STRATEGIC FLEXIBLE SECTION FOR ROTARY CONTROLLED SYSTEM Russian patent published in 2020 - IPC E21B7/06 E21B7/08 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to controlled directional drilling. Method of configuring a rotary controlled system involves determining maximum intensity of curvature required for drilling a wellbore along a given wellbore trajectory, determining a combination of parameters for a flexible coupling to provide a rotor controlled system with sufficient flexibility to achieve said maximum intensity of curvature, wherein said parameters include outer diameter, inner diameter, length and modulus of elasticity, selection of material for flexible coupling on the basis of certain modulus of elasticity and assembly of rotary controlled system with flexible coupling considering combination of parameters and selected material.

EFFECT: required radii of drilling direction control are provided.

12 cl, 10 dwg