BP Assessing Damage to Thunder Horse Platform in Gulf of Mexico

abarrelfullabarrelfull wrote on 16 Dec 2013 10:07
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July 11, 2005

BP today confirmed that the Thunder Horse semi-submersible platform, located in Mississippi Canyon Block 778 in the deepwater Gulf of Mexico, 150 miles southeast of New Orleans, is listing following the passing of Hurricane Dennis. Early reports confirmed that the platform is listing an estimated 20 - 30 degrees. The Thunder Horse field is in development and has not yet begun production of hydrocarbons.

The situation was discovered at approximately 8:30 a.m. Monday morning by a vessel in the area. The cause is unknown. The Thunder Horse platform had been evacuated of all personnel on Friday in anticipation of the hurricane’s approach. At this time there has been no known release of any fuel or hazardous substances.

BP immediately activated its Incident Command structure, notified the appropriate regulatory agencies including the U.S. Minerals Management Service (MMS) and the U.S. Coast Guard, and conducted over flights to further assess the extent of the damage.

At this time BP is mobilizing a number of response vessels to the Thunder Horse location and working with the Coast Guard to create a response plan. The first priority will be to safely board the vessel for a further assessment of its stability and to begin investigating potential causes of the issue.

BP and the Coast Guard are collaborating to establish a Unified Command in Morgan City, Louisiana.

Thunder Horse Fact Sheet

  • Moored Semi-submersible PDQ (Modularized Production, Integrated Drilling and Quarters); ABS Classed and Certified “Floating Offshore Installation”; All Subsea Wells
  • Location: Mississippi Canyon 778/822, 150 miles SE of New Orleans
  • Operator: BP (75%)
  • Partner: ExxonMobil (25%)
  • Water Depth: 6050 ft (@ PDQ location)
  • Design Life: 25 years
  • Processing Capability
  • Annualized average throughput - Oil 250,000 BOPD
  • Annualized average throughput - Gas 200 MMSCFD
  • Produced Water Peak 140M BWPD
  • Water Injection 200 to 300M BWIPD
  • Topsides Description
  • Topsides layout 3 production / utilities modules
  • Topside modules lift weight 21,000 short tons
  • Main Power Generation Capability 90 MW
  • Derrick 2MM lbs Maximum; Auxiliary Hoisting Capability
  • Quarters 229 persons
  • Helideck sized for an S-61 w/S-61 parked
  • Hull Description
  • Lightship weight 75,000 metric tons
  • Dry Transport weight 59,500 metric tons
  • Hull Displacement 129,000 metric tons
  • Mooring 16 x 5 ¾” wire rope & chain with suction pile
  • Main Deck 112 x 136 m
  • Normal Draft 30 m
  • Column Dimensions 2 @ 22 x 26 m.; 2 @ 22 x 23 m by 36 m. height
  • Pontoon Height 11.5 m
  • Deck Freeboard 17.5 m
  • Discovery Announced 15-Jul-99
  • First Oil 2005

Thunder Horse Field

  • Discovered in 1999, the Thunder Horse Field development is designed to utilize the largest Production Drilling Quarters (PDQ) semi submersible platform in the world. It weighs more than 50,000 tons and will produce from some of the deepest wells in the Gulf. The facility is designed to process 250,000 b/d and 200 mmcf/d with first oil expected in 2005 Oil and gas is planned to be transported to existing shelf and onshore interconnections via the Mardi Gras Transportation System.
  • BP operates the development (75% interest), with co-venturer ExxonMobil owning the balance.
  • Thunder Horse consists of two adjacent fields ('north' and 'south') being developed together.
  • Reservoirs are Upper Miocene turbidite sandstones.
  • Field will be developed via semi-submersible Production / Drilling / Quarters facility, supported by a network of 25 wet-tree subsea wells.
  • Export is via separately funded and approved Mardi Gras export pipelines.
  • Project is in the execution phase currently, with the Hull having been built in Okpo, Korea, and the topsides modules built in Morgan City, Louisiana.
  • Pre-drilling program is underway.

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