Efficient oil recovery from highly stable toxic oily sludge using supercritical water

Fuel ◽  
2019 ◽  
Vol 235 ◽  
pp. 460-472 ◽  
Author(s):  
Muhammad Kashif Khan ◽  
Handi Setiadi Cahyadi ◽  
Sung-Min Kim ◽  
Jaehoon Kim
Keyword(s):  
Supercritical Water ◽  
Oil Recovery ◽  
Oily Sludge

scholarly journals Enhanced Separation of Oil and Solids in Oily Sludge by Froth Flotation at Normal Temperature

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2163
Author(s):  
Wenying Li ◽  
Hongyang Lin ◽  
Yang Yang ◽  
Zhenxiao Shang ◽  
Qiuhong Li ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Oil Content ◽  
Froth Flotation ◽  
Hazardous Materials ◽  
Impeller Speed ◽  
Oily Sludge ◽  
Shear Effect ◽  
Flotation Reagent ◽  
Shengli Oilfield ◽  
Pulp Viscosity

Oily sludge (OS) contains a large number of hazardous materials, and froth flotation can achieve oil recovery and non-hazardous disposal of OS simultaneously. The influence of flotation parameters on OS treatment and the flotation mechanism were studied. OS samples were taken from Shengli Oilfield in May 2017 (OSS) and May 2020 (OST), respectively. Results showed that Na2SiO3 was the suitable flotation reagent treating OSS and OST, which could reduce the viscosity between oil and solids. Increasing flotation time, impeller speed and the ratio of liquid to OS could enhance the pulp shear effect, facilitate the formation of bubble and reduce pulp viscosity, respectively. Under the optimized parameters, the oil content of OST residue could be reduced to 1.2%, and that of OSS could be reduced to 0.6% because of OSS with low heavy oil components and wide solid particle size distribution. Orthogonal experimental results showed that the impeller speed was the most significant factor of all parameters for OSS and OST, and it could produce shear force to decrease the intensity of C-H bonds and destabilize the OS. The oil content of residue could be reduced effectively in the temperature range of 24–45 °C under the action of high impeller speed.

Biosurfactants as demulsifying agents for oil recovery from oily sludge – performance evaluation

2013 ◽  
Vol 67 (12) ◽  
pp. 2875-2881 ◽  
Author(s):  
Evans M. N. Chirwa ◽  
Tshepo Mampholo ◽  
Oluwademilade Fayemiwo
Keyword(s):  
Oil Recovery ◽  
Sodium Dodecyl ◽  
Cost Effective ◽  
Solid Particles ◽  
Second Step ◽  
Oily Sludge ◽  
Waste Sludge ◽  
Complex Interactions ◽  
Oil Water ◽  
Living Organisms

The oil producing and petroleum refining industries dispose of a significant amount of oily sludge annually. The sludge typically contains a mixture of oil, water and solid particles in the form of complex slurry. The oil in the waste sludge is inextractible due to the complex composition and complex interactions in the sludge matrix. The sludge is disposed of on land or into surface water bodies thereby creating toxic conditions or depleting oxygen required by aquatic animals. In this study, a fumed silica mixture with hydrocarbons was used to facilitate stable emulsion (‘Pickering’ emulsion) of the oily sludge. The second step of controlled demulsification and separation of oil and sludge into layers was achieved using either a commercial surfactant (sodium dodecyl sulphate (SDS)) or a cost-effective biosurfactant from living organisms. The demulsification and separation of the oil layer using the commercial surfactant SDS was achieved within 4 hours after stopping mixing, which was much faster than the 10 days required to destabilise the emulsion using crude biosurfactants produced by a consortium of petrochemical tolerant bacteria. The recovery rate with bacteria could be improved by using a more purified biosurfactant without the cells.

