Abstract:

The extra-low permeability block reservoirs can not be exploited efficiently because of its poor physical property and reservoir damage by water injection. The paper, taking Huayuan oilfield as the case, analyzes the reservoir characters and reservoir damages of extra-low permetyvoen ijection match experiment, scale formation prediction, the medicaments' choose and the acid pretreatment's study is made. These experimental evaluations provide the basic information to inhibit the reservoir damages and optimize the water injection. This study has been well applied in field test.

Key words: water injection production, extra-low permeability, water-injection match, reservoir damage