A Practical Simulation Method Capturing Complex Hydraulic-Fracturing Physics

Topics: Hydraulic fracturing Shale oil Tight gas/shale gas/coalbed methane
Fig. 1: Work flow for unconventional-reservoir characterization.

To understand production from shale reservoirs, the role of hydraulically induced fractures, natural fractures, and their interaction in a formation must be captured. Implementation of such approaches is data-intensive and is accurate only when the field is fully characterized. A model has been developed in which fractures are discretized explicitly and flow is coupled by use of simplified mechanics. It can be considered as an intermediate method between a fully developed discrete-fracture-network (DFN) model and simplified hydraulic-fracturing models

Introduction

The current view is that many unconventional reservoirs comprise well-­developed natural-fracture networks with multiple orientations within which complex hydraulic-fracture patterns develop, as suggested by microseismic data. The unconventional-reservoir modeling process follows a multidisciplinary integrated approach that includes specific aspects of geophysics, geology, laboratory work, and reservoir engineering. To understand the shale-­deformation processes, the flow should be coupled with mechanics, yet the complexity of the involved mechanisms governing stimulation modeling precludes very fast simulations.

Characterizing all parameters is a challenge because of the uncertainty of ­natural-fracture distribution, potential local stress changes, and the lack of reservoir description in three dimensions. The best practice able to capture the most-important phenomena, integrating while being accurately predictive, is not yet defined.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 172831, “Forecasting Production in Shale and Tight Reservoirs: A Practical Simulation Method Capturing the Complex Hydraulic-Fracturing Physics,” by Axelle Baroni, Matthieu Delorme, and Nina Khvoenkova, IFP Energies nouvelles, prepared for the 2015 SPE Middle East Oil and Gas Show and Conference, Manama, Bahrain, 8–11 March. The paper has not been peer reviewed.
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A Practical Simulation Method Capturing Complex Hydraulic-Fracturing Physics

20 September 2015

Volume: 67 | Issue: 10