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• W2016579760 abstract "Abstract This paper shows how to develop the light/medium heavy oil reservoirs and to optimize the production in ND offshore oilfield by using experimental and numerical technologies. The reservoirs in ND oilfield which has large reserves of the light/medium heavy oil (viscosity from 50 to 750 mPa·s) are very complex; faults are well developed and divide the oilfield into many blocks. The current drive mechanism is a water flooding or natural depletion bringing the average pressure down sharply, and reaches its production/economic limit in some of the similar offshore heavy oil reservoirs. The low primary recovery factor and the potentially vast remaining oil in these reservoirs necessitates considering applying improved oil recovery technologies for reservoirs in ND oilfield. Both physical tests and numerical simulations on different kinds of flooding schemes are examined and compared in this paper to enhance the recovery of light/medium heavy oil reservoirs. More specifically, water flooding schemes under different injected water temperatures (50oC, 150oC, 200oC), gas flooding schemes using carbon dioxide/natural gas medium, WAG schemes by carbon dioxide are conducted respectively. Other flooding schemes, such as cyclic steaming, steam flooding and combustion process are not investigated since they are normally unable to perform well in light/medium heavy oil reservoirs. We also present an example of the use of the ND-B1 reservoir as a typical model by simulating the flooding schemes. The results of numerical simulation were derived for comparing with experiments parameters. This paper provides a good reference for other similar reservoirs in China to recover light/medium viscosity heavy oil. Introduction ND oilfield was discovered in 1979. There are several offshore reservoirs in the oilfield and the viscosity of the crude oil mainly ranges from 50 mPa·s to 750 mPa·s. Many literatures 1–10 indicated that cyclic steaming, steam flooding and combustion process may not achieve good production for light/medium heavy oil 11, 12. Due to its relatively high oil viscosity and the heterogeneity of thick pay zones, the oil recovery in this kind of oilfield after the waterflooding stage perhaps is quite low (less than 18%) comparing with other similar offshore reservoirs in china. In order to find the best developing technique for ND Oilfield, detection and drilling exploration has been conducted since its discovery, attempting to obtain a better understanding on its geological structures, detailed topography and the internal structure. Moreover, two of the reservoirs named ND-A and B are chosen to do pilot tests, which are viewed as the key to long-term future of the ND oilfield. ND-A reservoir consists of several oil sand bodies, with the depth varying from 1180.4 to 1405.3m, According to the formation properties, the whole reservoir is categorized to six different oil sands, which are 4# oil sand(7–11877–1199), 14# oil sand(1–1308), 17# oil sand(7–1317), 18# oil sand(1–1336/3–1348/4–1334), 19# oil sand(6–1325/2–1334)and 22# oil sand (2–1389), respectively. ND-B reservoir has two oil sand bodies. The properties of the heavy oil in ND-A and B reservoirs are shown in Table 1. It is not economic to apply thermal recovery techniques in ND Oilfield due to its thin layers and the presence of the bottom water. Initial development program is designed to investigate the effects of key parameters on the displacement process, such as medium, rate, time of the injection and different well patterns, while considering geological and fluid characteristics of ND-A and B reservoirs, respectively. Results of this simulation program offer an advisable recommendation and plans for the development of the ND oilfield, and are partially shown in this paper." @default.
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• W2016579760 date "2008-11-03" @default.
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• W2016579760 title "Experimental and Numerical Comparison of Flooding Schemes to Enhance Recovery of Light/Medium Heavy Oil in an Offshore Oilfield" @default.
• W2016579760 doi "https://doi.org/10.2118/118226-ms" @default.
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