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1. (WO2017199104) METHOD FOR IMPROVING DRILLING DIRECTION ACCURACY AND KNOWLEDGE OF DRILLING DIRECTION

Pub. No.:    WO/2017/199104    International Application No.:    PCT/IB2017/050757
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Sat Feb 11 00:59:59 CET 2017
IPC: E21B 47/022
E21B 47/024
Applicants: AARBAKKE INNOVATION AS
Inventors: HANSEN, Henning
GUDMESTAD, Tarald
Title: METHOD FOR IMPROVING DRILLING DIRECTION ACCURACY AND KNOWLEDGE OF DRILLING DIRECTION
Abstract:
A method for determining spatial position of a drill bit during drilling of a subsurface wellbore includes measuring acoustic signals generated by operating the drill bit to drill subsurface formations using an acoustic sensor proximate the drill bit. Acoustic signals are measured at a plurality of known, spaced apart locations on a land surface above the wellbore or on the bottom of a body of water above the wellbore. Travel time of the acoustic signals from the drill bit to each known, spaced apart location is determined using the measured drill bit signals and the measured signals at the plurality of locations. The spatial position of the drill bit is determined using the determined travel times.