High-intensity and high-temperature-resistant anti-erosion oil well cement and preparation method thereof

Abstract

The invention discloses high-intensity and high-temperature-resistant anti-erosion oil well cement and a preparation method thereof. The high-intensity and high-temperature-resistant anti-erosion oilwell cement is mainly prepared from the following ingredients in percentage by mass through mixing: 50 to 60 percent of grade G high-resistant oil well clinker, 10 to 15 percent of aluminophosphate cement clinker, 20 to 30 percent of unbonded silica sand, 4.0 to 6.0 percent of phosphogypsum, 3.5 to 5.5 percent of silicon powder, 0.05 to 0.2 percent of fluid loss agents and 0.3 to 0.5 percent of retarders. Through the reasonable formula, on the basis of improving the cement intensity (under the conditions of 24h normal pressure and 300 DEG C, the intensity can reach a value being 53.0MPa or more), the thickening time (such as 90 to 120 min) can be effectively controlled; in addition, no special retarder and the like is added, so that the high-temperature-resistant performance of the cementis obvious; the use temperature can reach 300 DEG C; at 300 DEG C, the intensity is not influenced; a test body is complete and not damaged.

Description

technical field [0001] The invention relates to a high-strength, high-temperature-resistant, anti-erosion oil well cement and a preparation method thereof, belonging to the technical field of special cement preparation. Background technique [0002] Oil well cement is widely used in the exploration and production of oil and natural gas. During the construction process, oil well cement is mainly used as an annular seal between the inner wall of the borehole and the steel casing to separate the area with high pressure from the area with low pressure. Drilling success plays an important role. With the improvement of drilling technology and the increase of difficulty in oilfield production, drilling has developed into deep wells, ultra-deep wells, and complex wells. The temperature and pressure at the bottom of the well have increased significantly, and the environment at the bottom of the well has become worse. Oil well cement slurry thickens rapidly, which cannot meet the req...

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Problems solved by technology

With the improvement of drilling technology and the increase of difficulty in oilfield production, drilling has developed into deep wells, ultra-deep wells, and complex wells. The temperature and pressure at the bottom of the well have increased significantly, and the environment at the bottom of the well has become worse. Oil well cement slurry thickens rapidly, which cannot meet the requirements of cementing construction. In severe cases, it will lead to "whole pump" accidents, which will bring huge property losses to the oil field. Moreover, under high temperature and high pressure, the physical and chemical properties of cement slurry will change significantly. , there are situations such as low temperature resistance, insufficient strength, and corrosion resistance, which will affect the cementing quality

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