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Llano

Name

Llano

Operator

Shell

Location

Gulf of Mexico

Blocks

Garden Banks blocks 385 and 386

Distance from land

200 miles southwest of New Orleans

Water depth

2,600ft

Operator

Shell (27.5%)

Equity

Amerada Hess (50%), ExxonMobil (22.5%)

Lithology

Turbidite sands

Depths

24,000ft subsea (Pliocene layer), 26,000ft subsea (Miocene)

Net thickness

150ft in Pliocene, 95ft in Miocene

API gravity

28°

Sulfur

1%

Total recovery

40 million barrels of oil equivalent

Discovery

1998

Well depth

27,800ft

Rigs

Transocean Voyager and Omega

Discovery well

10,500 barrels of oil, 26 million ft³ of gas per day

Well development

Tieback to Auger Tension Leg Platform (TLP)

Tieback distance

11.5 miles

Wells

2

Pipeline network

2 x pipe-in-pipe (PIP) flowlines, 1 x infield PIP flowline

Inner pipe

8.625in diameter, 1.158in wall thickness

Steel

API 5L X70 SMLS

Outer pipe

12.75in diameter, 0.5in thickness

Steel

API 5L X52 HFIW casing pipe

Insulation

1.3in thick jacketed polyurethane foam

Flowline

3 x PIP flowline initiation sleds, 1 x infield PIP flowline termination sled

Water

2,500ft to 2,620ft of water

Risers

2 x 6.625in diameter, 1.067in thick

Steel

API 5L X70 SMLS

Water

2,860ft of water

Insulation

3.5in of Glass Syntactic Polyurethane (GSPU) insulation

Vessels

Derrick Barge No. 50 (DB50)

Main contractor

J Ray McDermott (detailed engineering, subsea, pipeline and marine installation)

Other contractors

FMC, V&M, Simrad, Sea Cat, Tenaris, Bayou Pipe Coating (joint fabrication), Shaw Pipeline Services (inspection), Fugro Chance (surface and acoustic positioning), Oceaneering (ROV services), Porter Services (PL sleds)

Capacity

25,000 barrels of oil, 75 million ft³ of gas per day

Development costs

$215 million

Peak production

32,000 barrels of oil per day
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