Modelling mechanical behaviour of limestone under reservoir conditions |
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Authors: | Lú cia Carvalho Coelho,Antonio Claudio Soares,Nelson Francisco F. Ebecken,Jos Luis Drummond Alves,Luiz Landau |
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Affiliation: | Lúcia Carvalho Coelho,Antonio Claudio Soares,Nelson Francisco F. Ebecken,José Luis Drummond Alves,Luiz Landau |
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Abstract: | High porosity and low permeability limestone has presented pore collapse. As fluid is withdrawn from these reservoirs, the effective stresses acting on the rock increase. If the strength of the rock is overcome, pore collapse may occur, leading to irreversible compaction of porous media with permeability and porosity reduction. It impacts on fluid withdrawal. Most of reservoirs have been discovered in weak formations, which are susceptible to this phenomenon. This work presents a study on the mechanical behaviour of a porous limestone from a reservoir located in Campos Basin, offshore Brazil. An experimental program was undergone in order to define its elastic plastic behaviour. The tests reproduced the loading path conditions expected in a reservoir under production. Parameters of the cap model were fitted to these tests and numerical simulations were run. The numerical simulations presented a good agreement with the experimental tests. Copyright © 2006 John Wiley & Sons, Ltd. |
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Keywords: | pore collapse plasticity stress paths cap models reservoir geomechanics |
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