Method and apparatus for interfacing a plurality of control syst

Details Method and apparatus for interfacing a plurality of control syst Method and apparatus for interfacing a plurality of control syst

1978-02-16

1979-11-13

Purser, Ernest R.

Wells

Processes

Producing the well

166363, 166368, 137236S, E21B 33035

Patent

active

041740009

ABSTRACT:
A system for controlling a plurality of subsea wellhead operators provides a dual set of operator controls having an electrical control cable and a pair of hydraulic control lines from the wellhead to a control center at the surface of the water. A primary set of electro-hydraulic multiplexed controls and a back-up set of hydraulic controls are each mounted in a separate control module on a base near the Christmas tree. When the primary set of controls fails operation is changed to the back-up set of controls by a signal from the surface control center. Defective control modules can be changed without removal of the tree cap as the controls are all outside the Christmas tree. Also, a defective primary control module can be removed while the back-up control module continues to control the operators in the Christmas tree.

REFERENCES:
patent: 3865142 (1975-02-01), Begun et al.
patent: 3894560 (1975-07-01), Baugh
patent: 3921500 (1975-11-01), Silcox

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