E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/46.2
E21B 17/02 (2006.01) E21B 23/06 (2006.01) E21B 33/043 (2006.01) E21B 43/10 (2006.01) E21B 43/14 (2006.01)
Patent
CA 1067399
WELL FLOW CONTROL SYSTEM AND METHOD Abstract of the Disclosure A well system for petroleum oil and gas production having special application to extreme environmental settings such as platform, sub sea, and floating vessel operations, and wells in frozen regions such as the Arctic, and the like. The system is characterized by structure effectively defining a downhole well- head including weight supporting apparatus in which the tubing hanger is supported and a pack-off with the casing for minimizing the effects of structural damage at the surface end of the well system. The system includes a tubing hanger releasably lockable in a casing at a downhole location and having sealing means for sealing the annulus within the casing around the hanger, a ball valve package lock releasably lockable in the tubing hanger, a plurality of tubing strings connected with the ball valve package lock and extending upwardly therefrom, including tubing valves, a safety joint connected with the tubing strings above the valves, tubing strings connected with the safety joint extending upwardly therefrom to a tubing head supportable at the wellhead, control fluid conduits connected from the tubing head through the safety joint to the ball valve package lock and tubing hanger for manipu- lation of the system during various phases of operation, and a composite handling string for running and pulling the well system including either of a slip joint or a hydraulic stop and orienting tool. The system has spacing-out capabilities adapting it to floating vessel operation, eliminates critical measurement prob- lems, and is adaptable to remote operation. The safety joint per- mits emergency parting of the tubing string system above the down- hole wellhead defined by the tubing valves and packed-off tubing hanger leaving a known profile for subsequent recovery of the down- hole system with appropriate handling tools. The structure of the various components of the well tubing system and the composite handling string facilitates remote efficeint spacing-out and orientation within a well bore. The system permits a downhole wellhead to be functionally created below the mudline of offshore wells, Arctic wells, and the like.
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