Patent ID: 8776914

Claim:
A method, comprising: drilling a main borehole into an underground reservoir comprising a plurality of layers of different fluid mobilities; determining pressure differences between ones of the plurality of layers; determining formation permeability and porosity in each of the plurality of layers; determining the fluid mobility in each of the plurality of layers based on inclination of the main borehole and the determined formation permeability and porosity corresponding to each of the plurality of layers; and drilling a number of lateral boreholes extending from the main borehole in each of the plurality of layers, wherein lengths, diameters, deviations, axial positions, azimuthal arrangements, and the numbers of the lateral boreholes in each of the plurality of layers are collectively based on the determined fluid mobility in each of the plurality of layers, the determined pressure differences between ones of the plurality of layers, and the thickness of each of the plurality of layers, such that resulting fluid production rates in each of the plurality of layers are substantially similar.