Urano was drilled by the Jack Ryan drillship, in a water depth of 1,938m, some 345 kilometers northwest of Luanda and reached a total depth of 4,578 meters below sea level. This is the first discovery in Block 31 where the exploration well has been drilled through salt to access the oil bearing sandstone reservoir beneath.
The well was tested at an encouraging maximum flow rate of 1,970 barrels of oil a day (b/d) from a limited test interval through an 86/64 inch choke, confirming the capability of the entire sand interval to flow at a much higher rate.
Sonangol is the concessionaire of Block 31. BP Exploration (Angola) Limited as operator holds 26.67 percent. The other interest owners in Block 31 are Esso Exploration and Production Angola (Block 31) Limited (25 percent), Sonangol E.P. (20 percent), Statoil Angola A.S. (13.33 percent), Marathon International Petroleum Angola Block 31 Limited (10 percent) and TEPA (BLOCK 31), LIMITED, (a subsidiary of the Total Group) with 5 percent.
Operatorship of Block 31 was awarded to BP Exploration (Angola) Limited in May 1999. The block covers an area of 5,349 square kilometers and lies in water depths of between 1,500 and 2,500 meters.
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