| 摘要 |
Cementing apparatus to be used for well cementing operations comprising an intermediate casing (10) which features one or several cementing ports (12), a main tool (21) with one or several cementing channels (22) located with their outlets aligned with the cementing ports (12), a main sealing sleeve (13) and an auxiliary sleeve (17) that features one or several port openings (15, 19), the main sealing and pilot sleeves (13, 17) as a unit in an initial lower position closing the connection between the cementing channels (22) and the cementing ports (12), and forming the said connection in a second vertically shifted position through the port openings (15, 19). A procedure for execution of a cementing operation.
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