Method for predicting well reliability by computer simulation

Details Method for predicting well reliability by computer simulation Method for predicting well reliability by computer simulation

E - Fixed Constructions

21

B

E21B 49/00 (2006.01) G06F 17/10 (2006.01) G06F 19/00 (2011.01) G06T 17/20 (2006.01)

Patent

CA 2690992

Methods of predicting earth stresses in response to pore pressure changes in a hydrocarbon-bearing reservoir within a geomechanical system, include establishing physical boundaries for the geomechanical system and acquiring reservoir characteristics. Geomechanical simulations simulate the effects of changes in reservoir characteristics on stress in rock formations within the physical boundaries to determine the rock formation strength at selected nodes in the reservoir. The strength of the rock formations at the nodes is represented by an effective strain (.epsilon. eff), which includes a compaction strain (.epsilon. c) and out-of-plane shear strains (~ 1- 3, Y2-3) at a nodal point. The methods further include determining an effective strain criteria (.epsilon. eff cr) from a history of well failures in the physical boundaries. The effective strain (.epsilon. eff cr) at a selected nodal point is compared with the effective strain criteria (.epsilon. eff cr) to determine if the effective strain (.epsilon. eff) exceeds the effective strain criteria (.epsilon. eff cr).

L'invention concerne un procédé de prédiction de contraintes terrestres sur la base de changements de la pression de pores dans un réservoir contenant des hydrocarbures à l'intérieur d'un système géomécanique. Le procédé comprend l'établissement de limites physiques pour le système et l'acquisition de caractéristiques de réservoir. Des simulations géomécaniques sont utilisées pour simuler les effets de changements de caractéristiques de réservoir sur la réistance des formations rocheuses au niveau de nuds sélectionnés dans le réservoir. La résistance des formations rocheuses au niveau des noeuds est représentée par une contrainte efficace (eeff) comprenant une contrainte de compactage (ec) et des contraintes de cisaillement hors du plan (?1-3, Y2-3) au niveau d'un point nodal. Les procédés comprennent également la détermination d'un critère de contrainte efficace (eeffcr) à partir d'un historique de défaillances de puits dans les limites physiques. La contrainte efficace (eeffcr) au niveau d'un point nodal sélectionné est comparée au critère de contrainte efficace (eeffcr) pour déterminer si la contrainte efficace (eeff) dépasse le critère de contrainte efficace (eeffcr).

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