OFFSHORE STRUCTURES DESIGN OF THREE-LEGGED FIXED JACKET PLATFORM IN MAHAKAM BLOCK, EAST KALIMANTAN
The decline rate of domestic oil and gas production in the last ten years occurs as a result of the production inefficiency in the existing field. Necessary effort should be held responsible by the government and oil and gas practitioner to overcome this problem – considering that oil and gas con...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/80230 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The decline rate of domestic oil and gas production in the last ten years occurs as
a result of the production inefficiency in the existing field. Necessary effort should
be held responsible by the government and oil and gas practitioner to overcome
this problem – considering that oil and gas contribution to our energy main
resources is as yet significant, at least until 2050. Increasing the number of
production facilities to the existing field should come as a solution in addressing
the problem. In this final project, offshore structures design of a fixed-jacket type
production platform is carried out as a supporting production structure in
Mahakam Block, East Kalimantan. Feasibility study of this structure is evaluated
through in-place structural analysis, seismic analysis, and fatigue analysis,
referring to API RP 2A-WSD, 21st edition.
The design criteria examined in the in-place analysis and seismic analysis include
the stress ratio of structural member, joint punching shear, pile axial capacity, and
deflection. In the fatigue analysis, the fatigue life of the structure will be examined
based on the service life requirements used in this final project (40 years). Based
on in-place analysis’ results, the structure satisfies the applicable criteria with
horizontal bracing being the component with the largest member stress ratio
(UC=0.78). The structure also satisfies the criteria applicable to seismic analysis,
with the largest member stress ratio is taken place by the secondary framing
component on the main deck (UC=0.45). Results of the fatigue analysis show that
the fatigue life of the joint components satisfy the service life criteria, with the
minimum fatigue life occurs in the X-bracing connection (1108 years). Some
adjustments have been made by modifying the jacket tubular profile, with the
fatigue life result of the same connection turns out to have a lower value (107 years)
compared to the initial condition. |
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