252 results match your criteria displacement reservoir

Pore-scale imaging and analysis of low salinity waterflooding in a heterogeneous carbonate rock at reservoir conditions.

Sci Rep 2021 Jul 23;11(1):15063. Epub 2021 Jul 23.

Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, UK.

X-ray micro-tomography combined with a high-pressure high-temperature flow apparatus and advanced image analysis techniques were used to image and study fluid distribution, wetting states and oil recovery during low salinity waterflooding (LSW) in a complex carbonate rock at subsurface conditions. The sample, aged with crude oil, was flooded with low salinity brine with a series of increasing flow rates, eventually recovering 85% of the oil initially in place in the resolved porosity. The pore and throat occupancy analysis revealed a change in fluid distribution in the pore space for different injection rates. Read More

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Seismic Slip-Pulse Experiments Simulate Induced Earthquake Rupture in the Groningen Gas Field.

Geophys Res Lett 2021 Jun 6;48(11):e2021GL092417. Epub 2021 Jun 6.

HPT Laboratory Department of Earth Sciences Utrecht University Utrecht The Netherlands.

Rock materials show dramatic dynamic weakening in large-displacement (m), high-velocity (∼1 m/s) friction experiments, providing a mechanism for the generation of large, natural earthquakes. However, whether such weakening occurs during induced M3-4 earthquakes (dm displacements) is unknown. We performed rotary-shear experiments on simulated fault gouges prepared from the source-, reservoir- and caprock formations present in the seismogenic Groningen gas field (Netherlands). Read More

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Measuring Orthopedic Plate Strain to Track Bone Healing Using a Fluidic Sensor Read via Plain Radiography.

IEEE Trans Biomed Eng 2021 Jun 28;PP. Epub 2021 Jun 28.

Objective: We describe a fluidic X-ray visualized strain indicator under applied load (X-VISUAL) to quantify orthopedic plate strain and inform rehabilitative care.

Methods: The sensor comprises a polymeric device with a fluidic reservoir filled with a radio-dense fluid (cesium acetate) and an adjoining capillary wherein the liquid level is measured. A stainless-steel lever attaches to the plate and presses upon the acrylic bulb with a displacement proportional to plate bending strain. Read More

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A Single-opening&closing Valve Tester for Direct Measurement of Closing Volume of the Heart Valve.

Cardiovasc Eng Technol 2021 Jun 25. Epub 2021 Jun 25.

Department of Mechanical Engineering, Texas Tech University, 2703 7th Street, PO Box 41021, Lubbock, TX, 79409-1021, USA.

Purpose: The objective of this study was to develop a novel single opening&closing pulsatile flow in-vitro valve tester for direct measurement of closing volume of the heart valve.

Methods: A single opening&closing valve tester was composed of a piston pump, valve mounting chamber, reservoir, measurement and control system. The piston pump was used to drive a valve to open and close with dictated flow which comprised three phases of accelerated, constant, and decelerated flow with six slopes. Read More

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Application of Novel Colloidal Silica Nanoparticles in the Reduction of Adsorption of Surfactant and Improvement of Oil Recovery Using Surfactant Polymer Flooding.

ACS Omega 2021 May 19;6(17):11327-11339. Epub 2021 Apr 19.

Department of Petroleum Engineering Indian Institute of Technology (ISM), Enhanced Oil Recovery Laboratory, Dhanbad 826004, India.

Surfactant polymer flooding is one of the most common chemical enhanced oil recovery techniques, which improves not only the microscopic displacement of the fluid through the formation of the emulsion but also the volumetric sweep efficiency of the fluid by altering the viscosity of the displacing fluid. However, one constraint of surfactant flooding is the loss of the surfactant by adsorption onto the reservoir rock surface. Hence, in this study, an attempt has been made to reduce the adsorption of the surfactant on the rock surface using novel colloidal silica nanoparticles (CSNs). Read More

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Surfactant-Enhanced Spontaneous Emulsification Near the Crude Oil-Water Interface.

Langmuir 2021 Apr 7;37(15):4736-4743. Epub 2021 Apr 7.

Reservoir Engineering Research Institute, Palo Alto, California 94301, United States.

