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Dong P.-L.,Gudong Oil Production Plant | Lv Q.,China University of Petroleum - East China | Wang W.-J.,China University of Petroleum - East China | Chen S.-H.,China University of Petroleum - East China | And 3 more authors.
Mocaxue Xuebao/Tribology | Year: 2015

Non-equilibrium molecular dynamics simulation was carried out to study the delamination and velocity slippage phenomenon of the hexadecane lubricating film at nanoscale. In this work, the effect of shear velocity on the velocity slippage phenomenon was studied, and the microscopic mechanism of the phenomenon was explored. Results show that delamination occurred in the lubricating film under the shear action of the iron walls. The middle region of the lubricating film exhibited the features of bulk fluid when the film thickness reached 50 Å. The critical shear rates of the interlamination slippage and interfacial slippage were 5.5 and 7.5 Å/ps, respectively. With increasing shear velocity, the interfacial slippage was strengthened and the interfacial slippage was weakened. The degree of the interlamination slippage was determined by the number of bridging molecules between the first and second layers of the lubricating film. The increasing shear velocity reduced the number of the bridging molecules, which therefore weakened the interlamination slippage. © 2015, Science Press. All right reserved. Source


Luo S.-L.,Gudong Oil Production Plant | Zeng L.-F.,Gudong Oil Production Plant | Li L.-X.,Gudong Oil Production Plant | Yan X.-Y.,China National Petroleum Corporation
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2010

Lower Es3 of Bijia fault block in Binnan Oilfield which contains as many as 58 oil subzones vertically belongs to the oilfield of multi-layer sandstone and strong heterogeneity reservoir. With the development of exploitation, conflicts between these layers are increasing. On the basis of comprehensive analysis of geologic features and development characteristics of the oilfield, we propose a criterion for quantitatively classifying development zones by hierarchical clustering subzones with K-means method, which proves effective in directing classification of development layers. In this paper, we presents the layer division criterion, based on which we divided Lower Es3 of Bijia fault block in Binnan Oilfield into three sets of development zones and also directed by economical theory and numerical simulation technology. Research practice shows that the presented layer division method using K-means is reliable, and the oil recovery is obviously enhanced. Source

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