah Alias ◽  
Nurul Aimi Ghazali ◽  
Miradatul Najwa Muhd Rodhi ◽  
Tengku Amran Tengku Mohd ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Polymer Gels ◽  
Fluid Injection ◽  
Potential Candidate ◽  
Polymer Gel ◽  
Excellent Performance ◽  
Sweep Efficiency ◽  
Enhance Oil Recovery ◽  
Permeability Modification

This article is an overview of the use of polymer gelled technology to improve sweep efficiency in enhanced oil recovery. Recent progress use polymer types, Polyacrylamide and polysaccharide to be applied in enhanced oil recovery (EOR). A lot of researchers concluded that polymer gel stability must be maintained to ensure excellent performance in sweep efficiency. The application of polymer gels in permeability modification to improve volumetric sweep efficiency of fluid injection processes showed fruitful efforts as it can be a potential candidate to enhance oil recovery as compared to other technologies.

The Experiment of Viscosity Loss Caused by the Polymer Flow along Transportation Pipeline

2015 ◽  
Vol 733 ◽  
pp. 59-62
Author(s):  
Yue Wang ◽  
Guang Sheng Cao ◽  
Gui Long Wang ◽  
Sheng Kun Sun ◽  
Xin Li
Keyword(s):  
Polymer Solution ◽  
Oil Recovery ◽  
High Viscosity ◽  
Shear Effect ◽  
Solution Flow ◽  
Polymer Flow ◽  
The Core ◽  
Flow Through ◽  
Enhance Oil Recovery ◽  
Viscosity Polymer

By using polymer solution with high viscosity, polymer flooding can enhance oil recovery by reducing the mobility ratio of displacing fluid and oil in formation. Therefore, the core of polymer flooding's ground transportation is to keep the viscosity of polymer solution unchanged. According to the process layout of polymer ground transportation, the experimental device was designed and manufactured to determine viscosity loss of pipelines and elbow. We obtained the viscosity loss variation law of the polymer solutions of different concentrations at different flow velocities when they flow through the pipeline and elbow. The experimental results showed that the viscosity of polymer solution will decrease after the polymer solution flow through pipelines and elbow, due to the shear effect. The higher the velocity, the more significant the viscosity loss.

scholarly journals Experimental Study of Enhancing Oil Recovery with Weak Base Alkaline/Surfactant/Polymer

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Dandan Yin ◽  
Dongfeng Zhao ◽  
Jianfeng Gao ◽  
Jian Gai
Keyword(s):  
Interfacial Tension ◽  
Oil Recovery ◽  
High Viscosity ◽  
Core Flooding ◽  
Displacement Efficiency ◽  
Weak Base ◽  
Water Contact ◽  
Asp Flooding ◽  
Enhance Oil Recovery ◽  
Alkaline Surfactant Polymer

Na2CO3 was used together with surfactant and polymer to form the Alkaline/Surfactant/Polymer (ASP) flooding system. Interfacial tension (IFT) and emulsification of Dagang oil and chemical solutions were studied in the paper. The experiment results show that the ASP system can form super-low interfacial tension with crude oil and emulsified phase. The stability of the emulsion is enhanced by the Na2CO3, surfactant, and the soap generated at oil/water contact. Six core flooding experiments are conducted in order to investigate the influence of Na2CO3 concentration on oil recovery. The results show the maximum oil recovery can be obtained with 0.3 wt% surfactant, 0.6 wt% Na2CO3, and 2000 mg/L polymer. In a heterogeneous reservoir, the ASP flooding could not enhance the oil recovery by reducing IFT until it reaches the critical viscosity, which indicates expanding the sweep volume is the premise for reducing IFT to enhance oil recovery. Reducing or removing the alkali from ASP system to achieve high viscosity will reduce oil recovery because of the declination of oil displacement efficiency. Weak base ASP alkali can ensure that the whole system with sufficient viscosity can start the medium and low permeability layers and enhance oil recovery even if the IFT only reaches 10−2 mN/m.

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