What phasing patterns are available?
We use phased carriers for a number of reasons. Most commonly we use phased carriers as a method of increasing the shot density. That is the number of available shots in a given interval length of expendable carrier, ported carrier, ECO II or other style of perforating system. This value is seen as shots per meter (SPM) or shots per foot (SPF). Shot densities can range from 1 to 118 SPM depending on the system. Phase patterns likewise are diverse in nature. Patterns range from 1 shot every 10 deg. around the carrier to 1 shot every 0/360 deg.The latter is known as 0 (zero) degree phasing. Phasing may also be limited by the style of carrier used for perforating. In some applications such as through tubing perforating the carrier may be limited to zero degree or 180 degree phasing.
