Low temperature low hydration heat cementing cement system

A cementing technology with low heat of hydration, applied in low-temperature surface cementing and onshore permafrost fields, to achieve low water loss, prevent dry shrinkage, and prevent thermal decomposition
CN101328050AInactive Publication Date: 2008-12-24CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2008-12-24
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention relates to a low temperature and low hydration heat cementing concrete system used in the natural gas hydrate layer cementing field. The objective of the invention is to effectively reduce the heat release of the cement hydration, prevent the hydrate from decomposing because of large heat and reduce the harm of the hydrate to the cementing. The whole performance of the cement under the low heat release condition is improved by adding materials which can reduce the whole hydration heat release of the cement using G grade oil well cement as base material. (1) The proper addition of superfine slag with a specific surface area between 6000 and 12000cm2 / g can make sure the strength properties of the early and later stage of the cement. (2) The hydration heat is further reduced by adding fly ash with a lower hydration activity. (3) An amount of gypsum component is added so that the cement paste has certain expansion property at a low temperature to prevent the cement paste shrinking at a low temperature. The low temperature and low hydration heat cementing concrete provided by the invention has an obvious effect for reducing the whole cement hydration heat and a good effect for preventing the deep water hydrate decomposition.
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Description

technical field

[0001] The invention relates to a low-temperature and low-heat-of-hydration cementing cement system used in the field of natural gas hydrate layer cementing, which is a low-temperature and low-heat-of-hydration cementing system suitable for deep-water hydrate layers, and can also be applied to Onshore permafrost and low temperature surface cementing. Background technique

[0002] Today, with the increasing shortage of mineral energy on the earth, the status of natural gas hydrate as a strategic energy source in the 21st century has become increasingly prominent, and it will bring new hope for human beings to provide alternative energy sources. It is estimated that the total amount of natural gas contained in natural gas hydrates in the world is about 1.8ร—10 16 ~2.1ร—10 16 m 3 , which is equivalent to twice the total carbon content of proven traditional fossil fuels in the world. Western developed countries such as Europe, America and Japan are competing to ...

Claims

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