The Application of Signal Collection and Disposal Technology in Measuring the Front of Oil and Water with Polymer Flooding

Abstract

The signal identification technology is applied in tertiary recovery of oil field, which is based on that everything has own resistivity. The artificial physical models are established basis on the heterogeneity of Daqing oilfield main oil layers. The matrix of reservoir does not conduct electricity, but the water with salt in the reservoir can. So the electrodes are inserted in the physical model according to some regulars in the process of polymer flooding experiment. The change of resistivity can reflect the front movement of oil and water with different time, so the distribution with water and oil saturation, sweep efficiency can be obtained. The experiments are done with one dimension and three dimensions heterogeneous physical model interlayer or intraformational layer respectively. The polymer solutions are compound with 1500mg/L KCl high salinity water. The experimental results show that the front of polymer solutions can be recognized with this method. The sweep efficiency is 0.92 and 0.67 in the medium and low permeability interlayers model with 570mg/L•PV polymer solutions, the sweep efficiency of medium and low permeability intraformational heterogeneity model is 0.83 and 0.34 simultaneity, the time when the polymer has effect is later than interlayer model, the total recovery is also lower than interlayer model 2.63%. This paper will help study the macro movement laws of oil and water, micro percolation mechanics and residual oil distribution with experiment technology. This study further extends the technology application between cross subjects.