Analysis of Pressure Buildup Data Following a Short Flow Period

Methods of analyzing buildup data following a short flow period are presented, discussed, and illustrated. A new type curve for uniform-flux and infinite-conductivity vertically fractured wells is presented. By matching buildup data with this new type curve, it is possible to determine the dimensionless flowing time before shut-in. A method for converting buildup data to equivalent drawdown data is discussed. This method can be used to combine buildup and drawdown data to obtain a longer band of data for type-curve matching. This method can be used for constant-rate production, constant-pressure production, and for the case where both pressure and rate vary during production. 17 refs.