| 李天雷,曹大勇,李科,钟洋,姜放,曾德智.高温高压高含CO2环境下两种氟橡胶密封可靠性评价[J].装备环境工程,2020,17(11):18-23. LI Tian-lei,CAO Da-yong,LI Ke,ZHONG Yang,JIANG Fang,ZENG De-zhi.Evaluation on Sealing Reliability of Two Kinds of Fluorinated Rubber in High Temperature, High Pressure and High CO2 Environment[J].Equipment Environmental Engineering,2020,17(11):18-23. |
| 高温高压高含CO2环境下两种氟橡胶密封可靠性评价 |
| Evaluation on Sealing Reliability of Two Kinds of Fluorinated Rubber in High Temperature, High Pressure and High CO2 Environment |
| 投稿时间：2020-09-27 修订日期：2020-10-10 |
| DOI：10.7643/issn.1672-9242.2020.11.003 |
| 中文关键词: 模拟工况 承压状态 CO2腐蚀 氟硅橡胶 物理性能 抗渗透性能 密封可靠性 |
| 英文关键词:simulation condition stress state CO2 corrosion fluorosilicone rubber physical properties permeability resistance sealing reliability |
| 基金项目: |
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| Author | Institution |
| LI Tian-lei | China Petroleum Engineering & Construction Corporation Southwest Company Co.Ltd., Chengdu 610500, China;CNPC Key Tubular Goods Laboratory, Chengdu 610500, China |
| CAO Da-yong | Southern Sichuan Aerospace Energy Technology Ltd, Luzhou 646000, China |
| LI Ke | China Petroleum Engineering & Construction Corporation Southwest Company Co.Ltd., Chengdu 610500, China;CNPC Key Tubular Goods Laboratory, Chengdu 610500, China |
| ZHONG Yang | State Key Laboratory of Southwest Petroleum University Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China |
| JIANG Fang | China Petroleum Engineering & Construction Corporation Southwest Company Co.Ltd., Chengdu 610500, China;CNPC Key Tubular Goods Laboratory, Chengdu 610500, China |
| ZENG De-zhi | State Key Laboratory of Southwest Petroleum University Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China |
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| 中文摘要: |
| 目的 研究两种氟橡胶O型圈在总压为25 MPa，CO2体积分数为5%，温度为120 ℃，液相介质Cl‒质量浓度为7000 mg/L的高温高压高含CO2工况下的密封可靠性。方法 通过高温高压釜模拟井下实际工况，采用自研橡胶O型圈密封装置实现试样的承压状态，以物理性能、腐蚀形貌和抗渗透性能为考察指标，对两种氟橡胶O型圈的耐蚀性能和密封性能进行测试评价。结果 氟硅橡胶O型圈在承压状态下腐蚀后，拉伸强度由18.1 MPa下降为13.4 MPa，拉断伸长率由172.8%下降为151.9%。AFLAS橡胶O型圈在承压状态下腐蚀后，拉伸强度由21 MPa下降为14.6 MPa，拉断伸长率由277%下降为212.3%，硬度从84HA下降为75.5HA，表面破损严重。两种橡胶O型圈抗渗透性能随压差增大、温度上升而减弱。结论 承压状态下，两种橡胶O型圈性能衰减程度低于自由状态，氟硅橡胶O型圈在承压状态下表现出更好的密封可靠性。 |
| 英文摘要: |
| The work aims to study the sealing reliability of two kinds of fluorosilicone O-ring in high temperature, high pressure and high CO2 environment (25 MPa, 5% CO2, 120 ℃ and 7000 mg/L Cl‒). The actual conditions were simulated by the high-temperature and high-pressure autoclave. The stress state of the specimen was realized with self-grinding rubber O-ring sealing device. The corrosion resistance and sealing properties of two kinds of fluorine rubber O-rings were tested and evaluated in terms of physical properties, corrosion morphology and permeability resistance. The tensile strength of fluorosilicone O-ring decreased from 18.1 MPa to 13.4 MPa and the elongation at break decreased from 172.8% to 151.9% after corrosion under stress state. After the corrosion of AFLAS rubber O-ring under stress state, the tensile strength decreased from 21 MPa to 14.6 MPa, the elongation at break decreased from 277 % to 212.3 % and the hardness decreased from 84 HA to 75.5 HA. The surface damage of AFLAS rubber O-ring was serious. The permeability resistance of two rubber O-rings decreased with the increase of differential pressure and temperature. The degree of performance attenuation of two rubber O-rings under stress state was lower than that under free state. The fluorosilicone O-rings show better sealing reliability under stress state. |
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