Preparation and Characterization of a Biobased Temporary Plugging Material: Self-Healing and Degradable

Abstract

Due to the low success rate in high-temperature gas well drilling or workover operations, a new type of biobased temporary sealing material was synthesized using vanillin, succinic anhydride (SA), cellulose, and acetylacetone zinc hydrate (AZH) as catalysts. Infrared analysis proved the synthesis of vanillin-derived epoxy and the formation of a vitrimer with hydroxyl ester. The results of thermodynamic properties tests show that it has excellent thermal stability with a high glass transition temperature (T g). The dynamic mechanical test results show that the characteristic relaxation time of the material at 120 °C is 3500 s and the self-healing rate can reach 61% within 20 min. The test results of mechanical properties show that under 10 MPa pressure, it has good elastic deformation performance, the rebound rate is more than 36%, and the crushing rate is less than 17%. The degradation performance results show that the decomposition increases to 80% under 120 °C and 1.2% NaOH. The comprehensive performance evaluation results show that the new temporary plugging material has good compatibility, and its plugging performance is better than those of a gel, composite material, and shape memory polymer. The maximum fracture plugging capacity is 5 × 4 mm, with a pressure up to 10 MPa.

Novel Lignin‐Functionalized Waterborne Epoxy Composite Coatings with Excellent Anti‐Aging, UV Resistance, and Interfacial Anti‐Corrosion Performance

“…There were few reports on the direct use of lignin as a nano‐filler to improve the protective properties of waterborne epoxy coatings, and the additives that only use lignin as a functional filler fail to give full play to the multifunctionality of lignin. [ 9,28,29 ] Therefore, based on our previous work, we modified LS to prepare it into nanomaterials to further enhance its corrosion inhibition properties and protective properties of coatings. Meanwhile, lignin had excellent UV‐blocking performance due to the presence of a large number of color‐generating and color‐enhancing groups in its structure, which can be combined with aromatic rings to form large conjugated π systems.…”