Insights on the gas permeability change in porous shale
Journal Title: Advances in Geo-Energy Research - Year 2017, Vol 1, Issue 2
Abstract
Due to abundant nanoscale pores developed in shale, gas flow in shale presents a complex dynamic process. This paper summarized the effects from effective stress increase, shale matrix shrinkage, gas slippage and Knudsen diffusion on the gas permeability change in shale during shale gas recovery. With the reduce in gas pressure, effective stress increase leads to the decline of the permeability in an exponential form; the permeability increases due to the shale matrix shrinkage induced by gas desorption; appearances of gas slippage and Knudsen diffusion cause an additional increase in the gas permeability particularly in small pores at low pressures. In addition, some reported models evaluating the shale permeability were reviewed preliminarily. Models considering these four effects may be potentially effective to evaluate the gas permeability change in shale.
Authors and Affiliations
Junqian Li, Tao Yu, Xu Liang, Pengfei Zhang, Chen Chen, Jie Zhang
Keywords
Related Articles
- EP ID EP415870
- DOI 10.26804/ager.2017.02.01
- Views 120
- Downloads 0
Experimental study on evolution behaviors of triaxial-shearing parameters for hydrate-bearing intermediate fine sediment
Evolution behaviors of triaxial shearing parameters are very important for geo-technical response analysis during the process of extracting natural gas from hydrate-bearing reservoirs. In order to explore the effects of...
Applications of digital core analysis and hydraulic flow units in petrophysical characterization
Conventional petrophysical characterizations are often based on direct laboratory measurements. Although they provide accurate results, such measurements are time-consuming and limited by instrument and environment. What...
Study on facies-controlled model of a reservoir in Xijiang 24-3 oilfield in the Northern Pearl River Mouth Basin
To better understand the internal structure of the Xijiang 24-3 Oilfield in the Northern Pearl River Mouth Basin, a reasonable and effective three-dimensional quantitative geological model is needed to characterize the d...
Nonlinear flow in low permeability reservoirs: Modelling and experimental verification
The low-permeability reservoirs are of heavy heterogeneity, low permeability, fine oil-water passages, strong resistance during flow, and the significant interaction between solid and liquid interfaces causes the flow of...
Controlling factors and physical property cutoffs of the tight reservoir in the Liuhe Basin
Tight gas sandstone reservoirs of the Lower Cretaceous Xiahuapidianzi Formation are the main exploration target in the Liuhe Basin in China. Petrology characteristics, reservoir space (pore space), controlling factors an...