Well simulation

Abstract

A method of computational fluid dynamic modelling of a subterranean region comprises: defining a computational domain by generating a geometrical model of a subterranean region comprising a wellbore and a surrounding formation; associating knowledge of a physical property of the subterranean region with a computational parameter; and inputting the computational parameter into the computational domain. In one embodiment knowledge of permeability within the subterranean region is defined as a viscous resistance within the computational domain.

1 - 64 . (canceled) 
     
     
         65 . A method of computational fluid dynamic modelling of a subterranean region comprising a wellbore and surrounding formation, the method comprising:
 providing a computational geometric model of the subterranean region, the computational geometric model comprising the wellbore and surrounding formation;   determining one or more zones in the formation of the computational geometric model;   determining one or more voids in the surrounding formation, the voids being representative of perforation or fractures in the formation, and   associating a viscous resistance with one or more of the determined zones as a computational parameter as well as associating a viscous resistance with one or more of the determined voids as a computational parameter; and   computationally modelling, using a computer, fluid flow through the one or more determined zones, through the one or more voids and through the wellbore using the associated viscous resistance of the one or more determined zones and one or more voids.   
     
     
         66 . The method according to  claim 65 , wherein the voids are representative of at least one of: conventional perforations; deep perforations; sand jet perforations; jet propelled perforations; hydraulic fractures; and natural fractures. 
     
     
         67 . The method according to  claim 65 , wherein the viscous resistance of the one or more zones is derived from the permeability of a sample material obtained from the surrounding formation that has been subjected to the formation damage. 
     
     
         68 . The method according to  claim 65 , wherein the method comprises determining two or more zones, each zone associated with a different viscous resistance; the viscous resistance being derived from a sample material obtained from the surrounding formation having been subjected to different amounts of formation damage. 
     
     
         69 . The method according to  claim 67 , wherein the viscous resistance is derived from a sample material obtained from the surrounding formation oriented in a manner to reflect an orientation of a formation in the subterranean region. 
     
     
         70 . The method according to  claim 67 , wherein the viscous resistance is derived from a sample material obtained from the surrounding formation that has been subjected to drilling fluid or mud flow. 
     
     
         71 . The method according to  claim 65 , wherein at least one zone is representative of a layer of mud cake. 
     
     
         72 . The method according to  claim 65 , wherein each further zone represents a different degree of formation damage. 
     
     
         73 . The method according to  claim 65 , further comprising computationally modelling production fluid flow from the one or more determined zones and the one or more voids to the wellbore. 
     
     
         74 . The method according to  claim 73 , further comprising modelling production fluid flow from the subterranean region to a surface region of the wellbore. 
     
     
         75 . The method according to  claim 65 , comprising computationally modelling, within the wellbore, one or more wellbore components, and modelling fluid flow in the wellbore. 
     
     
         76 . A method of computational fluid dynamic modelling of a subterranean region comprising a wellbore and surrounding formation, the method comprising:
 providing a computational geometric model of the subterranean region, the computational geometric model comprising the wellbore and surrounding formation;   determining one or more zones in the formation of the computational geometric model;   determining one or more voids in the surrounding formation, the voids being representative of perforation or fractures in the formation,   determining one or more wellbore components between the one or more zones and the wellbore,   associating a viscous resistance with at least one or more of the determined zones as a computational parameter; and   computationally modelling, using a computer, fluid flow through the one or more determined zones, through the one or more voids, through the wellbore components and through the wellbore using the associated viscous resistance of each of the one or more determined zones.   
     
     
         77 . The method according to  claim 76  wherein at least one zone is representative of a layer of mud cake. 
     
     
         78 . The method according to  claim 76  wherein each further zone represents a different degree of formation damage. 
     
     
         79 . The method according to  claim 76 , wherein the one or more wellbore components comprise at least one of: casing tubular; lining tubular; production tubular; flow device; inflow control device or valve; fracking valve; screen design; recirculation value; and gravel pack. 
     
     
         80 . A method of computational fluid dynamic modelling of a subterranean region comprising a wellbore and surrounding formation, the method comprising:
 providing a computational geometric model of the subterranean region, the computational geometric model comprising the wellbore and surrounding formation;   determining one or more zones in the formation of the computational geometric model;   determining one or more wellbore components between the one or more zones and the wellbore, and   associating a viscous resistance with at least one or more of the determined zones as a computational parameter; and   computationally modelling, using a computer, fluid flow through the one or more determined zones using the associated viscous resistance of each of the one or more determined zones, and modelling fluid flow between wellbore and the zones through the one or more components.   
     
     
         81 . The method according to  claim 80  further comprising modelling fluid flow through drainage ports of the wellbore components. 
     
     
         82 . The method according to  claim 80 , further comprising modelling fluid flow through a screen design of the wellbore components. 
     
     
         83 . The method according to  claim 80 , further comprising:
 determining one or more voids in the surrounding formation, the voids being representative of perforation or fractures in the formation;   associating a viscous resistance with one or more of the determined voids as a computational parameter; and   computationally modelling, using a computer, fluid flow through the one or more determined zones, the one or more voids, the one or more wellbore components and the wellbore using the associated viscous resistance of the one or more determined zones and one or more voids.   
     
     
         84 . The method according to  claim 80 , wherein the one or more wellbore components comprise at least one of: casing tubular; lining tubular; production tubular; flow device; inflow control device or valve; fracking valve; screen design; recirculation value; and gravel pack.