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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
MICP – typical data on small samples

  • Clay destruction/texture alteration

    • pore volume increases during the test

    • distorted Pc curves





New core acquisition
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
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


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

Improved project management


Improved core analysis 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
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 pc1
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
MICP – sample damage

  • Clay destruction/texture alteration

    • pore volume increases during the test

    • distorted Pc curves




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