Outflow control device, systems and methods
A well tool assembly can include a well screen configured to filter fluid flow between an interior and an exterior of a tubular string, and an outflow control section that permits the fluid flow in an outward direction and prevents the fluid flow in an inward direction, the outflow control section including at least two outflow control valves arranged in series. A method can include installing a well tool assembly including a well screen, flowing a fluid from an exterior to an interior of a tubular string through the well screen and an inflow control valve of the well tool assembly, and flowing another fluid from the interior to the exterior of the tubular string through the well screen and at least one outflow control valve of the well tool assembly.
1. A method for use with a subterranean well, the method comprising:
installing a well tool assembly in the well, the well tool assembly including a well screen configured to filter fluid flow between an interior and an exterior of a tubular string in the well;
flowing a first fluid from the exterior to the interior of the tubular string, the first fluid thereby flowing through the well screen and an inflow control valve of the well tool assembly; and
flowing a second fluid from the interior to the exterior of the tubular string, the second fluid thereby flowing through the well screen and first and second outflow control valves of the well tool assembly, in which the second outflow control valve is in series with the first outflow control valve.
2. The method of claim 1 , further comprising the inflow control valve closing in response to the second fluid flowing.
3. The method of claim 1 , in which the inflow control valve comprises a check valve that permits the first fluid to flow from the exterior to the interior of the tubular string through the inflow control valve and prevents the second fluid to flow from the interior to the exterior of the tubular string through the inflow control valve.
4. The method of claim 1 , further comprising the first outflow control valve closing in response to the first fluid flowing.
5. The method of claim 1 , in which the first outflow control valve comprises a check valve that permits the second fluid to flow from the interior to the exterior of the tubular string through the first outflow control valve and prevents the first fluid to flow from the exterior to the interior of the tubular string through the first outflow control valve.
6. The method of claim 1 , in which the first outflow control valve opens at a first pressure differential from the interior to the exterior of the tubular string, and the second outflow control valve opens at a second pressure differential from the interior to the exterior of the tubular string, the second pressure differential being greater than the first pressure differential.
7. The method of claim 6 , further comprising setting a packer in the well by applying a third pressure differential to the tubular string, the second pressure differential being greater than the third pressure differential.
8. The method of claim 6 , further comprising fracturing an earth formation by applying a third pressure differential to the tubular string, the second pressure differential being greater than the third pressure differential.
9. The method of claim 6 , further comprising opening a pressure-actuated valve in the well by applying a third pressure differential to the tubular string, the second pressure differential being greater than the third pressure differential.
10. The method of claim 6 , in which the installing comprises applying a third pressure differential to the tubular string due to circulating flow through the tubular string, the second pressure differential being greater than the third pressure differential.
11. The method of claim 1 , in which the first outflow control device presents a first restriction to the second fluid flow, and the second outflow control device presents a second restriction to the second fluid flow, the second restriction being greater than the first restriction.
12. The method of claim 1 , in which the first outflow control valve comprises a check valve, and the second outflow control valve comprises a relief valve.
13. The method of claim 1 , in which the first and second outflow control valves each comprise a check valve.
14. The method of claim 1 , in which the installing comprises preventing the fluid flow from the interior to the exterior of the tubular string through the well screen.
15. The method of claim 1 , in which the installing is performed without a wash pipe in the tubular string.