by ReserveGrowthRulz » Wed 18 Oct 2006, 02:06:10
$this->bbcode_second_pass_quote('RockHind', '
')To further the general education of the board, could you properly characterize natural gas production operations with respect to production curves for us?
To answer that question, you have to impose the qualifier "under what operating parameters".
For example, dual permeability systems, such as those demonstrated in hydro-frac'ed wells in low perm formations ( the frac itself tapping into natural fractures which have near infinite conductivity being one, and matrix permeability being the other )often display a hyperbolic decline, with a steep initial decline and the potential for production nearly leveling off, and lasting decades.
Better permeability formations will often display a more exponential decline, and the best formations can have a flat and stabilized decline rate until abandonment pressure is reached, at which point they can literally stop.
Because engineers watch flowing pressures as part of their daily routine it isn't difficult to make a prediction as to the time period in which a given well will produce. Reserves are booked knowing this information, and the declines, or lack thereof, are incorporated into this estimate. So its not that one day, production simply vanishes. You have the life of a companies entire reserve base to figure out on what day/month/year there production will "stop", assuming no further capital investment.
I also might mention that my specialty is more towards unconventional accumulations and well performance, and in that area, alot of the production available isn't even classified as "reserves" because of the low volumes involved. The advantage of these "reserves sorta" is that they last a LONG time, and pressure isn't the issue at all related to their longevity, but the economics of small fields/wells performance.
Did you have a specific set of operating conditions in mind? Offshore, onshore, conventional, unconventional, good perm, bad perm, associated gas or free?
So....heading into our 3rd year post peak and I'm still getting caught in traffic jams!! DieOff already!