Diffusion Seepage Model for Fractured Horizontal Well
in Shale Gas Reservoir

doi:10.11885/j.issn.1674-5086.2014.11.19.01

Abstract

Abstract:

To determine the effect of gas diffusion affection in the shale gas reservoirs with the desorption-adsorption and
nano-scale pore on fractured horizontal well productivity analysis，we established the seepage mathematic model and analyzed
quantitatively the production. In the study，we used the three linear seepage mechanism，Knudsen diffusion mechanism and
diffusion of the added value of permeability formula to draw the relation chart of Knudsen number under different pore diameters
with reservoir pressure，and derived the single well productivity equation to be used for the actual production prediction.
Analysis of the diffusion of shale gas reservoir was carried out in 3 aspects，which are the pore size，reservoir pressure and gas
reservoir depth，and reference is given to consider the diffusion of various indicators. Results show that under the condition of
the reservoir pressure，the smaller the porosity of the reservoir，the greater the influence of diffusion effect is on capacity；and
for large pore reservoir，when the bottom hole pressure is lower than the threshold of the calculated in the model，the diffusion
effect should not be ignored.

Key words: shale gas reservoir, diffusion, porous flow, horizontal well production capacity, Knudsen coefficient

Guo Xiaozhe1*, Zhou Changsha2. Diffusion Seepage Model for Fractured Horizontal Well
in Shale Gas Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.11.19.01.

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