Crossflooding techniques have the potential for increasing the ultimate oil yield in secondary or tertiary recovery operations. At least one field scale pilot study of crossflooding in a reservoir undergoing a steamflood is being undertaken at this time. The purpose of this investigation is to evaluate using a numerical simulation various crossflooding options on five and nine spot patterns under a continuous steam drive. As the simulation of a crossflooding process is demonstrated to be very sensitive to the grid orientation phenomenon, these studies are undertaken using a steam displacement model that does not exhibit a serious grid orientation effect. The numerical studies indicate that crossflooding significantly improves the ultimate oil yield in steamflooding operations. The simulation studies indicate that an increased yield is achieved without infill drilling by using an expanded pattern crossflood. Crossflood patterns involving infill wells perform only marginally better than the expanded pattern floods. A new crossflooding pattern introduced in an earlier theoretical investigation is shown to improve the ultimate net oil yield in steamflooding operations.