Camden Gas updates
Posted: 23 March 2007
Sydney Gas Ltd today advised that the Camden Gas Joint Venture between Sydney Gas Ltd and AGL Energy Ltd completed the drilling of deviated wells RB08 and RB09 on 2 March and 15 March 2007.
Dr Phillip Moore, Managing Director of Sydney Gas Ltd said that wells RB08 and RB09 completed drilling after reaching a total depth of approximately 710m and 784m respectively.
“Wells RB08 and RB09 intersected the Bulli seam at measured depths of 650m and 720m respectively. Both wells have been cased and cemented and are now ready for fracture stimulation, which is scheduled for May,” Dr Moore 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 Mscf/day for the period of 1-18 March 2007 and is the best producing well in the field. As at 19 March, GL15 produced gas at an approximate rate of 600 Mscf/day. GL15 has not stabilized at this production rate; it is currently increasing production at 10 – 20 Mscf/d.”
“We expect both wells will continue to clean up prior to maximum gas production, which is characteristic of the historical performance at Camden. However, at present there is some evidence that bottlenecks in the surface gathering network are limiting the combined flow from these two wells in the Glenlee area, which are produced into the same section of the network system.”
A third SIS well, EM34, is in the early stages of dewatering and is already showing signs of gas production.
This well is being monitored closely to evaluate its production potential as it has been drilled in a geological area within the field that is thought to have lower permeability than GL 14 and GL 15.
At present more than 13 TJ/day of gas is being produced through the Camden Plant, which is the highest sustained daily performance to date.
A higher flow rate and resulting higher ultimate recovery is expected from an SIS well compared to a vertical well as a result of the larger drainage area to be swept by an SIS well.
Reservoir simulation studies indicate well performance of 2-6 times that of a vertical well depending on reservoir heterogeneity.
To date three SIS wells have been drilled in the Camden Project area. The Joint Venture 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.
It is anticipated that the application of this drilling technique will allow further commercial exploitation of gas reserves that would otherwise be difficult to access.