Dual diverter and orientation device for multilateral...

Dual downhole injection system utilizing coiled tubing

Dual dynamic rotary seal

Dual firing system for a perforating gun

Dual flapper barrier valve

Dual function cement additive

Dual functioning seal for rock bits

Dual horizontal rack

Dual inlet and lifting system using progressing cavity pumps

Dual isolation mechanism of cementation port

Dual latching landing nipple for downhole assemblies

Dual mechanical and resin anchor bolt

Dual packer for a horizontal well

Dual piston single phase sampling mechanism and procedure

Dual pump gravity separation system

Dual purpose blow out preventer

Dual redundant detonating system for oil well perforators

Dual retrievable standing valve cage

Dual safety valve installation

Dual safety valve method and apparatus