| 摘要 |
A system allows for sequential treatment of sections of a zone. Access to eac portion can be with a sliding sleeve (30) that has a specific internal profile. Pump down plugs (10) can be used that have a specific profile that will make a plug latch to a specific sleeve. Pressure on the plug when latche allows a sequential opening of sleeves while zones already affected that are below are isolated. The pump down plugs have a passage that is initially obstructed by a material (44) that eventually disappears under anticipated well conditions. As a result, when all portions of a zone are handled a flow path is reestablished through the various latched plugs. The plugs can also b blown clear of a sliding sleeve after operating it and can feature a key that subsequently prevents rotation of the plug on its axis in the event is later needs milling out.
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