| 摘要: |
| 采用高温高压釜和自主设计的O型圈承压状态模拟装置模拟某高含CO2介质天然气生产井井筒工况,在总压30 MPa、CO2分压0.5 MPa、温度140 ℃的条件下,分别在承压状态下和自由状态下对四丙氟橡胶O型圈进行了高温高压腐蚀实验。以O型圈试样的拉伸、硬度和压缩永久变形为考察指标,分析了腐蚀前后试样的力学性能损伤规律。研究结果表明,四丙氟橡胶O型圈在模拟工况下服役后力学性能下降,承压状态下橡胶材质的腐蚀损伤比自由状态的损伤程度小,气相环境中的腐蚀比液相环境严重,实验结果呈现出较好的规律性,建议将模拟井筒承压状态下橡胶材质的力学性能衰减程度作为腐蚀损伤的主要考察指标进行材质优选。 |
| 关键词: 四丙氟橡胶 O型圈 腐蚀 承压状态 力学性能 |
| DOI：10.3969/j.issn.1007-3426.2018.04.015 |
| 分类号: |
| 基金项目:国家自然科学基金“静载、振动与腐蚀作用下H2S/CO2气井完井管柱螺纹密封面的力化学损伤机制研究”(51774249)；国家科技重大专项“低丰度致密低渗油气藏开发关键技术”(2016ZX05048) |
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| Corrosion mechanism of terafluoroethylene-propylene rubber O-ring in simulated wellbore condition |
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Wang Jinchang1,2, Deng Xuefeng1,2, Zeng Dezhi2, Yu Zhiming2, Li Tan3, Qi Yadong2
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1. Petroleum Engineering Technology Institute of Sinopec North China Petroleum Bureau, Zhengzhou, Henan, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China;3. CNOOC Changzhou Paint and Coatings Industry Research Institute,Changzhou,Jiangsu,China
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| Abstract: |
| Using HTHP dynamic autoclave and self-designed O-ring compression simulator, the effects of compression state and medium phase state on the mechanical properties of terafluoethylene-propylene rubber(FEPM) O-ring were investigated in the condition of high temperature(140 ℃), high pressure(30 MPa) and high content of CO2(0.5 MPa). Then, the tensile, hardness and compression permanent deformation of the O-ring sample were taken as the investigation index, and the damage regular of the mechanical properties before and after the corrosion were analyzed. The results show that the mechanical properties of FEPM O-rings decreased in simulated wellbore condition. The corrosion of FEPM under the free state was more serious than that under the compression state and the corrosion was more serious in liquid phase than in gas phase, the experimental results show a preferable regularity. The mechanical properties reduction degree of the rubber material in compressive stress state could be taken as the main reference for the reliability of rubber seal and the applicability of the rubber material. |
| Key words: terafluoroethylene-propylene rubber O-ring corrosion compression set mechanical property |
