CAJ | 학술논문

由橡胶组成的封隔器胶筒是封隔器的核心部件，其性能直接关系到封隔器密封性能的好坏。CO2驱注气井中，CO2对橡胶材料的腐蚀易导致封隔器密封失效，进而引起环空带压，危及注气井的安全生产。为此，借助高温高压釜模拟井底真实环境进行了丁腈橡胶和氢化丁腈橡胶两种材料的腐蚀试验，分析比较了气相和液相腐蚀条件下橡胶腐蚀后材料力学性能和腐蚀形貌的变化。研究表明，丁腈橡胶和氢化丁腈橡胶在腐蚀后其拉伸性能均明显下降，硬度也有一定降低，液相环境下的腐蚀较气相环境下的腐蚀更加严重。因此，在工程设计中应充分考虑实际工况对橡胶力学性能的影响，不应以原始状态下橡胶的力学性能为依据。该研究成果可为CO2驱注气井及其他同类气井封隔器胶筒材料的选择提供参考。
유상효조성적봉격기효통시봉격기적핵심부건，기성능직접관계도봉격기밀봉성능적호배。CO2구주기정중，CO2대상효재료적부식역도치봉격기밀봉실효，진이인기배공대압，위급주기정적안전생산。위차，차조고온고압부모의정저진실배경진행료정정상효화경화정정상효량충재료적부식시험，분석비교료기상화액상부식조건하상효부식후재료역학성능화부식형모적변화。연구표명，정정상효화경화정정상효재부식후기랍신성능균명현하강，경도야유일정강저，액상배경하적부식교기상배경하적부식경가엄중。인차，재공정설계중응충분고필실제공황대상효역학성능적영향，불응이원시상태하상효적역학성능위의거。해연구성과가위CO2구주기정급기타동류기정봉격기효통재료적선택제공삼고。
As the core part of the packer ,packer rubber has direct relationship with the sealing function of packer .CO2 corrosion on the rubber material can cause sealing failures and induce sustained casing pres-sure ,thus affecting the safety of production of a CO2 injection well .Corrosion experiments were conducted on NBR and HNBR under simulated environment in high temperature high pressure autoclave .Compari-sons were made on the mechanic performances and shape of the rubber materials through corrosion of gas and liquid phase .Results showed that the tensile properties of nitrile rubber and HNBR decreased signifi-cantly and the hardness was also reduced after corrosion .The corrosion in the liquid phase environment was much more severe than that in the gaseous phase environment .Effects of actual conditions on the mechanic performances of rubber materials ,instead of the mechanical performance under its initial state ,should be considered in making engineering design .The research results can provide references for the selection of rubber material in CO2 injection well .