The deviation of gas permeability and classical theory in tight reservoir cores with high pressure

An, Weiqing; Yue, Xiang-an; Feng, Xiaoxu; Fang, Xin

doi:10.1016/j.jngse.2016.02.031

Cited by 3 publications

(3 citation statements)

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“…Our group [54,56] found that the traditional back-pressure regulator is not suitable for measuring the extremely low flowrate at high pressure due to its working principle. In this experiment, the self-designed back-pressure regulator was used to limit the pressure fluctuation of the whole experimental facility below 0.002 MPa under the pressure of 40 MPa for 120 minutes.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…The study of gas permeability under high pressure in reservoirs is done in order to analyze the flow characteristics of gas in the core at very low flowrate and high average pressures. However, the backpressure regulator method is not suitable for the permeability experiment of tight cores at high pressure due to the working principle of the backpressure regulator [54].…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results showed that the measured gas permeability at high pore pressure obviously deviates from the classical Klinkenberg slippage theory, which is much smaller than the predicted value. Due to the low gas flowrate through the tight core, the authors' group [54,56] used a cylinder to pressurize the back pressure and measured the permeability of these tight cores under the high back pressure. They found that the permeability under high backpressure was lower than the Klinkenberg permeability and the non-Klinkenberg flow pattern under high pressure.…”

Section: Introductionmentioning

confidence: 99%

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Applicability Analysis of Klinkenberg Slip Theory in the Measurement of Tight Core Permeability

Zou

Yue

et al. 2019

Energies

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The Klinkenberg slippage theory has widely been used to obtain gas permeability in low-permeability porous media. However, recent research shows that there is a deviation from the Klinkenberg slippage theory for tight reservoir cores under low-pressure conditions. In this research, a new experimental device was designed to carry out the steady-state gas permeability test with high pressure and low flowrate. The results show that, unlike regular low-permeability cores, the permeability of tight cores is not a constant value, but a variate related to a fluid-dynamic parameter (flowrate). Under high-pressure conditions, the relationship between flowrate and apparent permeability of cores with low permeability is consistent with Klinkenberg slippage theory, while the relationship between flowrate and apparent permeability of tight cores is contrary to Klinkenberg slip theory. The apparent permeability of tight core increases with increasing flowrate under high-pressure conditions, and it is significantly lower than the Klinkenberg permeability predicted by Klinkenberg slippage theory. The difference gets larger when the flowrate becomes lower (back pressure increases and pressure difference decreases). Therefore, the Klinkenberg permeability which is obtained by the Klinkenberg slippage theory by using low-pressure experimental data will cause significant overestimation of the actual gas seepage capacity in the tight reservoir. In order to evaluate the gas seepage capacity in a tight reservoir precisely, it is necessary to test the permeability of the tight cores directly at high pressure and low flowrate.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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