Featured patents

Method for Detecting Formation Pore Pressure by Detecting Pumps-Off Gas Downhole
US 08794350 B2, Aug. 5, 2014, Indicating, testing or measuring a condition of the formation, Mark William Alberty / BP Corporation North America Inc. (Houston, US)
A method for sensing an amount of gas in drilling fluid in a wellbore…

Fluid Transfer Device Usable in Managed Pressure and Dual-Gradient Drilling
US 08783379 B2, July 22, 2014, Boring a Submerged Formation, Roger Sverre Stave
A fluid transfer device for use in wellbore drilling, comprising:…

Method for Determining the Wear of a Force-Loaded Linkage of an Earth-Working Device
US 08863859 B2, Oct. 21, 2014, With Bit Wear Signal Generating, Sebastian Fischer et al. / Tracto-Technik GmbH & Co. KG (Lennestadt, DE)
A method for determining wear of a force-loaded linkage of an earth-working…

Core Lifter
US 08770320 B2, July 8, 2014, Core bit closure relative upwardly movable by core, Hongyan Zhang et al. / Longyear TM, Inc. (South Jordan, US)
A core lifter for use in a drilling system, the core lifter having a central…

Drill Bit With Enhanced Hydraulics and Erosion-Shield Cutting Teeth
US 08733475 B2, May 27, 2014, Fluid conduit lining or element, Craig Ivie et al. / National Oilwell DHT, L.P. (Conroe, US)
A drill bit of gage diameter for drilling through earthen formations and forming…

Backfilled Polycrystalline Diamond Cutter With High Thermal Conductivity
US 08662209 B2, March 4, 2014, Having a specified thermal property, Michael R. Reese et al. / Varel International, Ind., L.P. (Carrollton, US)
A PDC cutter, comprising:…

Downhole Tool Engaging a Tubing String Between a Drill Bit and Tubular for Reaming a Wellbore
US 08607900 B1, Dec. 17, 2013, With helical-conveying portion, Lee Morgan Smith / LB Enterprises, LLC (Anchorage, US)
A downhole tool for engaging a first bottom hole assembly component and a second…

Electronically Activated Underreamer and Calliper Tool
US 08528668 B2, Sept. 10, 2013, Radially adjustable, Wajid Rasheed
An integrated expansion and calliper tool that permits simultaneous underreaming…

Drill Bit With Tiered Cutters
US 08511405 B2, Aug. 20, 2013, Having a noncircular or nonplanar cutting face, Ryan Clint Frazier
An earth-boring bit, comprising:…

Regenerative Drive Mechanism for Hydraulic Feed Cylinders in Hydrostatic or Hydraulic Circuits
US 08453762 B2, June 4, 2013, Processes, Neil Skoog et al. / Atlas Copco Drilling Solutions, Inc. (Garland, US)
A method for operating an earth-penetrating drill rig, comprising:…

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