Fracture Permeability Enhancement During Fluid Injection Modulated by Pressurization Rate and Surface Asperities

Author:

Ji Yinlin1ORCID,Zhang Wei2,Hofmann Hannes13ORCID,Cappa Frédéric4ORCID,Zhang Supeng15ORCID

Affiliation:

1. Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences Potsdam Germany

2. School of Petroleum Engineering China University of Petroleum (East China) Qingdao China

3. Institute of Applied Geosciences Technische Universität Berlin Berlin Germany

4. Université Côte d’Azur CNRS Observatoire de la Côte d’Azur IRD Sophia Antipolis France

5. Key Laboratory of Shale Gas and Geoengineering Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Abstract

AbstractWe present a series of controlled fluid injection experiments in the laboratory on a pre‐stressed natural rough fracture with a high initial permeability (∼10−13 m2) in granite using different fluid pressurization rates. Our results show that fluid injection on a fracture with a slight velocity‐strengthening frictional behavior exhibits dilatant slow slip in association with a permeability increase up to ∼41 times attained at the maximum slip velocity of 0.085 mm/s for the highest‐rate injection case. Under these conditions, the slip velocity‐dependent change in hydraulic aperture is a dominant process to explain the transient evolution of fracture permeability, which is modulated by fluid pressurization rate and fracture surface asperities. This leads to the conclusion that permeability evolution can be engineered for subsurface geoenergy applications by controlling the fluid pressurization rate on slowly slipping fractures.

Funder

Helmholtz Association

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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