### Abstract

Fluid production from the nanopores of shale is elucidated by an analytical solution of the linearized compressible Navier-Stokes equations with no-slip condition for the pore-scale drainage flow from a small capillary in a matrix block to the surrounding fractures. The pore-scale drainage flow is driven by the volumetric expansion of the compressed fluid and it is always unsteady. It is shown that fluid is produced by the decay of a standing acoustic wave and the no-slip flow has a period-averaged mass flow rate (drainage rate) proportional to the square of the capillary radius which is two orders of magnitude higher than that from the Poiseuille's law. The drainage speed is found proportional to fluid's kinematic viscosity but independent of the capillary radius, allowing the fluid to escape to the fracture with a finite speed regardless how small the capillary is. This result represents a fundamental departure from the classical Poiseuille flow theory and it provides a unified mechanism on how shale fluid is produced.

Original language | English (US) |
---|---|

Pages (from-to) | 34-39 |

Number of pages | 6 |

Journal | Mechanics Research Communications |

Volume | 88 |

DOIs | |

State | Published - Mar 1 2018 |

### Fingerprint

### Keywords

- Compressible flow
- Fluid production
- Nanopores
- Navier-Stokes equations
- Shale gas

### ASJC Scopus subject areas

- Civil and Structural Engineering
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering

### Cite this

**Mechanism of fluid production from the nanopores of shale.** / Chen, Kangping; Shen, Di.

Research output: Contribution to journal › Article

*Mechanics Research Communications*, vol. 88, pp. 34-39. https://doi.org/10.1016/j.mechrescom.2018.01.009

}

TY - JOUR

T1 - Mechanism of fluid production from the nanopores of shale

AU - Chen, Kangping

AU - Shen, Di

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Fluid production from the nanopores of shale is elucidated by an analytical solution of the linearized compressible Navier-Stokes equations with no-slip condition for the pore-scale drainage flow from a small capillary in a matrix block to the surrounding fractures. The pore-scale drainage flow is driven by the volumetric expansion of the compressed fluid and it is always unsteady. It is shown that fluid is produced by the decay of a standing acoustic wave and the no-slip flow has a period-averaged mass flow rate (drainage rate) proportional to the square of the capillary radius which is two orders of magnitude higher than that from the Poiseuille's law. The drainage speed is found proportional to fluid's kinematic viscosity but independent of the capillary radius, allowing the fluid to escape to the fracture with a finite speed regardless how small the capillary is. This result represents a fundamental departure from the classical Poiseuille flow theory and it provides a unified mechanism on how shale fluid is produced.

AB - Fluid production from the nanopores of shale is elucidated by an analytical solution of the linearized compressible Navier-Stokes equations with no-slip condition for the pore-scale drainage flow from a small capillary in a matrix block to the surrounding fractures. The pore-scale drainage flow is driven by the volumetric expansion of the compressed fluid and it is always unsteady. It is shown that fluid is produced by the decay of a standing acoustic wave and the no-slip flow has a period-averaged mass flow rate (drainage rate) proportional to the square of the capillary radius which is two orders of magnitude higher than that from the Poiseuille's law. The drainage speed is found proportional to fluid's kinematic viscosity but independent of the capillary radius, allowing the fluid to escape to the fracture with a finite speed regardless how small the capillary is. This result represents a fundamental departure from the classical Poiseuille flow theory and it provides a unified mechanism on how shale fluid is produced.

KW - Compressible flow

KW - Fluid production

KW - Nanopores

KW - Navier-Stokes equations

KW - Shale gas

UR - http://www.scopus.com/inward/record.url?scp=85041517026&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85041517026&partnerID=8YFLogxK

U2 - 10.1016/j.mechrescom.2018.01.009

DO - 10.1016/j.mechrescom.2018.01.009

M3 - Article

AN - SCOPUS:85041517026

VL - 88

SP - 34

EP - 39

JO - Mechanics Research Communications

JF - Mechanics Research Communications

SN - 0093-6413

ER -