Replacing some of both technical and economical figures including CAPEX and OPEX break down, each production step rates and duration, decline rate, interest rate, reservoir oil price during reserve life (that predicted and proposed by project contractor) etc. in equation (8) and optimizing achieved function by means of a genetic algorithm approach with an initial random population with 20 chromosomes and 100 generation number ,the optimum number of development wells are propsed as 18(associated spacing may determined according to reservoir erea) and related project NPV (maximum NPV) as 1.8582E+10 USD.