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Tubular Bells Deepwater Oil and Gas Field, Gulf of Mexico, United States of America

Key Data

Tubular Bells Deepwater Oil and Gas Field, Gulf of Mexico

Tubular Bells is a deepwater oil and gas field located in Mississippi Canyon Block 725 of the United States Gulf of Mexico (USGoM).

"The field lies in water depths of approximately 1,310 to 1,400m and is situated about 217km south-east of New Orleans, Louisiana."

The field lies in water depths of approximately 1,310 to 1,400m and is situated about 217km south-east of New Orleans, Louisiana.

Development drilling at the field is expected to start in 2012. Commencement of initial production, which is targeted for 2014, will depend on the receipt of necessary clearances from the government. The cost of developing Tubular Bells is estimated to be $2.3bn.

Hess Corporation, an integrated energy company located in New York City, is the operator of Tubular Bells. It currently has a 40% working interest in the project and once BP's share is transferred (approval pending), the company's ownership will increase to 57.14%.

Chevron USA, co-partner in the project, will hold the remaining 42.86% interest.

Discovery of the Tubular Bells field

The Tubular Bells discovery was made in October 2003. The egg-shaped, deep Miocene discovery, spans parts of 682, 683, 724, 725, 726 and 727 Blocks of Mississippi Canyon.

The discovery well, located in a water depth of about 1,310m, was drilled to a total depth of around 9,488m by Transocean's Deepwater Horizon semi-submersible offshore oil drilling rig. The exploratory well struck about 58m of net oil pay.

An appraisal well was drilled in 2006. It encountered hydrocarbons about eight kilometres from the first well.

In order to further determine the Tubular Bells discovery, Diamond Offshore's Ocean Confidence semi-submersible rig was chartered to drill two sidetrack wells. The first sidetrack was drilled during the first quarter of 2007. The second well was spudded in the last quarter of that year and was completed during the first quarter of 2008.

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Estimated recoverable resources and production rates

Tubular Bells oil and gas field is estimated to contain recoverable reserves of more than 120 million barrels of oil equivalent. Once operational, the field is expected to produce 40,000 - 45,000 barrels of oil equivalent each day during peak production.

Development plan at the deepwater oil and gas field

In October 2011, Hess announced its field development plan (FDP) for the Tubular Bells project located in the Mississippi Canyon area. The development scheme initially calls for setting up three subsea production wells and a couple of water injection wells.

"In order to further determine the Tubular Bells discovery, Diamond Offshore's Ocean Confidence semi-submersible rig was chartered to drill two sidetrack wells."

These will be produced from two drill centres tied back to Gulfstar, a spar-based floating production system (FPS) owned by Oklahoma-based Williams Partners.

The two drill centres will be connected by two production pipelines, which, in turn will be connected to the FPS. The twin pipelines will be attached to the platform's hull by employing a steel catenary riser (SCR) method.

The first drill centre will initially support two production wells and a water injection well. The second drill centre will be set up for one production well and one water injection well. Both the centres will be operated via an umbilical and controls distribution system.

The FPS will be the first facility of its kind to be manufactured entirely in the US. It will be based on wet-tree technology and will be deployed in Block 768 of Mississippi Canyon, in a water depth of about 1,310m.

The production platform is designed to process 60,000 barrels of oil a day and 200 million standard cubic feet of natural gas each day. The facility will supply seawater injection services as well.

Contracts awarded by Hess Corporation

In May 2009, AMEC, a multinational engineering and project management firm based in London, was commissioned to provide engineering services for the Mississippi Canyon Block 725 oil and gas field.

Related project

Cascade and Chinook Subsea Development, Gulf of Mexico, US

Cascade and Chinook are located in the Walker Ridge block, 300km (180 miles) south of the Louisiana coast.

In May 2011, Hess signed a letter of award with Williams Partners for the delivery of production handling services. Under the contract, which was finalised in October of that year, Williams is required to design, build and install its Gulfstar FPS. The platform's hull is being manufactured by Gulf Island Fabrication at Aransas Pass in Texas.

Alliance Engineering was subcontracted in January 2012 to provide detailed engineering and design of topsides portion of the FPSO. The three-level topsides will be installed with processing equipment, seawater injection equipment and pumping and compression machines.

The platform will also house an accommodation building with a helicopter deck. The deck will weigh approximately 7,000t upon completion.

InterMoor was commissioned in February 2012 to design and manufacture ten suction piles for the Tubular Bells FPS platform. Each suction pile measures about 29.5m in length and has a diameter of 4.8m.

Installation of subsea equipments will be undertaken by Technip. The company was awarded a lump sum contract in February 2012. The scope of work includes design, engineering, manufacturing and subsea installation of more than 45km of product pipelines, SCRs, pipeline end terminations (PLETs), piles and structures.

ClampOn was contracted in May 2012 to supply subsea acoustic sand vibration detectors and a pipeline inspection gauge (PIG) for the development of Tubular Bells discovery.

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