 A relatively modern drilling technique involves using coiled tubing instead of conventional drill pipe.This has the advantage of requiring less effort to trip in and out of the well (the coil can simply be run in and pulled out while drill pipe must be assembled and dismantled joint by joint while tripping in and out).An additional advantage is that the coiled tubing enters the hole via a stripper, mounted on the injector, which provides a hydraulic seal around the coil.