利用自主设计的水合物抑制剂评价装置，分析比较了蒸馏水及气田高盐水环境中水合物的形成规律，重点评价了高盐水环境中PVP、NVC、Poly （VP/VCap）、PVCap 4种抑制剂的使用效果。结果表明，压力为7.0 MPa，温度为3℃的条件下，蒸馏水环境中水合物的形成时间为16 min；而高盐水环境中水合物的形成时间为45 min。质量分数为2.0%时，上述4种抑制剂在高盐水环境中的有效抑制时间分别为300、350、> 1 100、> 1 100 min；其中PVCap在质量分数为0.5%时抑制时间就超过1 100 min，其抑制性能最优，满足现有气田工艺要求。高盐水环境有利于抑制剂发挥抑制效果。动力学型抑制剂具有加量少、毒性低的优点。

The forming rules of hydrates respectively in distilled water and in high salinity water of natural gas field are analyzed and compared by means of the self-designed evaluation instruments for hydrate inhibitor.The usage effects of four inhibitors including PVP,NVC,Poly(VP/VCap),and PVCap in high salinity water are studied emphatically.The results show that under 276.15 K and 7.0 MPa,it spends 16 min forming hydrate in distilled water,and spends 45 min in the high-salinity water from natural gas field.When the concentration is 2.0%,the effective inhibition time of four inhibitors are 300 min,350 min, > 1100 min,and > 1100 min,respectively.Of which,the inhibitor time of PVCap exceeds 1100 min even if its concentrate is as low as 0.5 wt%.Therefore,PVCap has the strongest inhibition ability and can meet the process requirements from existing natural gas fields.High salinity water situation is helpful for inhibitor to play the inhibiting role.Kinetic inhibitor has the advantages of low-dosage and low toxicity.