Yi G.,Henan Polytechnic University |
Xing B.,Henan Polytechnic University |
Jia J.,Henan Polytechnic University |
Zhao L.,Petroleum Engineering Research Institute of Dagang Oilfield |
And 3 more authors.
International Journal of Photoenergy | Year: 2014
Macroporous TiO2 photocatalyst was synthesized by a facile nanocasting method using polystyrene (PS) spherical particles as the hard template. The synthesized photocatalyst was characterized by transmission electron microscope (TEM), scanning electron microscopy (SEM), thermogravimetry-differential thermogravimetry (TG-DTG), X-ray diffraction (XRD), and N2-sorption. TEM, SEM, and XRD characterizations confirmed that the macroporous TiO2 photocatalyst is composed of anatase phase. The high specific surface area of 87.85 m2/g can be achieved according to the N2-sorption analysis. Rhodamine B (RhB) was chosen as probe molecule to evaluate the photocatalytic activity of the TiO2 catalysts. Compared with the TiO2 materials synthesized in the absence of PS spherical template, the macroporous TiO2 photocatalyst sintered at 500°C exhibits much higher activity on the degradation of RhB under the UV irradiation, which can be assigned to the well-structured macroporosity. The macroporous TiO2 material presents great potential in the fields of environmental remediation and energy conversion and storage. © 2014 Guiyun Yi et al.
Dong J.,Petroleum Engineering Research Institute of Dagang Oilfield
Drilling Fluid and Completion Fluid | Year: 2015
Two sets of solids-free workover fluids were formulated with natural mineral sulfide scavenger. The adsorption rates of sulfide hydrogen of the workover fluids were as high as 237.33 mg/L. They also had low alkalinity, low corrosivity, did not form scale and were compatible with calcium and magnesium ions, and formation waters. Being solids-free, they posed no damage to reservoirs. Pilot application of the workover fluids in five wells in Dagang Oilfield was successful, average restoration period of these wells was 2 days, and the reservoir formation was proved not damaged by the workover fluids. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.
Dong J.,Petroleum Engineering Research Institute of Dagang Oilfield |
Fan S.,Petroleum Engineering Research Institute of Dagang Oilfield |
Guo Y.,Petroleum Engineering Research Institute of Dagang Oilfield |
Yang X.,Petroleum Engineering Research Institute of Dagang Oilfield |
Zhou X.,Petroleum Engineering Research Institute of Dagang Oilfield
Drilling Fluid and Completion Fluid | Year: 2013
A kind of novel low-density micro-foam workover fluid is developed for low pressure reservoirs, which is composed of foaming agent, active agent and compound foam stabilizing agent, and the micro-foam is formed by one core two films and three layers that is very stable. The experimental evaluation results show that this kind of workover fluid can work in conditions of 130°C and 10 MPa, and has good performances of API filtrate loss 10.3 mL, HTHP filtrate loss 15.6 mL, salt tolerance 10%, calcium tolerance 3%, oil tolerance over 15% and core permeability recovery rate over 89%, as well as the micro-foam can match the leakage ways automatically to prevent lost circulation. The applications of 5 wells are succeeded in 100%, the average recovery rate is 133.8%, and the average recovery time is shorten by 1.6 d, which can protect reservoirs effectively.