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The HPA/Bi2WO6was prepared with Na2WO4·2H2O, Bi(NO3)3·5H2O and different surfactant templates. The prepared sample was dried by the supercritical fluid drying (SCFD) method. It was characterized with XRD, FT-IR and SEM techniques and N2sorption experiment. Its photocatalytic properties were evaluated with denitrification of nitrogen-containing simulated oil as model reaction. It was shown that the sodium dodecyl sulfate (SDS) should be chosen as template. With this template, a highly dispersed, crystalline and active photocatalyst was obtained. This catalyst had a larger specific surface area. The SCFD method effectively decreased pore collapse and particles agglomeration degree, consequently increasing the specific surface area and improving the catalytic performance. Immobilization of H3PW12O40on Bi2WO6increased the surface acid sites, and hence the photocatalytic activity. When the H3PW12O40loading was 10%, about 92.08% of nitrogen in simulated oil were removed by shining for 3 h with a xenon lamp at the mcatalysts/msimulated oilratio of 1:100.

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.

The three basic criterions of pumping unit were analyzed. The criterions could be extracted from power curve of pumping unit in one stroke. When the pumping unit was adjusted by one criterion, it could also fit the other criterions. Under this condition the pumping unit could be considered as well balance. The practical testing and data prove that the pumping unit can meet the requirements of criterion one and two, approach criterion three after adjusting by power method.