Underwater Christmas tree

Details Underwater Christmas tree Underwater Christmas tree

1977-09-06

1978-12-19

Purser, Ernest R.

Wells

Submerged well

Testing

166156, 166363, 166368, E21B 712

Patent

active

041301617

ABSTRACT:
An underwater Christmas tree for controlling flow from an offshore well is disclosed as having a master valve which is controlled by fluid pressure within a flow-line extending from a production bore of the tree, and means for receiving and releasably retaining a TFL tool in the production bore intermediate the location at which control pressure is sensed and the intersection of the production bore with an auxiliary bore of the tree through which wireline tools are run. Since the TFL tool limits flow therepast, flowline pressure may be maintained at a level necessary to maintain the master valve open independently of fluid pressure within the auxiliary bore.

REFERENCES:
patent: 3308880 (1967-03-01), Yetman
patent: 3357491 (1967-12-01), Jones et al.
patent: 3361206 (1968-01-01), Raulins
patent: 3396789 (1968-08-01), Dean
patent: 3604456 (1971-09-01), Jones

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