High-temperature-resisting thermal recovery cement and preparation method thereof

Abstract

The invention discloses high-temperature-resisting thermal recovery cement and a preparation method thereof. The thermal recovery cement comprises the following components in parts by weight of 55-65 parts of aluminate cement grog, 10-30 parts of phosphorite dregs, 10-30 parts of slags, 1-3 parts of ceramic fibers and 1-3 parts of rubber powder. The preparation method comprises the following steps of weighing the aluminate cement grog, the phosphorite dregs and the slags, mixing so as to obtain a mixing powder body, pouring the mixing powder body into a ball mill for grinding until the specific surface area of 250-300m<2> / kg is achieved, adding the ceramic fibers and the rubber powder, and stirring for ten minutes in a mixing manner to obtain the high-temperature-resisting thermal recovery cement. The high-temperature-resisting thermal recovery cement and the preparation method thereof provided by the invention have the advantages that an engineering property of the thermal recovery cement is easy to regulate, and the intensity is high under the low temperature; for a cement stone made of the thermal recovery cement, an excellent high temperature resistance property is realized, the intensity is not decayed when the formed hardened cement is subjected to the high temperature, the permeability is not increased, the thermal recovery cement has the certain tenacity, the well-cementing requirement of a thick oil thermal production well is met, a principle of the preparation method is reliable, the operation is simple and convenient, and the production cost is low.

Description

technical field [0001] The invention relates to a thermal recovery cement used in heavy oil thermal recovery well cementing in oil and gas exploration and development and a preparation method thereof. Background technique [0002] Heavy oil resources account for more than 70% of the world's remaining oil resources, and its reserves have far exceeded conventional crude oil. Heavy oil recovery is dominated by thermal oil recovery. During thermal oil recovery, the steam temperature is usually as high as 300°C to 350°C, and when the oil layer is burned, the temperature will exceed 400°C. At such a high temperature, the compressive strength of the oil well cement sheath around the wellbore declines, the permeability increases, the stability and homogeneity are destroyed, and the high temperature resistance performance declines sharply. The currently used cementing cement system for heavy oil thermal recovery wells is mostly to add external admixtures to the cement to solve the h...

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Problems solved by technology

At present, most of the cementing cement systems used in heavy oil thermal recovery wells add external admixtures to the cement to solve the defects of high temperature resistance of the cement itself. However, the cement system still suffers from a sharp decline in high temperature strength, The phenomenon of increased permeability seriously affects the production life of heavy oil thermal recovery wells, so it is of great significance to improve the high temperature resistance of cement itself

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