Yingkou Leixuan Refractory Co., Ltd. is a magnesium oxide manufacturer recently using magnesium oxide cement materials to improve the anti-freezing properties of cementing cement. When it drops to zero or below, the moisture in the soil will condense into ice, and the soil will also freeze in Together, a hard layer of permafrost forms. Permafrost (PRF) is present on oil and gas well profiles in West Siberia and the Far North. The test results of cement stone experiments show that after 2~4 cycles of freeze-thaw experiments, the test samples have cracks, spalling, defects and other phenomena. Most of the cement stone samples experienced a maximum of 5 cycles of freeze-thaw, and the strength began to decline. According to this judgment, it is difficult for the cement stone consolidated in the oil well to maintain its long-term integrity. In order to improve the cementing quality of well sections in permafrost, Perm Research Polytechnic University (PNRPU) has developed a new cement consolidation system. This special cement material is based on a highly reactive binder: magnesium oxide. Its greater advantage is that the formed cement stone has excellent frost resistance and can endure 15 cycles of freeze-thaw test.

This kind of cement slurry has the following advantages for cementing in permafrost well sections:

1 Obtain a low density cement slurry.

2. No ice melting occurs in the process of grouting in the casing annulus.

3 The grey-water separation rate of cement slurry is low.

4 Cement slurry has good hardening ability under low temperature conditions, and cement stone has good compressive strength.

5 Cement stone can form adsorption cementation with ice. Therefore, magnesia cement material can be selected for casing cementing through permafrost, and experimental evaluation and industrial testing are carried out according to the conditions of use.