Through bore subsea christmas trees

Conference · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5442701

Huber, D S; Simmers, G F.C.; Johnson, C S

The workovers of subsea completed wells are expensive and time consuming as even the most routine tasks must be carried out by a semi-submersible. This paper describes the economic, safety and operational advantages which led to the development and successful first installation of 'through bore' subsea production trees. The conventional wet subsea trees have proved to be very reliable over the past ten years of operation in the Argyll, Duncan and Innes fields, however the completion strings require pulling on the average about once every three to five years. The conventional subsea tree/tubing hanger set up design requires the tree to be tripped and a rig BOP stack run to pull the tubing. This operation is time consuming, very weather sensitive and leaves the well temporarily without a well control stack on the wellhead. The 7 1/16'' 'through bore' subsea tree was developed to minimize the tubing pulling workover time and several trees have been run successfully since the latter part of 1984. The time saving on a tubing pulling workover is three days. In addition, the design considerably reduces the hazards and equipment damage risk inherent in the conventional design. Hamilton Brothers and National Supply Company in Aberdeen designed the equipment which must be considered a new generation of subsea production trees.

• OSTI ID: 5442701
• Report Number(s): CONF-850941-
• Resource Relation: Conference: European offshore conference, Aberdeen, UK, 10 Sep 1985
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
NATURAL GAS WELLS
WELL COMPLETION
WELL SERVICING
WELLHEADS
OIL WELLS
UNDERWATER OPERATIONS
DESIGN
INSTALLATION
BLOWOUT PREVENTERS
COST
DAMAGE
DRILL PIPES
DRILLING RIGS
HAZARDS
OFFSHORE OPERATIONS
OFFSHORE PLATFORMS
OPERATION
PRESSURE CONTROL
SAFETY
TIME DEPENDENCE
WEATHER
CONTROL
DRILLING EQUIPMENT
EQUIPMENT
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
423000 - Engineering- Marine Engineering- (1980-)