Investigating Multiphase Flow Phenomena in Fine-Grained Reservoir Rocks: Insights from Using Ethane Permeability Measurements over a Range of Pore Pressures

Figure 9

Examples of good quality ethane pulse decay pressure data for a high permeability sample from which accurate desorption rates could be calculated ((a) and (c)) and poor quality data for a low permeability sample from which accurate desorption rates could not be calculated ((b) and (d)). Temperature fluctuation over the duration of the measurement has a significant impact on mean pore pressure for the low permeability sample (d). Data collection for the low permeability sample was stopped at ~0.07 MPa differential pressure because of the excessive time required for full decay (b). Green lines in (a) and (b) indicate the difference between minimum mean pressure and final equilibrium pressure.

(a)

(b)

(c)

(d)