Changing characteristics of ultralow permeability reservoirs during waterflooding operations |
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Authors: | Gao Chunning An Xiaoping Zhu Shengju and Wu Pingcang |
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Affiliation: | National Engineering Laboratory for Exploration & Development of Low Permeability Oil and Gas Fields, Xi'an, Shaanxi 710018, China;Exploration & Development Research Institute of Changqing Oilfield Company, Xi'an, Shaanxi 710018, China |
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Abstract: | The characteristics of ultralow permeability reservoirs changed after waterflooding. Thinsection analysis and scanning electron microscopy (SEM) of core samples from inspection wells indicated that calcite and barite were formed in ultralow permeability reservoirs during waterflooding operations. Some asphaltene precipitates on the surface of formation rock would influence the reservoir porosity,
permeability, wettability, and electrical properties. In this paper, the changes of physical, electrical, and fluid properties of ultralow permeability reservoirs during waterflooding operations were analyzed. This provides important information to improve waterflooding performance in ultralow permeability reservoirs. |
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Keywords: | Ultralow permeability waterflooding reservoir change waterflooding characteristics |
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