Prediction of leakage pressure in fractured formation based on integration of geology and engineering
To address the serious lack of geological and engineering data of fractured formation in the new exploration area which reduces the effectiveness of the existing calculation model of leakage pressure,this paper provided a geology-engineering integrated prediction method for leakage pressure in fractured formation.Based on the existing calculation model of leakage pressure,this method introduced the fracture indexes,combined with the mud leakage mechanism,formulated the classified evaluation indexes of leakage types,and formed a three-dimensional modeling method for leakage pressure in fractured formation.Moreover,the classified evaluation indexes of leakage type of Bohai Sea oilfield A were established,and three-dimensional leakage pressure modeling and predication of oilfield A was carried out,which was successfully applied to Well C-5,and the drilling cycle was shortened by 15 days.The application results showed that the fracture index of oilfield A was directly related to the location of the leak point.The method in this paper comprehensively utilizes geological,engineering and geomechanical data,which can provide reliable fine prediction results of leakage pressure for new exploration areas,and is conducive to optimizing the drilling design and management in new exploration areas.
new exploration areasfractured formationsfracture indexesthree-dimensional modeling methodgeomechanics