Producing Hydrocarbons from a Subsurface Reservoir

Abstract

Systems and methods of producing hydrocarbons from a reservoir using a plurality of injection wells include receiving reservoir parameters, initial pressures, and target pressures. A reservoir model incorporating reservoir parameters and initial pressures is run to identify initial injection targets to achieve target pressures. Based on initial injection targets, an injection schedule is developed that minimize the overall power consumption of pumps associated with the plurality of injection wells using an allocation module incorporating operational constraints of the pumps and the pumps are controlled to implement the injection schedule.

What is claimed is: 
     
         1 . A method of producing hydrocarbons from a reservoir using a plurality of injection wells, the method comprising
 receiving reservoir parameters, initial pressures, and target pressures;   running a reservoir model incorporating reservoir parameters and initial pressures to identify initial injection targets to achieve target pressures;   based on initial injection targets, develop an injection schedule that minimize the overall power consumption of pumps associated with the plurality of injection wells using an allocation module incorporating operational constraints of the pumps;   controlling the pumps to implement the injection schedule; and   producing hydrocarbons through production wells associated with the plurality of injection wells.   
     
     
         2 . The method of  claim 1 , wherein the injection schedule comprises daily injection rates for the plurality of wells for an upcoming scheduling horizon. 
     
     
         3 . The method of  claim 2 , wherein the upcoming scheduling horizon extends for a month. 
     
     
         4 . The method of  claim 2 , wherein the daily injection rates for the plurality of injection wells comprises a daily injection rate for each well of the plurality of injection wells. 
     
     
         5 . The method of  claim 2 , wherein the daily injection rates for the plurality of injection wells comprises a daily injection rate for groups of wells of the plurality of injection wells. 
     
     
         6 . The method of  claim 1 , wherein the allocation module is implemented with mixed integer programming. 
     
     
         7 . The method of  claim 1 , wherein each well of the plurality of injection wells is associated with a water injection plant. 
     
     
         8 . The method of  claim 7 , wherein the allocation module is configured to incorporate constraints reflecting the configuration of the plurality of injection wells and the water injection plants. 
     
     
         9 . The method of  claim 8 , wherein the constraints control a total supply of each water injection plant to fall between the aggregated minimum and maximum limits of operating pumps for that specific water injection plant. 
     
     
         10 . The method of  claim 9 , wherein the constraints limit total injection to each flank of the reservoir to between minimum and maximum allowed rates. 
     
     
         11 . The method of  claim 9 , wherein the constraints balance supply from each water injection plant with the rate from its pumps. 
     
     
         12 . The method of  claim 9 , wherein the constraints require the water supplied by a water injection plant is equal the water rate of connected receiving water injection plant. 
     
     
         13 . A method of producing hydrocarbons from a reservoir using a plurality of injection wells, the method comprising
 receiving reservoir parameters, initial pressures, and target pressures;   running a reservoir model incorporating reservoir parameters and initial pressures to identify initial injection targets to achieve target pressures;   based on initial injection targets, develop an injection schedule that minimize the overall power consumption of pumps associated with the plurality of injection wells using an allocation module incorporating operational constraints of the pumps; and   controlling the pumps to implement the injection schedule.   
     
     
         14 . The method of  claim 13 , further comprising producing hydrocarbons through production wells associated with the plurality of injection wells. 
     
     
         15 . The method of  claim 13 , wherein the injection schedule comprises daily injection rates for the plurality of wells for an upcoming scheduling horizon. 
     
     
         16 . The method of  claim 15 , wherein the daily injection rates for the plurality of injection wells comprises a daily injection rate for each well of the plurality of injection wells. 
     
     
         17 . The method of  claim 16 , wherein the daily injection rates for the plurality of injection wells comprises a daily injection rate for groups of wells of the plurality of 56 injection wells. 
     
     
         18 . The method of  claim 17 , wherein each well of the plurality of injection wells is associated with a water injection plant. 
     
     
         19 . The method of  claim 18 , wherein the allocation module is configured to incorporate constraints reflecting the configuration of the plurality of injection wells and the water injection plants. 
     
     
         20 . The method of  claim 19 , wherein the constraints control a total supply of each water injection plant to fall between the aggregated minimum and maximum limits of operating pumps for that specific water injection plant.