Hello, Petengr.
The question you raise is very complex since it involves several disciplines which are
1. Resrvoir engeeniring - to create subsurface model
2. Well design and infructructure engeeniring - to create exact wells and facilities to handle project oil,gas,water rates
3. Marketing - to plan routes for sales and culculate final Net price for oil and gas
4. Cost engeeniring - to estimate capital operational, non operational, administrative costs
5. Fiscal - to fit cash flow exactly to choosen PSA terms or current fiscal system
6 Economics - to calculate key economical indicators like NPV, ROR, IRR, PVR etc.
As you can see this is question of big project company and in reality this is so, but if you whan to try i can explain logic befing this process...
the main startegy here is maximising your NPV nad IRR , since all oil companies has share holders who whants more profit on any dollar envested so
Do do this you need to create several paternt of will spacing + include cases with injection since pressure drop in reservoir could lead to changes in oil production.
Create several cases on natural deplition, run cases calculate economics .
Choose 3 cases from that you ve done with less , mid , high count of wells
Create injection case
Calculate economics
range caseses based on IRR and NPV.
The main problem here is operating and capital cost of drilling and surface infrastructure
So use questor onsore or offshore software for expenditures