A numerical investigation on the heat flow in the process of oil-water displacement in SDPSO

2020 ◽  
Vol 34 (32) ◽  
pp. 2050364
Author(s):  
Pan-Pan Han ◽  
Yun-Xiang You ◽  
Dong-Xi Liu ◽  
Jin Wang
Keyword(s):  
Heat Flow ◽  
Heat Conductivity ◽  
Deep Ocean ◽  
Interpolation Scheme ◽  
Water Displacement ◽  
Oil Storage ◽  
New Type ◽  
Oil Water ◽  
Harmonic Interpolation ◽  
Temperature Equation

Spar Drilling Production Storage and Offloading (SDPSO) is a new type of deep ocean platform developed in recent years. The process of oil-water displacement is used for oil storage and offloading and the research on the accompanying heat flow has been significant. The wax precipitation and solidification at low temperature will particularly affect the flowing of oil in the displacement process. When the heat flow is concerned, numerical simulation requires large computation. It is necessary to develop an efficient numerical method for this calculation. As a kind of interface tracking method, the volume of fluid (VOF) method needs less computing resources compared with other multiphase numerical methods. As for thermal expressions, there are mainly two kinds of governing equations, i.e. temperature equation and enthalpy equation, and two kinds of interpolation scheme of heat conductivity, i.e. algebraic interpolation scheme and harmonic interpolation scheme. There is a need to find out which combination of governing equation and interpolation scheme of heat conductivity would result in a better precision for the heat flow. Therefore, four non-isothermal solvers, corresponding to the four combinations, are established. After comparison with an analytical solution, it is found that the temperature equation together with the harmonic interpolation scheme of heat conductivity results in better precision.

A high precision computing method for heat transfer in the process of oil-water displacement

2021 ◽  
Vol 33 (5) ◽  
pp. 958-969
Author(s):  
Pan-pan Han ◽  
Ke Chen ◽  
Dong-xi Liu ◽  
Yun-xiang You ◽  
Jin Wang
Keyword(s):  
Heat Transfer ◽  
High Precision ◽  
Water Displacement ◽  
Oil Water ◽  
Computing Method

Numerical method for interfacial heat transfer in an oil‐water displacement flow

Heat Transfer ◽  
2020 ◽  
Author(s):  
Panpan Han ◽  
Ke Chen ◽  
Yunxiang You ◽  
Jingjing Zhang
Keyword(s):  
Heat Transfer ◽  
Numerical Method ◽  
Interfacial Heat Transfer ◽  
Water Displacement ◽  
Oil Water

Dynamics of oil/water displacement in capillary tubes with periodically varying diameter

1982 ◽  
Vol 260 (8) ◽  
pp. 808-810 ◽  
Author(s):  
�. Kiss ◽  
J. Pint�r ◽  
E. Wolfram
Keyword(s):  
Water Displacement ◽  
Capillary Tubes ◽  
Oil Water

scholarly journals Impact of aeration and deaeration of switchable vacuum insulations on the overall heat conductivity using different core materials and filling gases

2020 ◽  
Vol 11 (4) ◽  
pp. 395-404
Author(s):  
Lars Erlbeck ◽  
S. Sonnick ◽  
D. Wössner ◽  
H. Nirschl ◽  
M. Rädle
Keyword(s):  
Silica Gel ◽  
Heat Conductivity ◽  
High Heat ◽  
Vacuum Insulation ◽  
Aeration Time ◽  
Helium Gas ◽  
New Type ◽  
Insulation Effect ◽  
Backbone Structure ◽  
Core Materials

Abstract Investigating switchable vacuum insulation panels might lead to a new type of insulation, which can be switched on to enable a low heat flow when a good insulation effect is desired and switched off when exchange with the environment is requested, during a cold summer night, for example. For this reason, different core materials for vacuum insulations as typical silica powder were investigated as well as silica agglomerates and silica gel. These materials were checked for the necessary time of aeration and evacuation and the corresponding change of heat conductivity along with the change of gas-pressure. Silica gel in combination with helium as filling gas showed best results corresponding to a high difference of the heat conductivities evacuated and aerated. Beside the solid backbone structure of the silica gel, this is caused by the high heat conductivity and small kinetic atomic diameter of the helium gas. Silica agglomerates decreased the aeration time as well as the deaeration time, but the improvement was neglected because of a lower change of heat conductivity during pressure drop or rise. Nevertheless, a good switchable vacuum insulation can be produced using silica gel and helium, for example.

scholarly journals Experimental Investigation on Oil Enhancement Mechanism of Hot Water Injection in tight reservoirs

Open Physics ◽  
2016 ◽  
Vol 14 (1) ◽  
pp. 703-713 ◽  
Author(s):  
Hao Yongmao ◽  
Lu Mingjing ◽  
Dong Chengshun ◽  
Jia Jianpeng ◽  
Su Yuliang ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Water Saturation ◽  
Water Injection ◽  
Hot Water ◽  
Water Flooding ◽  
Water Displacement ◽  
Pore Characteristics ◽  
Irreducible Water Saturation ◽  
Tight Reservoirs ◽  
Oil Water

AbstractAimed at enhancing the oil recovery of tight reservoirs, the mechanism of hot water flooding was studied in this paper. Experiments were conducted to investigate the influence of hot water injection on oil properties, and the interaction between rock and fluid, petrophysical property of the reservoirs. Results show that with the injected water temperature increasing, the oil/water viscosity ratio falls slightly in a tight reservoir which has little effect on oil recovery. Further it shows that the volume factor of oil increases significantly which can increase the formation energy and thus raise the formation pressure. At the same time, oil/water interfacial tension decreases slightly which has a positive effect on production though the reduction is not obvious. Meanwhile, the irreducible water saturation and the residual oil saturation are both reduced, the common percolation area of two phases is widened and the general shape of the curve improves. The threshold pressure gradient that crude oil starts to flow also decreases. It relates the power function to the temperature, which means it will be easier for oil production and water injection. Further the pore characteristics of reservoir rocks improves which leads to better water displacement. Based on the experimental results and influence of temperature on different aspects of hot water injection, the flow velocity expression of two-phase of oil and water after hot water injection in tight reservoirs is obtained.

