CPC E21B 21/085 (2020.05) [E21B 7/04 (2013.01); E21B 44/00 (2013.01); E21B 47/07 (2020.05); E21B 47/107 (2020.05); E21B 49/08 (2013.01); E21B 47/13 (2020.05); E21B 47/18 (2013.01)] | 21 Claims |
1. A method for geosteering in coiled tubing directional drilling, comprising:
measuring a response from a gas sensor disposed on a bottom hole assembly, wherein the sensor comprises an ultrasonic Doppler system;
determining a gas parameter from the response, wherein the gas parameter comprises a quantification of bubbles and a size of the bubbles;
determining a trend in the gas parameter, wherein the trend corresponds to a change in water content of fluids in a wellbore over time; and
determining adjustments to geosteering vectors for the bottom hole assembly based, at least in part, on, the trend, wherein the adjustments to the geosteering vectors are to bring a drill bit back into a productive zone.
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