Hydraulic Delay Toe Valve System and Method

摘要

An apparatus and method for providing a time delay in injection of pressured fluid into a geologic formation. In one aspect the invention is a toe valve activated by fluid pressure that opens ports after a predetermined time interval to allow fluid to pass from a well casing to a formation. The controlled time delay enables casing integrity testing before fluid is passed through the ports. This time delay also allows multiple valves to be used in the same well casing and provide a focused jetting action to better penetrate a concrete casing lining.

主权项

1. An apparatus integrated into a well casing, a time delay injection valve with a seating surface built into said valve; said seating surface is configured to seat a restriction plug element;
whereby, when a leak is detected in said well casing during a casing integrity test, a restriction plug element is dropped to seat in said conforming seating surface to determine if said leak is due to said wet shoe.