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A fluid discrimination system can include a fluid discriminator which selects through which of multiple outlet flow paths a fluid composition flows, the selection being based on a direction of flow of the fluid composition through the discriminator, and the direction being dependent on a fluid type

A fluid discrimination system can include a fluid discriminator which selects through which of multiple outlet flow paths a fluid composition flows, the selection being based on a direction of flow of the fluid composition through the discriminator, and the direction being dependent on a fluid type in the fluid composition. Another fluid discriminator can include a structure which displaces in response to a fluid composition flow, whereby an outlet flow path of the fluid composition changes in response to a change in a ratio of fluids in the fluid composition. A method of discriminating between fluids can include providing a fluid discriminator which selects through which of multiple outlet flow paths a fluid composition flows in the well, the selection being based on a direction of flow of the fluid composition through the discriminator, and the direction being dependent on a ratio of the fluids in the fluid composition.

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1. A fluid discrimination system for use with a subterranean well, the system comprising: a fluid discriminator through which a fluid composition flows in the subterranean well, the fluid discriminator including first and second chambers; andthe fluid discriminator selects through which of multiple

1. A fluid discrimination system for use with a subterranean well, the system comprising: a fluid discriminator through which a fluid composition flows in the subterranean well, the fluid discriminator including first and second chambers; andthe fluid discriminator selects through which of multiple outlet flow paths the fluid composition flows,wherein the fluid discriminator selects a first outlet flow passage of the second chamber in response to a direction of flow being more radial through the first chamber, andwherein the fluid discriminator selects a second outlet flow passage of the second chamber in response to the direction of flow being more rotational at an inlet of the second chamber due to rotational flow at the outlet of the first chamber. 2. The system of claim 1, wherein the fluid discriminator selects the first outlet flow passage in response an increase in a ratio of desired to undesired fluid in the fluid composition, and wherein the fluid discriminator selects the second outlet flow passage in response to a decrease in the ratio of desired to undesired fluid. 3. The system of claim 1, wherein a fluid switch selects in which direction the fluid composition flows. 4. A method of discriminating between fluids flowed in a subterranean well, the method comprising: providing a fluid discriminator which includes first and second chambers;the fluid discriminator selecting which of multiple outlet flow passages a fluid composition flows through in the well,wherein the fluid discriminator selects a first outlet flow passage of the second chamber in response to a direction of flow being more radial through the first chamber, andwherein the fluid discriminator selects a second outlet flow passage of the second chamber in response to the direction of flow being more rotational at an inlet of the second chamber due to rotational flow at the outlet of the first chamber. 5. The method of claim 4, wherein the fluid discriminator selects the first outlet flow passage in response to an increase in a ratio of fluids in the fluid composition, and wherein the fluid discriminator selects the second outlet flow passage in response to a decrease in the ratio of fluids. 6. The method of claim 4, wherein a fluid switch selects in which direction the fluid composition flows.