Geotechnical hazards associated with leg penetration of jack-up rigs

Conference · Wed Feb 01 04:00:00 EST 1984 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5853064

Kee, R

In recent years there has been a large increase in offshore oil and gas exploration activities. A large proportion of the work is being performed with jack-up drilling rigs. Jack-up rigs basically are of 2 types, depending on their foundation: Mat-supported or Individual footings (spud cans). Mat supported rigs have a large foundation bearing area and therefore impose relatively low bearing pressures on the seabed resulting in limited penetration. Mats are usually A-shaped and are suitable for use when the seabed comprises very soft clay soils. However, mat supported rigs require that the seabed is fairly level and their stability is sensitive to factors such as subsoil variability, cyclic and eccentric load effects, lateral sliding resistance and seabed instability. Rigs supported on individual footings are more numerous and much more widely used in South East Asia and this paper presents aspects of geotechnical hazards that may be encountered when their legs penetrate into the seabed.

• Research Organization: Fugro Singapore Pte Ltd,
• OSTI ID: 5853064
• Report Number(s): CONF-8402115-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE 12405
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
DEPTH
DIMENSIONS
DRILLING RIGS
EXPLORATORY WELLS
INSTALLATION
MECHANICAL STRUCTURES
MECHANICS
MORPHOLOGY
OFFSHORE PLATFORMS
SEA BED
SOIL MECHANICS
SUPPORTS
WELLS