Patent ID: 8157017
Filing Date: 2012-04-17
Classification: E21B

Abstract:
1. A production tubing assembly, comprising: an upper flow path, a first flow zone and a second flow zone; a first valve sleeve having an open position and a closed position, the first valve sleeve allowing fluid communication between the first flow zone and the upper flow path when the first valve sleeve is in the open position, the first valve sleeve preventing fluid communication between the first flow zone and the upper flow path when the first valve sleeve is in the closed position; a second valve sleeve having an open position and a closed position, the second valve sleeve configured to allow fluid communication between the second flow zone and the upper flow path when the second valve sleeve is in the open position, the second valve sleeve configured to prevent fluid communication between the second flow zone and the upper flow path when the second valve sleeve is in the closed position; and a chemical injection system configured to inject an injection fluid from an injection fluid supply at a surface location comprising: