Pilot Performance of Chemical Demulsifier on the Demulsification of Produced Water from Polymer/Surfactant Flooding in the Xinjiang Oilfield
| Autor: | Min Yang, Feng Li, Dong Chen, Gao Yingxin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:Hydraulic engineering
Geography Planning and Development Polyacrylamide 02 engineering and technology Aquatic Science demulsification 01 natural sciences Biochemistry chemistry.chemical_compound lcsh:Water supply for domestic and industrial purposes Pulmonary surfactant polymer/surfactant flooding lcsh:TC1-978 0103 physical sciences Zeta potential Water Science and Technology lcsh:TD201-500 010304 chemical physics Ethylene oxide Chemistry Cationic polymerization demulsifier 021001 nanoscience & nanotechnology Demulsifier Produced water Chemical engineering Emulsion produced water interfacial rheology 0210 nano-technology |
| Zdroj: | Water, Vol 10, Iss 12, p 1874 (2018) Water Volume 10 Issue 12 |
| ISSN: | 2073-4441 |
| Popis: | Purification of produced water (PW) from polymer/surfactant flooding is a challenge for the petroleum industry due to the high emulsion stability. Demulsification using chemical demulsifiers has been expected to be an effective way to treat PW. In this paper, five cationic (branched quaternary ammonium chloride) and four nonionic (copolymer of propylene oxide and ethylene oxide) demulsifiers with different molecular weights were employed to test their respective demulsification performance in the treatment of PW from polymer/surfactant flooding. The cationic demulsifiers, in general, exhibited better performance than the nonionic ones and one cationic demulsifier (CP-1) exhibiting the best demulsification efficiency was further employed for a pilot experiment in the Xinjiang Oilfield. The oil content of PW could be successfully reduced from 128~7364 to less than 10 mg/L with a dosage of CP-1 for 350 mg/L and polyaluminum chloride (PAC, 30% w/w Al2O3) for 500 mg/L under ambient temperature (14~22 ° C). At the same time, partially hydrolyzed polyacrylamide (HPAM) was removed from 176.9~177.1 to 2.8~3.9 mg/L while petroleum sulfonate was not removed too much (from 35.5~43.8 to 25.5~26.5 mg/L). The interfacial rheology analysis on simulated PW from HPAM/petroleum sulfonate flooding revealed that the addition of CP-1 led to a significant increase of the oil-water interfacial tension (from 7 to 15~20 mN/m) and zeta potential (from &minus 32.5 to &minus 19.7 mV). It was, thus, assumed that the decreased net charge on the dispersed oil droplets surface and weakened oil/water film due to the formation of complex between the cationic demulsifier and HPAM may have facilitated the destabilization of the emulsion. The result of this study is useful in better understanding the demulsification processes as well as selecting suitable demulsifiers in the treatment of PW from polymer/surfactant flooding. |
| Databáze: | OpenAIRE |
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