MULTI-ZONE FRACTURING IN A RANDOM ORDER

摘要

A multi-zone formation has a plurality of sliding sleeve valves for selective access to the formation from the wellbore. Each of the sliding sleeves has a unique latch profile such that an initial dart with a matching profile will land on the predetermined sleeve. With all the sliding sleeves initially in the position where access ports are closed the sleeve that gets the first dart has pressure applied to shift that sleeve to the ports open position for well treatment. Thereafter, a second dart lands on the first effectively closing the ports just opened. Further pressure closes the sliding sleeve and blows both darts to hole bottom. Any other sleeve can then be selected with a unique profile that matches another sliding sleeve and the process repeats. For production selected sliding sleeves are opened preferably with a wireline shifting tool.

主权项

1. A multizone formation treating method, comprising:
locating valves having a unique latching profiles at spaced locations in a tubular extending to the zones in the formation; delivering a first object having a matching profile to at least one said latch profile for sealingly landing on the valve associated therewith; moving said valve with said landed first object with pressure to open at least one tubular wall port to the formation at said at said valve; treating the formation through said at least one opened port; closing said at least one port associated with the valve that has the landed first object without intervention into a borehole extending to the formation; removing said landed first object from the landed position on said valve to open a passage through that valve; and repeating the above with at least one additional object having a different latch profile designed to land in another predetermined said valve.