Gregory L. Hern

ANNULAR PRESSURE ACTIVATED DOWNHOLE TOOL

ANNULAR PRESSURE ACTIVATED DOWNHOLE TOOL

Annular pressure activated downhole tool

Bypass valve

Hydraulically set open hole whipstock

One trip drill and casing scrape method and apparatus

Window mill hydraulic line connection

Hydraulically set open hole whipstock

Whipstock valve with nozzle bypass feature

Hydraulic Whipstock Anchor

Watermelon mill with replaceable cutting structure

Whipstock valve with nozzle bypass feature

Disintegrating plug for subterranean treatment use

Partly disintegrating plug for subterranean treatment use

Disintegrating plug for subterranean treatment use

One trip drill and casing scrape method and apparatus

Downhole debris removal tool and methods of using same

Anchor slip and seal locking mechanism

Shear member post shear segment retention apparatus

Downhole anchoring systems and methods of using same

DOWNHOLE DEBRIS REMOVAL TOOL AND METHODS OF USING SAME

Downhole debris removal tool capable of providing a hydraulic barrier and methods of using same

Tool with multisize segmented ring seat

Casing spears and related systems and methods

Tool with multi-size ball seat having segmented arcuate ball support member

Downhole multiple cycle tool

Wellbore debris cleanout assembly and method to remove debris from a debris catcher

Magnetic retrieval apparatus and method for retaining magnets on a downhole magnetic retrieval apparatus

Retaining and isolating mechanisms for magnets in a magnetic cleaning tool

Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus

Downhole magnetic retrieval devices with fixed magnetic arrays

Brush Assembly with Non-Rotating Stabilizer and Brushes

Wellbore cleaning devices

Ball catcher with retention capability

Wellbore Cleaning Devices

DOWNHOLE SEAL AND ANCHOR RELEASING SYSTEM AND METHOD