Patent ID: 8701777
Filing Date: 2014-04-22
Classification: E21B

Abstract:
1. A downhole fluid flow control method for sequentially treating multiple zones, the method comprising: isolating first, second and third zones in a wellbore, each zone having a fluid flow control device positioned therein; establishing communication between the second zone and the fluid flow control device in the first zone; establishing communication between the first zone and the fluid flow control device in the second zone; establishing communication between the third zone and the fluid flow control device in the second zone; establishing communication between the second zone and the fluid flow control device in the third zone; injecting a treatment fluid from a tubing string through the fluid flow control device of the first zone while the fluid flow control devices of the second and third zones are in the closed position; generating a first differential pressure between the first zone and the second zone; responsive to the first differential pressure, opening the fluid flow control device in the second zone and closing the fluid flow control device in the first zone; injecting the treatment fluid from the tubing string through the fluid flow control device of the second zone while the fluid flow control devices of the first and third zones are in the closed position; generating a second differential pressure between the second zone and the third zone; and responsive to the second differential pressure, opening the fluid flow control device in the third zone and closing the fluid flow control device in the second zone; and injecting the treatment fluid from the tubing string through the fluid flow control device of the third zone while the fluid flow control devices of the first and second zones are in the closed position.