Patent ID: 8955600
Filing Date: 2015-02-17
Classification: E21B

Abstract:
1. A multi-barrier system comprising: a first valve in fluidic communication with a lower completion; a second valve in fluidic communication with the lower completion, the first valve and the second valve being in series such that flow through one of the first and the second valve also flows through the other of the first and the second valve, the first valve and the second valve being positioned proximate an uphole extent of the lower completion; and a member in operable communication with the first valve and the second valve configured to cause the first valve and the second valve to actuate between open and closed by movement of the member, the member configured to have both the first valve and the second valve open in response to the member being in a first position, the first valve closed and the second valve open in response to the member being in a second position, the first valve open and the second valve closed in response to the member being in a third position, and the first valve and the second valve both closed in response to the member being in a fourth position, each of the first position, the second position, the third position and the fourth position being a different position with each of the four positions of the member being achieved in sequence in response to the member moving in a same direction, the first valve and the second valve being closable in response to retrieval of an upper completion.