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Improved Oil Recovery in Mississippian Carbonate Reservoirs of Kansas DE-FC22-93BC14987. Timothy R. Carr, Dana Adkins-Heljeson, Saibal Bhattacharya, Alan P. Byrnes, Evan K. Franseen, Paul Gerlach, Willard (Bill) Guy, Richard Pancake, and W. Lynn Watney. Kansas Challenges.
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Improved Oil Recoveryin Mississippian Carbonate Reservoirsof KansasDE-FC22-93BC14987 Timothy R. Carr, Dana Adkins-Heljeson, Saibal Bhattacharya, Alan P. Byrnes, Evan K. Franseen, Paul Gerlach, Willard (Bill) Guy, Richard Pancake, and W. Lynn Watney
Kansas Challenges • Small Independent Producers • 3,000 Oil and Gas Operators • Wells (33,104 wells < 5 BOPD) • Low Rate, High Water Cut • Inadequate Reservoir Characterization • Drilling and Completion Design Problems • Low Recovery Factors • Non-Optimal Primary Recovery • Operations at or Near Economic Limits
Kansas Approach • Develop Cost-Effective Technologies • Reservoir Description and Management • Using “best” data • Evaluation Methods • Spreadsheet log analysis software (PfEFFER) • Online Dissemination • Information • Technology • Demonstration • Horizontal Drilling • Infill Drilling
Large Potential Target Regan & Granite Pennsylvanian (Virgilian) 2 % 3 % Pennsylvanian (Missourian) ARBUCKLE 23 % 32 % Pennsylvanian (Desmoisian) 8 % Mississippian Pennsylvanian (Morrow) 19 % 3 % Upper & Middle Pennsylvanian Ordovician (Other) 8 % Hunton 1 % 1 % Total Production 6.6+ Billion Barrels
Ness County, Kansas • Numerous Targets • Regional Level
Reservoir FaciesSkeletal Wackestone - Packstone Ritchie 2 Schaben P
Petrophysical Analysis Super Pickett Plot Reservoir Porosity Saturation Pay Height BVW Perforation: 4400-4404 Produced 85 bopd & 132 bwpd
Remaining Oil Saturation • Poor Lateral Drainage
Reservoir Simulation Infill Drilling Targets So > 40% & Payheight > 20 ft.
Horizontal Wells • Tools for Identifying Candidate Applications • Production Data Analysis • Geologic Mapping • Integration of Production and Geologic Data • Field & Lease Level Volumetrics • Reservoir Characterization/Simulation • Field Demonstration - Horizontal Infill Well • Completed and Planned
IntegratingProduction & Geologic Data Poor Sweep - Vertical Wells in Updip Stratigraphic Trap Welch-Bornholdt- Wherry Field Rice County Kansas
Field Level Volumetrics OOIP/Qtr Section Welch-Bornholdt-Wherry Fields Discovered: 1924 Producing Reservoir: Mississippian Osage Trap Type: Stratigraphic Cumulative Production: 60 MMBO Original Oil in Place per Quarter Section CI: 500 MBO / qtr. section Using data from one type well per 1/4 section = 10 MMBO = 5 MMBO
Field Level VolumetricsRecovery Efficiency Recovery Efficiency per Quarter Section CI: 2% Welch-Bornholdt-Wherry Fields = 18% = 2%
Ness County, Kansas • Numerous Targets • Regional Level
Ness City North Field • Numerous Targets • Local Level
Reservoir CharacterizationGeologic Model Geologic model: log (Gr, Res), core, production, DST data Maps & cross-sections of Mississippian sub-units: 5 layered reservoir model
Reservoir Heterogeneity • Strong Horizontal Heterogeneity • 10’ - 100’ Interval • Karst Controlled • Result Poor Lateral Drainage
Initial Production IP: 85 BOPD & 54 BWPD (4/29/00) Daily Prod: 55 BO& 50 BW for 2-1/2 months (May to mid-July) with1000’ of fluid over pump
Lessons Learned • Operational Flexibility (Maintain Your Options) • New Well vs. Reentry • Hole Size • Drilling Fluids • Case off the Curve • Line the Lateral • Good Planning • Communication • “The Lateral is a Piece of Cake” • Horizontal Heterogeneity
Well and Production Data Ness City North Schaben
Gemini Modular Approach Gemini User/Project Module Field Level Analysis Applets Well Level Analysis Applets Volumetrics Module Well Profile Module Cross Section Module KGS Server apache - jserv PfEFFER Module Material Balance Module Java Servlets DST Module KGS Database & Files Synthetic Seismic Module PVT Module Fluid Catalog KHAN Rock Catalog Rock & Fluid Characteristics Applets
Gemini -Well Profile Module Table: Formation Name Type GEMINI_USER_KID N(10) WELL_HEADER_KID N(10) ZONE_NUMBER N(6) API_NUMBER V(40) TYPE_OF_ZONE N(2) FORMATION_NAME V(40) DATA_SOURCE V(40) START_DEPTH N(8,2) END_DEPTH N(8,2) DATE_MODIFIED D PFEFFER_KID N(10)
Gemini -PfEFFER Module Table: Pfeffer_Computed Name Type PFEFFER_KID N(10) BUTTON N(2) BUTTON_ORDER N(4) BUTTON_SELECTED N(2) LAS_KID N(10) RADIO_BUTTON N(2) CURVE_NUMBER N(4) CURVE_MNEMONIC V(100) VALUE N VALUE2 N CORRECTED N(2) CORRECTED_VALUE N TRACK N(2)
Kansas Approach • Develop Cost-Effective Technologies • Reservoir Description and Management • Using “best” available data • Evaluation Methods • Spreadsheet log analysis software (PfEFFER) • Online Dissemination • Information • Technology • Demonstration • Horizontal Drilling • Infill Drilling