High-temperature well cementing cement and high-temperature well cementing cement grout

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 >...

AI Technical Summary

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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