Spontaneous emulsification near the oil-water interface and destabilization of water-in-oil emulsions in the bulk oil phase may affect the efficiency of improved oil recovery. In this study, we investigate the effect of a demulsifier surfactant on spontaneous emulsification near the oil-aqueous phase interface and in the bulk oil phase through imaging. The results show that pronounced spontaneous emulsions may form near the oil-aqueous phase interfaces. Read More

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Research on Optimal Blocking Limits and Injection Parameter Optimization of Polymer Microsphere Conformance Control.

ACS Omega 2021 Mar 16;6(12):8297-8307. Epub 2021 Mar 16.

The Unconventional Oil and Gas Institute, China University of Petroleum (Beijing), 18 Fuxue Road, Changping District, Beijing 102249, China.

Polymer microsphere (PM) profile control has been attributed to improving sweep efficiency during the oil development process. The critical factors for PM conformance control are the plugging properties controlled by matching the relationship between the throat diameter and particle size and the injection parameters. A new matching relationship between the reservoir and PM based on the function of blocking rate and the ratio of throat diameter to microsphere diameter ( ) is established to choose the most appropriate PM size. Read More

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Experimental Investigation of Polymer-Coated Silica Nanoparticles for EOR under Harsh Reservoir Conditions of High Temperature and Salinity.

Nanomaterials (Basel) 2021 Mar 18;11(3). Epub 2021 Mar 18.

PoreLab Research Centre, Department of Geoscience and Petroleum, Norwegian University of Science and Technology (NTNU), S. P. Andersens veg 15a, 7031 Trondheim, Norway.

Laboratory experiments have shown higher oil recovery with nanoparticle (NPs) flooding. Accordingly, many studies have investigated the nanoparticle-aided sweep efficiency of the injection fluid. The change in wettability and the reduction of the interfacial tension (IFT) are the two most proposed enhanced oil recovery (EOR) mechanisms of nanoparticles. Read More

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Vertex Displacement-Based Discontinuous Deformation Analysis Using Virtual Element Method.

Materials (Basel) 2021 Mar 6;14(5). Epub 2021 Mar 6.

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.

To avoid disadvantages caused by rotational degrees of freedom in the original Discontinuous Deformation Analysis (DDA), a new block displacement mode is defined within a time step, where displacements of all the block vertices are taken as the degrees of freedom. An individual virtual element space (Ω) is defined for a block to illustrate displacement of the block using the Virtual Element Method (VEM). Based on VEM theory, the total potential energy of the block system in DDA is formulated and minimized to obtain the global equilibrium equations. Read More

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Micromodel Studies of Surfactant Flooding for Enhanced Oil Recovery: A Review.

ACS Omega 2021 Mar 24;6(9):6064-6069. Epub 2021 Feb 24.

State Key Laboratory of Petroleum and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China.

Micromodels have been widely used to visualize surfactant flooding, which provides new insights into understanding pore-scale events during displacement. In this review, recent advances in micromodel studies of surfactant flooding are briefly summarized. The mechanisms of surfactant flooding as demonstrated by micromodel studies are presented, as well as pore-scale findings that cannot be captured by traditional coreflood methods. Read More

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Potential Role of Birds in Japanese Encephalitis Virus Zoonotic Transmission and Genotype Shift.

Viruses 2021 02 24;13(3). Epub 2021 Feb 24.

Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, Shanghai 200241, China.

Japanese encephalitis (JE) is a vaccine-preventable disease caused by the Japanese encephalitis virus (JEV), which is primarily prevalent in Asia. JEV is a Flavivirus, classified into a single serotype with five genetically distinct genotypes (I, II, III, IV, and V). JEV genotype III (GIII) had been the most dominant strain and caused numerous outbreaks in the JEV endemic countries until 1990. Read More

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February 2021

Environmental tradeoffs in municipal wastewater treatment plant upgrade: a life cycle perspective.

Environ Sci Pollut Res Int 2021 Jul 4;28(26):34913-34923. Epub 2021 Mar 4.

School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian, 116024, Liaoning, China.

