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MICP – typical data on small samples. Clay destruction/texture alteration pore volume increases during the test distorted Pc curves. MICP curves - then. MICP curves - now. Irreducible water saturation, Swirr. New core acquisition. What core analysis tests do we need?
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MICP – typical data on small samples • Clay destruction/texture alteration • pore volume increases during the test • distorted Pc curves
New core acquisition • What core analysis tests do we need? • don’t pick tests from a menu • review legacy data for uncertainties & gaps • Is the contractor interpretation correct? • “raw” data needed to check and verify • Can operators improve on the lab interpretation? • “end users must not abdicate their responsibility for the interpretation of core data”
Planning for core analysis • Well operations • core bit, mud, tracers, preservation • core handling and stabilisation • Stage analysis program • to suit business needs • flexibility in-built
Project team The lab is part of the team! Single operator focal point Real time quality control Improved documentation test specifications & reporting invaluable in unitisation Key Personnel Drillers/well operations Wellsite geologists Mud engineers Company geologists Company petrophysicists Coring company Core analysis vendor Improved project management
Improved core analysis management • Better core • Coherent and consistent core analysis • Added value • data redundancy less than 10% • Labs more involved and aligned with stakeholder objectives • Full data audit trail • better equity and unitisation positions • Less uncertainty in reservoir models Price is what you pay. Value is what you get - Warren Buffet
Core Analysis: A Guide to Maximising Added Value Questions & discussion Colin McPhee Senergy (GB) Limited Society of Petroleum Engineers Distinguished Lecturer Program www.spe.org/dl
Porous plate Pc Semi-permeable membrane capillary contact medium Loss of capillary contact air/oil enters porous plate or contact medium before sample fully desaturates Non-equilibrium saturation plate permeability is low brine relative permeability low drainage through plate is slow
Porous plate Pc Semi-permeable membrane capillary contact medium Loss of capillary contact air/oil enters porous plate or contact medium before sample fully desaturates Non-equilibrium saturation plate permeability is low brine relative permeability low drainage through plate is slow 500 Underestimate OIP in Sw-height models 400 Air-water capillary pressure (psi) 200 100 0 0.2 0.8 1.0 Water Saturation (v/v)
MICP – sample damage • Clay destruction/texture alteration • pore volume increases during the test • distorted Pc curves