Lumped kinetics for supercritical water oxidation of oily sludge

2011 ◽  
Vol 89 (3) ◽  
pp. 198-203 ◽  
Author(s):  
Bao-chen Cui ◽  
Shu-zhi Liu ◽  
Fu-yi Cui ◽  
Guo-lin Jing ◽  
Xian-jun Liu
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Oily Sludge ◽  
Supercritical Water Oxidation

scholarly journals Oily Sludge Recovery using Microwave Pyrolysis Technique

2021 ◽  
Vol 37 (1) ◽  
pp. 40-45
Author(s):  
Khamael M. Abualnaja ◽  
Hala M. Abo-Dief ◽  
Ola A. Abu Ali ◽  
Abdullah Al-Anazi ◽  
Ashraf T. Mohamed
Keyword(s):  
Heating Rate ◽  
Oil Recovery ◽  
Calorific Value ◽  
Oily Sludge ◽  
Pyrolysis Oil ◽  
Nitrogen Flow Rate ◽  
Microwave Pyrolysis ◽  
Pyrolysis Oils ◽  
Temperature Heating ◽  
Pyrolysis Gases

The oily sludge treatments catch widespread attention. But, management of sludge is difficult and costly undertaking. The oil recovery pyrolysis temperature, heating rate and carbon wt.% is discussed. The recovered aliphatic, aromatic, elemental components and gases were obtained with respect to the nitrogen flow rate. The present work showed that as the heating rate increases, both the %pyrolysis oil and gases increases up to 600 OC, while the %pyrolysis char decreases. Beyond 600 OC, the pyrolysis gases% increases, the pyrolysis oil% decreases while the %pyrolysis char continuous decreases. Gas chromatography, and calorific value used to examine the hydrocarbon compositions of the virgin, sludge, and pyrolysis oils.

Flowback Stimulation of Frac Fluid in Tight Oil Reservoirs Through Supercritical Condition

2021 ◽  
Author(s):  
Ying Li ◽  
Ying Ai ◽  
Haitao Li ◽  
Mingjun Chen
Keyword(s):  
Molecular Weight ◽  
Hydraulic Fracturing ◽  
Supercritical Water ◽  
Oil Recovery ◽  
Oil Reservoirs ◽  
Fracturing Fluid ◽  
Tight Sandstone ◽  
Water Condition ◽  
Water Hydraulic ◽  
Oil Components

Abstract Tight sandstone reservoirs are an important petroleum resources in recent years. Hydraulic fracturing is widely used to stimulate development of tight sandstone oil reservoirs by creating underground fractures, but the low flowback rate of fracturing fluid leads to the water blocking damage and low oil recovery of tight sandstone oil reservoirs compared with those of conventional oil reservoirs. The object of this study is to experimentally investigate the possibility of improving flowback efficiency and oil recovery efficiency through achievement of the supercritical water condition. Self-developed reaction system is used to conduct hydraulic fracturing for tight sandstone samples under both regular and supercritical conditions. While comparing the oil recovery factor and flowback efficiency of the regular and supercritical water hydraulic fracturing, mechanisms behind these results are explored through examination of the change in oil components, the change in rock minerals and the change in pore-fracture distribution. Results show that the dynamic viscosity of the crude oil after the supercritical water hydraulic fracturing is significantly lower than that before hydraulic fracturing, with a decrease of 2.88 mPa·s under ambient condition and a decrease of 0.39 mPa·s under in situ condition. Lighter oil components occupy more percentage of the totoal oil components in the recovered oil from supercritical water hydraulic fracturing than that in the oil recovered from regular hydraulic fracturing, with an average increase of 16% for the oil components of molecular weight from 100 to 200. Heavier oil components of molecular weight larger than 300 have an average decrease of 15.5% after the supercritical water hydraulic fracturing. This indicate the visbreaking of the crude oil under the supercritical water condition. Oil recovery after supercritical water hydraulic fracturing is always higher than that after regular hydraulic fracturing, and the ultimate oil recovery after supercritical water hydraulic fracturing is 66.5% compared with 60% of regular hydraulic fracturing. Fracturing fluid after the supercritical water condition flows much quicker and smoothly than that after the regular hydraulic fracturing, and the ultimate flow back factor of the fracturing fluid is 63% after the supercritical water hydraulic fracturing compared with that of 49% after the regular hydraulic fracturing. Increase in percentage of larger pores/fractures after the supercritical water hydraulic fracturing is more significant than that after regular hydraulic fracturing. The percentage of interstratified illite-montmorillonite decreases an average of 15.2%, while that of kaolinite increase an average of 14.3% in the rock samples after supercritical water hydraulic fracturing compared with the original rock samples. This will benefit the recovery process when oil and water flows together into the well bore after the hydraulic fracturing.

