Patent ID: 6131655
Filing Date: 2000-10-17
Classification: E21B

Abstract:
A production string assembly for producing hydrocarbon fluid from a wellbore having a zone subject to coning during production, said assembly comprising;production tubing extending down into the wellbore from the surface to a hydrocarbon rich production zone, a water rich production zone and disposal zone;a first packer in the wellbore isolating a first pair of said zones from each other;a second packer in the wellbore isolating a second pair of said zones from each other;a first pump and motor arrangement receiving produced hydrocarbon rich fluid from the hydrocarbon rich zone and delivering the hydrocarbon rich fluid under pressure to the surface;a second pump and motor arrangement together with a separator separated from the first arrangement by one of the packers and receiving produced fluid from the water rich production zone and separating it into a hydrocarbon rich stream and a water rich stream for disposal in the disposal zone;a first fluid flow connection between the separator through said one of said packers for flow of the hydrocarbon rich stream from the separator to the first pump and motor arrangement; anda second fluid flow connection between the separator and the disposal zone through the other of said packers for delivery of the water rich stream of the second separator to the disposal zone,wherein at least one of the packers is positioned generally at the interface between the water rich zone and the hydrocarbon rich production zone and further comprising a sensor that monitors the level of the oil/water interface in the wellbore positioned adjacent said packer positioned generally at the interface.