Downhole Apparatus
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[0111]Referring first to FIGS. 1 and 2, there is shown a downhole cementing apparatus, in the form of a cement dart 10, according to an embodiment of the present invention. In use, the dart 10 may be employed during a downhole cementing operation, the dart 10 being deployable through a downhole tool 12 (FIG. 2) with a volume of cement 14 and configured to provide a varying point of sealing contact 16 between the dart 10 and the downhole tool 12 which permits the cement 14 to be driven through the downhole tool 12.
[0112]As shown in FIG. 1, the dart 10 comprises a body in the form of a mandrel 18 and a sealing arrangement 20 for providing the sealing contact 16. In the illustrated embodiment, the sealing arrangement 20 comprises a plurality of axially spaced seal members 22a, 22b, 22c, 22d, 22e and, in use, the dart 10 is configured so that as the dart 10 is deployed though the downhole tool 12 the point of sealing contact 16 between the dart 10 and the...
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Abstract
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