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the best way to carry on a production allocation is to have first the well performance of all your wells (15 in your case), this is done through the Prosper (Petex software).
You have to provide the software with some data obviously, that concerne PVT, reservoir pressure and temerature (GOR, Water cut, salinity etc) that way you can generate for each well an IPR (inflow performance relationship) which will give you the variation of your bottomm hole flowing pressure versus rate.
To generate the aforesaid IPR you'll have also to choose the model you would like to predict with, for instance "PI entry" will request you to enter the Productivity Index of your well (PI) in addition to the Reservoir pressure, temperature, GOR and water cut; an other useful model would be "Darcy" through its "enter skin by hand" menu you can enter the skin if you have it (from well test interpretation) or enter a value of 0 (optimistic) to generate the curve.
the second step, would be to enter your completion caracteristics, well deviation, etc..under the menu "Equipement Data" that way you'l generate the lift curves or in other words, the flux equations through the tubing, called VLP (for vertical Lift Performance) under a Reservoir simulation model, they will be called VLC (C stands for Curve).
The VLP curves than, are generated entering the top node pressure (the well head) so the software can interpolate the points up to the Well Head..keep in mind that this method is called Nodal Analysis, that's why we use the words "top node2 etc.
Having the VLP ready, you'll have to plot the intersection between the 2 curves IPR/VLP, the intersection point will give you, your actual working parameters in terms of pressure and rate.
Doing this for all your wells, you'll get a good allocation.
Given also that you run some well test campaign (to assess the skin), some static pressure survey (to have a pressure profile in the well, and assess the contacts). dynamic surveys to compute the Productivity Indexes and separator tests to confirm what your well performance analysis is telling you. And doing it frequently!
A good practice would be to implement MultiPhase Flow Meters (MPFM) devices around your gathering systems, so you can check at the gathering level your rates (isolating a well line, and routing it through the MPFM).
Hope it'll help
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