Abstract: In order to resolve the problem of casing running in cluster wells in Huning 4 Block of Venezuela,this article analyzed technical difficulties in casing running in shallow 3D horizontal wells,discussed the optimization of float running by using software simulation.Friction between string and well bore is the main factor affecting casing running.Simulation calculation showed float running φ244.5 mm casing and φ177.8 mm casing string with 600 m and 1 450 m air section was the best plan.This article summarized shallow formation,high horizontal-displacement to vertical-depth ratio,3D horizontal well running measures and presented several application examples.Field application showed that appropriate float running technology combined with software simulation and optimization could resolve the difficulties encountered in casing running in shallow high horizontal-displacement to vertical-depth ratio 3D horizontal wells in Venezuela.