Oil Lift Technology Inc.

National Oilwell Varco, L.p.

Denis Blaquiere

Ramamurthy Narasimhan

Kogan Lee

Ross Willard Senger

Manjunath Devalapalli Prakash Reddy

Santhosha Singanahalli Malleshappa

Manjunath Jayanthi Narayana Setty

Gerry L Lorimer

Embodiments of a wellhead assembly have a tubular body with a removable bottom cap to house a tubing rotator comprising a multi-enveloping worm gear assembly which provides sufficient torque to rotate tubing strings in deep and/or deviated wellbores. The bottom cap is supported on a wellhead having a dognut for supporting a production string therefrom in a wellbore. The bottom cap rotatably supports a mandrel and multi-enveloping worm wheel thereon, the mandrel being connected to the dognut and tubing string for co-rotation therewith. The tubular body supports a multi-enveloping worm for engagement with the worm wheel when the tubular body is lowered axially onto the bottom cap. When the tubular body and worm are lifted axially from the bottom cap, the worm wheel and mandrel are exposed for repair or replacement without need to pull the production string from the wellbore. The tubular housing can further house a flow tee and opposing blowout preventer ports and rams therein, forming an integrated wellhead assembly.

Wellhead assembly with integrated tubing rotator

Growing community of inventors

Calgary, Canada

Denis Blaquiere