关键词: 聚驱, 上返, 封堵, 注水, 注聚

Abstract: The development of polymer flooding injection wells in X oilfield is based on the development method of up fill-up, which has many problems, such as the large amount of up-filled plugging works, and the subsequent contribution of water drive zones to production. Therefore, the study on the process of stratified injection technology for water & polymer in the same well is carried out. Through the design of the tube column in the upper layer of the injection well and the lower layer general water injection process, four key technologies involving large diameter washable well packer, polymer injection sliding sleeve switch, plugging sealing section and special connecting collar are studied. The water and the polymer are injected at the same time in the single well. The laboratory test and field test of the tool have obtained good experimental results. This technology provides technical support for the development of the up-fill stimulation on the polymer flooding blocks.

Key words: Polymer flooding, Up-fill, Plugging, Water injection, Polymer injection