Geothermal exploitation low-thermal-resistance low-density composite well cementing material and preparation method thereof

Abstract

The invention provides a geothermal exploitation low-thermal-resistance low-density composite well cementing material and a preparation method thereof. The geothermal exploitation low-thermal-resistance low-density composite well cementing material is prepared from 100 parts of a solid-phase material, 75-85 parts of water, 0.4 part of latex and 0.1 part of a defoaming agent. The solid-phase material is prepared from the following raw materials in parts by weight: 2 to 10 parts of mixed crystalline flake graphite, 0.2 to 0.8 part of graphite oxide, 0.2 to 0.6 part of hexagonal boron nitride, 0.2 to 0.8 part of polyacrylonitrile-based carbon fiber, 0.5 part of pitch-based carbon fiber, 9 to 15 parts of quartz powder, 3 to 5 parts of calcium carbonate whisker, 6 to 9 parts of silica fume, 7 parts of fly ash, 4 to 6 parts of blast furnace slag, 0.2 part of dispersing agent, 2 parts of fluid loss agent, 0.2 part of early strength agent, 0.5 part of lattice expanding agent, 2 parts of crystal form stabilizer and the balance oil well cement, wherein the sum of the weight parts of the raw materials is 100. The heat transfer resistance of the well cementation material is greatly reduced while the well cementation performance index requirement is met, and the geothermal heat extraction efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the field of geothermal energy and relates to cementing materials, in particular to a composite cementing material with low thermal resistance and low density for geothermal exploitation and a preparation method thereof. Background technique [0002] Geothermal energy is a resource-rich, sustainable, safe and green renewable energy. Compared with coal, oil, natural gas, shale gas and nuclear energy, geothermal energy is inexhaustible; compared with wind energy and solar energy, geothermal energy is not disturbed by external natural environmental factors such as seasons, climate, and day and night changes, and can be used sustainably. [0003] my country's geothermal resources account for about 7.9% of the total global geothermal resources, especially the development potential of medium and low temperature geothermal resources is huge. In recent years, my country has preliminarily formed a geothermal energy industry system: sha...

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low thermal resistance and low density composite cementing material for geothermal exploitation and its preparation method, so as to solve the technical problem of high thermal resistance of the low density cementing material in the prior art

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