High-resolution numerical simulations of capillary trapping of carbon dioxide in fractured formations

Robert Annewandter, I. Main, Sebastian Geiger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

CO2 injection is one of the most common forms of enhanced oil recovery. It also allows us to sequester greenhouse gases in the subsurface. CO2 injection is currently considered for many clastic and carbonate reservoirs. The latter reservoirs often contain fractures, therefore quantification of sweep efficiency and CO2 trapping in fractured formations is of critical importance to design appropriate CO2 injection schemes for carbonate reservoirs.

Discrete fracture and matrix (DFM) simulations have emerged as a powerful technology to analyse the fundamental flow and transport properties in naturally fractured reservoirs and bridge gaps between geosciences and reservoir engineering: they help to validate upscaling workflows, improve the analysis of pressure transients from well-tests, and allow to explore how uncertainties in fracture network properties impact hydrocarbon recovery. The key difference between DFM simulations and traditional dual-porosity approaches is that the structurally complex fracture geometries are explicitly discretised as 2D surfaces in a 3D reservoir model, which hence comprises a geologically realistic representation of the fracture patterns and rock matrix.

Here we extend the DFM simulation workflow to account for capillary trapping of CO2 in fractured media. Fluid flow is described by a fully compositional model including an equation of state for CO2-H2O-NaCl fluids. The governing equations are discretised in space using unstructured and mixed-dimensional finite element - finite volume techniques. We demonstrate how our new DFM approach can be applied to simulate CO2 injection and trapping of CO2 in fractured geological formations with geologically realistic fracture networks. We show how matrix diffusion and capillary forces influence the rate at which CO2 is trapped in the rock matrix and discuss how this trapping could be modelled more accurately in conventional reservoir simulators.
Original languageEnglish
Title of host publicationSPE Reservoir Characterisation and Simulation Conference and Exhibition (RCSC 2013)
Subtitle of host publicationNew approaches in characterisation and modelling of complex reservoirs
Place of PublicationRichardson, Texas
PublisherSociety of Petroleum Engineers
Pages647-667
Number of pages21
ISBN (Electronic)9781613992685
ISBN (Print)9781629931449
DOIs
Publication statusPublished - 2013
EventSPE Reservoir Characterisation and Simulation Conference and Exhibition 2013 - Abu Dhabi, United Arab Emirates
Duration: 16 Sep 201318 Sep 2013

Conference

ConferenceSPE Reservoir Characterisation and Simulation Conference and Exhibition 2013
Abbreviated titleRCSC 2013
CountryUnited Arab Emirates
CityAbu Dhabi
Period16/09/1318/09/13

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  • Cite this

    Annewandter, R., Main, I., & Geiger, S. (2013). High-resolution numerical simulations of capillary trapping of carbon dioxide in fractured formations. In SPE Reservoir Characterisation and Simulation Conference and Exhibition (RCSC 2013): New approaches in characterisation and modelling of complex reservoirs (pp. 647-667). Society of Petroleum Engineers. https://doi.org/10.2118/166002-MS