The Boreas-1 exploration well – jointly held by ConocoPhillips and Karoon Gas – has reached its primary reservoir objective and the JV is aiming to start coring operations, Karoon Gas said in a statement Thursday.
The well intersected a sand interval characterized by a rate of penetration increase, sandy drill cuttings and an increase in mud log readings which indicate the presence of a potential gas-bearing reservoir.
The drilling assembly was pulled out of the hole on Thursday to allow ConocoPhillips – the well's operator – to start coring operations. A spokesperson from Karoon Gas told Rigzone on Friday that the JV has not yet decided on when coring operations will begin. The spokesperson also confirmed that there is no timeline on how long the coring activities will take.
"It is not clear at present if the well will be totally cored or partially cored. The decision on how much the well will be cored will affect the timeline," the spokesperson explained. "Wells of similar depth will require around three weeks for drilling and coring to be fully completed," the spokesperson added.
Karoon Gas stated in its progress report on August 31, 2012, that Boreas-1 was drilled to 15,764 feet (4,805 meters). The well was cemented at that point. The full depth of the well is 17,717 feet (5,400 meters), the spokesperson said.
After drilling and coring operations are fully completed, wireline logging, pressure and sampling programs will be used to define the thickness and properties of any sands penetrated, and the presence and characteristics of any movable hydrocarbons which they contain.
Boreas-1 – drilled by the Transocean Legend (mid-water semisub) rig – is the first of an exploration program by the JV. Under the drilling campaign, ConocoPhillips and Karoon Gas are aiming to drill a minimum of five exploration wells.
The principal objective of the exploration program is to better define the size and quality of the hydrocarbon accumulations within the Browse Basin exploration permits – WA-314-P, WA-315-P and WA-398-P – which are held by ConocoPhillips and Karoon Gas.
Boreas-1 is sited around 2.5 miles (4 kilometers) south of Poseidon-1 in WA-315-P on a large-tilted fault block which is part of the of the northeast trending structural high of the greater Poseidon structure.
Karoon Gas holds a 40 percent stake in WA-315-P and WA-398-P, and a 90 percent stake in WA-314-P. ConocoPhillips holds the remaining stakes in the three permits.
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