Traditionally, formation damage has been associated with the presence of a flow reduction around the wellbore area due to drilling and completion operations; however factors such as variation in pore pressure can induce a response in the geomechanical behavior of the reservoir and thermodynamic behavior of fluid, which causes additional decrements on the flow capacity of the well drainage area. A procedure has been developed that determines the damage caused by changes in permeability due to variations in pressure. The procedure requires two parameters: the permeability modulus and the damaged caused by drilling and completion operations; these parameters are obtained using a coupled fluid-geomechanical simulator, the Numerical Transient Simulator (NTS), by the interpretation of a well transient analysis. The NTS was developed by the Applied Geomechanics Research Group (GIGA) of the Petroleum Engineering Program at the National University of Colombia – MedellÍn Campus. With the use of the NTS software it is possible to interpret a well test in a non-conventional way and then decompose the total skin into two components, one of them is the damage due to drilling and completion operations, and the other one is due to changes of permeability caused by pressure variations. The later component can be additionally decomposed into the geomechanical damage and thermodynamic damage as well. By disaggregating the formation damage, it is possible to know the factor that is having a major impact on the flow reduction. Therefore, the methodology presented in this paper can be used for the selection of the most appropriate well-stimulation procedure. This paper presents the theory and results of the application of this procedure for studying the damage in several wells of a field at the Colombian eastern foothill.
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ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014
September 9–13, 2014
Goiania, Brazil
Study of Formation Skin Caused by Changes in Pore Pressure Using a Coupled Simulator
Eduin Alexander López Patiño;
Eduin Alexander López Patiño
Universidad Nacional de Colombia
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Abel de Jesús Naranjo Agudelo;
Abel de Jesús Naranjo Agudelo
Universidad Nacional de Colombia
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Juan M. Mejía;
Juan M. Mejía
Universidad Nacional de Colombia
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Guillermo Arturo Álzate Espinosa
Guillermo Arturo Álzate Espinosa
Universidad Nacional de Colombia
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Paper presented at the ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014, Goiania, Brazil, September 2014.
Paper Number:
ISRM-SBMR-2014-041
Published:
September 09 2014
Citation
Patiño, Eduin Alexander López, Agudelo, Abel de Jesús Naranjo, Mejía, Juan M., and Guillermo Arturo Álzate Espinosa. "Study of Formation Skin Caused by Changes in Pore Pressure Using a Coupled Simulator." Paper presented at the ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014, Goiania, Brazil, September 2014.
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