Evolution Mechanism of Shale Gas Reservoirs Permeability under  Thermal-Fluid-Solid Coupling

ZHANG Hongxue; LIU Weiqun

doi:10.11858/gywlxb.20230615

Volume 37 Issue 3

Jun 2023

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Chinese Journal of High Pressure Physics > 2023 > 37(3): 035303.

ZHANG Hongxue, LIU Weiqun. Evolution Mechanism of Shale Gas Reservoirs Permeability under Thermal-Fluid-Solid Coupling[J]. Chinese Journal of High Pressure Physics, 2023, 37(3): 035303. doi: 10.11858/gywlxb.20230615

Citation:

ZHANG Hongxue, LIU Weiqun. Evolution Mechanism of Shale Gas Reservoirs Permeability under Thermal-Fluid-Solid Coupling[J]. Chinese Journal of High Pressure Physics, 2023, 37(3): 035303. doi: 10.11858/gywlxb.20230615

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Evolution Mechanism of Shale Gas Reservoirs Permeability under Thermal-Fluid-Solid Coupling

doi: 10.11858/gywlxb.20230615

ZHANG Hongxue^1
,,
LIU Weiqun^{2, 3}

1.
School of Mechanics and Optoelectronic Physics, Anhui University of Science & Technology, Huainan 232001, Anhui, China
2.
School of Mechanics and Civil Engineering, China University of Mining and Technology,Xuzhou 221116, Jiangsu, China
3.
State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

Received Date: 14 Feb 2023
Rev Recd Date: 03 Mar 2023
Accepted Date: 28 Mar 2023
Issue Publish Date: 05 Jun 2023

Abstract

Abstract

In order to study the evolution mechanism of shale permeability under thermal-fluid-solid coupling, the effective stress-permeability model of shale is developed considering the impact of thermal desorption and effective stress and thermal expansion on shale permeability. The proposed model is capable of revealing the influence mechanism of sorption strain and thermal expansion strain on shale permeability. Based on the model and the elastic theory of porous media, the thermal induced desorption permeability model of shale gas reservoirs under uniaxial strain condition was established. The model can discuss the evolution mechanism of shale permeability with temperature and pore pressure. The validity and accuracy of the model was verified against the laboratory measurements of shale core permeability. The following results were obtained: (1) The thermal induced desorption permeability model can fit the permeability of Marcellus shale under constant pressure and variable temperature. (2) The evolution mechanism of shale permeability with pore pressure under constant temperature is explored. The evolution law of permeability under constant temperature is U-shaped. The rebound of permeability with pore pressure decrease is less obvious with the increase of temperature. (3) The evolution mechanism of shale permeability with temperature under constant pressure condition is analyzed. The evolution law of permeability with temperature under constant pressure condition presents an inverted “U” shape. The influence of temperature on permeability is less with the increase of pore pressure. (4) The sensitivity analysis of thermal desorption permeability model under constant temperature and pressure was carried out. The larger the Poisson’s ratio is, the larger the permeability ratio gradient is. The larger the pore volume modulus, the smaller the permeability ratio gradient. At constant pore pressure, when the linear expansion coefficient is larger than the critical value or the Langmuir bulk strain is smaller than the critical value, the permeability evolution does not show an inverted “U” shape. At constant temperature, when Langmuir strain is less than critical value, permeability evolution does not show “U” shape.
- thermal-fluid-solid coupling,
- shale permeability,
- thermally induced desorption,
- effective stress,
- sorption strain

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References

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Evolution Mechanism of Shale Gas Reservoirs Permeability under Thermal-Fluid-Solid Coupling

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