US 12,000,223 B2
Geosteering in directional drilling
Alberto F. Marsala, Dhahran (SA); Eric Donzier, Versailles (FR); Emmanuel Tavernier, Versailles (FR); and Linda Abbassi, Versailles (FR)
Assigned to Openfield Technology, Versailles (FR); and Saudi Arabian Oil Company, Dhahran (SA)
Appl. No. 17/290,049
Filed by Saudi Arabian Oil Company, Dhahran (SA); and Openfield Technology, Versailles (FR)
PCT Filed May 26, 2020, PCT No. PCT/IB2020/000532
§ 371(c)(1), (2) Date Apr. 29, 2021,
PCT Pub. No. WO2021/240197, PCT Pub. Date Dec. 2, 2021.
Prior Publication US 2022/0307337 A1, Sep. 29, 2022
Int. Cl. E21B 21/08 (2006.01); E21B 7/04 (2006.01); E21B 44/00 (2006.01); E21B 47/07 (2012.01); E21B 47/107 (2012.01); E21B 47/13 (2012.01); E21B 47/18 (2012.01); E21B 49/08 (2006.01)
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
OG exemplary drawing
 
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.