Case Stories of Horizontal Wells in Offshore Fluvial Oil Reservoir

Fluvial facies reservoirs account for 60% of the reserves in Bohai oilfield. The effective development of such reservoirs plays a very important role in long-term stable production of Bohai oilfield. There are many challenges including: poor reserve, large well spacing, large lateral changes, poor connectivity, heterogeneity, unfavorable viscosity, low structure amplitude and strong bottom water. Horizontal wells are widely used in these reservoirs, especially in the edge or bottom water reservoir and the narrow channel reservoir in Bonan area. Many cases of horizontal wells design, implementation, well pattern optimization and water flooding management were presented to improve the recovery rate of fluvial oil reservoirs. The technique has been widely used in ten fluvial oil fields in Bohai, and has enhanced the recovery rate of by 3% and achieved remarkable technical and economic effects.