Take Two for Kyalla Drilling31 Jan 2020 04:14
Take two for drilling long sideways hole for fracking
Chris McLennanChris McLennan
JANUARY 31 2020 - 8:38AM
Local News
Origin's Kyalla 117 is the first well to be drilled since the moratorium was lifted to explore for shale gas in the Beetaloo Base near Daly Waters. Picture: Origin Energy.
Origin's Kyalla 117 is the first well to be drilled since the moratorium was lifted to explore for shale gas in the Beetaloo Base near Daly Waters. Picture: Origin Energy.
Gas companies are ready to start drilling again after striking trouble at the showpiece Kyalla 117 well near Daly Waters.
Origin Energy and exploration partner Falcon Oil and Gas yesterday announced work had started to drill a horizontal hole from its deep well in preparation for fracking.
The companies were unexpectedly forced to plug the first hole drilled sideways in its deep horizontal shaft several weeks ago.
Origin Energy says the "operational challenges" which led to the plugging of a long horizontal shaft on its Kyalla 117 well exploring for gas near Daly Waters were "not uncommon".
Kyalla 117 was the subject of a celebratory NT Government media release back in October saying the first steps towards developing an onshore gas industry in the NT had been made after a three-year moratorium.
Primary Industry and Resources Minister Paul Kirby in October said the successful drilling of the Kyalla 117 well, as part of Origin's Beetaloo Exploration Program, was a milestone.
The companies said work had started to "sidetrack" from the vertical shaft to drill the new horizontal hole.
"This new horizontal section will again target a lateral length of 1000 to 2000 metres within the Lower Kyalla shale at a depth of 1800 metres," the companies announced.
"Drilling results to date have been encouraging," Falcon chief executive Philip O'Quigley said.
"Falcon remains very optimistic about the potential of the lower Kyalla shale play," he said in a statement to the London Stock Exchange yesterday.
"We look forward to updating the market as further results become available."
By the end of November, the companies had successfully drilled the vertical shaft almost two kilometres deep into the Beetaloo, finding a 900 metre gas-rich layer of shale as they did.
After completing the vertical shaft, the success of fracking is being able to drill sideways from that main shaft, to drill a long horizontal shaft the width of a dinner plate.
It is this drill hole which is fracked, to open up the fractures in the shale to release the gas.
Earlier in the month, Origin general manager for Beetaloo and Growth Assets Tracey Boyes said there were no issues with well integrity.
How a fracking well looks. Graphic: Origin Energy.
How a fracking well looks. Graphic: Origin Energy.
"We're drilling horizontally in a 50m thick shale that's over a kilometre below the nearest aquifer, with several layers of impermeable rock in between," Ms Boyes said.
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