Unique equipment used to build Cognac line

Journal Article · Mon May 12 00:00:00 EDT 1980 · Oil Gas J.; (United States)

OSTI ID:6216857

Langner, C G; Wilkinson, H M

According to C.G. Langner and H.M. Wilkinson of Shell Oil Co. at the Offshore Technology Conference (Houston 1980), the 12 inch Cognac pipeline from Mississippi Canyon Block 194 in the Gulf of Mexico to Shell's production facilities on the Mississippi River Delta reaches a water depth of 1,020 feet, the deepest operating oil pipeline in the world; began operation 9/19/79; moves two-phase gas/oil production from the Cognac platform to shore at a gas-oil ratio of about 700-800 std cu ft/bbl at 3,000-30,000 bbl/day throughout; and is probably the largest diameter and deepest J-tube riser installed to date. Devices used during installation included a subsea insulating coupling and 120 zinc anode bracelets for cathodic protection; unmanned submersibles for installing messenger wire through the J-tube; a 400,000 pound tension cable pulling machine, with 2.5 inch wire cable and special pipeline pull head, which pulled the riser through the J-tube conduit; and an electronic navigation system for the lay barge. In 1981, a second line, probably a 16 inch gas line, will be laid, and the present line will carry single-phase oil at 50,000 bbl/day max throughput. The construction of the Cognac line is discussed.

• Research Organization: Shell Oil Co.
• OSTI ID: 6216857
• Journal Information: Oil Gas J.; (United States), Vol. 78:19
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
NATURAL GAS
TRANSPORT
PETROLEUM
PETROLEUM INDUSTRY
MEETINGS
OFFSHORE OPERATIONS
PIPELINES
CONSTRUCTION
ANODES
BARGES
CABLES
CATHODIC PROTECTION
COUPLINGS
DEPTH
GULF OF MEXICO
INSTALLATION
MACHINERY
MARINE RISERS
MISSISSIPPI RIVER
NAVIGATIONAL INSTRUMENTS
OFFSHORE PLATFORMS
SUBMARINES
UNDERWATER OPERATIONS
WIRES
ZINC
ATLANTIC OCEAN
CARIBBEAN SEA
CORROSION PROTECTION
DIMENSIONS
DOCUMENT TYPES
ELECTRODES
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
INDUSTRY
METALS
PIPES
RIVERS
SEAS
SHIPS
STREAMS
SURFACE WATERS
022000* - Petroleum- Transport
Handling
& Storage
032000 - Natural Gas- Transport
Handling
& Storage