Abstract: B9~B8H are the corresponding well groups for injection and production in Bohai River facies A oilfield. There are poor reservoir bands about 100~300m away from the injection well B9, with poor connectivity between oil and water wells. The wellhead pressure of the injection well rises rapidly, resulting in long-term under injection. The water drive effect of the production well B8H is poor, making it a low yield and low efficiency well. Conventional measures such as acidification, microfracturing, and pressurized water injection have limited treatment radii, and fracturing also poses a risk of injection water breaking through along the fracture zone. Therefore, it is necessary to find new process measures that can meet the requirements of a sufficiently large treatment radius and micro modification of poor reservoir bands. The liquid flow cavitation technology achieves the goal of reservoir micro transformation by improving natural micro cracks, directing pore throat channels, and adding new micro cracks, and can meet the requirements of large processing radius. After the implementation of liquid flow cavitation in well B9, the production situation at both ends of the injection and production has improved, and the reservoir properties, connectivity, permeability, and water drive effect between injection and production wells have been significantly improved. The successful application of this technology has provided reliable process measures for solving the problems of poor reservoir bands, weak connectivity between injection and production wells, and poor water drive effects in Bohai Oilfield.
Abstract: B9~B8H are the corresponding well groups for injection and production in Bohai River facies A oilfield. There are poor reservoir bands about 100~300m away from the injection well B9, with poor connectivity between oil and water wells. The wellhead pressure of the injection well rises rapidly, resulting in long-term under injection. The water drive ...Show More
