1 SPE Distinguished Lecturer Program Primary funding is provided by The SPE Foundation through member donations and a contribution from Offshore Europe The Society is grateful to those companies that allow their professionals to serve as lecturers Additional support provided by AIME Society of Petroleum Engineers Distinguished Lecturer Program www.spe.org/dl
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1 SPE Distinguished Lecturer Program Primary funding is provided by The SPE Foundation through member donations and a contribution from Offshore Europe.
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SPE Distinguished Lecturer Program
Primary funding is provided by
The SPE Foundation through member donations and a contribution from Offshore Europe
The Society is grateful to those companies that allow their professionals to serve as lecturers
Additional support provided by AIME
Society of Petroleum Engineers Distinguished Lecturer Programwww.spe.org/dl
Core Analysis: A Guide to Maximising Added Value
Colin McPhee
Senergy (GB) Limited
Society of Petroleum Engineers Distinguished Lecturer Programwww.spe.org/dl
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Why core matters…
• Core….– “confirms lithology and mineralogy– calibrates estimates of fundamental rock properties– shows how fluids occupy and flow in pore space– supplies mechanical properties for faster & safer
drilling and better completions”
• “Logs cannot characterize a reservoir if knowledge of the rock is absent”
• “a struggle to convince management that the project benefits from the knowledge gained”
• Uncertainty analysis– North Sea reservoir– 20% and 20% Sw– 100 MMbbl OIP– +20% error in input data
• Largest impact , m and n (core)
-30 -20 -10 0 10 20 30
phi
m
n
Rw
Rt
MMBBL
n
m Rt
RwaSw
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Pc curve distortion • Mercury injection capillary pressure (MICP)• Pre-1994: tests on 50 – 80 ml plugs• Now: most tests on < 10 ml “chips”/end trims• Pc curve (Sw versus Pc) problems
– Use Hg-filled pore volume (> 20,000 psi)– clay destruction in small pores– distorted Pc curves