LandOfFree - US Patents - Listing for Wells,Valves, closures or changeable restrictors

Wells – Valves – closures or changeable restrictors

Cable system for use in a pipe string and method for installing

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Casing shoes and methods of reverse-circulation cementing of...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Casing shoes and methods of reverse-circulation cementing of...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Casing shut-in valve system

Wells – Valves – closures or changeable restrictors – Fluid operated

Casing structures having core members under radial compressive f

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Casing valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Casing valves system for selective well stimulation and control

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Catcher sub

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Cement control ring

Wells – Valves – closures or changeable restrictors – Destructible element

Cementing staging tool

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Cementing tool with protective sleeve

Wells – Valves – closures or changeable restrictors – Destructible element

Check valve assembly

Wells – Valves – closures or changeable restrictors – Destructible element

Check valve for fluid-producing wells

Wells – Valves – closures or changeable restrictors – Fluid operated

Chemical injection valve with openable bypass

Wells – Valves – closures or changeable restrictors – Fluid operated

Choke for enhanced gas and oil well production

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator

Choke valve assembly for downhole flow control

Wells – Valves – closures or changeable restrictors – Destructible element

Circulating and pressure equalizing sub

Wells – Valves – closures or changeable restrictors – Destructible element

Circulating kill valve

Wells – Valves – closures or changeable restrictors – Destructible element

Circulating valve