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AssigneeSchlumberger Technology Corporation
InventorTerry Wayne Stone
Estimating the term…
A reservoir simulator first estimates rock displacement parameters (u, v, and w) representing rock movement in the x, y, and z directions. When the rock displacement parameters (u, v, w) are determined, “εx,y,z” (the ‘x,y,z elongation strains’) and “γxy,yz,xz” (the ‘shear strains’) are determined since “εx,y,z” and “γxy,yz,xz” are function of “u”, “v” and “w.” When “εx,y,z” and “γxy,yz,xz” are determined, “σx,y,z” (the ‘elastic normal rock stress in x,y,z directions’) and “τxy,yz,xz” (the ‘elastic shear stress’) are determined since “σx,y,z” and “τxy,yz,xz” are a function of “εx,y,z” and “γxy,yz,xz”. When “σx,y,z” and “τxy,yz,xz” are determined, the rock momentum balance differential equations can be solved, since these equations are a function of “σx,y,z” and “τxy,yz,xz”. When any residuals are substantially equal to zero, the estimated rock displacement parameters (u, v, and w) represent ‘accurate rock displacement parameters’ for the reservoir. When the rock momentum balance differential equations are solved, the rock displacement parameters (u, v, w), at an advanced time, are known. These rock displacement parameters (u, v, w) represent and characterize ‘subsidence’ in a seabed floor because subsidence results from rock movement; and rock movement results from withdrawal of oil or other hydrocarbon deposits or other fluids from an Earth formation. This ‘abstract of the disclosure’ is given for the sole purpose of allowing a patent searcher to easily determine the content of the disclosure in this application.
In a method of utilizing reservoir simulator software to determine subsidence resulting from the withdrawal of fluids from a subterranean reservoir by solving a set of failure criterion equations which comprise the residuals and any derivatives, to determine a set of rock plastic displacements, the improvement comprising an equilibration technique for initialization of stresses and pore volumes comprising the steps of applying traction boundary conditions at the surface of a gridded reservoir and thereafter finding a rock state that satisfies the equation
An equilibration method adapted to initiate stresses and pore volumes and to solve for rock displacements in a reservoir, comprising:
A program storage device readable by a machine tangibly embodying a program of instructions executable by the machine to perform method steps adapted to practice an equilibration method for initiating stresses and pore volumes and solving for rock displacements in a reservoir, said method steps comprising:
A computer program adapted to be executed by a processor, said computer program, when executed by said processor, conducting a process adapted to practice an equilibration method for initiating stresses and pore volumes and solving for rock displacements in a reservoir, said process comprising:
Dependencies are inferred from the claim text.