Reservoir studies show that a homogeneous 601-acre oil lease can be developed by 10 wells vertical wells. An alternative is to consider using only horizontal wells each of lateral length 1500 ft. It is assumed that the area drained by each horizontal well is in the form of an ellipse. 1 acre = 43,560 sq.ft. a) Calculate Drainage radius of each vertical well b) Estimate Effective drainage radius of each horizontal well c) Estimate the number of horizontal wells required to effectively drain the reservoir. Method II: An Ellipse in horizontal plane Area drained by 1 horizontal well = Elliptical area = 7.a.b where a = half major axis of ellipse, and b = half minor axis of ellipse