...4 Sep 2019 11:42
interesting info on comet ridge well performance
This work was undertaken in mid-December 2014 and the pump was put on line with water production commencing on 28 December 2014. The Mahalo 7 surface to in-seam horizontal well was designed to maximise the use of current reservoir data and has been positioned inside the current pilot wells. The well contacted approximately 360 metres of coal in the horizontal hole section.
The Mahalo 6 vertical production well was utilised to lift water from the Mahalo 7 horizontal well. Pump speed was initially kept low and constant such that a very gradual pressure drawdown was applied to the Mahalo 7 horizontal well section. After several months, three small pump speed increases were applied to the Mahalo 6 well with a significant increase in gas rate achieved. At the same time, the remaining vertical wells (Mahalo 3, 4 and 5) were shut in with downhole pressures monitored closely. Significant pressure responses were measured in all three wells as the pressure in the Mahalo 6 / 7 combination decreased, suggesting a well-connected network of fractures linking the horizontal well with the other Mahalo wells.
In March 2016, the Mahalo 6/7 Vertical-Horizontal well combination reached a gas flow rate of 426,000 scf/d (standard cubic feet per day).
1 year and 3 months to get to 426 mcfd ...been around 4.5 months for us from memory
further rns's will be very revealing imo, and would like to hear more about the process itself to be honest...