Inventor

HEARN DAVID D

US29 patents

⚠️ This page may combine multiple inventors who share the name “HEARN DAVID D”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HEARN DAVID D

ATLANTIC RICHFIELD CO

Wellbore cleanout apparatus and method

Method and system for increasing oil production from an oil well producing a mixture of oil and gas

Permanent whipstock and placement method

Well conduit cutting and milling apparatus and method

Method for increasing oil production from an oil well producing a mixture of oil and gas

Drilling of laterals from a wellbore

Downhole setting tool

Method and toolstring for operating a downhole motor

Apparatus for milling a window in well tubular

Coupling for releasing tubing strings from downhole tools

Means for reducing bending stresses in drill pipe

Drainhole drilling assembly with oriented elliptic drill collar

Mill starting device and method

Downhole tool for determining in-situ formation stress orientation

Drainhold drilling

Medium curvature directional drilling method

Tubing end locating apparatus for wellbores

Method and apparatus for cutting patterns through pipe

CONOCOPHILLIPS CO

Nano-thermite well plug

Through tubing P and A with bismuth alloys

Tool for metal plugging or sealing of casing

Tool for metal plugging or sealing of casing

Nano-thermite well plug

Nano-thermite well plug

Tool for metal plugging or sealing of casing

Through tubing P AND A with bismuth alloys

HEARN DAVID D

Directional sidetrack well drilling system

Mill-through tailpipe liner exit and method of use thereof

Permanent bypass whipstock assembly for drilling and completing a sidetrack well and preserving access to the original wellbore