A composite ultra-high temperature cement stone mechanically modified material and its preparation method

Abstract

The invention relates to a composite ultra-high temperature cement stone mechanically modified material, which is composed of the following components in parts by weight: 65-75 parts of the first high-temperature strength anti-fading material, 20-30 parts of the second high-temperature strength anti-fading material, super 5 parts of high temperature toughening material. The first high-temperature strength anti-fading material is pickled quartz sand with a particle size of 400 mesh or more. The second high-temperature-strength anti-recession material is a compound mixture of wollastonite, kyanite, burnt gemstone, and bauxite, and the fineness is between 100-400 mesh. The ultra-high temperature toughening material is halloysite nanotubes. The preparation method of the composite ultra-high temperature cement stone mechanically modified material is obtained by fully mixing and stirring the first high-temperature strength anti-fading material, the second high-temperature strength anti-fading material, and the ultra-high temperature toughening material according to specified weight parts. The invention can ensure that the strength of the cement stone does not decline under the ultra-high temperature condition, has better toughness, can effectively improve the mechanical properties of the ultra-high temperature cementing cement stone above 240°C, and has broad market application prospects.

Description

technical field [0001] The invention relates to a composite ultra-high temperature cement stone mechanically modified material and a preparation method thereof in the field of exploration and development of oil and gas fields, which are used for improving the mechanical properties of ultra-high temperature cement stone for well cementing above 240°C. Background technique [0002] With the rapid development of my country's economy and society, the demand for oil and gas resources continues to grow. In order to ensure national energy security and reduce oil and gas dependence on foreign countries, it is necessary to increase exploration and development efforts. Deep and ultra-deep oil and gas have great potential and are important replacement resources. Basins such as Tarim, Junggar, Sichuan, and Qaidam have successively proven oil and gas reservoirs deeper than 8,000 m. With the deepening of oil and gas exploration and development, the number of deep and ultra-deep wells has ...

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Problems solved by technology

Invention patent "An oil well cement slurry system for preventing high-temperature strength decline and its preparation method" (CN 110484223 A) uses graphene emulsion as a strength enhancer, and micron-sized shaped silica and 8-12% xanthogen as a suspension stabilizer Adhesive and cement slurry have good construction performance at 180°C, the strength is 35MPa, and will not decline within 14 days, but the cost of materials used in this method is relatively high, and it is not suitable for cementing construction under ultra-high temperature conditions above 200°C

Invention patent "a cement for ultra-high temperature deep wells and its preparation method and application" (CN 110563428 A) uses silicon powder as the first anti-strength decay agent, and the second anti-strength decay agent is aluminum oxide, hydroxide One or more of aluminum, zinc oxide, zinc hydroxide and strontium chloride, the cement stone strength does not decline at 200°C to 240°C to 30MPa, and the ultra-high temperature strength of this method is not high enough, and the toughness modification is not carried out

[0005] Although the above existing technologies have achieved certain effects in the mechanical modification of high-temperature cement, there are still problems in the strength decline and toughening of ultra-high temperature cement stones, which cannot meet the cementing operations of ultra-high temperature and ultra-deep wells in complex formations.

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