Nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and preparation method thereof

A technology of cementing slurry and nanomaterials, which is applied in the field of oil and gas well cementing, can solve the problems of being unable to meet the needs of ultra-high temperature cementing, unfavorable development of cement stone strength, and limited high-temperature resistance, so as to reduce porosity and promote water retention. The effect of speed of conversion and less impurities

Active Publication Date: 2019-04-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

Nano-silica is often added to the cementing slurry system to improve the anti-strength decline performance of oil well cement at high temperature, but the effect is not obvious if the amount of nano-silica is too small, and the addition of too much is due to the high reaction of nano-silica The activity will agglomerate, which increases the cost and the agglomerates are not conducive to the development of cement stone strength. Simply adding nano-silica has limited anti-high temperature effect and cannot meet the needs of ultra-high temperature cementing

Method used

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  • Nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and preparation method thereof
  • Nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and preparation method thereof
  • Nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and preparation method thereof

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preparation example Construction

[0057] The preparation process of coarse silica sand and fine silica sand is as follows: (1) Pulverization: Preliminarily pulverize vein quartz block into 50-80 mesh quartz particles with a compound crusher; (2) Acid leaching: use 37wt% concentrated hydrochloric acid, 10wt% hydrofluoric acid The volume ratio of acid and water is 10:1:10 to prepare an acid solution, acid leaching at room temperature for 12 hours, and stirring at a speed of 100r / min; (3) Washing and filtering: remove impurities mixed with coarse ore particles by washing with water (4) Grinding: using a ball mill, the ratio of material to ball is 1:2, the ratio of adding water is 50%, and the ball milling time is 30 minutes for grinding, and then the silica sand with different particle sizes is screened out.

[0058] Defoamer: purchased from Chengdu Oumericke Petroleum Technology Co., Ltd., DF-A grade.

[0059] High temperature fluid loss reducer: purchased from Chengdu Oumericke Petroleum Technology Co., Ltd., H...

Embodiment 1

[0067] Example 1: Taking G-grade oil well cement as an example, design the formula of ultra-high-temperature high-performance cementing slurry system modified by nanomaterials

[0068]A method for designing ultra-high-temperature high-performance cementing slurry system modified by mixing nanomaterials, comprising the following steps:

[0069] (1) According to the Hudson model, determine the particle size of the silica sand used to minimize the porosity of the cement slurry system; determine the mass ratio of silica sand with different particle sizes in the cement slurry system according to the Andreason equation.

[0070] (2) Determine the composition and content of the main minerals according to the type of oil well cement used, and calculate the calcium-silicon ratio of the cement used; according to the type of hydration products generated by the cement hydration reaction at different temperatures, determine the amount of silica sand to be added. Adjust the calcium-silicon ...

Embodiment 2

[0100] A nano-material mixed modified ultra-high temperature high-performance cement slurry system, including the following components by mass:

[0101] Oil well G-grade cement 100 parts, coarse silica sand 20 parts, fine silica sand 20 parts, chemical vapor deposition method nano-silica powder 6 parts, carbonization method nano-calcium carbonate powder 3 parts, defoamer 0.2 parts, drag reducer 2.5 parts, 10 parts of fluid loss reducer, 2 parts of retarder, 53.2 parts of water;

[0102] The preparation method comprises the following steps:

[0103] Mix oil well G-grade cement, coarse silica sand, fine silica sand, nano-silicon dioxide and nano-calcium carbonate evenly, then add water, defoamer, drag reducer, fluid loss reducer and retarder and stir evenly to obtain nano-material mixture Modified ultra-high temperature and high performance cementing cement slurry system.

[0104] The development curve of the compressive strength of the ultra-high-temperature high-performance ...

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Abstract

The invention relates to a nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and a preparation method thereof. The slurry system comprises the followingingredients in parts by weight: 100 parts of oil well cement, 15-25 parts of coarse silica sand, 15-20 parts of fine silica sand, 1-10 parts of nano-silicon dioxide, 1-10 parts of nano-calcium carbonate, 0.2-1 part of a defoaming agent, 4-10 parts of a fluid loss agent, 0-3 parts of a drag reduction agent, 0.5-4 parts of a retarder and 30-100 parts of water. In the slurry system, set cement has excellent compressive strength and toughness under superhigh temperature, and the compressive strength and the elasticity modulus cannot be obviously changed as the maintenance time is prolonged. The slurry system has good rheological property, lower water loss and proper thickening time, and the comprehensive properties of the slurry system can completely meet the related requirements of site wellcementing construction, so that the technical support is provided for well cementing under high temperature. A nano-material obtained by mixing the nano-silicon dioxide and the nano-calcium carbonateis added, and micropores of the set cement can be effectively filled, so that the system becomes denser. Therefore, the volume shrinkage of the set cement is relieved.

Description

technical field [0001] The invention relates to cementing cement slurry and its preparation method, in particular to a nano-material mixed modified ultra-high temperature high-performance cementing slurry system, which can effectively prevent cement stone strength from fading under ultra-high temperature conditions and maintain a high level The performance of the cement stone belongs to the technical field of oil and gas well cementing. Background technique [0002] The 2015 China oil and gas resources evaluation results show that China's petroleum geological resources are 125.7 billion tons and natural gas geological resources are 90.3 trillion cubic meters, of which 39% of the remaining onshore oil resources and 57% of the remaining natural gas resources are distributed in deep formations. The potential of oil and gas resources is huge. As the development potential of shallow oil and gas reservoirs declines, the development of oil and gas resources gradually develops in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C04B28/04C04B14/06C04B14/28C04B20/00
CPCC04B14/062C04B14/066C04B14/28C04B20/008C04B28/04C04B2111/00724C04B2201/50C04B2201/52C09K8/467C04B14/06C04B2103/50C04B2103/46C04B24/166C04B2103/22
Inventor 王成文王彦集王瑞和郭辛阳郭胜来
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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