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Directional drilling
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=== Wellbore Surveys === Specialized tools determine the [[Borehole|wellbore's]] deviation from vertical (inclination) and its directional orientation (azimuth). This data is vital for trajectory adjustments. These surveys are taken at regular intervals (e.g., every 30β100 meters) to track the wellbore's progress in real time. In critical sections, [[measurement while drilling|measurement while drilling (MWD)]] tools provide continuous downhole measurements for immediate directional corrections as needed. MWD uses gyroscopes, magnetometers, and accelerometers to determine borehole inclination and azimuth while the drilling is being done.
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