| 摘要 |
<p>Aqueous silicate solutions when admixed, intermingled or otherwise contacted with hydraulic cement slurries cause a very rapid gelation and accelerated setting of the hydraulic cement composition. It has now been discovered that this rapid gelation/accelerated setting phenomenon can be controlled and substantially delayed by incorporating a water soluble inorganic phosphate salt into an aqueous spacer fluid positioned between said silicate solution and said cement slurry as such materials are being sequentially injected into a subterranean formation.</p> |
