申请人:Phillips Petroleum Company
公开号:US04498539A1
公开(公告)日:1985-02-12
A water permeability correction process, and composition therefor, to improve the sweep efficiency of waterflooding which involves the sequential injection of (1) an optional aqueous preflush slug to adjust connate water salinity, (2) an aqueous thickened slug comprising a sequestered polyvalent metal cation such as aluminum citrate, a gelable polymeric viscosifier such as polyacrylamide, and a hydrolyzable-pH-adjusting ester effective for delayed decreasing of the pH of the polymer slug which triggers in situ gelation to preferentially decrease water permeability in highly permeable thief zones, and, preferably, (3) an aqueous drive fluid.
一种水渗透性校正过程和其组成物,以提高水驱油的扫描效率,其中包括顺序注入以下内容:(1)可选的水预冲洗液柱以调整天然水的盐度,(2)含有螯合多价金属阳离子(例如柠檬酸铝)、可凝胶聚合物增稠剂(例如聚丙烯酰胺)和水解pH调节酯的水性增稠液柱,有效延迟降低聚合物液柱的pH,从而在现场凝胶化,以优先降低高渗透性盗窃区域的水渗透性,以及(3)水驱动液。