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High temperature retarders for oil field cements, cement slurries and corresponding cementing processes
High temperature retarders for oil field cements, cement slurries and corresponding cementing processes
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机译:用于油田水泥,水泥浆和相应固井工艺的高温缓凝剂
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摘要
The invention relates to the cementing of high temperature wells. The retarder consists of a methylene phosphonic acid derivative and of a boric acid or a borate at least as acid as borax in an aqueous solution, in particular, Na pentaborate, in a preferred ratio of 0.08 to 0.92 parts by weight. A long setting time and a very swift compressive strength development are obtained at the same time.
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