【作者】 刘畅；

【导师】 李海涛；

【作者基本信息】 西南石油大学 ， 油气井工程， 2018， 硕士

【摘要】 在天然气的开采过程中,井下油管有着非常重要的地位。由于五坪气田产层较深、地层温度压力较高,外加产凝析液、腐蚀性物质多,致使油管所处的井下环境十分恶劣,即使采取了防腐措施,井下油管所处的腐蚀环境也相当危险。由于产层较深、地层温度压力较高、腐蚀性物质多且含量较高,外加产凝析液,致使油管所处的井下环境十分恶劣;且因对腐蚀认识的不足,过去对五坪气田井下管串未能及时实施缓蚀剂保护工作;同时,气井防腐方案是参照相邻区块气井的防腐方案制定的,其针对性不高,保护效果不理想,导致井下油管腐蚀情况较为严重,生产和修井作业也受到较大影响。针对五坪气田生产和作业受到井下油管被腐蚀严重影响的情况,本文综合了国内外关于井下油管腐蚀与防腐研究的现状和五坪气田自身井下环境的分析,确定五坪气田井下油管腐蚀的主控因素为CO2、H2S和C1-,并通过优化经验公式,得出适合五坪气田的腐蚀预测模型。利用建立的腐蚀预测模型对现有石炭系生产井油管腐蚀状况进行了预测。本文根据五坪气田井下油管的腐蚀及防腐情况,结合五坪气田的井下流体性质,重点从井下材质优选、缓蚀剂室内评价等方面进行研究,制定了针对五坪气田五坪11、64、67、80、85、021-3井的缓蚀剂防腐方案,并对五坪11、67、85井缓蚀剂防腐效果进行了评价。更多还原

【Abstract】 In the process of exploitation of natural gas,The down-hole tube plays a very important role.Because of its deep depth、high pressure、high temperature and high content of corroded fluid,the underground environment is really complex.All those factors make underground oil-pipes in danger.The complex underground environment and anti-corrosion measures that not especial for Wuping make the anti-corrosion measures cannot release all corrosion.This situation makes great troubles to normal production of gas wells.Aiming at the corrosion properties of the Wuping gas field,after studying in main causes of corrosion in underground oil pipe,combining the corrosion detection of tubing in the underground gas field of the Wuping gas field with the corrosion environment and ground monitoring in the gas well,the main controlling factors of corrosion have been confirmed as CO2、H2S and Cl-and the corrosion prediction model for Wuping gas field is worked out.With all the achievements above we can make our work on anti-corrosion better.Considering all controlling factors,we make anti-corrosion measures for Wuping 11、Wuping 64、Wuping 67、Wuping 80、Wuping 85and Wuping 021-3 by using corrosion inhibitor,and then evaluated measures for Wuping 11、Wuping 67and Wuping 85.更多还原