RE: No more AIM Flutters for me!27 Jul 2019 17:49
i think i got something mixed up one graph shows what i said the other source tells me that the gas flow rates will improve for a few years before reaching peak, and the more gas saturated it it the less time it should take and the better the gas flow rates...
For coals that are 100% gas saturated, gas will be produced as soon as the pressure is decreased by producing water from the cleats. Gas rates will ramp up to a peak over several years and then decline. For undersaturated coals, gas will not be produced until the pressure in the cleats has been drawn down below the saturation pressure. Gas will be liberated more slowly, resulting in a longer period to achieve peak gas rates, as well as lower peak rates. There have been several cases in which companies have drilled numerous development wells based on early gas rates of a few hundred Mscf/D per well, believing that the rates would increase substantially with additional dewatering and well interference. Failure to recognize the undersaturated state of their coals and the impact of this condition left them with dozens of low-rate, marginally economic or uneconomic wells.
this would imply that early gas rates are not so telling anyways, unless they have a way of estimating it, which seems unlikely given that they are taking the actual gas flow rates now !?