为考察酸压工况对橡胶密封圈的损伤程度,以氢化丁腈橡胶O型圈为对象,通过高温高压釜模拟现场高温高压高含酸液介质工况,以截面积变化率、拉伸性能、硬度、压缩永久变形、宏观形貌变化和密封装置变化情况为指标,对其在酸压工况下的腐蚀损伤进行了试验评价。试验结果表明:腐蚀试验后,氢化丁腈橡胶O型圈截面积增大、物理性能出现一定程度的下降,有变形、鼓胀、表面破损的现象发生,自由状态下O型圈腐蚀损伤程度大于承压状态。研究结果表明，氢化丁腈橡胶O型圈在试验周期范围内具有一定密封性能,长期服役时存在密封失效的风险。研究结果可为酸化压裂工况下的氢化丁腈橡胶密封体的选用提供技术参考。

 In order to investigate the degree of damage of rubber sealing rings under the acid fracturing condition, an experiment was carried out using HNBR O-ring in a High-Temperature High-Pressure strong acidic medium in an autoclave. The performance indicators included the rate of change of cross-sectional area, tensile properties, hardness, permanent deformation after compression, change in macro morphology and sealing properties. The experiment results showed that with the increase of cross-sectional area of the HNBR O-ring, its physical properties degenerated, and deformation, swelling and surface damage were detected after the corrosion test. The degree of corrosion damage of the O-ring in free state was more severe than that under pressurized conditions. The results showed that the HNBR O-ring has certain sealing performance within the test period, but there is a risk of sealing failure in long-term service. The study results can be used as a basis and reference for the selection of HNBR sealing ring in acidic fracturing service condition.