A modified pulse‐decay approach to simultaneously measure permeability and porosity of tight rocks

Wang, Yue; Nolte, Steffen; Tian, Zhiguo; Amann-Hildenbrand, Alexandra; Krooß, Bernhard M.; Wang, Moran

doi:10.1002/ese3.989

Cited by 7 publications

(2 citation statements)

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“…The numerical method provided in the Appendix A is used to simulate the pulse decay testing by varying the permeability ratio, number of layers, thickness ratio of different layers, and storativity ratio. The numerical simulation method has been adopted by other researchers to study the characteristics of pulse decay testing and has been validated by experimental results [3,5,10]. The main factor that brings error to the simulation results is the mesh size.…”

Section: Definitions and Simulation Methodsmentioning

confidence: 99%

“…The permeability is obtained by analyzing the slope of the semi-logarithmic logarithmic straight line of the pressure difference between the upstream and down in the later stage. Recently, Wang et al [10] proposed an analysis method using the cept of this straight line. The early and late asymptotic solutions of pulse decay test the main tools for the permeability analysis, and there have been continuous im ments [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Simulation Analysis of the Characteristics of Layered Cores during Pulse Decay Tests

Chen,

Liu,

Cheng

et al. 2024

Processes

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The permeability of low-permeability cores is generally measured using a pulse decay method. The core of low-permeability rocks, such as shale, often has a layered structure. The applicability of pulse decay testing for layered cores is not clear. In this study, the performance of the pulse decay method on layered cores was comprehensively investigated. Numerical simulations were conducted to investigate the influence of the interlayer permeability ratio, storativity ratio, layer thickness, interlayer location, and number of layers on the pulse decay pressure and pressure derivative curves, as well as the permeability obtained from pulse decay testing. The results revealed that the pressure curves of layered cores exhibit distinct differences from those of homogeneous cores if the upstream permeability is larger than the downstream one. The pressure derivative curve shows more inclined or horizontal straight-line segments than in the homogeneous case. The shapes of the pressure and pressure derivative curves are affected by the upstream and downstream positions of the core, but the tested permeability is not affected. The tested permeability differs from the equivalent model permeability, with an error of up to 22%. If the number of layers is not less than 10, the permeability obtained from the pulse decay test is consistent with that of the equivalent model. These differences are influenced by the interlayer permeability ratio, storativity ratio, layer thickness, interlayer location, and number of layers. To improve the accuracy of permeability analysis in pulse decay testing for layered cores, curve fitting using the characteristics of the pressure derivative curve can be employed.

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Section: Definitions and Simulation Methodsmentioning

confidence: 99%