Coupled wellbore erosion and stability analysis

Stavropoulou, M; Papanastasiou, P; Vardoulakis, I

dc.contributor.author	Stavropoulou, M	en
dc.contributor.author	Papanastasiou, P	en
dc.contributor.author	Vardoulakis, I	en
dc.date.accessioned	2014-03-01T01:13:39Z
dc.date.available	2014-03-01T01:13:39Z
dc.date.issued	1998	en
dc.identifier.issn	0363-9061	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12635
dc.subject	wellbore stability	en
dc.subject	sand erosion	en
dc.subject	sand production	en
dc.subject	sand prediction	en
dc.subject	radial flow	en
dc.subject	poroelasticity	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Mechanics	en
dc.subject.other	Elasticity	en
dc.subject.other	Erosion	en
dc.subject.other	Finite element method	en
dc.subject.other	Galerkin methods	en
dc.subject.other	Mathematical models	en
dc.subject.other	Mechanical permeability	en
dc.subject.other	Porosity	en
dc.subject.other	Radial flow	en
dc.subject.other	Stabilization	en
dc.subject.other	Poroelasticity	en
dc.subject.other	Sand erosion	en
dc.subject.other	Sand prediction	en
dc.subject.other	Sand production	en
dc.subject.other	Wellbore stability	en
dc.subject.other	Sand	en
dc.subject.other	erosion	en
dc.subject.other	hydrocarbon technology	en
dc.subject.other	sand	en
dc.title	Coupled wellbore erosion and stability analysis	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/(SICI)1096-9853(199809)22:9<749::AID-NAG944>3.0.CO;2-K	en
heal.identifier.secondary	http://dx.doi.org/10.1002/(SICI)1096-9853(199809)22:9<749::AID-NAG944>3.0.CO;2-K	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	This paper extends earlier work on sand erosion and presents an attempt to couple sand erosion to mechanical damage of rock around a wellbore. Porosity which evolves in time and space as surface erosion progresses, is chosen as the coupling parameter. Both rock elasticity and strength (cohesion) are assumed to depend on porosity in such a way that the material becomes weaker with increasing porosity. The mathematical model, consists of erosion equations, mixture flow equations and stress equilibrium equations, is solved numerically by Galerkin finite element method. Numerical results suggest that erosion, resulting in sand production, is high close to the free surface. Erosion is accompanied by changes in porosity and a significant permeability increase. Erosion in the vicinity of the wellbore induces alterations in the mechanical behaviour of the medium. Weakening of rock stiffness leads to severe alteration of both effective stresses and pore pressure near the cavity. Since cohesion decreases with increasing porosity, one can also identify the time instant at which rock mechanical failure starts.This paper extends earlier work on sand erosion and presents an attempt couple sand erosion to mechanical damage of rock around a wellbore. Porosity which evolves m time and space as surface erosion progresses, is chosen as the coupling parameter. Both rock elasticity and strength (cohesion) are assumed to depend on porosity in such a way that the material becomes weaker with increasing porosity. The mathematical model, consists of erosion equations, mixture flow equations and stress equilibrium equations, is solved numerically by Galerkin finite element method. Numerical results suggest that erosion, resulting in sand production, is high close to the free surface. Erosion is accompanied by changes in porosity and a significant permeability increase. Erosion in the vicinity of the wellbore induces alterations in the mechanical behaviour of the medium. Weakening of rock stiffness leads to severe alteration of both effective stresses and pore pressure near the cavity. Since cohesion decreases with increasing porosity, one can also identify the time instant at which rock mechanical failure starts.	en
heal.publisher	John Wiley & Sons Ltd, Chichester, United Kingdom	en
heal.journalName	International Journal for Numerical and Analytical Methods in Geomechanics	en
dc.identifier.doi	10.1002/(SICI)1096-9853(199809)22:9<749::AID-NAG944>3.0.CO;2-K	en
dc.identifier.isi	ISI:000075888600003	en
dc.identifier.volume	22	en
dc.identifier.issue	9	en
dc.identifier.spage	749	en
dc.identifier.epage	769	en