Phase Composition Control and Mechanical Property of New Oil Well Cement

Abstract

Abstract: In order to solve the problem of damage and failure of cementing ring during shale gas exploitation, the ratio of raw materials through mineral composition was calculated and adjusted. The oil well cement phase composition control research was studied by lithofacies, XRD analysis and scanning electron microscopy tests. And the mechanical properties of cement with different mineral compositions and related hydration products were explored. The results show that the compressive and flexural strength of the developed new oil well cement reach 45.3 MPa and 8.9 MPa for 7 d, 54.2 MPa and 9.6 MPa for 28 d, respectively. The 7 d elastic modulus is reduced to 7.1 GPa, which is 14.4% lower than that of G grade oil well cement, showing more excellent mechanical properties. Through microscopic analysis, it is concluded that the mechanism of the enhancement of the mechanical properties of the new oil well cement is due to the change in the mineral composition, which produces more C-S-H gel in the hydration product. At the same time, the increase in the content of the iron phase also produces more iron (aluminum)-rich gels, forming a tight bridge structure between the hydration products, and the overall structure is more compact. The new type of oil well cement has better compressive strength, flexural strength and toughness than G grade oil well cement, which has important reference value for the safe and efficient exploitation of shale gas.

Key words: G grade oil well cement, mineral composition, shale gas cementing, mechanical property, microcosmic mechanism

CLC Number:

TE256

NI Xiucheng, CHENG Xiaowei, LI Junwu, WANG Jing, GAO Xianshu, ZHANG Gaoyin, ZHANG Chunmei, LIU Kaiqiang. Phase Composition Control and Mechanical Property of New Oil Well Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2534-2545.

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