Sydney Gas said it and operator AGL Energy have identified four potential locations in the Camden development where wells could be drilled to assess the conventional gas exploration target.
The first of these is AP01, the location of a previous CSM exploration well that could be re-entered and deepened to the Marrangaroo horizon.
Rig-28 has drilled forward a 4¾-inch open-hole at AP01, using a water-based mud system to 860m, which was about 12m above the original Marrangaroo horizon prognosis of 872m.
Sydney Gas said two gas samples from AP01 have been obtained for analysis, which may assist in identifying hydrocarbon gas concentration in the open-hole interval.
“The go-forward plan is to convert back to a water-based KCl mud system, which is more suitable for a full suit of wireline logs, prior to logging, which will be done next for a more precise identification of these horizons,” it said.
Meanwhile, Sydney Gas also said it had completed the drilling of deviated wells RB08 and RB09, which intersected the Bulli seam at measured depths of 650m and 720m, respectively.
It said both wells have been cased and cemented and are now ready for fracture stimulation, which is scheduled for May.
The company also said dewatering of surface to in-seam wells (SIS) GL14 and GL15 is progressing “very satisfactorily”.
GL14 has produced gas at an average rate of 960,000 cubic feet per day between March 1 and 18 and is the best producing well in the field, it said.
As of March 19, GL15 produced gas at about 600,000cfd, but has not stabilised at this production rate. Sydney Gas said it is currently increasing production at 10,000-20,000cfd.
“We expect both wells will continue to clean up prior to maximum gas production, which is characteristic of the historical performance at Camden,” the company said.
A third SIS well, EM34, is in the early stages of dewatering and is already showing signs of gas production.
To date, three SIS wells have been drilled in the Camden Project area. The JV is planning to drill up to a further three SIS wells during this financial year, although recent weather related delays may see this target slip into the following financial year.
At present more than 13 terajoules per day of gas is being produced through the Camden Plant, which is the highest sustained daily performance to date.
AGL Energy is operator of the Camden Gas Project in a 50:50 joint venture with
Sydney Gas.
