Developing a Technological Means of Obtaining Superior Properties and Quality for Quenched and Forged Structural Steels

Зайцев, А. И.; Karamysheva, N. A.; Nikonov, S. V.; Koldaev, A. V.; Kazankov, A. Yu.

doi:10.1007/s11015-016-0196-8

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“…Therefore, despite the danger of magnesia corrosion in relation to Portland cement, even with a small amount of magnesium, a sufficiently large number of wells under these conditions are cemented by this grouting material. The main aggressive component in the corrosion of cement stone in contact with magnesium salts or their aqueous solutions is magnesium cation (Zaitsev et al, 2016;Xu et al, 2017a;Xu et al, 2017b). As a result of chemical reactions of components of an aggressive environment with cement hydration products, and first of all with calcium hydroxide located in the pore fluid, reaction products are formed that are either removed from the cement stone as a result of diffusion or, precipitating, remain in its pores.…”

Section: Introductionmentioning

confidence: 99%

Magnesia Corrosion of Grouting Materials

Agzamov¹,

Kabdushev²,

Tokunova³

et al. 2020

PTQ

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The issue of magnesia corrosion of grouting materials in oil and gas wells is very relevant in the construction of oil and gas wells since magnesia salts can lead to the destruction of Portland cement-based cement stone within few months. When fastening powerful intervals of salt deposits represented by magnesium salts, the use of magnesia cements is effective. However, individual layers and interlayers containing dissolved magnesium salts are not individually cemented, but overlap over the entire interval of the open hole with cement Portland cement, which can be destroyed due to magnesia corrosion. The main aim of the paper is to analyze the corrosion of Portland cement stone in aggressive environments of magnesia. As the quantitative indicators characterizing the degree of stone damage, the thickness of the damaged layer and the stone resistance coefficient are taken, characterized by the ratio of the compressive strength or bending strength of stone samples after being in an aggressive environment to the strength of control samples at the same hardening time. The corrosion resistance of cement stone was assessed after 8 weeks in an aggressive magnesia environment. Also, the role of MgCl2 concentration on the mechanism of corrosion damage to cement stone was studied. The use of reducing the water-cement ratio and adding palygorskite clay to reduce the porosity of cement stone and reduce the rate of corrosion damage is proposed. The kinetics and the main factors affecting the corrosion process were considered, an X-ray diffraction analysis of corrosion products and unaffected cement stone was carried out.

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Section: Introductionmentioning

confidence: 99%