LandOfFree - US Patents - Listing for Wells

Wells – Grapple and well anchored lifting means

Dual-action retrieving tool for oil well swabs

Wells – Submerged well – Means removably connected to permanent well structure

Dual-BOP and common riser system

Wells – Expansible anchor or casing – Spring set

Dual-bore, antirotating pump assembly

Wells – Processes – Perforating – weakening – bending or separating pipe at an...

Dual-ended apparatus for cutting openings in lined conduits

Wells – Processes – Assembling well part

Dual-saddle ear support apparatus

Wells – Submerged well – Wellhead

Dual-type plug for wellhead

Wells – Guide for device or conduit

Duel completion bop centralizer

Wells – Means for guiding insertable element laterally of well axis

Dump and kill valve for a sidepocket mandrel

Wells – Packers or plugs – Controllable passage through packer

Dump valve

Wells – Valves – closures or changeable restrictors – Destructible element

Dump valve assembly for selective draining of liquid from an...

Wells – Processes – Operating valve – closure – or changeable restrictor in a well

Dynamic mudcap drilling and well control system

Wells – Processes – Entraining or incorporating treating material in flowing...

Dynamic polysulfide corrosion inhibitor method and system for oi

Wells – Processes – Vibrating the earth or material in or being placed in the...

Dynamic reduction of the moisture layer during the...

Wells – Processes – Cleaning or unloading well

Dynamic scale removal tool and method of removing scale...

Wells – Valves – closures or changeable restrictors – Fluid operated

Dynamic seal for well tools

Wells – Submerged well – Means removably connected to permanent well structure

Dynamically positioned, concentric riser, drilling method...