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US 4,474,236 AGranted
Method and apparatus for remote installations of dual tubing strings in a subsea well
AssigneeCameron Iron Works, Inc.
InventorRodney Kellett
Life of this patent
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AssigneeCameron Iron Works, Inc.
InventorRodney Kellett
Estimating the term…
An improved method of completing a well having production and service strings of different sizes including the steps of running the production string on a main tubing hanger while controlling the well with a variable bore blowout preventer and running the service string into the tubing hanger while controlling the well with a dual bore blowout preventer. An improved apparatus for completing a well having producing and service strings of different sizes including a main tubing hanger running tool having a removable connection on its lower end to connect to the main tubing hanger, a main bore, an upward tubular extension aligned with the main bore and of sufficient length to extend through the dual bore blowout preventer when the main tubing hanger is seated in the pressure ducts for testing and control of the main and service line tubing hangers, a service line bore offset from the main bore, hose connections at the top of the tubular extension, and parts to register with parts on the service line tubing hanger.
A method for completing a well having production and service strings of different sizes including the steps of running the production string on a main tubing hanger and maintaining control with a variable bore blowout preventer and then running the service string into the main tubing hanger and maintaining control with a dual bore blowout preventer with the two strings oriented.
A method of completing a well by production and service strings of different sizes, comprising the steps of running the production string on a main tubing hanger with the aid of a main running and testing tool having an upward tubular extension which, when the hanger is seated, extends upwardly through a dual bore blowout preventer and contains all necessary hydraulic pressure ducts for testing and control, maintaining control by the variable bore preventer, testing the main tubing hanger seals, then running the service string on its own service line tubing hanger with the aid of a service line running and testing tool, the service line tubing hanger seating in the main tubing hanger with ports in the running tools and hangers aligned, maintaining control by the dual bore preventer, and testing the service line hanger seals pressure applied through said ducts in the main tubing hanger extension.
A method of completing a well having production and service strings of different sizes, supported on a main tubing hanger having offset main and service bores aligned with the respective strings, comprising the steps of
A main tubing hanger comprising
Dependencies are inferred from the claim text.