Abstract:The decrease in water injection capacity caused by reservoir pollution near the wellbore can be effectively solved through conventional measures such as acidification, microfracturing, and pressure boosting water injection. However, there is no effective solution for the decrease in water injection capacity caused by poor reservoir connectivity near the wellbore. For example, during the water injection process of Well B1 in Bohai S Oilfield, the injection pressure gradually increases and cannot meet the injection requirements for a long time. The corresponding production well has poor water injection efficiency and is in a low efficiency state. The reason is that there is a low permeability zone about 100m away from Well B1, which leads to poor reservoir connectivity between the injection well and the production well. Due to the limited processing radius of conventional measures, it is not possible to transform this low permeability zone. Therefore, it is necessary to find new process measures that can meet the requirements of having a sufficiently large treatment radius and conducting micro modifications to low permeability zones. According to the principle of liquid flow cavitation reservoir modification technology, this technology can meet this condition. After implementing liquid flow cavitation in Well B1, both the water absorption capacity of the injection well and the production situation of the corresponding production well have been significantly improved. The successful implementation of this technology has solved the problem of poor reservoir connectivity and poor water injection efficiency between injection and production wells in Bohai Oilfield, and pointed out the direction of measures for similar problems in other oil and water wells, which can effectively improve their water injection development effect.