US 201213604719 A description fig1 is a cross section of an example wellbore 10 drilled through subsurface formations by a drilling rig 12 or similar device well known in the art disposed at the earth 39 s surface 11 although the example rig 12 shown is used on the land surface the disclosed examples are equally applicable to marine drilling the wellbore 10 may be initially drilled vertically or near vertically and when approaching a target formation 14 directional drilling equipment not shown may be used to change the trajectory of the wellbore at 10 a so that it ultimately follows the trajectory at 10 b of the target formation 14 the target formation 14 may be hydraulically fractured 20 portions of the wellbore at 10 b may be hydraulically isolated from each other using plugs 30 or similar mechanical seal devices to enable subsequent selective treatment e g hydraulic fracturing of individual portions of the wellbore at 10 b after each such selective treatment it may be required to clean out the excess fracturing proppant e g sand and to remove one or more of the plugs 30 referring to fig2 one example of such removal and cleaning operation may use a conduit contained on a coiled tubing unit 32 of types well known in the art to insert and withdraw a coiled tubing 32 from the wellbore 10 b a distal end of the coiled tubing 34 may include an orienting device 36 sensors 38 of various types known in the art an hydraulic motor 40 such as a positive displacement motor or a.