Santos Limited (STO) announced that it has completed testing of the Dua-5X well, offshore Vietnam, after discovering multiple gas and oil reservoir
s in the southern fault block of the Dua structure. The company reported that the two reservoir intervals have been tested with the primary reservoir target flowing oil at a stable rate of 5,543 barrels of oil per day (bopd) plus 6.76 million standard cubic feet of gas per day through a 2 inch choke.
The oil and gas producer said that a deeper secondary reservoir flowed at a rate of 247 bopd through a 28/64” choke.
Santos reported that work would now commence on the resource assessment and preparation of a reservoir evaluation report, which is the first step in the commercialization process within the PSC terms.
The group said that immediately prior to drilling the southern fault block, the Dua-4X and Dua-4X ST1 wells were drilled in the northern fault block of the Dua structure.
These wells were step-outs from the 1974 Dua-1X discovery well, which flowed at a rate of 1,500 bopd from the main reservoir.
The company reported that wireline testing of both Dua-4X and Dua-4X ST1 recovered oil samples and pressure data.
Following completion of operations on Dua-5X, Santos says the rig will be moved to drill well 12E-CS-1X on the Blackbird prospect also in Block 12E.
This well will explore a large tilted fault block up-dip of a previous well that encountered very good oil shows, the company said.