Fracture Propagation Driven by Fluid Outflow from a Low-permeability Reservoir

Details Fracture Propagation Driven by Fluid Outflow from a Low-permeability Reservoir Fracture Propagation Driven by Fluid Outflow from a Low-permeability Reservoir

2012-03-20

arxiv.org/abs/1203.4543v2

Physics

Geophysics

Scientific paper

Fracturing of the caprock during CO2 storage in deep saline aquifers can lead to leakage. Estimation of the rate of fracture propagation allows one to assess the leakage risk. Here we propose an analytical model for calculating the length of the fracture, which propagates due to the fluid outflow from a low-permeability aquifer. We present a self-similar solution of the pressure diffusion equation in the system of reservoir and fracture, allowing us to get the analytical expression for the fracture length as a function of time. We calculate the evolution of the fracture length for a characteristic aquifer. We show that the analytical solution provides an estimate from below for the fracture length, since the driving force for the fracture propagation grows with elevation.

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