Weatherford Technology Holdings, LLC

Weatherford/lamb, Inc.

Mark A Mitchell

David Pavel

Lev Ring

Thomas Floyd Bailey

Ram Kumar Bansal

David Iblings

David J Brunnert

Ghazi J Hashem

Thomas M Redlinger

Guy Feasey

Melissa Frilot

John W Kochera

Guy F Feasey

A method for drilling a wellbore includes drilling the wellbore by advancing the tubular string longitudinally into the wellbore; stopping drilling by holding the tubular string longitudinally stationary; adding a tubular joint or stand of joints to the tubular string while injecting drilling fluid into a side port of the tubular string, rotating the tubular string, and holding the tubular string longitudinally stationary; and resuming drilling of the wellbore after adding the joint or stand.

Rotating continuous flow sub

A method of drilling a subsea wellbore includes drilling the wellbore by injecting drilling fluid through a tubular string extending into the wellbore from an offshore drilling unit (ODU) and rotating a drill bit disposed on a bottom of the tubular string. The method further includes, while drilling the wellbore: mixing lifting fluid with drilling returns at a flow rate proportionate to a flow rate of the drilling fluid, thereby forming a return mixture. The lifting fluid has a density substantially less than a density of the drilling fluid. The return mixture has a density substantially less than the drilling fluid density. The method further includes, while drilling the wellbore: measuring a flow rate of the returns or the return mixture; and comparing the measured flow rate to the drilling fluid flow rate to ensure control of a formation being drilled.

Dual gradient managed pressure drilling

The present invention embodies a drill pipe in which various damaged sections of the pipe are repaired in order to maintain or improve the wear and buckle resistance of the drill pipe. The sections are strengthened using various hardening methods such as heat treatment processes and/or expansion techniques. A sleeve can also be applied to the strengthened portions. Surface enhancers, such as hardbanding, can be applied to the strengthened portions or the sleeve in order to provide abrasion resistance or to reduce friction.

Repaired wear and buckle resistant drill pipe and related methods

Growing community of inventors

Pearland, TX, United States of America

Mark A Mitchell