Patent ID: 9140096
Filing Date: 2015-09-22
Classification: E21B

Abstract:
1. A valve system for use in a wellbore, comprising a side pocket mandrel, wherein: the side pocket mandrel comprises an elongated body section, the elongated body section being provided with a substantially fully open main bore for alignment with a well tubing and a laterally offset side pocket provided with a bore, the substantially fully open main bore and the laterally offset side pocket bore being separated by an internal wall, at least one through opening is provided in the side pocket mandrel, leading into the side pocket bore, and at least one through opening is provided in the internal wall leading into the main bore, where the at least two openings are in fluid communication through the side pocket bore, and in said side pocket bore at least two valves are arranged in series to form a double fluid barrier between the main bore and an outside of the pocket mandrel, the at least two valves being independently retrievable through at least one installation opening arranged in the internal wall of the side pocket mandrel, wherein the at least two valves are configured to open or close in response to pressure.