Experimental Study on Permeability Evolution in
Propped Shale Fracture

doi:10.11885/j.issn.1674-5086.2015.03.10.03

Abstract

Abstract:

In the process of shale gas fracturing exploitation，the permeability of propped shale fracture is one of the key
factors that affect the fracture conductivity. This work focuses on the effects of swelling and embedment on permeability in
propped shale using experimental method. The Pulse test method was used to measure the permeability of adsorbed gas and
non-adsorbed gas. The permeability of He，which is a non-adsorbing gas，in both granite and shale was measured for references.
The reduction of permeability in shale is caused by the existence of proppant embedment. The“U shape”feature is observed in
CO2 permeability curve，which indicates that the swelling also has a significant effect on the permeability in shale. Compared
with the permeability curve of He，the CO2 permeability is even lower and achieves the minimum value at the pressure condition
around the Langmuir pressure.

Key words: proppant embedment, adsorption and swelling, propped shale fracture, permeability evolution

Hou Lei1*, Derek Elsworth2, Sun Baojiang1, Wang Jintang1. Experimental Study on Permeability Evolution in
Propped Shale Fracture[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.10.03.

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