Produced water from polymer flooding process in crude oil extraction: characterization and treatment by a novel crossflow oil–water separator

Produced water from polymer flooding (PWfPF) in oilfield is high contents of crude oil, total suspension substance (TSS), hydrolyzed polyacrylamide and salinity. Most existing traditional processes in China are incapable to treat PWfPF to meet the reinjection water quality for low and ultra-low permeability reservoirs. In the present paper, a hydrophilized tubular polyvinylidene fluoride (PVDF) membrane with a total active area of 110 m2 manufactured by our laboratory was used for ultrafiltration of the PWfPF. The temperature and volume reduction factor (VRF) of the PWfPF were fixed at 37 °C and 4, respectively. The influences of transmembrane pressure (TMP) and crossflow velocity on the membrane flux were investigated. The experimental results showed that a TMP of 0.20 MPa and crossflow velocity of 4.5 m/s were the optimum operation conditions. Under the above conditions, long-term filtration experiments were conducted for 12 months to evaluate the effectiveness of the membrane. The obtained results revealed that the membrane average flux could reach 75 L/(m2•h) and the flux recovery was more than 95%. In the permeate, the content of crude oil and turbidity were respectively lower than 1 mg/L and 1 NTU, while the TSS was consistently below detection limits (2.5 mg/L), all of which reached the highest reinjection criteria for oilfield in China and demonstrated that the membrane has a good anti-fouling characteristics to PWfPF.

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Microwave-assisted ultraviolet digestion: an efficient method for the digestion of produced water from crude oil extraction and further metal determination

Journal of Analytical Atomic Spectrometry ◽

10.1039/c7ja00302a ◽

2017 ◽

Vol 32 (12) ◽

pp. 2439-2446 ◽

Cited By ~ 7

Author(s):

J. P. Souza ◽

P. S. Barela ◽

K. Kellermann ◽

M. F. P. Santos ◽

D. P. Moraes ◽

...

Keyword(s):

Ultraviolet Radiation ◽

Crude Oil ◽

Efficient Method ◽

Produced Water ◽

Oil Extraction ◽

Icp Oes ◽

Metal Determination ◽

Microwave Assisted ◽

First Time

Microwave coupled to ultraviolet radiation is proposed for the first time for produced water digestion allowing metal determination by ICP-OES.

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Research on the Differences in the Properties of the Crude Oil between H2O Flooding and Polymer Flooding

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.411-414.2983 ◽

2013 ◽

Vol 411-414 ◽

pp. 2983-2988

Author(s):

Hong Bao Liang ◽

Xiao Na Dong ◽

Ying Chen ◽

Lei Zhang ◽

Xiang Dong Di

Keyword(s):

Interfacial Tension ◽

Crude Oil ◽

Production Rate ◽

Produced Water ◽

Polymer Flooding ◽

Emulsifying Properties ◽

Exhalation Rate ◽

Adsorption Method ◽

Crude Oil Production ◽

The Stability

Abstract: The Polymer is one of the efficient ways to increase to the crude oil production rate,but this method has big impact on the properties of crude oil. We studied the differences between the Polymer flooding sample and H2O flooding sample experimentally.The adsorption method was adopted to analyze the content of resins and asphaltenes in the oil samples. By measuring the exhalation rate of the H2O, the stability of the emulsifying properties which are affected by the resins and asphaltenes were studied. Then, we measured the viscosity and the interfacial tension of the crude oil samples to further explore the differences.The results shows that the contents of resins and asphaltenes and the stability of the emulsion in the Polymer flooding oil sample are all higher than that in the H2O flooding oil sample, the interfacial tension and the viscosity of the produced water in the Polymer flooding oil sample are all lower than that in the H2O flooding oil sample.

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Study on TDS removal from polymer-flooding wastewater in crude oil: extraction by electrodialysis

Desalination ◽

10.1016/j.desal.2008.04.039 ◽

2009 ◽

Vol 244 (1-3) ◽

pp. 90-96 ◽

Cited By ~ 13

Author(s):

Guolin Jing ◽

Xiaoyu Wang ◽

Hai Zhao

Keyword(s):

Crude Oil ◽

Oil Extraction ◽

Polymer Flooding

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Influence of salts, anion polyacrylamide and crude oil on nanofiltration membrane fouling during desalination process of polymer flooding produced water

Desalination ◽

10.1016/j.desal.2015.07.006 ◽

2015 ◽

Vol 373 ◽

pp. 27-37 ◽

Cited By ~ 34

Author(s):

Ruijun Zhang ◽

Wenxin Shi ◽

Shuili Yu ◽

Wei Wang ◽

Zhiqiang Zhang ◽

...

Keyword(s):

Crude Oil ◽

Membrane Fouling ◽

Produced Water ◽

Polymer Flooding ◽

Nanofiltration Membrane

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Research on Multi-Cup Uniform Flow Gravity Sedimentation Single Well Injection-Production Technique

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.341-342.534 ◽

2013 ◽

Vol 341-342 ◽

pp. 534-539

Author(s):

Guo Xing Zheng

Keyword(s):

Produced Water ◽

Water Injection ◽

Uniform Flow ◽

Water Mixture ◽

Production Technique ◽

Water Separator ◽

Single Well ◽

Oil Water ◽

Gravity Sedimentation ◽

Water Cut

When the oilfield enters the hing water cut stage, the mining faces the problem that the oil-gas gathering system energy consumption reduction needs to decrease produced water and water injection. This paper proposes a novel multi-cup uniform flow gravity sedimentation single well injection-production technique. The downhole oil-water separator separates oil from water. The separated water is directly reinjected into the injection layer. Higher oil content of oil-water mixture is lifted up to the ground. The water injection and oil production in the production wellbore are simultaneous. This paper also designs a crown-like sedimentation cup structure. The experiment shows that the optimum structure of crown oil-water separator is cylindrical with 30 inclination, 12 edges and one partition baord on the tip at the bottom of corrugated shape. Produced liquid contains water 95 percent; efficiency can be increased more than three times by using multi-cup uniform flow gravity sedimentation separator.

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Computational Flow Dynamic Simulation of Micro Flow Field Characteristics Drainage Device Used in the Process of Oil-Water Separation

Geofluids ◽

10.1155/2017/8916313 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9

Author(s):

Guangya Jin ◽

Zhijian Liu

Keyword(s):

Flow Field ◽

Crude Oil ◽

Produced Water ◽

Water Separation ◽

Drainage Device ◽

Oil Storage ◽

Flow Field Characteristics ◽

Oil Water Separation ◽

Oil Tank ◽

Oil Water

Aqueous crude oil often contains large amounts of produced water and heavy sediment, which seriously threats the safety of crude oil storage and transportation. Therefore, the proper design of crude oil tank drainage device is prerequisite for efficient purification of aqueous crude oil. In this work, the composition and physicochemical properties of crude oil samples were tested under the actual conditions encountered. Based on these data, an appropriate crude oil tank drainage device was developed using the principle of floating ball and multiphase flow. In addition, the flow field characteristics in the device were simulated and the contours and streamtraces of velocity magnitude at different nine moments were obtained. Meanwhile, the improvement of flow field characteristics after the addition of grids in crude oil tank drainage device was validated. These findings provide insights into the development of effective selection methods and serve as important references for oil-water separation process.

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