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High temperature cementing cement and high temperature cementing slurry

A cement slurry and cement technology, which is applied in the field of cement, can solve the problems of insufficient long-term durability of cementing cement sheath, structural instability, and impact on oil and gas well recovery rate.

Active Publication Date: 2021-01-26
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology

Because the calcium-silicon ratio of G-grade cement minerals determines the unstable crystal form of hydration products at high temperatures, resulting in structural instability, simple addition of external admixtures can meet the cementing requirements, but the long-term stability of the cement sheath Insufficient durability, which affects oil and gas well recovery

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Embodiment Construction

[0036] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, and characteristics of the high-temperature cement and high-temperature cement slurry proposed in the present invention will be described below in conjunction with the preferred embodiments. And its effect, detailed description is as follows. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0037] A kind of high-temperature cementing cement that one embodiment of the present invention proposes comprises cement clinker and gypsum; The mineral composition of described cement clinker, by weight percentage, it comprises:

[0038] Tricalcium silicate: 30-40%;

[0039] Dicalcium silicate: 45-60%...

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Abstract

The invention relates to high-temperature well cementing cement and high-temperature well cementing cement grout. The high-temperature well cementing cement comprises cement clinker and gypsum, wherein the cement clinker comprises the following mineral components in percent by weight: 30-40% of tricalcium silicate, 45-60% of dicalcium silicate, 1-4% of tricalcium aluminate and 10-20% of tetracalcium aluminoferrite. Through optimization and matching of the mineral composition of a cement base material, the contents of the tricalcium silicate, the dicalcium silicate, the tricalcium aluminate andthe tetracalcium aluminoferrite as cement components are adjusted, so that the hydration progress of the cement better meets the high-temperature well cementing need; the high-temperature well cementing cement can effectively solve the problem of decay of high-temperature strength of set cement in deep and ultradeep well cementing engineering; the preparation method is simple and easy to obtain,can replace the existing high-temperature well cementing cement and the existing well cementing cement grout system can be replaced; the structural durability and the structural safety in high-temperature complex deep well cementing engineering are facilitated.

Description

technical field [0001] The invention relates to the cement field, in particular to a high-temperature cementing cement, a preparation method and a high-temperature cementing cement slurry. Background technique [0002] With the continuous development of my country's economy, the demand for oil will increase. The exploration, development, production, supply and safety of oil and natural gas are directly related to the lifeline of the country's economic development. With the complexity and depth of the geological environment for oil and natural gas extraction, and the continuous increase in the structure and temperature and pressure of underground rock formations, the extraction of oil and gas resources in complex geological environments is considered to be an important frontier of the oil industry, and it is a field that countries all over the world are competing for. Strategic commanding heights. In my country, deep (burial depth 3500-4500m) and ultra-deep (burial depth >...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/04C04B7/19C04B7/24C04B28/04C09K8/46
CPCC04B7/04C04B7/19C04B7/24C04B28/04C04B2111/00724C09K8/46C04B24/383C04B24/06C04B2103/22Y02P40/10
Inventor 高显束王晶文寨军王敏张坤悦马忠诚
Owner CHINA BUILDING MATERIALS ACAD
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