BP started development of Andrew field in 1996 with a program for 13 producer wells and one gas injection well. Oriented perforating was used for the weaker Andrew sandstone intervals in some wells, as a means of reducing the risk of sand production. However, the accuracy of oriented perforating was unknown at the time and sanding has recently occurred on some of the wells. Subsequent work with the latest sanding-prediction software showed that perforations oriented away from the vertical direction could have collapsed and provided a source of sand production. Perforations oriented much closer to the vertical direction would, however, be stable and would extend the sand-free field life considerably. This paper describes the results and the evolution to high-accuracy orienting systems on three new Andrew wells and two workover wells.