Centralized Production Facilities
- S.D. Rench (Conoco Inc.) | K.A. Folse (Conoco Inc.) | C.M. Johnson (Conoco Inc.) | J.H-C. Chan (Conoco Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 1993
- Document Type
- Journal Paper
- 464 - 469
- 1993. Society of Petroleum Engineers
- 4.5 Offshore Facilities and Subsea Systems, 4.2 Pipelines, Flowlines and Risers, 4.5.2 Platform Design, 4.1.6 Compressors, Engines and Turbines, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.3.2 Multiphase Flow, 4.1.2 Separation and Treating, 4.1.5 Processing Equipment, 4.2.3 Materials and Corrosion, 4.6 Natural Gas
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This paper describes the development of the central production platform(CPP) in Green Canyon Block 52. It describes production platform (CPP) in GreenCanyon Block 52. It describes some of the unique features of the platform, itsschedule, and key management decisions that affected platform design,construction, and installation.
The CPP is a major component of the Jolliet and Marquette projects, whichdevelop oil and gas reserves in the Green Canyon projects, which develop oiland gas reserves in the Green Canyon area of the Gulf of Mexico. Installed in616 ft of water, the CPP is connected by pipelines to the tension-leg wellplatform (TLWP) and it is connected by bridge to the Marquette platform. Spacehas been allocated on the CPP for future developments within the Green Canyonarea. As the name implies, oil, gas, and produced water are brought to the CPPfrom outlying platforms. There are no wells on the CPP. Oil and gas are treatedand conditioned to meet their respective pipeline specifications. Producedwater is treated (oil is removed to enable its disposal overboard) and may beused ultimately for reservoir pressure maintenance. Having these processingfacilities at a central location allows space, weight, processing facilities ata central location allows space, weight, and manpower to be minimized at theoutlying platforms. Fig. 1 is a geographic overview of the CPP. Conceptualengineering of the CPP occurred in Jan. through June 1987. Detailed engineeringtook 14 months (June 1987 through Aug. 1988). Jacket fabrication began in April1988, and deck/facilities construction started in July 1988. Onshorefabrication was complete for the jacket in April 1989 and for the deck in Aug.1989. Offshore hookup and commissioning were done from Sept. through Nov. 1989.Refs. 1 through 3 give additional information on the Jolliet project and theCPP.
The jacket is primarily a conventional design with a few unique features(see Table 1). It is installed at a depth of 616 ft, with a weight in air of8,260 tons. The jacket is a four-leg design with two skirt piles per corner andno main piles. Total pile penetration is 340 ft; total weight of all eightpiles is 2,250 penetration is 340 ft; total weight of all eight piles is 2,250short tons. The jacket was built with eight J-tubes for pipelines. Fourpipelines currently are pulled into the J-tubes, with four J-tubes pipelinescurrently are pulled into the J-tubes, with four J-tubes reserved for futurepipelines. Other jacket appurtenances include four personnel miniboat landings,four barge bumpers, eight pump caissons, and two skim piles. Perhaps the mostunusual jacket feature is the half-depth launch box. It is a cross-sectionallysquare steel tubular frame from a jacket elevation of - 132 ft down to a jacketelevation of -616 ft. The launch box was designed to bear the weight andstresses of the entire jacket during load out, transport, and launch. Thehalf-depth launch box and the main jacket frame are not rigidly connected,which allows them to react to thermal and other environmental stresses somewhatindependently,
The CPP deck is a three-level, eight-leg, plate girder design. The main andcellar decks are roughly 110 x 195 ft, and the subcellar deck is 90 x 200 ft.Total deck area is approximately 62,000 ft2 (1.4 acre). Deck elevations are 56,77, and 102 ft above mean sea level. Because of weight considerations andderrick barge lift capacities, the deck was designed to be built in any one ofthree potential configurations: a four-piece configuration with a potentialconfigurations: a four-piece configuration with a vertical split down themiddle of the deck and a horizontal split between subcellar and cellar decks, atwo-piece configuration with a vertical split only, or a one-piececonfiguration. In June 1988, fabrication and installation bids were evaluatedsimultaneously. This was a key management decision to reduce costs. The bid foroffshore deck installation was awarded very early to enable a more economicalfabrication/installation combination to be selected. In the end, a two-piecedeck configuration was selected. Therefore, in effect, two four-pile-type deckswere built. A second key decision was to require the fabricator to build thetwo deck halves (east half and west half) in correct spatial proximity to eachother.
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