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BP ready to make decision on Mad Dog-2 concept in US Gulf of Mexico

Technip still in the race for BP Mad Dog-2 concept

2B1st_Project_Smart_Explorer_Sales_Pursuit_ToolThe French engineering company Technip is still in the race for the concept to develop BP Mad Dog Phase 2 project offshore USA in the Gulf of Mexico.

As part of strategic alliance between BP and Technip on the single point anchor reservoir (SPAR) concept, AMEC and Technip had been awarded the front end engineering and design (FEED) contract for the Mad Dog Phase 2 project.

Unfortunately the costs calculations of these concept were bubbling from the budgeted $10 billion to $18 to $20 billion capital expenditure. 

As a result, BP and its partners, BHP Billiton (BHP) and Union Oil Company of California (Chevron), decided to stop this FEED work and to envisage alternative concepts.

BP_Mad-Dog-2_Field_MapMad Dog is one of the largest offshore fields in the Gulf of Mexico where it is estimated to hold 4 billion barrels of oil equivalent (boe).

For Mad Dog 2, BP and its partners share the working interests in such a way:

 – BP 60.5% is the operator

 – BHP 23.9%

 – Chevron 15.6% 

Located 225 kilometers (140 miles) south of the Louisiana Gulf Coast, Mad Dog 2 belongs to the Block 738 by 1,371 meters water depth in the Green Canyon.

Mad Dog 2 position in the Green Canyon escarpment is part of the reason of the first choice in favor of the SPAR concept.

Therefore Technip had to comply with this environment to come back with an alternative solution.

Technip proposes HVS Semisub plaform concept

Technip developed the heave and vortex-induction-motion semisubmersible (HVS) platform as a combination of its experience acquired from the fleet of offshore platforms delivered for tens of years in various designs such as SPAR, semisubmersible or tension leg, in the Gulf of Mexico.

Originally this HVS semisub concept has been designed precisely for the deep offshore conditions of the Gulf of Mexico where the floating units are more exposed to high hull motion.

BP_Mad-Dog-2_HVS-Semisubmersible-Technip_FieldIn this context the heave is speeding up the fatigue effect on the steel catenary risers (SCR) causing replacement operations or periodic adjustments to distribute the fatigue in different touchdown points of the SCR.

In addition the vortex induced motion as it impacts the conventional semisubmersible hulls had also to be considered.

From the tests performed at the Texas A&M University Offshore Technology Research Center with the HVS model, Technip is targeting to reduce the heave motion by 35% to 50% and the VIM impact by 50% in the specific conditions of the Gulf of Mexico.

Although the HVS concept might be recently developed, it packages existing solutions well proven from other floating units.

In that respect BP is evaluating tension leg platform (TLP) with the same capacity of 100,000 barrels per day (b/d) as Mad Dog 1.

The conventional semisubmersible platform remains also as an option.

BP is planning to select the new concept to develop Mad Dog 2 before the end of 2013 in order to award a new FEED in following.

Depending on the concept chosen by BP and its partners BHP and Chevron between Technip HVS semisub and conventional TLP or semisubmersible platforms, Mad Dod 2 FEED should take 6 to 12 months with first oil to be produced in 2019.

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