Reservoir perforation optimization using fuzzy logic from geomechanical point of view

Reservoir perforation, with the aim of production increase, is carried out by making a constant number of shots/ft in our oilfields. However, many parameters affect the shots/ft in perforating a reservoir that include reservoir permeability and porosity, formation UCS, Poisson’s Ratio, well direction relative to minimum horizontal stress, liner outer diameter (OD), reservoir pressure and temperature, water saturation, and formation resistivity. An optimized shots/ft number can help to decrease reservoir excessive damage, proper production rate, and optimum shooting charges. It is difficult to define a unique analytical solution between those parameters and shots/ft for reservoir perforation in practice. Fuzzy logic inference system is an attractive tool to solve multi-parameter problems as it considers parameters fuzziness sharing in a solution. Using linguistic variables to describe complex problems is more useful in practical engineering. In this paper formation geomechanical parameters and reservoir properties have been determined from a full-set well log for a reservoir in an offshore oilfield. Fuzzy model has been built in Matlab using mentioned parameters as inputs and shots/ft numbers from previous applications as output. Finally, using the input and output parameters which introduced to the model, reasonable results have been obtained that can be applied in practice, economically.

Keywords:

reservoir perforation , geomechanical parameter , Fuzzy logic , production increase.