Li Jia, Wen Ming, Liu Shuang, Liu Qiang
Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610213, People's Republic of China.
PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610051, People's Republic of China.
ACS Omega. 2023 Sep 22;8(39):36207-36217. doi: 10.1021/acsomega.3c04663. eCollection 2023 Oct 3.
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 (). 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.
由于高温气井钻井或修井作业的成功率较低，以香草醛、琥珀酸酐（SA）、纤维素和乙酰丙酮锌水合物（AZH）为催化剂合成了一种新型生物基临时密封材料。红外分析证明了香草醛衍生环氧树脂的合成以及含羟基酯的玻璃态物质的形成。热力学性能测试结果表明，它具有优异的热稳定性，玻璃化转变温度较高。动态力学测试结果表明，该材料在120℃时的特征弛豫时间为3500秒，自愈合率在20分钟内可达到61%。力学性能测试结果表明，在10MPa压力下，它具有良好的弹性变形性能，回弹率超过36%，破碎率小于17%。降解性能结果表明，在120℃和1.2%NaOH条件下，分解率增至80%。综合性能评价结果表明，新型临时堵漏材料具有良好的相容性，其堵漏性能优于凝胶、复合材料和形状记忆聚合物。最大裂缝堵漏能力为5×4mm，压力可达10MPa。
