(Karoon Gas Australia Ltd., 20.Mar.2015) – Karoon Gas Australia Ltd.’s disclosed that the Kangaroo-2 appraisal well, located in exploration Block S-M-1165, confirmed a 820 foot (250 meter) gross or 443 foot (135 metre) net oil column in Paleocene and Maastrichtian aged reservoirs, announced November 26, 2014. Karoon is the operator and has a 65 percent interest in the jointly held Block S-M-1165, Santos Basin, Brazil. Pacific Rubiales Energy Corp. holds the remaining 35 percent interest.
As at 0600 hrs AEST January 6, production testing over the Paleocene A, B and C oil bearing reservoirs was complete. Preparations are underway to commence a side-track program to better define the resource size and recovery factors. The results from the test are as follows:
Oil Flow Rate
Production test DST-2A was conducted in the Paleocene A, B and C sandstone reservoirs over the intervals 5,456-5,515 feet (1,663- 1,681 meters) rotary table (RT), 5,561-5,672 feet (1,695-1,729 meters) RT and 5,692-5,751 feet (1,735-1,753 meters) RT with a 12 hour main flow period. The maximum oil flow rate attained was 3,700 stock tank barrel per day or stb/d (stabilized rate of 3,450 stb/d) through an 88/64 inch choke with a flowing tubing head pressure of 270 psia, a gas-oil-ratio of 540 standard cubic feet (scf)/stb.
Production test DST-2 was conducted in the Paleocene C sandstone reservoir over the interval 5,692-5,751 feet (1,735-1,753 meters) RT. The maximum oil flow rate attained was 2,500 stb/d through a 44/64 inch choke with a flowing tubing head pressure of 425 psia and a gas-oil-ratio of 450 scf/stb. The well was then flowed on a 40/64 inch choke at a stabilised rate of 1,820 stb/d with a flowing tubing head pressure of 420 psia, a gas-oilratio of 450 scf/stb.
At the end of a main 24 hour flow period, the well was shut-in for a 48 hour pressure build-up period.
Oil Specification
DST-2A produced a 33 degree API oil with zero carbon dioxide (CO2), hydrogen sulfide (H2S), water or sand produced.
DST-2 produced a 31 degree API oil with zero CO2, H2S, water or sand produced.
Production Well Potential
Based on the oil rates obtained in DST-1A (Maastrichtian section) and DST-2A (Paleocene section), Managing Director, Robert Hosking said “Karoon is very pleased with the production testing results from Kangaroo-2. Based on the flow rates achieved in both the Paleocene and Maastrichtian reservoirs, a vertical production well could produce 6,000 to 8,000 stb/d from the combined reservoirs. In addition, horizontal production wells could be expected to produce at higher rates. “
Kangaroo-2 Side-Track Program
After the well testing string is removed and the Paleocene reservoirs are plugged back with cement and a cement retainer, the well will be side-tracked in both a down-dip and up-dip location in order to better define the resource size and recovery factors.
Side-track-1 will be drilled to a down-dip location to target the Paleocene and Maastrichtian reservoirs on the eastern side of an interpreted north-south trending fault, and to evaluate potential hydrocarbon accumulations in the Campanian. Wire-line logs and a pressure survey will be conducted.
Side-track-2 will be drilled into Paleocene and Maastrichtian reservoirs in an up-dip location to test reservoir and hydrocarbon potential towards the salt wall.
The information obtained from Kangaroo-2 will be important for assessing the commerciality of the Kangaroo oil field and will be valuable for a Front End Engineering and Design (FEED) phase bringing the project a step closer to commerciality.
The Kangaroo-2 appraisal well is located in exploration Block S-M-1165, approximately 984 feet (300 meters) up-dip and 2.4 miles (4 kilometers) south of Kangaroo-1 and is the first well in the Santos Basin exploration and appraisal drilling campaign.
Forward Program
Following the completion of all operations on the Kangaroo-2 appraisal well, the rig will be moved to drill Kangaroo West-1 exploration well (the second firm well in the program) and evaluate the prospect approximately 2.8 miles (4.5 kilometers) distant on the western side of Kangaroo salt structure.
Due to the large size and proximity to Kangaroo, a successful outcome at Kangaroo West-1 would materially add to any possible development of the Kangaroo oil field.
The exploration and appraisal drilling campaign is expected to continue through first half 2015.
The rig contract provides Karoon with 2 firm wells plus 2 option wells, and, in the event of a successful drilling outcome in the first 2 wells provides maximum flexibility for further appraisal of the Kangaroo oil discovery, additional drilling at Kangaroo West or possibly targeting other prospects.
The salt flank play was first proven by Kangaroo-1 with the intersection of a 249 foot (76 meter) gross oil column and oil recovered to surface from wireline DSTs. Results of the Kangaroo-2 further confirm the viability of the play. Kangaroo West-1 is located on the western flank of the same salt structure as Kangaroo-1 and has the same trap type and reservoir and seal intervals that have been mapped into the prospect from surrounding wells.
The Olinda Star (mid-water semisub) is drilling the entire campaign.
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