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1. (WO2018106255) DIRECTIONAL DRILLING WITH AUTOMATIC UNCERTAINTY MITIGATION

Pub. No.:    WO/2018/106255    International Application No.:    PCT/US2016/065790
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Sat Dec 10 00:59:59 CET 2016
IPC: E21B 7/06
E21B 41/00
E21B 44/00
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: DYKSTRA, Jason D.
XUE, Yuzhen
Title: DIRECTIONAL DRILLING WITH AUTOMATIC UNCERTAINTY MITIGATION
Abstract:
A disclosed drilling system includes a drill string assembly having subsystem inputs that control ROP and other performance parameters; and a processing system that provides automated uncertainty mitigation of a model for controlling the subsystem inputs. The drilling string assembly may include a BHA subsystem and a drill string that connects the BHA to a drilling rig subsystem and a fluid circulation subsystem. The processing system operates by: obtaining a drilling system model having interaction states representing how each subsystem input impacts the subsystem; characterizing an uncertainty for each interaction state; evaluating an influence of each interaction state's uncertainty on the performance parameters; calculating a net benefit for mitigating said model uncertainties; automatically mitigating said one or more model uncertainties when the net benefit exceeds a threshold, thereby improving the model of the drilling system; and controlling the subsystem inputs based on the model.