A flow regulator for use in a subterranean well. A well flow regulating system includes a flow regulator for regulating a flow rate of a fluid in a wellbore, the flow rate remaining substantially constant while a differential pressure across the flow regulator varies. The flow regulator is adjustable...http://www.google.com/patents/US7819194?utm_source=gb-gplus-sharePatent US7819194 - Flow regulator for use in a subterranean well
