Method for optimizing reservoir production analysis

Abstract

Optimizing reservoir production in a commingled hydraulically fractured reservoir by allocating commingled system production data to each of the individual completed intervals in the system, calculating the reservoir and fracture properties for each completed reservoir layer, and recalibrating the commingled and individual layer production data by accounting for the individual completed interval reservoir and fracture properties.

1 . A method comprising:
 allocating commingled system production data to each of the individual completed intervals in the system;   calculating the reservoir and fracture properties for each completed reservoir layer; and, recalibrating the commingled and individual layer production data by accounting for the individual completed interval reservoir and fracture properties.   
     
     
         2 . A method according to  claim 1  wherein the reservoir and fracture properties are calculated using the transient and stabilized inflow performance relationship established using the multi-rate production log information. 
     
     
         3 . A method according to  claim 1  wherein accounting for the individual layer production data comprises using approximate values of the reservoir and/or fracture properties and then updating and correcting the relative input parameter estimates for every layer in the commingles reservoir system. 
     
     
         4 . A method according to  claim 1  wherein the reservoir and fracture properties comprise effective permeability, initial reservoir pressure, reservoir effective drainage area, steady state skin effect, average fracture conductivity and/or effective fracture half-length. 
     
     
         5 . A method according to  claim 1  wherein the production data comprises commingled well production data, wellhead flowing temperatures and/or pressures, the description of the complete wellbore and its tubular components and/or production log information. 
     
     
         6 . A method according to  claim 1  wherein allocating commingled production data to of the completed intervals in the system comprises using multi-rate production log information. 
     
     
         7 . A method according to  claim 1  further comprising using the well production performance data derived for each layer in the commingled system for further production performance optimization and forecasting. 
     
     
         8 . A method according to  claim 1  wherein accounting for the individual layer production data comprises using approximate values of the reservoir and/or fracture properties and then updating and correcting the relative input parameter estimates for every layer in the commingles reservoir system. 
     
     
         9 . A method according to  claim 1  whereby reservoir production in a commingled hydraulically fractured reservoir optimized. 
     
     
         10 . A method comprising:
 allocating commingled system production data to each of the individual completed intervals in the system; and,   calculating the reservoir and fracture properties for each completed reservoir layer;   whereby reservoir production in a commingled hydraulically fractured reservoir optimized.   
     
     
         11 . A method according to  claim 10  further comprising recalibrating the commingled and individual layer production data by accounting for the individual completed interval reservoir and fracture properties. 
     
     
         12 . A method according to  claim 11  wherein the recalibrating is conducted by approximating the values of some of the reservoir and/or fracture properties and then subsequently updating and correcting the relative input parameter estimates for every layer in the commingled reservoir system. 
     
     
         13 . A method according to  claim 10  wherein the reservoir and fracture properties are calculated using the transient and stabilized inflow performance relationship established using the multi-rate production log information. 
     
     
         14 . A method according to  claim 10  further comprising considerating non-Darcy fluid flow in the reservoir or hydraulic fractures in an individual layer performance analysis. 
     
     
         15 . A method according to  claim 10  wherein the reservoir and fracture properties comprise effective permeability, initial reservoir pressure, reservoir effective drainage area, steady state skin effect, average fracture conductivity and/or effective fracture half-length. 
     
     
         16 . A method comprising:
 allocating commingled system production data to each of the individual completed intervals in the system;   calculating the reservoir and fracture properties for each completed reservoir layer; and,   recalibrating the commingled and individual layer production data, wherein the production data includes any one or more of commingled well production data, wellhead flowing temperatures and/or pressures, the description of the complete wellbore and its tubular components, and production log information.   
     
     
         17 . A method according to  claim 16  whereby reservoir production in a commingled hydraulically fractured reservoir optimized. 
     
     
         18 . A method according to  claim 16  wherein the reservoir and fracture properties are calculated using the transient and stabilized inflow performance relationship established using the multi-rate production log information. 
     
     
         19 . A method according to  claim 16  further comprising considering non-Darcy fluid flow in the reservoir or hydraulic fractures in an individual layer performance analysis. 
     
     
         20 . A method according to  claim 16  wherein the reservoir and fracture properties comprise effective permeability, initial reservoir pressure, reservoir effective drainage area, steady state skin effect, average fracture conductivity and/or effective fracture half-length.