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Title: Subsea valve actuator for ultra deepwater

This paper reviews the continuing development of gate valve and actuator technology for subsea completions extending into ultra deep water. The basic technical challenges inherent to subsea valve actuators are reviewed, along with the various factors which affect the design and performance of these devices in deepwater applications. The high external ambient pressures which occur in deep water, coupled with high specific gravity hydraulic control fluids, are shown to have a significant impact on the performance of the actuators. This paper presents design and analysis methods and the verification test procedures which are required to develop and qualify new deep water actuator designs. Gate valve actuators of the type described in this paper are currently in use on subsea christmas trees on the world`s deepest subsea wells offshore Brazil (water depths >3,000 feet). New applications of the deepwater actuators are in process for upcoming Gulf of Mexico subsea production systems in water depths approaching 6,000 feet. The actuator/valve development method described in this paper has been confirmed by performance verification testing of full scale valves and actuators using a hyperbaric chamber to simulate ultra deepwater operating conditions. Performance of the test valves and actuators correlated very well with analytical predictions.more » Test results have confirmed that the new valve actuator designs will satisfy API 17D performance requirements for water depths up to 7,500 feet, well in excess of the upcoming GOM application.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
434052
Report Number(s):
CONF-960525--
TRN: IM9709%%486
Resource Type:
Conference
Resource Relation:
Conference: 28. offshore technology conference, Houston, TX (United States), 6-9 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of 28. annual offshore technology conference: Proceedings. Volume 4: Field drilling and development systems; PB: 942 p.
Publisher:
Offshore Technology Conference, Richardson, TX (United States)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; FIELD PRODUCTION EQUIPMENT; VALVES; ACTUATORS; OFFSHORE SITES; DESIGN; PERFORMANCE; OIL WELLS