Municipal wastewater treatment plants (WWTPs) play an indispensable role in improving environmental water quality in urban areas. Existing WWTPs, however, are an important source of greenhouse gas (GHG) emissions and may not be able to treat increasingly complicated wastewater or meet stringent environmental standards. These WWTPs can be updated to address these challenges, and different technologies are available but with potentially different environmental implications. Read More

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Achieving the Super Gas-Wetting Alteration by Functionalized Nano-Silica for Improving Fluid Flowing Capacity in Gas Condensate Reservoirs.

ACS Appl Mater Interfaces 2021 Mar 26;13(9):10996-11006. Epub 2021 Feb 26.

College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.

It is well-known that the production of gas-condensate reservoirs is significantly affected by the liquid condensation near the wellbore region. Gas-wetting alteration can be one of the most effective approaches to alleviate condensate accumulation and improve liquid distribution. However, gas well deliverability is still limited because the wettability of cores is altered only from liquid-wetting to intermediate gas-wetting by using traditional chemical stimulation. Read More

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Effect of Displacement Pressure on Oil-Water Relative Permeability for Extra-Low-Permeability Reservoirs.

ACS Omega 2021 Feb 21;6(4):2749-2758. Epub 2021 Jan 21.

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, P. R. China.

The oil-water relative permeability is an important parameter to characterize the seepage law of fluid in extra-low-permeability reservoirs, and it is of vital significance for the prediction and evaluation of the production. The pore throat size of extra-low-permeability reservoirs is relatively small, and the threshold pressure gradient and capillary pressure cannot be negligible. In this study, the oil-water relative permeability experiments with three different displacement pressures were carried out on the same core from the extra-low-permeability reservoir of Chang 4+5 formation in Ordos basin by the unsteady experimental method. Read More

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February 2021

Imbibition and Oil Recovery Mechanism of Fracturing Fluids in Tight Sandstone Reservoirs.

ACS Omega 2021 Jan 8;6(3):1991-2000. Epub 2021 Jan 8.

School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China.

The fracturing fluid residing in a reservoir undergoes spontaneous imbibition. Here, to explore the mechanism of fracturing fluid imbibition and oil displacement, experiments on the spontaneous imbibition of fracturing fluid under different influencing factors were conducted on a core sample from the Ordos Basin of the Chang 8 formation. Combined with nuclear magnetic resonance technology, we quantitatively evaluated the degree of oil production of different pores during the fracturing fluid displacement process. Read More

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January 2021

Water-flooding characteristics of lithologic reservoir in Ordos basin.

Sci Rep 2021 Jan 28;11(1):2503. Epub 2021 Jan 28.

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069, China.

Due to the poor situation of water-flooding mechanism research on Chang 4 + 5 reservoir of Ordos basin, the authors quantitatively studied the influence factors of water-flooding characteristics by sedimentology, casting thin sections, constant-speed mercury injection, scanning electron microscope as well as production records. The size and distribution of pore-throat were also found closely related with the water-flooding seepage law. The results show that the microscopic seepage paths of Chang 4 + 5 reservoir include uniform displacement, finger displacement and peak displacement, and their correspondent oil displacement efficiency reduces in turn under the same conditions. Read More

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January 2021

Isolating, identifying and evaluating of oil degradation strains for the air-assisted microbial enhanced oil recovery process.

PLoS One 2021 25;16(1):e0243976. Epub 2021 Jan 25.

Institute of Chemical and Safety Engineering, Binzhou University, Binzhou, Shandong, People's Republic of China.

Due to the inefficient reproduction of microorganisms in oxygen-deprived environments of the reservoir, the applications of microbial enhanced oil recovery (MEOR) are restricted. To overcome this problem, a new type of air-assisted MEOR process was investigated. Three compounding oil degradation strains were screened using biochemical experiments. Read More

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New Method for Quantitative Prediction of Liquid Flowback Based on the Capillary Bundle Model.

ACS Omega 2021 Jan 18;6(1):465-475. Epub 2020 Dec 18.

Gudong Oil Production Plant, Sinopec Shengli Oilfield Company, Dongying, Shandong 257237, China.

