Quantitative production analysis and EUR prediction from unconventional reservoirs using a data-driven drainage volume formulation

2018 European Association of Geoscientists and Engineers EAGE. All rights reserved. 1. We developed a general analytic solution for bounded transient flow based upon an asymptotic pressure approximation which reduces to Fetkovich's work on bounded radial flow and Wattenbarger's work on bounded linear flow in those specific geometries. The methodology offers similar abilities for analysis without the restriction to specific flow regimes. 2. We illustrate how to use the asymptotic solution for EUR estimation. Our approach works for infinite acting transient flow and through the transition to boundary dominated flow. It is validated by synthetic models and conventional simulation. 3. We illustrated the improved methods for both drainage volume calculation as well as w() inversion which shows more detailed features. The drainage volume calculation is no longer based on global curve fitting. The proposed approach improves numerical inversion for w(). 4. We improved quantitative interpretation from production data. The interpretation of matrix permeability is based on fracture cluster interference seen in the w() high resolution diagnostic plot and is validated by buildup analysis. EUR is also predicted.

Quantitative production analysis and EUR prediction from unconventional reservoirs using a data-driven drainage volume formulation Academic Article