Abstract
The HBU fault block is a sandstone reservoir with the temperature as high as 118 °C, multiple longitudinal layers, severe heterogeneity, and the development of interflowing channels. After years of development, the reservoir has a high recovery rate (33.6%) and a high comprehensive water cut (93.6%). In order to improve the effect of water flooding development block, on the basis of geological research, we developed a new type of high temperature resistant movable gel displacement system, optimizing injection technology at the same time. In July 2018, deep adjustments and flooding were carried out on five oil well groups, and by May 2020, 16 Wells had increased oil by 13,000t. It was predicted that the production decline would reverse to -2.1%, which was a technical and economic success.
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