Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Cement expansion agent suitable for high temperature environment and preparation method thereof
The invention discloses a cement expansion agent suitable for a high temperature environment and a preparation method thereof. The cement expansion agent comprises the following components by mass percent: 85.0%-99.5% of a magnesium material, 0.5%-10.0% of a silicon material, 0-0.50% of an expansion inhibitor and 0-5.0% of a calcium material, wherein the magnesium material is prepared from any one or multiple combinations selected from magnesite, serpentine and hornblende through high-temperature calcination and sintering; the content of magnesium oxide in the magnesium material is greater than or equal to 85 wt%; the silicon material is one or multiple combinations selected from quartz sand and fumed silica; the content of silicon dioxide in the silicon material is greater than or equal to 92 wt%; the expansion inhibitor is one or multiple combinations selected from sodium citrate, tartaric acid and ethylenediamine tetraacetic acid disodium salt; the calcium material comprises calcium oxide and semi-hydrated gypsum; the content of calcium oxide is 0-45 wt%; the content of semi-hydrated gypsum is 55-100 wt%. When the cement expansion agent is used in a high-temperature oil well cement paste environment, the effect onset time of expansion of oil well cement is moderate, so that microgaps caused by shrinkage after cement paste solidification can be effectively filled up.
Cement expansion agent suitable for high temperature environment and preparation method thereof
The invention discloses a cement expansion agent suitable for a high temperature environment and a preparation method thereof. The cement expansion agent comprises the following components by mass percent: 85.0%-99.5% of a magnesium material, 0.5%-10.0% of a silicon material, 0-0.50% of an expansion inhibitor and 0-5.0% of a calcium material, wherein the magnesium material is prepared from any one or multiple combinations selected from magnesite, serpentine and hornblende through high-temperature calcination and sintering; the content of magnesium oxide in the magnesium material is greater than or equal to 85 wt%; the silicon material is one or multiple combinations selected from quartz sand and fumed silica; the content of silicon dioxide in the silicon material is greater than or equal to 92 wt%; the expansion inhibitor is one or multiple combinations selected from sodium citrate, tartaric acid and ethylenediamine tetraacetic acid disodium salt; the calcium material comprises calcium oxide and semi-hydrated gypsum; the content of calcium oxide is 0-45 wt%; the content of semi-hydrated gypsum is 55-100 wt%. When the cement expansion agent is used in a high-temperature oil well cement paste environment, the effect onset time of expansion of oil well cement is moderate, so that microgaps caused by shrinkage after cement paste solidification can be effectively filled up.
Cement expansion agent suitable for high temperature environment and preparation method thereof
LI JILIANG (Autor:in)
25.11.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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