Numerical simulation of hydrocarbon systems with viscosity gradient

A non-transitory computer-readable storage medium storing instructions executable by one or more computer processors, the instructions when executed by the one or more computer processors cause the one or more computer processors to:

• receive a plurality of Neutron Magnetic Resonance (NMR) logs for a plurality of hydrocarbon wells in an oilfield;
• identify a plurality of viscosity regions of hydrocarbons present within the plurality of hydrocarbon wells based on the plurality of NMR logs;
• determine equation of state (EOS) parameters based on compositional analysis of pressure-volume-temperature (PVT) samples obtained from the plurality of hydrocarbon wells;
• generate a three-dimensional (3D) numerical simulation model of the plurality of viscosity regions across the oilfield, the generating of the 3D numerical simulation model's 3D viscosity array is model based on the EOS parameters and a fluid composition gradient with respect to a depth within each viscosity region, wherein each viscosity region corresponds to a depth interval between viscosity surfaces within the 3D numerical simulation model, each viscosity surface associated with a particular depth from a surface of the Earth as identified from the plurality of wells having NMR logs;
• and
• determine a landing depth from the surface of the Earth for operation of peripheral water injectors based on simulating the 3D numerical simulation model comprising the plurality of viscosity regions of the hydrocarbons present within the plurality of hydrocarbon wells having NMR logs, wherein the viscosity regions are correlated across the oilfield.

A computer system comprising:

• one or more computer processors;
• and
• a non-transitory computer-readable storage medium storing instructions executable by the one or more computer processors, the instructions when executed by the one or more computer processors cause the one or more computer processors to:
• receive a plurality of Neutron Magnetic Resonance (NMR) logs for a plurality of hydrocarbon wells in an oilfield;
• identify a plurality of viscosity regions of hydrocarbons present within the plurality of hydrocarbon wells based on the plurality of NMR logs;
• determine equation of state (EOS) parameters based on compositional analysis of pressure-volume-temperature (PVT) samples obtained from the plurality of hydrocarbon wells;
• generate a three-dimensional (3D) numerical simulation model comprising the plurality of viscosity regions across the oilfield, the generating of the 3D numerical simulation model's 3D viscosity array is based on the EOS parameters and a fluid composition gradient with respect to a depth within each viscosity region, wherein each viscosity region corresponds to a depth interval between viscosity surfaces within the 3D numerical simulation model, each viscosity surface associated with a particular depth from a surface of the Earth as identified from the plurality of wells having NMR logs;
• and
• determine a landing depth from the surface of the Earth for operation of peripheral water injectors based on the 3D numerical simulation model comprising the plurality of viscosity regions of the hydrocarbons present within the plurality of hydrocarbon wells having NMR logs, wherein the viscosity regions are correlated across the oilfield.