油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (3): 73-76.

• 工艺技术 • 上一篇    下一篇

一种新型CO2驱油注气管柱的研制及应用

曹力元   

  1. 中国石化华东油气分公司采油厂,江苏 泰州 225300
  • 收稿日期:2019-01-07 出版日期:2019-06-26 发布日期:2019-07-02
  • 作者简介:曹力元(1989 —),男,工程师,采油气工程、井下作业。E-mail: 929201565@qq.com

Research on a new kind of CO2 flooding injection string and its application in Subei oilfield

Cao Liyuan   

  1. Taizhou Oil Production Plant, East China Company, SINOPEC, Taizhou, Jiangsu 225300, China
  • Received:2019-01-07 Online:2019-06-26 Published:2019-07-02

摘要:

CO2驱油是有效提高原油采收率的手段之一。苏北油田自2005年开始注CO2驱油试验,前期注气管柱采用Y221封隔器密封管柱,基本满足注气的要求,但也存在注气管柱气密封性能差、反洗阀打不开、无法循环更换油套环空缓蚀剂等问题,导致油管、油层套管腐蚀严重,后期施工困难。从2014年起,在研制采用Y445J封隔器的基础上,对油管材质等进行改进优化,设计了新型CO2驱油注气管柱(Φ73.02 mm N80-3Cr-BGT1扣气密封油管+滑套开关+Y445J封隔器+Φ73.02 mm N80外加厚油管+多功能注气阀)。现场试验8井次,试验井均能够保证套压长期为零的良好状态。试验表明,该管柱具有气密封性能良好、可以循环更换油套环空缓蚀剂、防返吐等优点,各项性能符合设计要求,值得推广。

关键词: 苏北油田, CO2驱油, Y221封隔器, Y445J型封隔器

Abstract:

CO2 flooding is one of the effective methods for EOR. CO2 flooding test has been started in Subei(northern Jiangsu province) oilfield since 2005. Y221 packer was used to seal pipe column in the early stage, which basically met the requirements of gas injection. But there still existed problems such as the poor gas sealing performance of gas injection pipe string, the backwashing valve could not be opened, or the casing annulus corrosion inhibitor could not be replaced in circulation, which led to serious corrosion of tubing and casing, and it brought difficulties to the later operation. Since 2014, by improving and optimizing the tubing material, a new CO2 flooding pipe string (Φ73.02 mm N80-3Cr-BGT1 gas sealing tubing+sliding sleeve switch+Y445J packer+Φ73.02 mm N80 thickening tubing+gas admittance valve of multi-function) has been designed based on the development and application of Y445J packer. And field tests have been conducted for 8 wells, all of which can ensure the good condition of casing pressure being zero for a long time. The experiment shows that the pipe string has the advantages of good gas sealing performance, circulating replacement of oil casing annulus corrosion inhibitor, and preventing back flow. The performance meets the design requirements, and is worth popularizing.

Key words: Subei oilfield, CO2 flooding, Y221 packer, Y445J packer

中图分类号: 

  • TE357