Author: Toni Miszewski
When drilling a directional well, predicting the exact position of a target reservoir from surface is difficult. Logs from offset wells provide reference points but little indication of the formation away from the wellbore. Seismic measurements lack the resolution to fully complete the picture if the target zone is very thin. This is where geosteering is required. Traditionally, geosteering is performed by analysing the cuttings returning from the bit, or, with LWD logging tools positioned back from the bit. Both of these methods involve a delay between the time that the bit drills a formation and the time that the formation is identified. Depending on the depth of the well and the ROP, this delay could be over an hour.
Unlike conventional drilling with jointed pipe, coiled tubing drilling communicates at . . .
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