Gor

[ahmedj9579]

well I was too much in hurry!
so here is the long story:
the GOR-Rs should be used as a tabulated form (keepins in an excel spreadsheet the Rs reference cell fixed) multiplying this by the current gas production (let's say the monthly average production for each month) will lead you to the free gas amount built monthly.

The so-called free gas is all what is down in the reservoir NOW and that wasn't before when the field was brand virgin!
we call secondary gas cap, the free gas that built up after some years of production which is the result of a Reservoir pressure decrease bellow or near Pb

In terms of plotting results, my advice would be to plot the GOR vs time and a straight line for Rs when both line intersect is the time your GOR started increasing from its original value, the slop of the GOR trend can only be used as indication of th velocity the GOR is increasing.
Keep in mind that if you have an injector near by, you have to be causcious as it is likely that the GOR your are measuring at surface is the results of a combined effect (Rs, pressure and injection breakthrough) thats' why you have to have a clear image of what's going on (reservoir characteristics i.e. mainly permeability, producing zones/layers, static pressure historical trend or MDTs and injection/production data)

Good luck!
--
Kader

good good good many thanks for this clarification. but normally for an oil field and what we should have is a staight line of the GOR vs time else we can't rely on production data.( especially when we are working above the bubble point?)