| 摘要 |
A method of forming a seal in a downhole pipe comprising positioning a dump bailer containing a predetermined amount of a cement slurry at a desired location in a pipe disposed downhole in an earth borehole, displacing the cement slurry from the dump bailer, and allowing the cement slurry to set and form a seal, wherein the cement slurry comprises a pumpable slurry containing a hydraulic cement; water; a water-soluble salt of a metal selected from the class consisting of alkali metals, alkaline earth metals, zinc, and mixtures thereof; a dispersant comprising an anionic surface-active agent of the sulfonated naphthlalene; and magnesium chloride.
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