Hybrid wellhead system and method of use

Details Hybrid wellhead system and method of use Hybrid wellhead system and method of use

2011-03-15

2011-03-15

Dang, Hoang (Department: 3672)

Wells

Processes

Assembling well part

C166S075140, C166S085400, C166S089100

Reexamination Certificate

active

07905293

ABSTRACT:
A hybrid wellhead system is assembled using a plurality of threaded unions, such as spanner nuts or hammer unions, for securing respective tubular heads and a flanged connection for securing a flow control stack to a top of a tubing head spool. The tubing head spool is secured by a threaded union to an intermediate head spool. The intermediate head spool is secured by another threaded union to a wellhead. Each tubular head secures and suspends a tubular string in the well bore. The hybrid wellhead system is capable of withstanding higher fluid pressures than a conventional independent screwed wellhead, while providing a more economical alternative to a flanged, or ranged, wellhead system because it is less expensive to construct and faster to assemble.

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