A Comprehensive Model for Simulating Supercritical-Water Flow in a Vertical Heavy-Oil Well

SPE Journal ◽  
2021 ◽  
pp. 1-16
Author(s):  
Jiaxi Gao ◽  
Yuedong Yao ◽  
Dawen Wang ◽  
Hang Tong
Keyword(s):  
Heat Transfer ◽  
Supercritical Water ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Flow Direction ◽  
Flow Characteristics ◽  
Transfer Model ◽  
Oil Well ◽  
Horizontal Wellbore ◽  
Predicted Values

Summary Supercritical water has been proved effective in heavy-oil recovery. However, understanding the flow characteristics of supercritical water in the wellbore is still in the early stages. In this paper, using the theory of heat transfer and fluid mechanics and combining that with the physical properties of supercritical water, a heat-transfer model for vertical wellbore injection with supercritical water is established. The influence of heat transfer and the Joule-Thomson effect on the temperature of supercritical water are considered. Results show the following: The predicted values of pressure and temperature are in good agreement with the test values. The apparent pressure of supercritical water at the upper end of the wellbore is lower than the apparent pressure at the lower end. However, the equivalent pressure of supercritical water at the upper end of the wellbore is higher than the equivalent pressure at the lower end. The apparent pressure of supercritical water is affected by three factors: flow direction, overlying pressure, and Joule-Thomsoneffect. The closer to the bottom of the well, the greater the overlying pressure of the supercritical water, resulting in an increase in apparent pressure and the density of the supercritical water. As the injection time for supercritical water increases, the temperature around the upper horizontal wellbore increases.

Oil recovery from refinery oily sludge via ultrasound and freeze/thaw

2012 ◽  
Vol 203-204 ◽  
pp. 195-203 ◽  
Author(s):  
Ju Zhang ◽  
Jianbing Li ◽  
Ronald W. Thring ◽  
Xuan Hu ◽  
Xinyuan Song
Keyword(s):  
Oil Recovery ◽  
Oily Sludge ◽  
Freeze Thaw

Research on Treatment Technology as Resource of Polymer-Containing Oily Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 2677-2682 ◽  
Author(s):  
Xian Qing Yin ◽  
Fei Fei Hu ◽  
Bo Jing ◽  
Jian Zhang ◽  
Xi Zhou Shen ◽  
...  
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Sewage Treatment ◽  
Oil Field ◽  
Oily Sludge ◽  
Processing Plant ◽  
Environment Protection ◽  
Treatment Technology ◽  
Oil Water ◽  
Separating Agent

With the rapid implementation of polymer flooding in Bohai oil field, the produced liquid includes large amount of polymer-containing oily sludge reversed increases year by year. The polymer-containing oily sludge accumulates at the terminal processing plant, which not only obviously degrades the performance of sewage treatment instruments and blocks the oil/water separators, but also has a bad impact on environment. Using thermal chemical treatment technology with dynamical separating agent and optimizing separation conditions, the completed processing technology is obtained as follow: thermal chemical reaction, separation on standing, crude oil recovery and recycling of waste water. The recovery rate of crude oil from the samples treatment is over 94%. The obtained technology plays an important role in recycling of source, environment protection and technical support of increasing produced liquid.

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