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1. Gat Inj Duration 3 Months Water Inj Duration Months _ WAG Cycle Duration i Months Each of these wells must be assigned to a Group The number of possible Groups is based on the duration of the gas and water injection per WAG cycle The concept is that all WAG wells will be active once the WAG schedule is initiated A full cycle requires that all wells have injected water and gas for the defined durations once In the WAG screen above the gas injection duration has been set to 3 months by the user the default value is 1 Based on the gas injection duration the water injection duration is initially set to the same value 3 months in this case This establishes the total WAG cycle duration at 6 months 3 months of water injection and three months of gas injection As the injected gas is typically purchased from an outside source and must be used on a near constant volume basis gas injection must occur in at least some wells throughout the WAG cycle hence the need for two groups in this example one of the groups always injecting gas The number of wells in each group is up to the user The user can assign the wells to groups by dragging each well from the Unassigned column to one of the Group columns Typically wells are grouped based on surface facilities and or pattern requirements Gast Inj Duration 3 Months Water Inj Duration FE Months Select OK to save Note that the WAG schedul2. COZVIEW COZSIM User Manual Supplement No 1 Issued Date August 20 2013 This user manual supplement includes the following new functionalities e Case management e WAG Schedule Case Management General Description It is often useful in conducting a study to modify a single or a few parameters in the data and make a new simulation run Once the simulation run is complete the user will want to compare the results plots and 3D views of the two or more case In the case of plots the user may wish to show multiple case results on the same plot For 3D views the user will want to easily view the same array e g oil saturation for two different simulation cases The goal is to ease the analysis process as the user attempts to improve or compare simulated performance of alternative cases Cases are defined as a set of input data within a COZ project that have different property values for user selected properties Examples of properties that may change between cases relative permeability curves well completions well constraints 1 2 3 4 depletion strategies 5 layer properties 6 initialization properties The user is cautioned relative to creation of multiple cases with different volumetrics While this is allowed comparison of simulation results may not be appropriate WARNING The user should not change the structure well locations or grid dimensions between cases The user is cautioned to keep a record of p
3. If multiple Groups say 3 are required the cycle sequence is as follows for a total WAG cycle through all wells Group First Gas Injection Period Second Gas Injection Period Third Gas Injection Period Gas Water Water 2 Water Gas Water 3 Water Water Gas The well plot below is an example of a 1 month CO2 injection 1 month water injection WAG cycle starting in 1 1 2014 after one year of production Simulation Results for Case PTTCAOWAG Cases Well Well_1 Rate vs Date 3 Pad Cal STAD
4. Many CO2 injection projects utilize a process referred to as WAG water alternating gas Injection into designated wells is varied between CO2 and water on a defined schedule In theory this maximizes use of the scarce CO2 resource and provides mobility control for the advancing CO2 front A new functionality has been added to COZView to make scheduling of the WAG process easier Prior to this WAG scheduling had to be manually specified COZSim has been able to handle this process from the beginning Establishing WAG Injection Wells In the Well Constraints section each well used in the simulation must be identified with a specific Well Type Anew Well Type has been added WAG Well The user must identify the injection wells that will be used in the WAG process when they will start the WAG the maximum individual well water and gas injection rates and the maximum individual bottom hole injection pressure The gas injected during a WAG cycle can be hydrocarbon gas HCG or CO2 This will be identified in the Field Facility Parameters Controls section Select Done to save Well i omiri Hamr Fagen a Well Graa sth Generate WAG Scheie De Welfa Deive Date Wel Type Di kate stad Setting WAG Cycle Schedule The user must then select the WAG Schedule button Select Yes to the save query The first time this screen is entered all wells previously identified as WAG wells will be shown in the left Unassigned column
5. arameter changes between cases While COZView allows many parameters to be changed between cases only a few can be identified or retrieved by the case name in COZView New Case Initialization Changes Case management may start at the Model Initialization A selection box has been added to create a New Case or utilize the existing case A New Case name is suggested but the user can change this name as they wish A comments field is also provided to aid the user in distinguishing between cases This should be filled in by the user The user cannot return to a previous case Model Initialization Home Page This allows the user to change formation properties PVT table Saturation function table and or initialization parameters for the new case All other data from the prior case will be retained in the new case subject to changes in the Prediction Period Section When the user selects the Initialize Model button the Model Volumetrics screen will appear along with the Simulation status window Once the simulator has completed the initialization the volumetric values by phase will appear in the table The table now has a Case Name associated with each volumetric calculation otherwise there is no change from the previous version If the user has only changed pre Model Initialization data to this point and does not wish to change any well or field constraints or limits they can proceed directly to Run Simulation The user should select t
