Analytical solutions of critical oil film thickness of negative spreading coefficient in a capillary corner
2
Citation
45
Reference
10
Related Paper
Citation Trend
Keywords:
Capillary pressure
Contact angle measurements are important to determine surface and interfacial tension between solids and fluids. A ‘water-wet’ condition on the rock face is necessary in order to extract oil. In this research, the objectives are to determine the wettability (water-wet or oil-wet), analyze how different brine concentrations will affect the wettability, and study the effect of the temperature on the dynamic contact angle measurements. This will be carried out by using the Cahn Dynamic Contact Angle. Analyzer DCA 315 to measure the contact angle between different fluids such as surfactant, alkaline, and mineral oil. This instrument is also used to measure the surface properties such as surface tension, contact angle, and interfacial tension of solid and liquid samples by using the Wilhelmy technique. The work used different surfactant and oil mixed with different alkaline concentrations. Varying alkaline concentrations from 20ml to 1ml were used, whilst keeping the surfactant concentration constant at 50ml.. It was observed that contact angle measurements and surface tension increase with increased alkaline concentrations. Therefore, we can deduce that they are directly proportional. We noticed that changing certain values on the software affected our results. It was found that after calculating the density and inputting it into the CAHN software, more accurate readings for the surface tension were obtained. We anticipate that the surfactant and alkaline can change the surface tension of the solid surface. In our research, surfactant is desirable as it maintains a high surface tension even when alkaline percentage is increased.
Wilhelmy plate
Mineral oil
Brine
Cite
Citations (0)
Experiments were performed on transparent two‐dimensional microfluidic porous systems to investigate the relationships among capillary pressure and the interfacial areas per volume between two fluid phases and one solid phase. Capillary pressures were calculated from the observed interfacial curvature of the wetting‐nonwetting interface, and these correlated closely to externally measured values of applied pressure. For each applied pressure, the system established mechanical equilibrium characterized by stationary interfaces, uniform curvatures across the model, and random surface normals. To study the relationships among capillary pressure and the interfacial areas, we compare the curvature‐based capillary pressure with the differential change in interfacial areas per volume as a function of wetting‐phase saturation. The differential pressure contributions calculated from the experimental measurements are found to be nearly independent of the measured capillary pressure. These results suggest that other contributions to the capillary pressure must be significant when imbibition and drainage processes result in saturation gradients.
Capillary pressure
Imbibition
Capillary length
Saturation (graph theory)
Capillary surface
Cite
Citations (39)
Abstract High capillary pressure has a significant effect on the phase behavior of fluid mixtures. The capillary pressure is high in unconventional reservoirs due to the small pores in the rock, so including the effect of capillary pressure on phase behavior is necessary for reliable modeling of unconventional shale gas and tight oil reservoirs. We show that the tangent plane distance method cannot be used to determine phase stability and present a rigorous thermodynamic analysis to determine phase stability with capillary pressure. We then demonstrate that there is a maximum capillary pressure (Pcmax) where capillary equilibrium is possible and derive the necessary equations to obtain this maximum capillary pressure. We also discuss the implementation of the capillary equilibrium in a general purpose compositional reservoir simulator and the numerical challenges involved with its application to unconventional reservoirs. Three simulation case studies for gas condensate and tight oil reservoirs were performed to illustrate the influence of capillary pressure on production behavior. These results clarify the influence of capillary pressure on production behavior in low-permeability reservoirs. We show that the choice of the capillary pressure function and parameters significantly affects the results.
Capillary pressure
Relative permeability
Petroleum reservoir
Reservoir Simulation
Cite
Citations (34)
A new method named polymer plating was developed for surface modification of stainless steel plates with different functional groups of organic solutions.The polymer-plated films on the surface of stainless steel plates were characterized by Fourier transform infrared spectra,contact angle and surface free energy.Compared with untreated stainless steel plate,the surface polymer-plated by TTN possessed hydrophilic characteristic with higher surface free energy and lower contact angle of distilled water,however,the polymer-plated films by DHN and AF17N had hydrophobic feature with lower surface free energy and higher contact angle of distilled water,where AF17N polymer-plated surface obtained optimal hydrophobicity because of the lowest surface free energy and the highest contact angles.This technique achieved the hydrophilic/hydrophobic modification on surface of stainless steel,and provided a method for fabricating polymeric function film with different wettability.
Distilled water
Surface Modification
Cite
Citations (0)
The capillary rise technique has been used to experimentally study the “surface tension” of liquid marbles formed by encapsulating water droplets with polytetrafluoroethylene (PTFE) powder of 1, 35, and 100 μm particle size. In a typical experiment, a glass capillary tube was inserted into a water marble to measure the capillary rise of the water. The Laplace pressure exerted by the water marble was directly measured by comparing the capillary rise data from the marble and from a flat water surface in a beaker. An equation to calculate the water marble surface tension based on the Murmar’s model is then proposed. It is also justified how the capillary rise measurements the liquid marble surface tension does not require the water contact angle with any solid surface to be considered; which therefore makes a simple but efficient method for determining liquid marble surface tension. A discussion on the nature and the realistic magnitude of liquid marble surface tension is offered.
Laplace pressure
Tension (geology)
Glass tube
Capillary surface
Capillary pressure
Polytetrafluoroethylene
Cite
Citations (1)
Surface Modification
Cite
Citations (36)
Surface tension is a crucial property of liquids that depends on the liquid's composition. This study aims to compare the surface tension of water, chloroform, and acetone using the capillary rise method. It involves using a capillary tube with a known radius, dipping it vertically into a liquid, and measuring the height to which the liquid rises in the tube. The surface tension of the liquid can then be measured experimentally. This relates to height of the liquid in the tube, the radius of the tube, and the surface tension of the liquid. The height of the liquid in the tube is dependent on the radius of the tube, with a smaller radius resulting in a greater height. The surface tension of the liquid is inversely related to the radius of the capillary tube.
Tension (geology)
Capillary length
Capillary surface
Cite
Citations (0)
The purpose of this study is to measure contact angle and surface tension of liquid Fe-Si-B alloys at high temperature using sessile drop method. The surface tension and contact angle result is based on sessile drop method by use of a digital camera to take the drop profile and fit the profile by Youngs-Laplace equation. The surface tension of liquid Fe-Si-B alloy and its dependence on temperature has been studied. Contact angles of this liquid alloy on various refractories substrate have been determined using this instrument. The result showed that the contact angles and surface tension of Fe-4Si-3B alloy liquid drop on Al 2 O 3 substrate have value of 134 to 127and 1575-1350 mN/m respectively. The result indicated also that increasing temperature can decrease contact angle and surface tension in Fe-Si-B alloy.
Cite
Citations (2)
Hysteresis
Cite
Citations (62)
The influence of different kinds of surfactant on the surface tension of acid solution and the contact angle of rock is different.The relationship between the cleanup efficiency and the surface tension and the contact angle is studied.The surface tension and the contact angle and the cleanup efficiencies of nonionic surfactant,fluorcarbon surfactant and cationic surfactant are measured.The results indicate that and the increase of the contact angle has the same importance as the decrease of the surface tension to the cleanup efficiency of the acid containing surfactant.The quantitative relationship between the cleanup efficiency and the surface tension and the contact angle is presented.The study result of this paper is applied to the development of high-performance cleanup additive,and the optimized experiments show that the cleanup efficiency can reach to 90% when the mass ratio of FX-2 to CTAB to OP-8 is 1∶2∶2 and the concentration of surfactant is 800 mg/L.
Cationic polymerization
Cite
Citations (1)