Abstract: In the light of high water-cut oilfield, technical study of the biopolymer plugging adjustment is made. Based on the biopolymer property, core flooding ability and biopolymer plug adjustment capacity are discussed. Following lab experiment of physical model oil displacement with enhancing recovery of 9% and incremental oil production of 647t by oil-well water block-off, the field tests of biopolymer plugging adjustment in two water producers are made, lowering water-cut of 7.7~64.5% in adjacent oil wells with more than one year effec-tiveness. Through test monitoring and performance analysis, that the main factors influencing the effect of biopolymer plugging adjustment are confirmed, being as a guide for in-depth research and large-scale application of this technique.

Key words: MEOR, biopolymer, plug adjustment, field test