Shale gas horizontal well cementating cement and shale gas horizontal well cementating cement paste

Abstract

The invention relates to shale gas horizontal well cementating cement and shale gas horizontal well cementating cement paste. The shale gas horizontal well cementating cement is prepared from cement clinker and gypsum. In percentage by weight, the cement clinker is prepared from the following mineral compositions: 40-55% of tricalcium silicate, 25-40% of dicalcium silicate, and 15-25% of tetra calcium aluminoferrite. The shale gas horizontal well cementating cement is capable of solving a problem in a shale gas horizontal well cementating project that set cement is brittle failure, a preparation method is simple and easy to operate, the current shale gas horizontal well cementating cement can be replaced, and the shale gas horizontal well cementating cement is beneficial to the structuraldurability and safety of the shale gas horizontal well cementating project.

Description

technical field [0001] The invention relates to the field of cement preparation, in particular to a shale gas horizontal well cementing cement and a shale gas horizontal well cementing cement slurry. Background technique [0002] At present, the general-purpose cement is Portland cement series, which is made of appropriate raw materials, designed with appropriate ratio and composition, and processed through the process of "two grindings and one burning". It is the most widely produced and used hydraulic cementitious material. . For a long time, the chemical composition and mineral composition of Portland cement have basically remained unchanged, and the technological development is mainly the production process and equipment. [0003] At present, the demand and supply of my country's oil and gas resources show a trend of "two increases and one decrease" in which the demand and foreign dependence are increasing year by year, and the amount of shallow easy-to-use oil and gas ...

AI Technical Summary

Problems solved by technology

However, because the calcium-silicon ratio of the G-grade cement mineral composition determines the brittleness of the hydration product under the combined action of large fracturing load and temperature, resulting in structural instability, the simple addition of external admixtures can meet the cementing requirements, but Insufficient long-term durability of the cement sheath, affecting oil and gas well recovery

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