Special Oil & Gas Reservoirs ›› 2020, Vol. 27 ›› Issue (4): 149-155.DOI: 10.3969/j.issn.1006-6535.2020.04.023

• Drilling & Production Engineering • Previous Articles     Next Articles

Development and Test of Concentric Dual-tube ZonalGas Injection String in Fire-Flooding

Leng Bing   

  1. PetroChina Liaohe Oilfield Company, Panjin, Liaoning 124010, China
  • Received:2019-10-26 Revised:2020-05-06 Online:2020-08-25 Published:2022-02-18

Abstract: The development of a fire flooding concentric dual-tube zonal gas injection string was conducted to improve the failures of sealing and zonal gas injection sliding sleeve under frequent conversion between high temperature and normal temperature for the zonal fire flooding gas injection string. A concentric dual-tube string was adopted in the zonal gas injection to establish the inner and outer gas injection channels in different stages by using a fusible valve core and a fusible backing ring. A high resilience and high temperature resistant sealing rubber cylinder was used in zonal sealing, which is characterized by reliable sealing performance and convenient operation. It had been successfully applied for 2 well-times in field zonal fire flooding treatment. This technology could effective improve the sealing performance and the front profile and enhance the swept volume in zonal fire flooding treatment, which is worthy of wide promotion.

Key words: zonal fire flooding, concentric dual-tube gas injection string, high temperature resistant packer, fusible switch sliding sleeve, heavy oil, in-situ combustion

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