Study on Alternative Injection Schemes of Different Slug Combinations for Polymer Flooding in Block H
With the development of H block,the water cut of oil layer increases gradually and the annual oil production decreases year by year,but the remaining oil reserves of the block as a whole are considerable.Based on effective thickness,permeability and other factors,well groups in the test area are divided into four types,injected with different molecular weight,different mass concentration of polymer.In the case of polymer flooding with step-down concentration slug combination,the high mass concentration polymer blocks the high permeability layer,and the middle and low mass concentration polymer can better displace the remaining oil in the middle and low permeability layer,so as to improve sweep efficiency and enhance oil recovery.Therefore,three kinds of polymer flooding schemes with different combination of slugs were designed,and the suitable combination of slugs in the test area was optimized,and the polymer flooding effects of different schemes were predicted and compared.The results of numerical simulation showed that Scheme 3 was the most reasonable polymer flooding scheme,increasing oil accumulation by 5.91×104 t,enhancing oil recovery by 10.81%compared with conventional water flooding.
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