Abstract
In order to resolve the discharge problem of the polymer-flooding produced water (PFPW) in crude oil ex-traction, the PFPW was treated by a four-grade and four-segment (four GS) electrodialysis reversal(EDR) set-up. The testing results show that the treated PFPW has two kinds, one is the diluted treated PFPW, the total dissolved solids (TDS) of the diluted treated PFPW is less than the original PFPW, the diluted treated PFPW is feasible for confecting polymer solution; another one is the concentrated treated PFPW, the TDS of the concentrated treated PFPW exceeds the original PFPW, the concentrated treated PFPW is feasible for replacing the PFPW as the injecting water in the water-flooding process for high permeability layer. This treatment technology can not only decrease environment pollution resulted by the PFPW discharge, but also achieve closed-circuit of the water resource during crude oil extraction by using polymer flooding technology.
Highlights
Water can be injected into the stratum to drive the crude oil out of the ground, which is often termed as water flooding process or secondary oil extraction
Most of the published work on the removal of total dissolved solids (TDS) from oilfield produced water was addressed with the use of reverse osmosis, few scaled-up tests of electrodialysis has been performed for this application [6]
The treated polymer-flooding produced water (PFPW) has two kinds, one is the diluted treated PFPW whose TDS is less than the original PFPW, the diluted treated PFPW is feasible for confecting polymer solution; another one is the concentrated treated PFPW whose TDS exceeds the original PFPW, the concentrated treated PFPW is feasible for replacing the PFPW as the injecting water in the water-flooding process for high permeability layer
Summary
Water can be injected into the stratum to drive the crude oil out of the ground, which is often termed as water flooding process or secondary oil extraction. Industrial experiences show that polymer flooding can enhance oil recovery by up to 12% and plays a key role in the oil exploitation [1,2]. This technology has been widely used in Daqing oilfield in China in recent years [3,4,5]. Most of the published work on the removal of TDS from oilfield produced water was addressed with the use of reverse osmosis, few scaled-up tests of electrodialysis has been performed for this application [6]. The available uses of the diluted treated PFPW and the concentrated treated PFPW were analyzed
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