MICP

1
MICP typical data on small samples

• Clay destruction/texture alteration
• pore volume increases during the test
• distorted Pc curves

2
MICP curves - then
3
MICP curves - now
4
Irreducible water saturation, Swirr
5
New core acquisition

• What core analysis tests do we need?
• dont 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

6
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

7
Improved project management

• 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

8
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
9
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
10
Back Up Slides
11
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

12
Porous plate Pc
500
Underestimate OIP in Sw-height models

• 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

400
Air-water capillary pressure (psi)
200
100
0.2
0
0.8
1.0
Water Saturation (v/v)
13
Formation factor (F) and m
14
Resistivity index (I) and n
15
MICP sample damage

• Clay destruction/texture alteration
• pore volume increases during the test
• distorted Pc curves

16
SPE August 2010
17
Example plug history sheet