Liquid invasion damage plays a main role in the formation damage of low-permeability sandstone reservoirs. The long-term retention of working fluid in the formation will cause serious water blocking damage. In order to research the quantitative prediction of liquid flowback in low-permeability sandstone reservoirs, a new method for quantitative prediction of liquid flowback based on the capillary bundle model was proposed, which took into account the boundary layer effect. Read More

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January 2021

Experimental Study on Injection and Plugging Effect of Core-Shell Polymer Microspheres: Take Bohai Oil Reservoir as an Example.

ACS Omega 2020 Dec 4;5(49):32112-32122. Epub 2020 Dec 4.

State Key Laboratory of Efficient Development of Offshore Oil, Beijing 100028, China.

To meet the technical requirements of deep fluid diversion in Bohai oilfield, the swelling property, plugging effect, transport characteristics of polymer microspheres, and fluid diversion effect in heterogeneous cores are studied in this paper. There are two kinds of polymer microspheres including core-shell microspheres and traditional microspheres. The instruments used in this study include a biomicroscope, a metallurgical microscope, a scanning electron microscope, and core displacement experimental devices. Read More

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December 2020

The Study to Improve Oil Recovery through the Clay State Change during Low Salinity Water Flooding in Sandstones.

ACS Omega 2020 Nov 12;5(46):29816-29829. Epub 2020 Nov 12.

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, P.R. China.

Low salinity water flooding is a low-cost enhanced oil recovery (EOR) technology. The mechanism of EOR in a sandstone reservoir is still controversial, and there are many influencing factors. In this study, the effects of salinity (2000, 4000, 8000, and 100,000 ppm), pH (5. Read More

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November 2020

Experimental Investigation on a Novel Polyelectrolyte Molecular Deposition Film for Improved Injectivity in Low-Permeability Reservoirs.

ACS Omega 2020 Nov 9;5(45):29300-29311. Epub 2020 Nov 9.

CNPC Xinjiang Oilfield Company, Karamay 834000, China.

Acrylamide and dimethyl diallyl ammonium chloride were used as monomers to synthesize a polyelectrolyte molecular deposition film (PMDF) injection agent for solving the problem of high injection pressure of water wells in low-permeability reservoirs. The structure of the PMDF injection agent was determined through IR and H nuclear magnetic resonance (NMR). The performance evaluation results show a change of wettability from hydrophilic to neutral wetting with the contact angle changing from 22. Read More

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November 2020

In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil.

Sensors (Basel) 2020 Nov 15;20(22). Epub 2020 Nov 15.

Three Gorges Research Center for Geo-Hazards, China University of Geosciences, Wuhan 430074, China.

Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. Read More

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November 2020

Arm mobilization provokes deformity of long-term indwelling ports implanted via the jugular vein.

J Vasc Surg Venous Lymphat Disord 2021 Jul 31;9(4):998-1006. Epub 2020 Oct 31.

Vascular Surgery Department, Hospital Israelita Albert Einstein, São Paulo, Brazil.

Background: The incidence of totally implantable catheter fracture ranges from 0.48% to 5.00%, and these fractures represent a potentially fatal complication. Read More

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Occurrence of metacercariae of Austrodiplostomum compactum (Lutz, 1928) (Trematoda, Diplostomidae) in Pimelodus platicirris in the Ilha Solteira Reservoir, São Paulo, Brazil.

An Acad Bras Cienc 2020 19;92(suppl 2):e20180649. Epub 2020 Oct 19.

Programa de Pós-Graduação em Ciências Biológicas - Zoologia, Universidade Estadual Paulista/UNESP, Câmpus de Botucatu, Instituto de Biociências, Rua Prof. Dr. Antônio Celso Wagner Zanin, 250, 18618-689 Botucatu, SP, Brazil.

This study reports the occurrence of metacercariae of Austrodiplostomum compactum in Pimelodus platicirris from a Neotropical reservoir in the Grande River, SP, Brazil. A total of 164 fish were collected, of which 12.80% were infected with metacercariae in the eyes. Read More

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November 2020

Anomalous diffusion of a quantum Brownian particle in a one-dimensional molecular chain.

Phys Rev E 2020 Sep;102(3-1):032137

Center for Complex Quantum Systems, The University of Texas at Austin, Austin, Texas 78712, USA.

