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

A modified material and ultra-high temperature technology, which is applied in the field of oil and gas field exploration and development, can solve the problems of cementing operations in complex formations of ultra-high temperature and ultra-deep wells, strength decline, ultra-high temperature cement stone toughening, and insufficient ultra-high temperature strength, etc., to achieve low cost, Improved mechanical properties and good temperature resistance

Active Publication Date: 2021-12-21
CNPC DRILLING RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 70 parts of the first high-temperature strength anti-fading material (600 mesh acid quartz sand), 25 parts of the second high-temperature strength anti-fading material (100 mesh wollastonite and coke gemstone compounded at a mass ratio of 1:1), ultra-high temperature increasing 5 parts of tough material (halloysite nanotubes), and the three are fully mixed to obtain a composite ultra-high temperature cement stone mechanically modified material.

Embodiment 2

[0029] Weigh 70 parts of the first high-temperature strength anti-fading material (800 mesh acid quartz sand), 25 parts of the second high-temperature strength anti-fading material (100 mesh wollastonite and 200 mesh bauxite compounded at a mass ratio of 1:1), 5 parts of ultra-high temperature toughening material (halloysite nanotubes), and the three are fully mixed to obtain a composite ultra-high temperature cement stone mechanically modified material.

Embodiment 3

[0031] Weigh 75 parts of the first high-temperature strength anti-fading material (600 mesh acid quartz sand), 20 parts of the second high-temperature strength anti-fading material (200 mesh kyanite and 200 mesh bauxite compounded at a mass ratio of 1:1), 5 parts of ultra-high temperature toughening material (halloysite nanotubes), and the three are fully mixed to obtain a composite ultra-high temperature cement stone mechanically modified material.

[0032] Compare the effects of the examples and the ordinary quartz sand on the mechanical properties of 240°C ultra-high temperature cement stone, and measure the compressive strength of the hardened cement stone after curing for 2 days, 7 days, 28 days, and 60 days under the condition of 240°C*20MPa and Young's modulus, the results are shown in Table 1.

[0033] Table 1 The mechanical properties of 240°C ultra-high temperature cement stone prepared by using the examples and quartz sand respectively

[0034]

[0035] Formula:...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/10C04B28/00
CPCC04B40/0039C04B28/00C04B2201/50C04B14/06C04B14/043C04B14/10C04B14/04
Inventor 刘慧婷林志辉于永金付家文闫振峰丛谧赵殊勋李明张弛刘子帅
Owner CNPC DRILLING RES INST
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