Experimental Study on Electrical Chemical Production Approach for Improvement of EOR at Different Stages of Oilfield Development

摘要

The electrical ― chemical production approach is a new method for enhancing oil production and recovery which is based on the process of electrical ― chemical and electrical ― dynamically reaction within the porous medium or a reservoir under the application of direct electrical field. In this paper , dynamic displacement experiments using reservoir cores , simulated oil mixed by crude oil and kerosene , salt water and surfactants were performed to investigate the effect of electrical field applied to the cores on the oil recovery at different time period and conditions of using and no ― using surfactants in the injected fluids. The experimental results showed that there is a relationship between the increment of oil recovery of the tested core and the tune stages of the electrical field applied to the core. Before the injected water did not breakthrough the production end of the core, the effect of the electrical action stages on the EOR was not obvious, and as the injected water breakthrough the production end of the core , the improved degree of oil recovery gradually decreased with the delay of the electrical action stage which means that the suitable time period of electrical field applied is at the stage that water breakthrough in the production wells. The investigations also showed that when the injected water contained a selected surfactant at designed concentration. The EOR would be increased. These experimental results would be useful for oil industry to apply the new method for improving the recovery of the oilfield.