We discuss anomalous relaxation processes of a quantum Brownian particle which interacts with an acoustic phonon field as a thermal reservoir in one-dimensional chain molecule. We derive a kinetic equation for the particle using the complex spectral representation of the Liouville-von Neumann operator. Due to the one-dimensionality, the momentum space separates into infinite sets of disjoint irreducible subspaces dynamically independent of one another. Read More

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September 2020

Role of Phase-Dependent Dielectric Properties of Alumina Nanoparticles in Electromagnetic-Assisted Enhanced Oil Recovery.

Nanomaterials (Basel) 2020 Oct 6;10(10). Epub 2020 Oct 6.

Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan.

The utilization of metal-oxide nanoparticles in enhanced oil recovery (EOR) has generated considerable research interest to increase the oil recovery. Among these nanoparticles, alumina nanoparticles (AlO-NPs) have proved promising in improving the oil recovery mechanism due to their prominent thermal properties. However, more significantly, these nanoparticles, coupled with electromagnetic (EM) waves, can be polarized to reduce water/oil mobility ratio and create disturbances at the oil/nanofluid interface, so that oil can be released from the reservoir rock surfaces and travelled easily to the production well. Read More

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October 2020

Pore- and Core-Scale Insights of Nanoparticle-Stabilized Foam for CO-Enhanced Oil Recovery.

Nanomaterials (Basel) 2020 Sep 25;10(10). Epub 2020 Sep 25.

Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway.

Nanoparticles have gained attention for increasing the stability of surfactant-based foams during CO foam-enhanced oil recovery (EOR) and CO storage. However, the behavior and displacement mechanisms of hybrid nanoparticle-surfactant foam formulations at reservoir conditions are not well understood. This work presents a pore- to core-scale characterization of hybrid nanoparticle-surfactant foaming solutions for CO EOR and the associated CO storage. Read More

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September 2020

Synthesis and Solution Properties of a Novel Hyperbranched Polymer Based on Chitosan for Enhanced Oil Recovery.

Polymers (Basel) 2020 Sep 18;12(9). Epub 2020 Sep 18.

School of Chemistry and Chemical Engineering of Southwest Petroleum University, Chengdu 610500, Sichuan, China.

A new type of chitosan-modified hyperbranched polymer (named HPDACS) was synthesized through the free-radical polymerization of surface-modified chitosan with acrylic acid (AA) and acrylamide (AM) to achieve an enhanced oil recovery. The optimal polymerization conditions of HPDACS were explored and its structure was characterized by Fourier-transform infrared spectroscopy, hydrogen nuclear magnetic resonance, and environmental scanning electron microscopy. The solution properties of HPDACS in ultrapure water and simulated brine were deeply studied and then compared with those of partially hydrolyzed polyacrylamide (HPAM) and a dendritic polymer named HPDA. Read More

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September 2020

Dynamics of water injection in an oil-wet reservoir rock at subsurface conditions: Invasion patterns and pore-filling events.

Phys Rev E 2020 Aug;102(2-1):023110

Department of Earth Science and Engineering, Imperial College London, London SW7 2BP, United Kingdom.

We use fast synchrotron x-ray microtomography to investigate the pore-scale dynamics of water injection in an oil-wet carbonate reservoir rock at subsurface conditions. We measure, in situ, the geometric contact angles to confirm the oil-wet nature of the rock and define the displacement contact angles using an energy-balance-based approach. We observe that the displacement of oil by water is a drainagelike process, where water advances as a connected front displacing oil in the center of the pores, confining the oil to wetting layers. Read More

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Selecting the Best Image Pairs to Measure Slope Deformation.

Wentao Yang

Sensors (Basel) 2020 Aug 21;20(17). Epub 2020 Aug 21.

Three-Gorges Reservoir Area (Chongqing) Forest Ecosystem Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.

Optical remote sensing images can be used to monitor slope deformation in mountain regions. Abundant optical sensors onboard various platforms were designed to provide increasingly high spatial-temporal resolution images at low cost; however, finding the best image pairs to derive slope deformation remains difficult. By selecting a location in the east Tibetan Plateau, this work used the co-registration of optically sensed images and correlation (COSI-Corr) method to analyze 402 Sentinel-2 images from August 2015 to February 2020, to quantify temporal patterns of uncertainty in deriving slope deformation. Read More

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