Second-Order Gas-Permeability Correlation of Shale During Slip Flow
- Cong Niu (University of Science and Technology of China) | You-zhi Hao (University of Science and Technologies of China) | Daolun Li (University of Science and Technologies of China) | Detang Lu (University of Science and Technologies of China)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- October 2014
- Document Type
- Journal Paper
- 786 - 792
- 2014.Society of Petroleum Engineers
- 5.1.1 Exploration, Development, Structural Geology, 5.3.4 Integration of geomechanics in models, 1.10 Drilling Equipment
- Molecule Accumulation, Apparent permeability, Slip Flow Regime, Second-order slip boundary
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- 649 since 2007
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Recent molecular-dynamics (MD) simulation of methane flow through nanoscale kaolinite channel shows that the gas molecules accumulate near the kaolinite wall, which will reduce the flowpath of the gas through tight porous media. Considering this gas-accumulation effect, and on the basis of the corrected second-order slip boundary condition (BC) proposed by Zhang et al. (2010), a permeability-correlation model is proposed for nanoscale flow in highly compacted shale reservoirs. Full-derivation detail of this model is presented along with a comparison with several existing correlations. Results show that, with the increase of the Knudsen number (Kn), the molecular-accumulation effect has an obvious negative effect on the shale permeability, which should not be neglected in further investigation. The parametric investigation of the model proposed shows that the permeability is mostly decided by the pore-wall structure of shale matrix and only slightly influenced by the gas property.
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