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

Casing filling and circulating apparatus and method

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

Cemented open hole selective fracing system

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

Circulating valve apparatus and drill stem test method allowing

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

Circulating valve responsive to fluid flow rate therethrough and

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

Circulation control valve and associated method

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

Circulation control valve and associated method

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

Circulation valve

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

Combination ball valve and annular pipe seal

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

Combination well casing pressure relief and kill valve apparatus

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

Communicating commands to a well tool

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

Communication tool for accessing a non annular hydraulic...

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

Communication tool for accessing a non annular hydraulic...

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

Communication with a downhole tool

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

Compressible liquid mechanism for downhole tool

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

Control apparatus and method responsive to a changing stimulus

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

Control system

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

Control system with collection chamber

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

Control system with failsafe feature in the event of tubing...

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

Controlled rate well cementing tool