Precision Petrophysical Analysis Laboratory (PPAL)

Precision Petrophysical Analysis Laboratory

Schematic of PPAL

Capabilities

• Simulating reservoir conditions such as pore pressure, overburden pressure, and temperature.

• Simulating steady state gas flow through the core plug.

• Measuring permeability with accuracy of nano-darcy.

• Measuring pore volume(~0.1% accuracy for porosity)

• Instantaneous pressure recording with accuracy of 0.001 psi.

Core Holder Assembly and Core Plug Sample

Permeability Measurement

Flow Rate Measurement He - No Sorption

Flow Rate Measurement CO2 - Sorption

Permeability Measurements Marcellus Shale

Klinkenberg Correction

Pore Size Distribution Obtained Using Nitrogen Adsorption At 77ok

0.00E+00

2.00E-05

4.00E-05

6.00E-05

8.00E-05

1.00E-04

1.20E-04

1.40E-04

1.60E-04

1.80E-04

1 10 100 1000 10000

dV

p/d

Dp

Pore Diameter A°

The Average Pore Size is 3 Nanometer.

Normalized Permeability vs. Knudsen Number

Kn < 0.001 Continuum Flow

0.001< Kn

Double-slippage Correction

y = 8E+06x + 154.3 R² = 0.9603

y = 5E+06x + 155.51 R² = 0.9705

y = 2E+06x + 124.06 R² = 0.9731

y = 5E+06x + 122.83 R² = 0.9956

0

100

200

300

400

500

600

700

800

900

0 0.00005 0.0001 0.00015 0.0002 0.00025

Per

mea

bili

ty, n

D

Inverse Pressure Squared, Psia-2

Helium

Nitrogen

CO2-Adsorption

CO2-Desorption

Effect of Net Stress on the Porosity Measurements with N2

Effect of Net Stress on the Permeability Measured by N2 and CO2