The article presents well patterns with different orientation of horizontal well against bush for oil rims is considered. Line and radial pattern is compared. Physical processes occurring at oil rim development by such well system is described. When wells are arranged in line pattern, there is uniform gas coning along well bore, but well drilling by line pattern requires relative high investments due to relative high amount of bushes as compared with radial well pattern. When wells are arranged in radial pattern, there is interference between gas cones near the heels of horizontal wells, but such scheme has smaller cost due to possibility of connection in one bush of large amount of well. Also method for determine of optimum well orientation system is presented. Efficiency criteria is NPV, well production profile is calculated using analytical theory based on Butler's model of critical production for horizontal wells in oil rims. Calculation results are presented in the form of areas with optimum well orientation scheme at the chart with coordinates gas cone width and well spacing. Also there is an example of application of this method and comparison with optimum well orientation determination implemented with full-field calculations. Results of this work can be used for express-analysis of greenfield projects.
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