Abstract
The pulse-decay method is believed to be more suitable than the steady-state method for permeability measurements on tight porous media because it records pressure variations instead of flow rates and does not require the establishment of a steady state. Most of the previous analytical solutions for the pulse-decay process are based on a linearized governing equation, which may be inapplicable to measurements with large differential pressures. In this study, a nonlinear governing equation is derived through mass conservation and Darcy’s law. For rigid porous media such as the sedimentary rock samples, by comparing the magnitude of the pressure sensitivity of the physical properties for both the testing gas and the core sample, we found that only the gas compressibility and the apparent permeability have to be regarded as pressure-dependent, while the others can be regarded as constant. The perturbation method and the eigenfunction expansion method are combined to derive the general solution of the nonlinear governing equation. The results show that in the plot of logarithmic differential pressure versus time, a straight line can be obtained at the late-time stage and its slope value can be used to evaluate the apparent permeability. We further estimate the error in permeability evaluation, induced by selecting mean pore pressure as the characteristic pressure. The theoretical analysis has been verified by both numerical simulation and experimental measurements.
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Abbreviations
- \(A\) :
-
Cross-sectional area of cylindrical core sample, m2
- \(L\) :
-
Length of cylindrical core sample, m
- \(P\) :
-
Pore pressure, Pa
- \(P_{D}\) :
-
Dimensionless pore pressure
- \(P_{D}^{\left( i \right)}\) :
-
The ith term in the asymptotic series
- \(P_{D} \left( \infty \right)\) :
-
Dimensionless equilibrium pore pressure
- \(P_{c}\) :
-
Confining pressure, Pa
- \(P_{{{\text{char}}}}\) :
-
Characteristic pressure, Pa
- \(P_{d} \left( 0 \right)\) :
-
Initial downstream pressure, Pa
- \(P_{{{\text{eq}}}}\) :
-
Equilibrium pore pressure, Pa
- \(P_{{{\text{mean}}}}\) :
-
Mean pore pressure, Pa
- \(P_{u} \left( 0 \right)\) :
-
Initial upstream pressure, Pa
- \(T\) :
-
Temperature, K
- \(V_{u}\) :
-
Volume of upstream reservoir, m3
- \(V_{d}\) :
-
Volume of downstream reservoir, m3
- \(Z\) :
-
Gas compressibility factor
- \(a\) :
-
Volume ratio of sample’s pore space to upstream reservoir
- \(b\) :
-
Volume ratio of sample’s pore space to downstream reservoir
- \(b_{s}\) :
-
Klinkenberg slippage factor, Pa
- \(f\) :
-
Intercept in plot of dimensionless differential pressure versus time
- \(k_{{{\text{app}}}}\) :
-
Apparent permeability, m2
- \(k_{{{\text{error}}}}\) :
-
Permeability coefficient evaluated with mean pore pressure as characteristic pressure, m2
- \(k_{{{\text{int}}}}\) :
-
Intrinsic permeability, m2
- \(k_{{{\text{real}}}}\) :
-
Permeability coefficient evaluated with equilibrium pore pressure as characteristic pressure, m2
- \(t\) :
-
Time, s
- \(t_{D}\) :
-
Dimensionless time
- \(v\) :
-
Flow rate, m·s-1
- \(w\) :
-
Weight coefficient to determine characteristic pressure
- \(x\) :
-
Displacement, m
- \(x_{D}\) :
-
Dimensionless displacement
- \({\varGamma}\) :
-
Dimensionless duration of a pulse-decay test
- \({\Delta }P_{D}\) :
-
Dimensionless differential pressure
- \(\alpha\) :
-
Slope in plot of dimensionless differential pressure versus time
- \(\beta_{Z}\) :
-
Pressure sensitivity of gas compressibility factor, Pa−1
- \(\beta_{{b_{s}}}\) :
-
Pressure sensitivity of slippage factor, Pa−1
- \(\beta_{{k_{{{\text{app}}}} }}\) :
-
Pressure sensitivity of apparent permeability, Pa−1
- \(\beta_{{k_{{{\text{int}}}} }}\) :
-
Pressure sensitivity of intrinsic permeability, Pa−1
- \(\beta_{\mu }\) :
-
Pressure sensitivity of viscosity, Pa−1
- \(\beta_{\rho }\) :
-
Gas compressibility, Pa−1
- \(\beta_{\phi }\) :
-
Pressure sensitivity of porosity, Pa−1
- \(\delta\) :
-
Relative error induced by misusing of characteristic pressure
- \(\varepsilon\) :
-
Strength of nonlinearity
- \(\theta_{i}\) :
-
The ith positive solution to Eq. (37)
- \(\rho\) :
-
Gas density, kg·m−3
- \(\mu\) :
-
Dynamic viscosity of testing gas, Pa·s
- \(\phi\) :
-
Porosity of core sample
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Acknowledgements
This work was financially supported by NSFC grants (No. U1837602, 11761131012) and the DFG grant AM 423/1-1 (Project number: 392108477; Joint Sino-German Research Project: “NanGasPor”).
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Wang, Y., Tian, Z., Nolte, S. et al. Influence of Equation Nonlinearity on Pulse-Decay Permeability Measurements of Tight Porous Media. Transp Porous Med 148, 291–315 (2023). https://doi.org/10.1007/s11242-023-01939-z
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DOI: https://doi.org/10.1007/s11242-023-01939-z