Abstract: The present disclosure generally relates to systems and methods for horizontal well completions, including dual monobore completions, without certain well intervention operations. More specifically, the embodiments described herein generally eliminate certain well intervention operations, such as cleaning of cementing-related equipment and accessories (e.g., plugs, balls, and so forth), performing logging operations, running and cementing intermediate casings, and so forth. In certain embodiments, a production casing may be run into a wellbore and cemented into place within the wellbore directly adjacent a surface casing of the well. In certain embodiments, the production casing comprises first and second tubular sections longitudinally separated by an intermediate tapered section.

Abstract: The present disclosure generally relates to systems and methods for horizontal well completions, including dual monobore completions, without certain well intervention operations. More specifically, the embodiments described herein generally eliminate certain well intervention operations, such as cleaning of cementing-related equipment and accessories (e.g., plugs, balls, and so forth), performing logging operations, running and cementing intermediate casings, and so forth. In certain embodiments, a production casing may be run into a wellbore and cemented into place within the wellbore directly adjacent a surface casing of the well. In certain embodiments, the production casing comprises first and second tubular sections longitudinally separated by an intermediate tapered section.

Abstract: A main borehole is drilled into an underground reservoir comprising a plurality of layers of different fluid mobilities. The fluid mobility in each of the plurality of layers is determined. A number of lateral boreholes extending from the main borehole in each of the plurality of layers are then drilled based on the determined fluid mobility in each of the plurality of layers, such that resulting fluid production rates in each of the plurality of layers are substantially similar.

Abstract: A method of determining the arrangement of lateral boreholes to be drilled from a main borehole that traverses an underground reservoir comprising at least two layers of different fluid mobility, the method comprising: determining formation parameters in each layer of interest so as to determine the fluid mobility in each layer; and determining borehole parameters for a series of lateral boreholes in each layer, the number, arrangement and dimensions of the lateral boreholes being selected such that the drainage surface in each layer provides for substantially similar fluid drainage in each layer irrespective of the fluid mobility in that layer.