Study on the multi-scale nonlinear flow mechanism and model of shale gas

被引：0
|
作者：
Zhu W. [1 ]
Qi Q. [1 ]
机构：
[1] Institute of Applied Mechanics, University of Science and Technology Beijing, Beijing
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2016年 / 46卷 / 02期
关键词：
High velocity non-Darcy flow; Hydraulic fractured well; Production; Shale gas; Slip and diffusion;
D O I：
10.1360/N092016-00015
中图分类号：
学科分类号：
摘要：
Shale gas reservoirs have extremely complex structures with nano-pores and fractures. And the multiscale flowing states are also existed in it. The gas flowing characteristic is apparently different with normal gas reservoirs. In this paper, gas flow in porous media is was researched studied under different gas flowing state by the Knudsen number and the flowing mechanism, and the characteristics are explained. Then we build a unique general flowing shale gas model with multi-scale, by comprehensively considering Darcy flow, slip flow, diffusive flow and non-Darcy flow with high speed at the bottom hole, which are all the non-linear effects. A new shale gas model with combining original shale and fracturing areas is introduced to calculate the gas productivity by considering settled pressure conditions. The simulative results are calculated by the gas productivity functions and analyzed the sensitivity of parameters with the real productivity. The results show that shale gas productivity would increase by the increasing on the diffusion coefficient, parting coefficient and the radius of fractures, but the increasing rate would have the opposite effect. The productivity with considering non-Darcy effect was a little lower than the result without considering this effect. And the high speed non-Darcy had less effect on gas productivity when comparing with the slippage-diffusion. This model has offered a series of theories for forecasting and optimizing the productivity of shale gas with SRV. © 2016, Science Press. All right reserved.
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页码：111 / 119
页数：8
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