Techniques for high-efficient development of offshore fluvial oilfields

The geological reservoir conditions of fluvial oilfields offshore in Bohai are complex, with thin layer reservoirs, significant horizontal changes, poor connectivity, so these oilfields face the challenges of production well deployment, fine reservoir description, optimum resource allocation, and so on. To realize the efficient development of fluvial oilfields, this research has formed the technique of reservoir fine description and quantitative characterization in a sparse well network, the technique of regional sedimentation research and single river reservoir recognition, the well network optimization technique of single sand body, the rolling tapping potential technique in the fluvial oilfield. It is verified by 11 oilfields development of Bohai: the techniques are effective in the development of proved reserves resources, and 5 000×104 ton discovered reserves in the evaluation of rolling development are newly added. Thanks to the technology of reservoir fine description in forecasting reservoirs, the drilling rate is up to 98%; by the technique of fluvial single river reservoir recognition, the recovery ratio increases by 3% on average; the fluvial oilfield rolling development technique can bring a rapid transformation to the resources around the oilfield and achieve efficient development of oil and gas resources.