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Formation Pressure Measurement
Konul Alizada - Geologist
0. 10. 20. 30.
0.
500.
1500.
Time (hours)
rates
STB/D
0. 10. 20. 30.
4000.
4500.
5000.
5500.
6000.
pressure
PSI
102/01/01-1200 : N/A
(2000 STB/D, 24 hrs)
(5500 psi)
0. 10. 20. 30. 40.
0.
400.
800.
Time (hours)
rates
STB/D
0. 10. 20. 30. 40.
5000.
5400.
5800.
pressure
PSI
102/01/02-0000 : N/A
(1000 STB/D, 24 hrs) (shut in for 24 hrs)
(5800 psi)
Formation pressure
nearly equals
sandface pressure
Kmc << Kf
Ps Sandface Pressure
Large pressure drop through mudcake
Pmh
• Permeable zones: low supercharge
Pf  Ps
SUPERCHARGE EFFECT
• Tight zones: high supercharge
Formation pressure
much lower than
sandface pressure
Pf << Ps
Small pressure drop through mudcake
Pmh
Kmc  Kf
SUPERCHARGE EFFECT
SUPERCHARGE EFFECT
Fluid Identification (FLID) Section
Density Resistivity Capacitance
Pressure
Fluid Temp
3 ft
• Compact 3-ft long modular design
• Optimized for flexible tool string configuration
• Collocation of sensors in flow line
Examples
29

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petrophysics Introduction.pptx

  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8. 0. 10. 20. 30. 0. 500. 1500. Time (hours) rates STB/D 0. 10. 20. 30. 4000. 4500. 5000. 5500. 6000. pressure PSI 102/01/01-1200 : N/A (2000 STB/D, 24 hrs) (5500 psi)
  • 9. 0. 10. 20. 30. 40. 0. 400. 800. Time (hours) rates STB/D 0. 10. 20. 30. 40. 5000. 5400. 5800. pressure PSI 102/01/02-0000 : N/A (1000 STB/D, 24 hrs) (shut in for 24 hrs) (5800 psi)
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22. Formation pressure nearly equals sandface pressure Kmc << Kf Ps Sandface Pressure Large pressure drop through mudcake Pmh • Permeable zones: low supercharge Pf  Ps SUPERCHARGE EFFECT
  • 23. • Tight zones: high supercharge Formation pressure much lower than sandface pressure Pf << Ps Small pressure drop through mudcake Pmh Kmc  Kf SUPERCHARGE EFFECT SUPERCHARGE EFFECT
  • 24.
  • 25. Fluid Identification (FLID) Section Density Resistivity Capacitance Pressure Fluid Temp 3 ft • Compact 3-ft long modular design • Optimized for flexible tool string configuration • Collocation of sensors in flow line
  • 27.
  • 28.
  • 29. 29