Coupling water injection in channel sand reservoirs

Channel sandstone reservoirs in the Tahe oil field have strong plane heterogeneity. Sand bodies are thick and show favorable physical properties in channel center, and become worse to the sides. As a result, oil remains in wells in great quantities. Water injection for energy supply is necessary to enhance production even though small-scale edge water exists locally. Conventional continuous water injection is effective during the early stage; however, it is difficult to govern water breakthrough. Optimized injection way, injection-production ratio, water injection amount and cycle were put forward and proved effective after practicing in channel sand reservoirs in Triassic, T5 well block.