Research into polymer injection timing for Bohai heavy oil reservoirs

• DOI: 10.1007/s12182-014-0012-7
• Publication Date: 2015-01-16T01:25:13Z
• Authors: Lei-Ting Shi; Shi-Jie Zhu; Jian Zhang; Song-Xia Wang; Xin-Sheng Xue; Wei Zhou; Zhong-Bin Ye
• Keywords: Water cut; Produced water

Polymer flooding has been proven to effectively improve oil recovery in the Bohai Oil Field. However, due high viscosity and significant formation heterogeneity, it is necessary further displacement effectiveness of polymer heavy reservoirs service life offshore platforms. In this paper, effects water/oil mobility ratio dimensionless productivity index on were studied utilizing relative permeability curves. The results showed that when water saturation was less than value, where equal 1, could control increase fractional flow, which meant upper limit suitable for should be value 1. Mean while, by injecting a certain volume create channels reservoir, would most effective improving sweep efficiency, lower flow corresponding $$ \Delta \,J_{\hbox{max} } . Considering platform capacity, best injection timing optimized. It tested with crude 123 70 mPa s, optimum obtained floods initiated at time 10 % 25 %, respectively. range also theoretically analyzed Field curves, provided methods effectiveness.