With the rapid development of coiled tubing drilling technique the downhole motor gets smaller and smaller which is applied in well drilling and repairing. Small size downhole motors used in coiled tubing are paid more and more attention on well repairing, micro bore hole drilling, side drilling and re-drilling of old well. Because the coiled tubing can not rotate in drilling small size downhole motor is one of the best choice of downhole drilling tool in coiled tubing drilling and well repairing which has been applied in such as well flushing, sand cutting and so on.
Besides the coiled tubing operation the small size downhole motor is also applied in radial drilling operation.
