High temperature resistant declining admixture for oil well cement and preparation method thereof

Abstract

The invention discloses a high temperature resistant declining admixture for oil well cement and a preparation method thereof, and solves the problem that a cement paste system is not suitable for well cementation of geothermal wells with superhigh temperature and superhigh temperature difference in the prior art. The high temperature resistant declining admixture comprises 40% to 60% of photovoltaic silicon, 15% to 30% of fumed silica, 15% to 30% of dead burned magnesia and 1% to 2% of mineral fiber. According to the high temperature resistant declining admixture, the compressive strength of200 DEG C or more can be effectively guaranteed, and the effect of reducing the declining of the compressive strength is reached.

Description

technical field [0001] The invention relates to the field of cement external admixtures, in particular to an oil well cement anti-high temperature recession external admixture and a preparation method thereof. Background technique [0002] my country is relatively rich in geothermal resources. The total amount of geothermal resources accounts for about 7.9% of the world's total, and the recoverable reserves are equivalent to 462.65 billion tons of standard coal. steam), geothermal resources can not only provide clean energy, but also a hot brine resource and natural fertilizer water resource for extracting industrial raw materials such as bromine, iodine, borax, potassium salt, and ammonium salt. In today's environment with huge environmental pressure and the promotion of new energy development, geothermal resources will be fully utilized. [0003] The cementing of geothermal wells is similar to the cementing of ultra-high temperature oil and gas wells. During the injection ...

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