caa a22 4500 445299436 CHVBK 20180317142552.0 cr unu---uuuuu 170323e20100101xx s 000 0 eng 10.1007/s11430-009-0184-y doi (NATIONALLICENCE)springer-10.1007/s11430-009-0184-y Characteristics of remaining oil viscosity in water- and polymer-flooding reservoirs in Daqing Oilfield [Elektronische Daten] [ZhengShun Xu, JuHe Zhang, ZiHui Feng, Wei Fang, FengLan Wang] The experimental analysis of 21 crude oil samples shows a good correlation between high molecular-weight hydrocarbon components (C40 +) and viscosity. Forty-four remaining oil samples extracted from oil sands of oilfield development coring wells were analyzed by high-temperature gas chromatography (HTGC), for the relative abundance of C21 −, C21-C40 and C40 + hydrocarbons. The relationship between viscosity of crude oil and C40 + (%) hydrocarbons abundance is used to expect the viscosity of remaining oil. The mobility characteristics of remaining oil, the properties of remaining oil, and the next displacement methods in reservoirs either water-flooded or polymer-flooded are studied with rock permeability, oil saturation of coring wells, etc. The experimental results show that the hydrocarbons composition, viscosity, and mobility of remaining oil from both polymer-flooding and water-flooding reservoirs are heterogeneous, especially the former. Relative abundance of C21 − and C21-C40 hydrocarbons in polymer-flooding reservoirs is lower than that of water-flooding, but with more abundance of C40 + hydrocarbons. It is then suggested that polymer flooding must have driven more C40 − hydrocarbons out of reservoir, which resulted in relatively enriched C40 +, more viscous oils, and poorer mobility. Remaining oil in water-flooding reservoirs is dominated by moderate viscosity oil with some low viscosity oil, while polymer-flooding mainly contained moderate viscosity oil with some high viscosity oil. In each oilfield and reservoir, displacement methods of remaining oil, viscosity, and concentration by polymer-solution can be adjusted by current viscosity of remaining oil and mobility ratio in a favorable range. A new basis and methods are suggested for the further development and enhanced oil recovery of remaining oil. Science in China Press and Springer Berlin Heidelberg, 2009 remaining oil nationallicence viscosity nationallicence mobility ratio nationallicence water-flooding nationallicence polymer-flooding nationallicence heterogeneity nationallicence polymer-solution viscosity nationallicence Xu ZhengShun Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut Zhang JuHe Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut Feng ZiHui Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut Fang Wei Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut Wang FengLan Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut Science in China Series D: Earth Sciences SP Science in China Press 53/1(2010-01-01), 72-83 1674-7313 53:1<72 2010 53 11430 https://doi.org/10.1007/s11430-009-0184-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-009-0184-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Xu ZhengShun Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut NATIONALLICENCE 700 1- Zhang JuHe Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut NATIONALLICENCE 700 1- Feng ZiHui Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut NATIONALLICENCE 700 1- Fang Wei Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut NATIONALLICENCE 700 1- Wang FengLan Exploration and Development Research Institute, Daqing Oilfield Company Ltd., 163712, Daqing, China aut NATIONALLICENCE 773 0- Science in China Series D: Earth Sciences SP Science in China Press 53/1(2010-01-01), 72-83 1674-7313 53:1<72 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer