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- Title
A tri-linear model for production prediction in retrograde shale gas reservoirs.
- Authors
Wu Yong-hui; Cheng Lin-song; Huang Shi-jun; Bai Yu-hu; Xu Bing-xiang; Ding Guan-yang
- Abstract
In this paper, a tri-linear model is used to make production forecasts for retrograde shale gas wells after hydraulic fracturing. Gas desorption, phase behavior and relative permeability of oil and gas are incoporated in it. Because of nonlinearity of mathematical model, pressure relative parameters are handled implicitly with pseudo-pressure and saturation relative parameters are handled explicitly. A flowing material balance method is proposed in this paper to obtain a semi-analytical solution of the model. By comparing the semi-analytical solution to the solution of commercial numerical simulator and field production data from a retrograde shale gas well located in Eagle Ford play, the accuracy and practicability of the proposed semi-analytical method is validated. The results show that the mathematical model can be linearized with the semi-analytical model. Under the same condition, the flow ability of retrograde shale gas is weaker than that of single-phase, fracturing stages should be more; the fracture length reflects the stimulated reservoir volume, increasing fracture length can improve the reserves of the well; secondary fracture density and permeability have a large effect on production, it is necessary to increase the complexity and conductivity of the stimulated reservoir.
- Subjects
NATURAL gas production; SHALE gas reservoirs; GAS absorption &; adsorption; ANALYTICAL solutions; HYDRAULIC fracturing; LINEAR statistical models
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 11, p1
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.09.009