A Method for Optimizing Unstable Water Injection Parameters

In the ultra-low permeability reservoir, with the extension of water injection time, the reservoir characteristics are also changing, and it is difficult to determine the reasonable unstable water injection parameters. For the optimization of unstable water injection parameters, three methods are indoor core experiment analysis, numerical simulation and mine experiment, among which core experiment analysis and numerical simulation cost more and require more accurate basic data; mine experiment requires rich experience to achieve good results. In this study, the main factors affecting the effect of unstable water injection in the study area and the weight of the influence of each influencing factor were analyzed to calculate the reasonable injection amount and water injection fluctuation range, and applied them to the actual typical well group to achieve good results. Through this study, it can provide a set of practical and easy to operate methods for the optimization of water injection parameters in long-term unstable water injection development fields.