Hydraulic and earth engineering – Marine structure or fabrication thereof – With horizontally movable work deck
Patent
1981-05-26
1983-08-30
Leppink, James A.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With horizontally movable work deck
166367, E02B 1700, E02D 2100
Patent
active
044013981
ABSTRACT:
A support structure (20) for supporting the freestanding portion of a mudline suspension wellhead includes first and second support arms (56) attached to and extending from an offshore drilling platform (24). The structure is aligned below a cantilevered type drilling derrick (40). A gantry (60) is supported by and slidable relative to these arms. A cradle structure (66) is mounted for lateral movement on the gantry. Structure is provided for positioning the gantry along the longitudinal length of the arms and for positioning the cradle along the longitudinal length of the gantry. Movement of the cradle structure relative to the gantry and of the gantry relative to the support arms defines a zone between the support arms and between the drilling platform and the outermost point of travel of the gantry in which the cradle may be selectively positioned. The gantry and cradle are aligned relative to the wellhead, and structure (290, 320) associated with the cradle is provided for clamping the wellhead thereto.
REFERENCES:
patent: 3001594 (1961-09-01), Suderow
patent: 3107496 (1963-10-01), Suderow
patent: 3189093 (1965-06-01), De Vries
patent: 3328969 (1967-07-01), Murphy et al.
patent: 3835939 (1974-09-01), McEntire
patent: 4030310 (1977-06-01), Schirtzinger
patent: 4161376 (1979-07-01), Armstrong
patent: 4244663 (1981-01-01), Croghan
Hjorth Beverly E.
Leppink James A.
Western Services International, Inc.
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