LandOfFree - US Patents - Listing for Wells,Processes,Operating valve, closure, or changeable restrictor in a well

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

Packer set safety valve for controlling dual fluid flows

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

Perforating type lockout tool

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

Petroleum well having downhole sensors, communication and power

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

Phase-controlled well flow control and associated methods

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

Plunger arrival target time adjustment method using both A and B

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

Positioning and conveying well apparatus and method

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

Pressure balanced piston for subsurface safety valves

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

Pressure change signals for remote control of downhole tools

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

Pressure change signals for remote control of downhole tools

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

Pressure controlled reversing valve

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

Pressure operated circulating valve with releasable safety and m

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

Pressure operated circulation valve

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

Pressure relief actuated valves

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

Pressure responsive well tool with intermediate stage pressure p

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

Pressure-actuated circulation valve

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

Pressure-balanced rod piston control system for a subsurface...

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

Process and device for hydraulically and selectively controlling

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

Providing a rechargeable hydraulic accumulator in a wellbore

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

Pulse width modulated downhole flow control