Variable Flow Resistance System with Circulation Inducing Structure Therein to Variably Resist Flow in a Subterranean Well

摘要

A variable flow resistance system (25) for use in a subterranean well can include a flow chamber (84) having an outlet (40) and at least one structure (94) which resists a change in a direction of flow of a fluid composition (36) toward the outlet (40). The fluid composition (36) may enter the chamber (84) in the direction of flow which changes based on a ratio of desired fluid to undesired fluid in the fluid composition (36). Another variable flow resistance system (25) can include a flow chamber (84) through which a fluid composition (36) flows, the chamber (84) having an inlet (86,88), an outlet (40), and a structure (94) which impedes a change from circular flow about the outlet (40) to radial flow toward the outlet (40).