Acta Petrolei Sinica ›› 2017, Vol. 38 ›› Issue (10): 1210-1216.DOI: 10.7623/syxb201710012

• Petroleum Engineering • Previous Articles     Next Articles

Comparisons between protection fluid and nitrogen column in tube-casing annulus of gas storage wells

Jiang Min1,2, Tan Chaodong1, Li Jun3, Cheng Xinping4, Li Jingjia5   

  1. 1. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    2. Oil & Gas Link(Beijing) Technology Company Limited, Beijing 100102, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    4. Oilfield Technology Engineering Company, CNOOC Energy Technology & Services Company Limited, Tianjing 300452, China;
    5. Beijing Yadan Petroleum Technology Development Company, Beijing 102200, China
  • Received:2016-12-07 Revised:2017-08-25 Online:2017-10-25 Published:2017-11-02

储气库井油套环空注保护液和氮气柱对比

蒋敏1,2, 檀朝东1, 李隽3, 程心平4, 李静嘉5   

  1. 1. 中国石油大学石油工程学院 北京 102249;
    2. 油气网联(北京)科技有限公司 北京 100102;
    3. 中国石油勘探开发研究院 北京 100083;
    4. 中海油能源发展股份有限公司工程技术公司 天津 300452;
    5. 北京雅丹石油技术开发有限公司 北京 102200
  • 通讯作者: 檀朝东,男,1968年5月生,1990年获华东石油学院学士学位,2003年获石油大学(北京)博士学位,现为中国石油大学(北京)副研究员、硕士生导师,主要从事采油气工艺和石油工程大数据方面科研工作.Email:tanchaodong@cup.edu.cn
  • 作者简介:蒋敏,男,1992年4月生,2014年获中国石油大学(北京)学士学位,2017年获中国石油大学(北京)硕士学位,现为油气网联(北京)科技有限公司技术工程师,主要从事油气田开发、管柱力学、物联网方面的研究.Email:737283733@qq.com
  • 基金资助:

    中国石油天然气股份有限公司重大科技专项"储气库注采工程关键技术研究"(2015E-4004)资助。

Abstract:

To effectively solve the safety problems brought by the variation of internal-external pressures on tube string in the production-injection process of underground gas storage, according to the thermodynamical and heat-transfer theories and aiming at the characteristics of fluctuations in temperature and pressure during the injection-production process of tube string in underground gas storage wells, two situations of annulus space filling with protection fluid and nitrogen column were analyzed, created the internal-external pressure equilibrium models of tube string in gas storage, and analytically calculated the internal-external pressures and the variations of tube string under two kinds of models, respectively. Meanwhile, the optimal combination chart of nitrogen column length and packer running depth was developed by focusing on the research on the optimal length of nitrogen column in annulus space. The research results show that under the same conditions, annulus nitrogen injection can reduce the annulus pressure by 50 % -90 % in the injection-production process, and the optimal length of nitrogen column is 1/20-1/15 of the packer running depth. The longer the length of nitrogen column is, the lower the value of annulus pressure will be. The analysis on the sensibility of fluid temperature and pressure in oil tube indicates the prominent influence of temperature on annulus pressure variation. The reasonable length of nitrogen column injected in tube-casing annulus can prevent the tube string destruction of gas storage and the packer failure effectively.

Key words: gas storage, tube-casing annulus, nitrogen column, abnormally high pressure, optimization

摘要:

为了有效解决地下储气库注采过程中管柱内外压力变化给管柱安全性带来的问题,针对地下储气库气井管柱注采过程中温度、压力的波动特征,采用热力学与传热学理论,根据环空注满保护液与环空注入一段氮气柱2种情况分别建立了储气库管柱内外压力平衡模型,分析计算了2种模型的管柱内外压力及变化差异,重点研究了环空注氮气柱的最佳长度,绘制了氮气柱长度与封隔器下入深度最佳组合图版。研究结果表明:相同条件下环空注氮气可将注采过程中环空压力减少50 % ~90 % ,最佳氮气柱长度为封隔器下深的1/20~1/15;氮气柱长度越长,环空压力值越低;油管流体温度、油管内压力的敏感性分析表明,温度对环空压力变化影响较大;油套环空里注入合理的氮气柱长度可以防止储气库井管柱破坏和封隔器失效。

关键词: 储气库, 油套环空, 氮气柱, 异常高压, 优化

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