6. e will be repeated in the simulation run until the run completes or the well types are changed for the WAG wells by the user in the Well Constraint section The gas and water volumes used in each well in the WAG cycle can be changed later in the simulation run period in the Well Constraints screen but the injection duration times during the WAG cycle cannot be changed The number of months of water injection relative to the number of months of gas injection can be changed with the slide bar The duration of water injection can be changed to multiples of the gas injection duration in this case 3 months of gas 3 6 9 etc months of water Changing the water injection duration will change the total WAG cycle duration This in turn changes the number of possible groups Once the WAG groups have been established the user can view the well constraints for all wells in a given group by selecting a group from the dropdown menu in the top left corner of the Well Constraints screen CO ae Pasta cce sas conwate a sna kee Well hame facies Date Well Typa Od Eie gt TAa wil Wi aa a r BFE well a4 1 Group WAG Implementation As described above the number of Groups is dependent on the duration of injection for water and gas The user does not need to place wells in all of the Groups However not doing so will result in some portion of the total WAG cycle duration being carried out with no gas injection
7. he new Case Name created in Model Initialization Section from the dropdown menu and set the End Date to the appropriate value The simulation run will be launched accordingly Note that all well and field constraints and limits will be the same as the prior case If the user wishes to change well or field constraints or limits in addition to the Initialization parameters they may do so in the appropriate screens Be sure to Save when changes are made When the user is ready to submit the new simulation run Run Simulation they should select the new Case Name created in Model Initialization Section from the dropdown menu and set the End Date to the appropriate value Select GO to launch the simulation run New Case Prediction Period Changes Only If the user wishes to create a new Case that is based on changes to well and field constraints and limits but does not require changes to Model Initialization data they can change the data in the appropriate screens In the Field Facility Parameter Controls screen select the correct Case in the Show Constraints for box Be sure to Save when changes are made As a new case cannot be created on the Field Facility Parameter Controls screen this may require the new case to be defined on the Run Simulation screen a refresh of the Controls screen and selection of the new case on the refreshed Controls screen When the user is ready to submit the new simulation run a New Case can be created at the Run Sim
8. s to seale piati Use atic scales for piots Set Sate Selai Water STB D Case Legend 8 Nong Add Care Labels to lires Done 8 Cul S TBD E Case Summary The user can view a table of all cases run in the project under Case Management in Utility Functions in the Process Explorer section The comments field can be altered by selecting a case and the Edit button Cases can also be deleted by selecting the case and the Delete button mapi Ri z Eg Bed The status of the project data base layer properties well constraints field constraints etc is consistent with the last case run only SQL data bases for prior simulation runs are NOT retained The user is cautioned not to delete the last case run unless all cases excluding the base case are being deleted and the base case is being re formulated Deleting the last case run may result in an incomplete data base and impact subsequent simulation runs in this project File Naming Convention The file naming convention has been changed to include the case name in addition to the project name A typical file name is now Projectname_Casename COZOUT or Projectname_Casename COZdat Be sure to keep in mind the rules concerning screen refreshing A new case will not appear in a Case box if the particular screen has not been refreshed since the creation of the new case WAG Schedule General Description
9. ulation screen Be sure the new case name is selected after creating the New Case Select GO to launch the simulation run All well and field data changes will be associated with the new case name Simulation Results All plots tables and 3D Views contain a selection box for the Case All prior cases run in the project will be available for viewing in the appropriate display 2 COZView PTTC40 Plots Model Initialization Home Page Results Data Save Bitmap Clipboard Individual Stacked Select Case Select Select Use all wells to set scales Use static scales for plots Set Static Scales Done Save Bitmap Clipboard Case Select Case Z Grid DOEStaticModelSimGrid Property Select Property bi Date m _ Animate Interval Seconds View Options Z Magnify w ColorBar w Views w Items View Options Item Options v Fence Selection wl Volume of Interest Limits v Valuator Case Comparison Plots in the Simulation Results menu allows the user to compare selected field level results on any of the cases run in a project on the same display plot Pits Optimization Case Results Data Case Comparison PTTC40 PITCAO Strine K RWW Cave Batra Clipboard Cape to Compare a PrTcaa F FiA mek ey L i 5 Preaiure PS Brien ums Paris Data io Show i Chl Fi Wister CHADD J Pressure fea n A lan g Uae Min Max kom all Case
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