Cooper reports further success at Bunian-3 well

By Romel S. Gurky

ASX-listed Cooper Energy Limited reports further success from the testing of the Bunian-3 ST2 development well in the Sukanti KSO, South Sumatra, with the flow testing of the secondary target K1 sand.

The company said in a statement Monday that the K1 sand flowed for 18 hours at a flow rate equivalent to1,590 barrels per day through a 1/8 inch choke, with a flowing tubing head pressure of 1,050 psi. The flow, which consisted of 41 API oil and gas with trace water, was choked back from an initial rate equivalent to 2,400 barrels of oil per day due to surface test facilities constraints.

This K1 sand test flow rate is additional to the previously reported (April 27 2015) flow from the primary target TRM3 sands equivalent to1,742 barrels of oil per day, which was also limited by surface facilities.

Cooper said oil flows are being directed to a temporary production facility and produced oil is being trucked to a pumping station for delivery to market.

Analysis of the increase in reserves attributable to the TRM3and K1 sands will be completed after the conclusion of the production tests.

Cooper Energy Managing Director David Maxwell said ?Bunian-3 has delivered results well on the high side of our expectations with this oil pool discovery in the K1 reservoir and the excellent oil flows recorded from the TRM3 reservoir. We are now working to quantify the estimates for increased production and increased reserves from the Bunian field?.

Maxwell said the company is also evaluating the most cost effective methods for realising the potential identified at Bunian-3. ?Flows from both zones were limited because of the constraints of the current surface infrastructure. There are also further opportunities identified in the TRM1 andTRM2 sands which can be assessed in subsequent drilling?.

Elsewhere, Cooper said Initial analysis of the pressure data acquired during the TRM3 test indicates that the TRM3 sand in Bunian-3 ST2 is hydraulically connected to the TRM3 sand in Bunian-1.

	Test 1	Test 2	Units
Formation drilled	TRM3	K1
Geological rock type	Sandstone	Sandstone
Depth of zones tested	1,401.1 ? 1,414.6	1,484.7 ? 1,503.3	metres TVDSS(?)
Perforated Interval	3.5	2.6	vertical metres
Test type & duration	Production Test 19 hours total flow period	Production Test 18 hours total flow period
Hydrocarbon phases	Gas / Oil	Gas / Oil
Oil Gravity	35	41	degrees API
Material volumes of non-hydrocarbons	Trace Water 0.8% BS&W(?)	Trace Water 0.2% BS&W(?)
Choke size	10/64? - 12/64?	8/64?	inches
Oil volume recovered	1,446 barrels recovered in 19 hour flow period	1,190 barrels recovered in 18 hour flow period
Flow rates	Oil 1,742 barrels per day Gas 1.25 mmscf/day	Oil 1,590 barrels per day Gas 1.8 mmscf/day
(?)TVDSS = True Vertical Depth Sub Sea  (?) Base sediments and water

Editing by Reiner Simanjuntak