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Carbon Dots Grafted Polymer for High Temperature Retardation in Deep Oil Well Cementing Slurry
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DOI：10.1016/j.cemconcomp.2026.106654.png)
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Abstract
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Oil and gas extraction from deep and ultra-deep reservoirs faces challenges due to extreme temperatures and complex geology, particularly during drilling and cementing. In this study, we leverage the inheritable, bottom-up preparation pathway of carbon dots to screen appropriate carbon sources and synthesize zero-dimensional carbon dots (CDs) with polyhydroxy-carboxyl functional structures. Following chemical modification, CDs co-polymerize with the polymeric monomer to form CD@P, imparting a tentacle-like architecture to the polymer. In complex cement slurry systems, the introduction of CD@P effectively delays the final setting time at high temperatures. CDs enhance the adsorption capacity of the polymer, significantly improving high-temperature retarder performance without compromising cement slurry properties. The economical and scalable design and systematic implementation of the CD@P preparation process provide a promising avenue for future ultra-deep oil and gas exploration and development.
Keywords:
Carbon dots
Polymer modification
High-temperature retardation
Deep oil well cementing
Cement slurry properties
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