Apparatus for drilling offshore wells

Apparatus for drilling straight holes in rock in restricted...

Apparatus for drilling straight portion of a deviated hole

Apparatus for driving an upwardly directed shaft in rock

Apparatus for dropping articles downhole

Apparatus for early evaluation formation testing

Apparatus for earth coring

Apparatus for electromagnetically coupling power and data...

Apparatus for eliminating net drill bit torque and...

Apparatus for enhanced oil recovery

Apparatus for enhanced recovery of viscous oil deposits

Apparatus for establishing branch wells from a parent well

Apparatus for extending and retracting the cutter bars of a...

Apparatus for extracting a liquid from a long tube

Apparatus for extracting crude oil from sand

Apparatus for extraction of hydrocarbon fuels or...

Apparatus for facilitating removal of a casing of an...

Apparatus for feeding a drilling machine in extension rod...

Apparatus for firing borehole perforating apparatus

Apparatus for flexibly restraining service loops in an oil...