Abstract
Cross-linked polymer gels are a new type of temporary plugging agent and are mainly used to control the leakage of fluid during drilling, completion, and workover operations. Improving the mechanical strength and plugging performance of these materials enables them to resist tough wellbore conditions (e.g., high pressure and high temperature). In this study, various concentrations and size of silica nanoparticles are introduced into the sulfonated polyacrylamide (SPAM)/chromium (III) acetate system to produce a nanocomposite with enhanced mechanical properties. First, the rheological behavior of gelant and viscoelastic properties of synthesized nanocomposites are investigated. Then, the surface chemistry and morphology of the synthesized gels is evaluated by Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FESEM), respectively. Finally, the maximum sealing differential pressure for gels for temporary plugging of a wellbore is measured by applying differential pressure across the nanocomposite gel in a designed set-up. The results showed that the precrosslinking reaction and the gelant viscosity are directly related to the size and concentration of the silica nanoparticles as well as the wellbore temperature. Moreover, it is demonstrated that nanocomposites containing 20–30 nm sized particles have a higher mechanical strength and plugging capability in comparison to composites containing silica particles with sizes of 7–10 and 60–70 nm.
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We thank Dr. Marjan Ashrafizadeh for her great assistance with the interpretation of our results, Dr. Maral Ghahramani for comments that improved the manuscript, and the anonymous reviewers for their helpful comments and suggestions.
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Azimi Dijvejin, Z., Ghaffarkhah, A., Sadeghnejad, S. et al. Effect of silica nanoparticle size on the mechanical strength and wellbore plugging performance of SPAM/chromium (III) acetate nanocomposite gels. Polym J 51, 693–707 (2019). https://doi.org/10.1038/s41428-019-0178-3
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DOI: https://doi.org/10.1038/s41428-019-0178-3
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