Patent ID: 8757278

Claim:
A system for selectively actuating from a remote location multiple downhole well tools in a well, the system comprising: first, second, and third conductors; a first control device which controls actuation of a first well tool, wherein the first control device is connected between the first and second conductors, and wherein the first control device is not electrically connected to the third conductor; a second control device which controls actuation of a second well tool, wherein the second control device is connected between the first and third conductors, and wherein the second control device is not electrically connected to the second conductor, whereby a respective one of the first and second control devices is selected by applying at least a predetermined minimum voltage potential across a respective pair of the conductors; and first and second lockout devices, whereby current is prevented from flowing through the second control device when the first control device is selected, and whereby current is prevented from flowing through the first control device when the second control device is selected.