| 摘要 |
A downhole tool 24 provided within a casing string for use in cement staging operations. The tool includes a sleeve 54 in the tool that selectively slides downward under pressure to expose ports 46 formed in a side wall of the tool 24. Also, an annulus through the tool 24 is selectively blocked so that cement in the casing string flows radially outward through the ports 46 and into an annulus between the tool 24 and a wellbore. An inflatable packer 66 is included that is integral to the body 25 of the tool 24 and is inflated with a fluid that is pushed into the packer 66 as the sleeve 54 slides downward. An optional expanding agent can be included in the packer 66 that is a metal oxide and is activated with the addition of water.
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