High-temperature-resistant well cementation cement system and preparation method thereof

A cementing cement and high-temperature-resistant technology, which is applied in the high-temperature-resistant cementing cement system and its preparation field, can solve the problems of poor long-term strength and poor high-temperature resistance of the cement system, and achieve strength decline, stable performance, and land occupation Effect

Active Publication Date: 2021-11-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a high temperature resistant well cementing cement system and its preparation method in order to overcome the problems of poor long-term strength and poor high temperature resistance of the cement system existing in the prior art

Method used

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  • High-temperature-resistant well cementation cement system and preparation method thereof
  • High-temperature-resistant well cementation cement system and preparation method thereof
  • High-temperature-resistant well cementation cement system and preparation method thereof

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preparation example Construction

[0052] The second aspect of the present invention provides a method for preparing the above-mentioned high temperature resistant cementing cement system, the method comprising the following steps:

[0053] (1) mixing cement, silica sand and fly ash according to the proportioning ratio to obtain solid components;

[0054] (2) mixing water and additives according to the proportion to obtain liquid components;

[0055] (3) Mixing the solid component obtained in step (1) and the liquid component obtained in step (2) according to the ratio to obtain a high temperature resistant well cementing cement system.

[0056] In a preferred embodiment, in step (3), the mixing is stirring and mixing.

[0057] In a preferred embodiment, the specific process of the step (3) is: adding the liquid component obtained in the step (2) into the mold, and then adding the solid component obtained in the step (1) into the liquid under stirring In the components, after the addition is complete, stir an...

Embodiment 1

[0061] The high temperature cementing cement system is composed of solid components and liquid components, and the weight ratio of solid components to liquid components is 1:0.31;

[0062] Wherein, the solid component contains 48.8% by weight of grade G oil well cement (main chemical composition CaO: 65.13% by weight, SiO 2 : 18.45% by weight, Al 2 o 3 : 2.99% by weight), 22% by weight of silica sand (D90=163um) and 29.2% by weight of fly ash k (D90=5.55um, containing 46.111% by weight of SiO 2 and 26.589 wt% Al 2 o 3 );

[0063] The liquid component contains 77% by weight of water, 3% by weight of suspending agent, 6.6% by weight of dispersant, 5.4% by weight of retarder, 7.4% by weight of water loss reducing agent and 0.6% by weight of defoamer .

[0064] The preparation process is as follows:

[0065] (1) mixing cement, silica sand and fly ash according to the proportioning ratio to obtain solid components;

[0066] (2) mixing water and additives according to the pr...

Embodiment 2

[0069] The high temperature cementing cement system is composed of solid components and liquid components, and the weight ratio of solid components to liquid components is 1:0.3;

[0070] Wherein, the solid component contains 52% by weight of G grade oil well cement (main chemical composition CaO: 65.13% by weight, SiO 2 : 18.45% by weight, Al 2 o 3 : 2.99% by weight), 17% by weight of silica sand (D90=163um) and 31% by weight of fly ash s (D90=10.51um, containing 47.057% by weight of SiO 2 and 39.465 wt% Al 2 o 3 );

[0071] The liquid component contains 75% by weight of water, 3.2% by weight of suspending agent, 7% by weight of dispersant, 5.8% by weight of retarder, 8.4% by weight of water loss reducing agent and 0.6% by weight of defoamer .

[0072] The preparation process is as follows:

[0073] (1) mixing cement, silica sand and fly ash according to the proportioning ratio to obtain solid components;

[0074] (2) mixing water and additives according to the propor...

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Abstract

The invention relates to the technical field of well cementation cement preparation, and discloses a high-temperature-resistant well cementation cement system and a preparation method thereof. The system is composed of a solid component and a liquid component, and the weight ratio of the solid component to the liquid component is 1:(0.2-0.9). The solid component contains 25 to 85 weight percent of cement, 4 to 60 weight percent of silica sand and 4 to 60 weight percent of fly ash, and the weight ratio of the silica sand to the fly ash is (0.0714-14):1; and the liquid component contains water and an additive. The cement system not only can solve the problem of strength decline of well cementation cement stone in an ultrahigh-temperature environment, but also can solve the problems of land occupation and environmental pollution caused by fly ash, and promotes high-added-value utilization of industrial solid waste fly ash.

Description

technical field [0001] The invention relates to the technical field of well cement preparation, in particular to a high temperature resistant well cement system and a preparation method thereof. Background technique [0002] At present, Portland cement (including conventional cementing cement) is the most commonly used cementing material in well cementing engineering. With the gradual depletion of shallow oil resources, oil and gas exploration and development are gradually expanding to complex environments such as deep ground and deep water. The number of deep wells and ultra-high temperature deep wells (according to the common concept of international and domestic petroleum industry, refers to wells with a bottom hole temperature higher than 200 °C and a well depth of more than 4500 m) is increasing year by year. The bottom hole temperature of these deep wells can reach more than 200 °C. The ultra-high ambient temperature at the bottom of the well will lead to the decline o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B111/27
CPCC04B28/02C04B2201/50C04B2111/27C04B2111/00724C04B2111/00293C04B14/06C04B18/08C04B2103/0068C04B2103/408C04B2103/22C04B2103/50Y02W30/91
Inventor 庞学玉程国东秦建鲲孙立君
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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