scholarly journals A novel silica-supported polyether polysiloxane quaternary ammonium demulsifier for highly efficient fine-sized oil droplet removal of oil-in-water emulsions

RSC Advances ◽  
2020 ◽  
Vol 10 (32) ◽  
pp. 18918-18926 ◽  
Author(s):  
Mengjin Zhai ◽  
Mian Wu ◽  
Cunying Wang ◽  
Xiaobing Li
Keyword(s):  
Quaternary Ammonium ◽  
Produced Water ◽  
Separation Efficiency ◽  
Polymer Flooding ◽  
Oil Droplet ◽  
Highly Efficient ◽  
Oil In Water

The existence of fine-sized oil drops that are difficult to coalesce greatly decreases the separation efficiency of produced water from alkali, surfactant, and polymer flooding technology (ASP) containing oil-in-water emulsions.

scholarly journals Influence of Membrane Vibration on Particles Rejection Using a Slotted Pore Membrane Microfiltration

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 709
Author(s):  
Asmat Ullah ◽  
Kamran Alam ◽  
Saad Ullah Khan ◽  
Victor M. Starov
Keyword(s):  
Membrane Fouling ◽  
Produced Water ◽  
Separation Efficiency ◽  
Membrane Surface ◽  
Water Separation ◽  
Oil Droplet ◽  
Pore Blockage ◽  
Oil Water Separation ◽  
Microfiltration Membranes ◽  
Membrane Vibration

A new method is proposed to increase the rejection in microfiltration by applying membrane oscillation, using a new type of microfiltration membrane with slotted pores. The oscillations applied to the membrane surface result in reduced membrane fouling and increased separation efficiency. An exact mathematical solution of the flow in the surrounding solution outside the oscillating membrane is developed. The oscillation results in the appearance of a lift velocity, which moves oil particles away from the membrane. The latter results in both reduced membrane fouling and increased oil droplet rejection. This developed model was supported by the experimental results for oil water separation in the produced water treatment. It was proven that the oil droplet concentration was reduced notably in the permeate, due to the membrane oscillation, and that the applied shear rate caused by the membrane oscillation also reduced pore blockage. A four-times lower oil concentration was recorded in the permeate when the membrane vibration frequency was 25 Hz, compared to without membrane vibration. Newly generated microfiltration membranes with slotted pores were used in the experiments.

The Effect of Droplet Diameter on the Separation of Heavy-Oil from Water Using a Hydrocyclone

2010 ◽  
Vol 303-304 ◽  
pp. 131-137 ◽  
Author(s):  
F.P.M. Farias ◽  
C.J.O. Buriti ◽  
W.C.P. Barbosa de Lima ◽  
S.R.F. Neto ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Heavy Oil ◽  
Produced Water ◽  
Volume Fraction ◽  
Separation Efficiency ◽  
Droplet Diameter ◽  
Separation Performance ◽  
Drop Volume ◽  
Oil Droplet ◽  
Produced Water Treatment ◽  
Continuous Stream

The hydrocyclone is an alternative for produced water treatment in the petroleum industries, especially at offshore fields. Many parameters, such as oil droplet diameter affect the separation performance of the hydrocyclone. In this sense, the purpose of this work is study the effect of oil droplet diameter and inlet fluid on the separation efficiency of a hydrocyclone to remove dispersed heavy-oil from a water continuous stream. Results of the streamline, pressure drop, volume fraction and efficiency of separation as a function of oil droplet diameter and feed velocity are presented and analyzed.

scholarly journals Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4435 ◽  
Author(s):  
Dennis Severin Hansen ◽  
Stefan Jespersen ◽  
Mads Valentin Bram ◽  
Zhenyu Yang
Keyword(s):  
Oil And Gas ◽  
Produced Water ◽  
Separation Efficiency ◽  
Measurement Techniques ◽  
High Sensitivity ◽  
Calibration Method ◽  
Least Square ◽  
Oil In Water ◽  
Before And After ◽  
The Government

Offshore oil and gas facilities are currently measuring the oil-in-water (OiW) concentration in the produced water manually before discharging it into the ocean, which in most cases fulfills the government regulations. However, as stricter regulations and environmental concerns are increasing over time, the importance of measuring OiW in real-time intensifies. The significant amount of uncertainties associated with manual samplings, that is currently not taken into consideration, could potentially affect the acceptance of OiW monitors and lower the reputation of all online OiW measurement techniques. This work presents the performance of four fluorescence-based monitors on an in-house testing facility. Previous studies of a fluorescence-based monitor have raised concerns about the measurement of OiW concentration being flow-dependent. The proposed results show that the measurements from the fluorescence-based monitors are not or insignificantly flow-dependent. However, other parameters, such as gas bubbles and droplet sizes, do affect the measurement. Testing the monitors’ calibration method revealed that the weighted least square is preferred to achieve high reproducibility. Due to the high sensitivity to different compositions of atomic structures, other than aromatic hydrocarbons, the fluorescence-based monitor might not be feasible for measuring OiW concentrations in dynamic separation facilities with consistent changes. Nevertheless, they are still of interest for measuring the separation efficiency of a deoiling hydrocyclone to enhance its deoiling performance, as the separation efficiency is not dependent on OiW trueness but rather the OiW concentration before and after the hydrocyclone.

