CONOCOPHILLIPS has abandoned the Poseidon North 1 well, being drilled in permit area WA 315 P offshore Western Australia, after testing returned inconclusive pressure data.

The well was the fifth drilled by the company since 2012 in its Browse basin Phase 2 exploration drilling program.

The program aims to define the size and quality of the contingent gas resource contained in the Greater Poseidon structure.

Project partner Karoon Gas Australia said the well had reached a total depth of 5,288 metres in early May, hitting gas bearing sands of Jurassic age across a 20 metre gross, 12 metre net reservoir interval.

“However pressure data is inconclusive and sample analysis remains outstanding which is required to confirm the presence of mobile gas,” the company said.

“The well will now be plugged and abandoned with no further evaluation planned.”

The project partners had abandoned the previous well in the program, the Grace 1 exploration well in WA‐314‐P, in January after no significant hydrocarbons were encountered during testing.

But the companies had greater success with the Proteus ST2, which started producing condensate gas in September last year, with the Kronos 1 and Boreas 1 wells also having been production tested.

The project partners will drill final well in the program, Pharos 1, in permit WA 398 P, targeting an extension of the discovery made at Proteus 1.

Pharos 1 is located about nine kilometres north east of Proteus 1 which established excellent reservoir quality and condensate bearing gas in the Montara formation.

ConocoPhillips is using the Transocean Legend semisubmersible rig for the well, Karoon said.

The well had been drilled to a depth of 2,330 metres at the time of going to press.

ConocoPhillips holds a 60 per cent operating stake in the WA 315 P and WA 398 P permit areas, with Karoon holding 40%.

The supermajor is also operator of the jointly held WA‐314‐P Browse basin permit in which Karoon Gas Australia holds 90%.