Serrano/Oregano Subsea Development

• Serrano
• Oregano

Serrano

Serrano is located in Garden Banks Block 516 and 472 in the Gulf of Mexico about 220 miles southwest of New Orleans in approximately 3,400 feet of water. The GB 516 lease was acquired in OCS Sale 104 in 1985. The GB 472 lease was acquired in 1989 in OCS Lease Sale 123. The leases are 100% owned by Shell Offshore Inc. 
 
The discovery well was drilled on GB 516 in 1996 using the Ocean Worker. The discovery well was drilled on GB 472 in 1999 using the Transocean Marianas.
 
The target reserves are in the SE 40 and SE 55 sands at depths of approximately 12000' and 18000' subsea. The average net pay is approximately 80 feet and 110 feet, respectively and the reserves are gas and associated gas condensate.

Development

Shell developed Serrano utilizing a subsea system tied back six miles to the Auger TLP on Garden Banks Block 426 in 2,860 feet of water.
 
The subsea system will consist of 2 wells connected to a subsea-flowline sled that is tied back to Auger via a single 6" by 10" pipe-in-pipe insulated flowline.

Oregano

Oregano is located in Garden Banks Block 558 and 559 in the Gulf of Mexico about 225 miles southwest of New Orleans in approximately 3400 feet of water.

The GB 559 lease was acquired in OCS Sale 123 in 1989. The GB 558 lease was also acquired in 1989 in OCS Lease Sale 123 and both are 100% owned by Shell Offshore Inc.
 
The discovery well was drilled on GB 559 in 1999 using the Noble Paul Romano.  Target reserves comprise oil and associated gas, and are in the K sands at a depth of approximately 19,000 feet subsea. API gravity for the oil is 35-37 and sulfur content is approximately 1.08%. 
 
Production began in October 2001. Total gross ultimate recovery is estimated at about 50 million barrels of oil equivalent. 

Shell announced in August 2000 its plans to develop Oregano utilizing a subsea system tied back eight miles to the Auger TLP on Garden Banks Block 426 in 2,860 feet of water. The subsea system will consist of 2 wells connected to a subsea-flowline sled that is tied back to Auger via a single 6" by 10" pipe-in-pipe insulated flowline.