Optimization and application of perforation scheme in light oil reservoirs of Bohai oilfield

In consideration of bottom water coning and bad development effectiveness because of inappropriate thickness of unperforated intervals of light oil reservoirs in Bohai oilfield with active edge and bottom water,by using numerical simulation method,the effects of the horizontal distance between the production well and inner oil boundary,the vertical distance between the bottom of oil layers and oil-water contact,oil layer thickness,oil viscosity,permeability contrast on the thickness of unperforated interval were analyzed.The results show the thickness of unperforated interval increased as the viscosity increased,and the unperforated interval was unnecessary when the distance between the production well and inner oil boundary was over 100 meters for light oil reservoirs in Bohai oilfield.The optimum thickness of unperforated interval was found to be 3 meters when the oil viscosity was less than 5 mPa·s.Perforation scheme template of light oil reservoirs in Bohai oilfield was established at the first time,which provided good guidance for rational development of similar oilfields.