Acoustically actuated downhole blowout preventer

Acoustically controlled electro-mechanical circulation sub

Acoustically controlled subsurface safety valve system

Activating means for a down-hole tool

Actuating device

Actuator for well-head valve or other similar applications...

Adjustable spacer with rotational lock

Aligning inductive couplers in a well

Annular electrical contact apparatus for use in drill stem testi

Apparatus and method for actuating arms

Apparatus and method for manipulating an auxiliary tool within a

Apparatus and method for powering electrical devices along a...

Apparatus and methods for placing downhole tools in a wellbore

Apparatus and methods for powering downhole electrical devices

Apparatus and methods for testing earth formations

Apparatus and methods for utilizing a downhole deployment valve

Apparatus for decentralizing and orienting a well logging or per

Apparatus for deploying and energizing submergible electric moto

Apparatus for downhole drilling communications and method for ma

Apparatus for downhole injection and mixing of fluids into a cem