The Stability and Breakage of Oil-in-water From Polymer Flooding Produced Water

2013 ◽  
Vol 31 (20) ◽  
pp. 2082-2088 ◽  
Author(s):  
D. X. Liu ◽  
X. T. Zhao ◽  
W. Liang ◽  
J. W. Li
Keyword(s):  
Produced Water ◽  
Polymer Flooding ◽  
Oil In Water ◽  
The Stability

Reviewing Cyclonic Low-Shear Choke and Control Valve Field Experiences

2021 ◽  
pp. 1-16
Author(s):  
Trygve Husveg ◽  
Rune Husveg ◽  
Niels van Teeffelen ◽  
Robert Verwey ◽  
Peter Guinee
Keyword(s):  
Produced Water ◽  
Separation Efficiency ◽  
Environmental Influence ◽  
Water Concentration ◽  
Control Valve ◽  
Third Party ◽  
Control Valves ◽  
Oil In Water ◽  
And Control ◽  
Low Shear

Summary In hydrocarbon production and processing, choke and control valves mix and emulsify petroleum phases. The consequence is often that the efficiency of separation processes is affected and finally that the quality of oil and water phases is degraded. Over the last few years, low-shear valves targeting petroleum processes have emerged on the market. This paper presents four separate live-fluid experiences from low-shear valve installations, each surveyed and documented by an independent third party. Three of the installations refer to choke valves, whereas the fourth installation refers to a control valve. For each installation, standard choke and control valves were used as reference valves. In terms of downstream separation efficiency, the low-shear choke valves reduced oil-in-water concentrations respectively by 70, 45, and 60%, by total average. In the control valve application, the low-shear valve, which was located between the hydrocyclones and a compact flotation unit, reduced the oil-in-water concentration by 23%. In sum, the field installations have demonstrated that low-shear valves significantly and consistently reduce oil-in-water concentrations and thus improve the produced water quality. The results signify that low-shear valves may be used in debottlenecking separation and produced water treatment processes, reducing the environmental influence from produced water discharges. Because the low-shear technology enables processing of petroleum phases with less effort, energy, and chemicals, it also reduces emissions to air.

scholarly journals Band Engineering and Morphology Control of Oxygen-Incorporated Graphitic Carbon Nitride Porous Nanosheets for Highly Efficient Photocatalytic Hydrogen Evolution

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yunyan Wu ◽  
Pan Xiong ◽  
Jianchun Wu ◽  
Zengliang Huang ◽  
Jingwen Sun ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Physical Adsorption ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Hydrogen Evolution ◽  
Band Engineering ◽  
Highly Efficient

AbstractGraphitic carbon nitride (g-C3N4)-based photocatalysts have shown great potential in the splitting of water. However, the intrinsic drawbacks of g-C3N4, such as low surface area, poor diffusion, and charge separation efficiency, remain as the bottleneck to achieve highly efficient hydrogen evolution. Here, a hollow oxygen-incorporated g-C3N4 nanosheet (OCN) with an improved surface area of 148.5 m2 g−1 is fabricated by the multiple thermal treatments under the N2/O2 atmosphere, wherein the C–O bonds are formed through two ways of physical adsorption and doping. The physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects, leading to the formation of hollow morphology, while the O-doping results in reduced band gap of g-C3N4. The optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6 μmol g−1 h−1 for ~ 20 h, which is over four times higher than that of g-C3N4 (850.1 μmol g−1 h−1) and outperforms most of the reported g-C3N4 catalysts.

Cost-Efficient De-Bottlenecking of Produced Water Treatment Systems through the Application of a Single Technology, Eliminating the Need for Hydrocyclones and Degassing Drums

2021 ◽  
Author(s):  
Steinar Asdahl ◽  
Johann Jansen van Rensburg ◽  
Martin Einarson Waag ◽  
Rune Glenna Nilssen
Keyword(s):  
Water Treatment ◽  
Produced Water ◽  
Separation Efficiency ◽  
Water System ◽  
Treatment Technology ◽  
Two Stage ◽  
Water Separation ◽  
Design Capacity ◽  
New Process ◽  
Produced Water Treatment

Abstract Traditionally, produced water from production separators is handled by multiple steps and different technologies in order to meet the required quality for either discharge or reinjection of the water. The development of the latest Compact Flotation Unit (CFU) technology has unlocked the potential for savings on cost, complexity, footprint and weight for the produced water treatment system. The developed CFU technology has proven applicable through field testing as a single treatment technology for reducing Oil-in-Water (OiW) content directly from tie-in at separator and still meet stringent requirements for outlet OiW quality. Field tests were conducted with inlet OiW concentration ranging from 200-2000 ppm, achieving results in the range 2.5 to 21 ppm only with a two-stage latest generation CFU. Compared to a traditional produced water system setup consisting of de-oiling hydrocyclones and a horizontal degassing vessel, the savings in footprint and operational weight is estimated to 54 % and 53 % respectively utilizing a two-stage CFU for a system with a design capacity of 76.000 BWPD. Furthermore, the development of the latest generation CFU technology has enabled the retrofit concept, incorporating the developed CFU internals into existing gravity separation based produced water vessels, converting them to more efficient flotation vessels with increased capacity. For brownfield and debottlenecking applications, operators are challenged by increasing water cut from maturing wells, and as a result exceeding the facilities design capacity for produced water treatment. This challenge is often further reinforced by increasingly stricter environmental legislation for OiW content for discharge or re-injection. The retrofit concept will offer a highly cost-, footprint- and weight-efficient solutions to these challenges utilizing existing vessels. Benefits of the retrofit concept: Bring proven and unique performance of the technology to other produced water separation vessels helping the operators improve the separation efficiency and increase throughput while meeting discharge requirementsShort execution time compared to installation of new process equipmentLow cost compared to installation of new process equipmentUtilization of existing equipment saves valuable footprint.

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