A higher resolution edge-based finite volume method for the simulation of the oil-water displacement in heterogeneous and anisotropic porous media using a modified IMPES method

2016 ◽  
Vol 82 (12) ◽  
pp. 953-978 ◽  
Author(s):  
Rogério Soares da Silva ◽  
Paulo Roberto Maciel Lyra ◽  
Ramiro Brito Willmersdorf ◽  
Darlan Karlo Elisiário de Carvalho
Keyword(s):  
Porous Media ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Water Displacement ◽  
Anisotropic Porous Media ◽  
Oil Water ◽  
Edge Based ◽  
Volume Method

Research on Measurement Method of Oil-Water Interface Based on Oscillation Frequency

2011 ◽  
Vol 317-319 ◽  
pp. 1026-1030
Author(s):  
Pei Guo Hou ◽  
Xiang Zheng Xiao ◽  
Zhong Dong Wang
Keyword(s):  
Measurement Method ◽  
Present Situation ◽  
High Water ◽  
Water Interface ◽  
Capacitive Sensing ◽  
New Type ◽  
Simple Interface ◽  
Oil Water ◽  
Control Water ◽  
Water Ratio

At the view of the present situation of the oil-water interface measurement, all sorts of measurement method can not eliminate the interference of temperature and hang oil. In order to control water ratio of purification oil at the output, simple interface detector cannot have satisfy the actual needs. A key contribution of this paper is to propose a solution based on a new type of sensor head and a test of new solution to the problem of capacitive sensing at high water ratio. A LC oscillation circuits is used to detect the variation of capacitance, overcoming the influence of the hang oil and the temperature.

scholarly journals Dielectric Properties and Substantiation of Electromagnetic Technologies for Oil Sludge Processing

2020 ◽  
Author(s):  
Eldar Rinatovich Abdeev ◽  
Minikhan Abuzarovich Fatykhov ◽  
Rail Idiatovich Saitov ◽  
Rinat Gazizyanovich Abdeev ◽  
Lenart Minnehanovich Fatykhov
Keyword(s):  
Electromagnetic Field ◽  
Dielectric Properties ◽  
Atmospheric Oxygen ◽  
Experimental Studies ◽  
Solid Particles ◽  
Oil Sludge ◽  
Water Contact ◽  
Long Term Storage ◽  
Oil Storage ◽  
Oil Water

In the process of reception, storage and preparation of oil for processing, significant volumes of oil-containing sludge are formed, which are not only a source of pollution, but also a valuable hydrocarbon feedstock. Long-term storage of oil with water, contact with atmospheric oxygen, and the presence of solid particles hydrophobized with asphalt-resinous and paraffinous substances contribute to the formation of “intermediate layers” in these sludges, which are ultra-stable oil-water emulsions. It is proposed to use the energy of the electromagnetic field of the high and microwave ranges when developing a technology for the destruction of oil-water emulsions. After analyzing the composition of the oil sludge, experimental studies were conducted of the dielectric loss tangenttgδδ of oil with the addition of sand and paraffin, depending on the frequency of electromagnetic oscillations in the range of 30 - 160 MHz and temperature in the range of 25 - 80 ∘ С using the cumeter method. Studies have shown that two technologies for the disposal of oil sludge are possible: HF and UHF methods. To assess the effectiveness of their application, it is necessary to conduct experimental studies of the dielectric properties of oil sludge. Keywords: oil sludge, oil sludge disposal,oil storage, oil-water emulsions, electromagnetic field

scholarly journals Surface-Modified Nanofibrous PVDF Membranes for Liquid Separation Technology

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2702 ◽  
Author(s):  
Evren Boyraz ◽  
Fatma Yalcinkaya ◽  
Jakub Hruza ◽  
Jiri Maryska
Keyword(s):  
Tio2 Nanoparticles ◽  
Polyvinylidene Fluoride ◽  
Cost Effective ◽  
Second Step ◽  
Separation Technology ◽  
New Type ◽  
Oil Water ◽  
Green Separation ◽  
Surface Modified ◽  
Near Future

Preparing easily scaled up, cost-effective, and recyclable membranes for separation technology is challenging. In the present study, a unique and new type of modified polyvinylidene fluoride (PVDF) nanofibrous membrane was prepared for the separation of oil–water emulsions. Surface modification was done in two steps. In the first step, dehydrofluorination of PVDF membranes was done using an alkaline solution. After the first step, oil removal and permeability of the membranes were dramatically improved. In the second step, TiO2 nanoparticles were grafted onto the surface of the membranes. After adding TiO2 nanoparticles, membranes exhibited outstanding anti-fouling and self-cleaning performance. The as-prepared membranes can be of great use in new green separation technology and have great potential to deal with the separation of oil–water emulsions in the near future.

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