Relationship Between Water States and Electrical Conductivity of Cement Slurry in Early Hydration

doi:10.11885/j.issn.1674-5086.2019.01.21.02

Abstract

Abstract: In the cementing of oil and natural gas wells "short-term gas migration" is usually happened during the liquid-solid transition stage of the cement slurry. Understanding the process of cement hydration during this stage is the key to study the mechanism of "short-term gas migration". And electrical conductivity is one of effective method to investigate the hydration degree and microstructure of cement slurry. Therefore, the conductivity measurement instrument was applied to investigate the effects of the stability, hydration rate of the cement slurry on its electrical conductivity. Meanwhile, combining the principle of mass conservation and low-field nuclear magnetic resonance (LF-NMR), the relationship between the water states and electrical conductivity of the cement slurry was investigated. The experimental results showed that the initial electrical conductivity of the cement slurry was determined by the concentration of the pore solution and pore structure in the cement slurry. And the pore structure distribution was more uniformed with increasing stability of the cement slurry, which increases the initial electrical conductivity of the cement slurry from 16.8 mS/cm to 19.4 mS/cm. Moreover, with hydration degree increases a large amount of hydration products form on the surface of cement particles and in pores to change the solid-phase microstructure and pore structure of the cement slurry. It made the free water distributed in large pores change to capillary water or gel water in small pores. Finally, the experimental results show that it can be seen that the electrical conductivity is proportional to the content of free water, evaporable water in the cement slurry.

Key words: well cementation, cement slurry, electrical conductivity, hydration, microscopic structure, free water

CLC Number:

TE256
TE39

LI Bin, CHEN Sha, GUO Jianhua, LIU Kaiqiang, CHENG Xiaowei. Relationship Between Water States and Electrical Conductivity of Cement Slurry in Early Hydration[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 153-160.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2019.01.21.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2020/V42/I3/153

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