WELLBORE DEVICE FOR SELECTIVE TRANSFER OF FLUID

摘要

A wellbore device is provided which comprises a fluid passage (34) for transferring fluid between an earth formation (4) and a surface facility, and a body (42) transferable from a first mode to a second mode upon contact of the body with a selected fluid. Said body is arranged so as to substantially close the fluid passage upon transfer of the body from the first mode to the second mode due to contact of the body with the selected fluid.