Patent ID: 9027673
Filing Date: 2015-05-12
Classification: E21B

Abstract:
1. A method to rotary drill an extended section of a borehole with a rotary drill string that includes at least the step of inserting a mandrel possessing hydraulic means as a threaded component into said drill string comprised of discrete threaded drill pipes that are attached to a rotary drill bit used to drill said extended section of said borehole, whereby said mandrel possessing hydraulic means produces an additional force on said rotary drill bit, whereby said mandrel possessing hydraulic means is located within a segment of said wellbore having a casing, whereby said hydraulic means comprises a wear resistant elastomer material having a first portion bonded to said mandrel and a second portion that makes a sliding and rotating seal with an interior surface of said segment of casing, whereby said elastomer material is disposed within an annular region located between said mandrel and said interior of said segment of casing, whereby said elastomer material also possesses a fluid passageway within said elastomer material that allows clean drilling mud to flow within said annular region in a downhole direction towards said rotary drill bit, whereby said fluid passageway allows clean drilling mud to flow completely through the elastomer material from a first portion of the annular region uphole from said elastomer material to a second portion of the annular region downhole from the elastomer material, and whereby said additional force on said rotary drill bit is generated by clean drilling mud flowing through said fluid passageway within said elastomer material.