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1. (WO2018222394) STRATEGIC FLEXIBLE SECTION FOR A ROTARY STEERABLE SYSTEM

Pub. No.:    WO/2018/222394    International Application No.:    PCT/US2018/033037
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 17 01:59:59 CEST 2018
IPC: E21B 7/06
E21B 23/12
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: HARDIN, John Ransford, Jr.
Title: STRATEGIC FLEXIBLE SECTION FOR A ROTARY STEERABLE SYSTEM
Abstract:
A Rotary Steerable System (RSS) includes a flexible collar coupled therein or thereto that permits the stiffness of the RSS to be controlled and permits a desired turning radius to be achieved without sacrificing stability characteristics of the RSS. The flexible collar may be positioned between a steering section and the controller of the RSS. The parameters affecting the geometry, position and stiffness characteristics of the flexible collar and the RSS may be selected strategically to match the requirements of the particular wellbore being drilled. By selecting these parameters strategically, improvements may be achieved related to tool length, bending stiffness, bending stress, torsional stiffness, shear stress due to torsion and increased dogleg severity tolerance.