State Gas' Nyanda-4 producing CBM below 1,150 m
Australian gas explorer State Gas on June 24 said production log testing at Nyanda-4 had confirmed that in addition to gas production from coalbeds between 400 m and 1000 m, gas is being successfully produced at depths below 1,150 m. This is well below the usual depths regarded as the limit for the production of coalbed methane (CBM).
State Gas is appraising the CBM potential of its 100% owned Reid's Dome project at PL231 in Queensland. The coals at Reid's Dome extend to depths well below those usually regarded as productive, it said.
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“The particular geological features of the dome, as well as analogue wells elsewhere, led to the company's hypothesis that the coal seams would produce gas from much deeper than is typical. This hypothesis has now been proved,” State Gas said.
The company has been production testing the Nyanda-4, Nyanda-7 and Nyanda-8 wells at Reid's Dome. Gas flow data from those tests strongly indicated that gas is being produced from the lower seams. To confirm that this is the case, State Gas recently ran a production log testing at the Nyanda-4 well.
The Nyanda-4 well intersected 40 m of net coal, between 394 m and 1,177 m, with the lowest coals positioned just above the bottom of the well at 1200 m depth.
“The confirmation of gas production at greater depths is commercially important in confirming not just more productive zones in the Reids Dome beds, but also a much larger productive area,” the company said.
Richard Cottee, executive chairman of State Gas, said these results prove conclusively that the company can produce economically at depths exceeding 1,000m naturally, unaided by any form of stimulation.
“We can now show that coals at these depths in Reid's Dome need to be included in assessments of the field's production potential, right down the full depth of the wells," he said.
On completion of the production log testing, Nyanda-4 was returned to production and is currently producing 138,000 ft3/day. The Nyanda-7 and Nyanda-8 wells at Reid's Dome are producing 7,000 ft3/day and 38,000 ft3/day respectively.