METHOD FOR DEEP PROFILE MODIFICATION AND FLOODING OF LOW-PERMEABILITY RESERVOIR

摘要

A method for deep profile modification and flooding of a low-permeability reservoir, comprising: sequentially injecting a soft elastic particle pre-slug, a polymer microsphere main slug, and a soft elastic particle protection slug into an oil layer, the ratio of total injection volumes of the three slugs being 1-2:6-8:1-2. The method provides a solution for profile modification and flooding by combining styrene soft elastic particles and polyacrylamide polymer microspheres, wherein the soft elastic particles can fill oil layer cracks and large pores, and the polymer microspheres can displace remaining oil in the oil layer. The method adopts the combination of different profile modification and flooding system slugs to achieve the purpose of filling cracks and large pores, displacing crude oil, and increasing oil recovery.