Application of a polytetrafluoroethylene (PTFE) flat membrane for the treatment of pre-treated ASP flooding produced water in a Daqing oilfield

Abstract

ASP (alkaline/surfactant/polymer) flooding oilfield wastewater, which is commonly produced in the oil extraction process, contains high organic content, and the waste crude oil, water resources and sewage need to be treated prior to re-injection. In this study, pre-treated ASP flooding oil field water produced in Daqing, China, was treated by a PTFE microfiltration membrane and the removal efficiency of main pollutants in oil field-produced water was studied. The contents of oil and suspended solids (SS) in the permeate obtained with the membranes were 1.15 mg/L and 1.61 mg/L, respectively, which met the re-injected water quality standards in China. Microscopic analysis of fouling showed that the membrane pollutants were mainly composed of petroleum organic pollutants, and a small amount of SiO2, CaCO3, MgCO3 and other inorganic pollutants was observed. Accordingly the operating conditions of the operating flux, back-washing cycle, back-washing flux and gas-washing flux were investigated to decrease the membrane fouling.

Pilot study on the effects of operating parameters on membrane fouling during ultrafiltration of alkali/surfactant/polymer flooding wastewater: optimization and modeling

“…The suspended solids (SS) content was analysed by a weight method: 100 mL of a water sample was passed through a 0.22 mm microlter, and the retentate was dried in an oven at 103-105 C until the retention weight did not change (#0.4 mg). 38 The median particle diameter was analysed by a ZETA nanometre particle size analyser (Nano S, Malvern, England).…”

Efficiencies and mechanisms of the chemical cleaning of fouled polytetrafluoroethylene (PTFE) membranes during the microfiltration of alkali/surfactant/polymer flooding oilfield wastewater

“…1. It mainly consisted of a raw wastewater tank of volume 0.06125 m 3 , a membrane tank of volume 0.018 m 3 , an effluent tank, constant ow pumps, pressure transducers, and a data acquisition system. The at membrane modules were vertically put in the membrane tank, which was installed inside the raw wastewater tank.…”

“…In recent decades, alkali/surfactant/polymer (ASP) ooding oileld wastewater is being increasingly produced during the oil recovery process. [1][2][3] This wastewater needs to be processed prior to getting discharged into the environment to avoid the risk of severe pollution caused by its organic and inorganic components. 1 Many countries that possess oilelds are seeking efficient and cost effective methods to manage this wastewater.…”

“…[7][8][9] Microltration (MF) is considered to be one of the most effective membrane applications among the membrane separation processes for oileld wastewater treatment. 2,3,10 However, the pH of the wastewater has been observed to exceed the tolerable limit of commonly used MF membranes, which signicantly shortens the membrane lifespan and increases operating costs. As an MF membrane, polytetrauoroethylene (PTFE) is considered to be the best due to its high resistance to strong acids and alkalis, high and low temperatures, and corrosion.…”

Study on Demulsification-Flocculation Mechanism of Oil-Water Emulsion in Produced Water from Alkali/Surfactant/Polymer Flooding

“…They proved the economic viability of treatment process recovery of oil from oily wastewater. Zhang et al [30] investigated the removal efficiency of PTFE film on the main pollutants of ASP produced water and proved that PTFE film also achieves a good treatment effect of produced water. Miao et al [31] studied the effect of asphaltene on oil-water interface properties.…”