Experimental and theoretical study of the restrained shrinkage cracking of early age well cement

Zhang, Yige; Li, Linfei; Xi, Yunping; Hubler, Mija

doi:10.1016/j.conbuildmat.2020.120368

Title: Experimental and theoretical study of the restrained shrinkage cracking of early age well cement

Journal Article · Tue Sep 01 00:00:00 EDT 2020 · Construction and Building Materials

DOI:https://doi.org/10.1016/j.conbuildmat.2020.120368· OSTI ID:1849177

Zhang, Yige ^[1]; Li, Linfei ^[1]; Xi, Yunping ^[1]; Hubler, Mija ^[1]

Univ. of Colorado, Boulder, CO (United States)

The shrinkage cracking occurring in oil & gas well cement material is a major factor that reduces the cement sheath integrity and impairs the durability of an underground well. Shrinkage mainly takes place in the early hydration period of the cement, and the resulting restrained shrinkage cracking can form a leaking network for oil & gas or carbon dioxide stored in an underground reservoir. It is thus important to understand the early age behavior of well cement and the leaking pathway formation in the well. This study describes the application of the digital image correlation (DIC) method as a tool to measure the strain development and crack distributions of well cement in the lab during early phase changes. A theoretical model is presented to calculate the stress distribution built up in the cement sheath during early ages of well cement hydration, which helps to interpret the experimental observations and determine the major factors influencing the cracking sequences. This study presents the whole hydration – drying shrinkage – and cracking mechanism of early age well cement under restrained ring conditions experimentally and theoretically. Finally, the results offer useful insights on the key material and geometric parameters which control the fracture of a well cementing structure.

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Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0026514

OSTI ID:: 1849177

Alternate ID(s):: OSTI ID: 1765445

Journal Information:: Construction and Building Materials, Vol. 262, Issue C; ISSN 0950-0618

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Experimental and theoretical study of the restrained shrinkage cracking of early age well cement

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