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High-strength low-hydration-heat well cementation cement and preparation method thereof

A low hydration heat, cementing technology, which is applied in chemical instruments and methods, cement production, drilling composition, etc. It is difficult to develop and achieve satisfactory results, etc., to achieve the effect of improving the cement hydration process, reducing the peak hydration heat release and the total amount of heat release, and improving the arrangement and folding method.

Active Publication Date: 2021-08-06
JIAHUA SPECIAL CEMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To solve the above-mentioned large temperature difference cementing problem, generally add a large amount of high-temperature retarder and early strength agent to ensure the retardation of the high-temperature section at the bottom of the middle well and the low-temperature section of the upper well The early strength of cement, but the effect is not satisfactory. This is because the addition of high-temperature retarder will cause serious retardation or even super retardation of the cement slurry at the top of the well, which will inhibit the effect of early strength agent and seriously Weaken the strength development of the cement stone at the top of the well, and even affect the cementing quality of the long sealing section, seriously affecting the safety of the cementing operation and the progress of subsequent operations
[0006] For the low-density cementing slurry in the long sealing section, due to the high water-cement ratio and low cement ratio, G is often used to improve the early strength. Grade or A grade oil well cement is used as the basic cementitious material. The early hydration heat of this material is high, and the hydration heat is one of the factors affecting the volume stability of the cement sheath. When the cement hydration heat is too high, the cement stone itself will expand when heated. , but with the diffusion of heat inside the cement sheath, when the temperature tends to be consistent with the surrounding environment, the cooling process will cause the cement sheath to shrink, thereby affecting the cementing quality of the interface between the cement sheath. It is difficult to solve the high-temperature and large-temperature-difference cementing problem in the long-sealing section with high-grade cementing cement, and it is urgent to develop new cementing cement to solve the above-mentioned cementing problems

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  • High-strength low-hydration-heat well cementation cement and preparation method thereof
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  • High-strength low-hydration-heat well cementation cement and preparation method thereof

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Embodiment 1

[0046] As a preferred embodiment of the present invention, in this embodiment, in each high-strength low-heat-of-hydration cementing cement, 73 parts by weight of low-heat-of-hydration cementitious materials were weighed, and the low-heat-of-hydration cement used was Coagulation material is made of C 2 The highly active Portland cement clinker, zircon and baddeleyite with S content greater than 40% are fully mixed and ground according to the set ratio, and the mineral content is: 30%~45% C 2 S, 30%~45% C 3 S, 0.2%~1.5% C 3 A. 10%~16% of C 4 AF, 1%~10% ZrSiO 4 ; Specific surface area ≥ 350m 2 / kg, SO 3 ≤3%. In parts by weight, take 15 parts of low-hydration active materials, the low-hydration active materials are selected from one or more mixtures of metal slag and ultrafine fly ash, and the metal slag is steel slag, manganese slag and copper slag. One or a combination of several, the physical properties of the low-hydration active material meet: specific surface area ≥ ...

Embodiment 2

[0055] As another preferred embodiment of the present invention, in this embodiment, the high-strength and low-heat of hydration cementing materials used in each high-strength and low-heat of hydration cement are made of low-heat of hydration Portland cement clinker, zirconium The quartzite and baddeleyite are weighed according to the ratio of 80:12.5:5, and then fully mixed and ground. The mineral content is: 30%~45% C 2 S, 30%~45% C 3 S, 0.2%~1.5% C 3 A. 10%~16% of C 4 AF, 1%~10% ZrSiO 4 ; Specific surface area ≥ 350m 2 / kg, SO 3 ≤3%; the low-hydration active material is a mixture of one or more of metal slag and ultra-fine fly ash, and the physical properties of the low-hydration active material meet: specific surface area ≥ 500m 2 / kg, SO 3 ≤3%. Metal slag is one or a mixture of steel slag, manganese slag and copper slag. The reinforcing agent is composed of a certain amount of calcium sulfate whiskers, ultrafine ceramics and graphene oxide powder, with a specific ...

Embodiment 3

[0063] As another preferred embodiment of the present invention, the high-strength and low-heat-of-hydration cement is prepared in this embodiment, which contains the following components in parts by weight:

[0064] Weigh two parts of high-strength and low-heat of hydration cementing cement in sequence, by mass percentage, 73% of finely ground high-strength and low-heat of hydration cementitious material, 15% of low-hydration active material, 6% of reinforcing agent, and anti-shrinkage agent 5%, early strength agent 1%; the above-mentioned five components are weighed in turn and mixed uniformly to obtain high-strength, low-density, low-heat-of-hydration cement.

[0065] The high-strength, low-density and low-hydration heat cementing cement obtained according to the above configuration is configured with conventional density cementing cement slurry and the density is 1.50g / cm 3 The low-density cementing slurry; the water-cement ratio of the conventional density cement slurry i...

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Abstract

The invention discloses high-strength low-hydration-heat well cementation cement, and relates to the technical field of well cementation materials used for oil exploration and development. The high-strength low-hydration-heat well cementation material comprises the following components in percentage by mass: 65%-81% of a high-strength low-hydration-heat wellcementation material, 10%-20% of a low-hydration-heat active material, 4-8% of a reinforcing agent, 4-6% of an anti-shrinking agent and 0.5-1.5% of an early strength agent. The high-strength low-hydration-heat well cementation cement is suitable for long-sealing high-temperature large-temperature-difference stratums, well cementation construction safety of long-sealing high-temperature large-temperature-difference low-pressure leaky stratums is guaranteed, high efficiency and exploitation safety of oil and gas resources are improved, and the national requirements for deep and ultra-deep oil and gas resources are met.

Description

technical field [0001] The invention relates to the technical field of cementing materials used in petroleum exploration and development, in particular to the technical field of fully sealed high-temperature and large-temperature-difference cementing materials, and more specifically to a high-strength, low-hydration heat cement and a preparation method thereof. Background technique [0002] China is a typical large energy production and consumption country. With the continuous development of social economy, the demand for oil resources is also increasing. Due to the exhaustion of shallow oil and gas resources, all major domestic oil fields have carried out exploration and development in deep formations. , which is conducive to slowing down the short-term situation of China's oil and gas resources and providing a strong energy guarantee for the sustained and healthy growth of the Chinese economy. [0003] At present, in the development process of domestic deep wells and ultra...

Claims

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Application Information

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IPC IPC(8): C04B7/19C04B7/26C04B7/36C09K8/467
CPCC04B7/19C04B7/26C04B7/36C09K8/467Y02P40/10
Inventor 刘欢曾雪玲古安林
Owner JIAHUA SPECIAL CEMENT
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