Special Oil & Gas Reservoirs ›› 2021, Vol. 28 ›› Issue (3): 144-150.DOI: 10.3969/j.issn.1006-6535.2021.03.022

• Drilling & Production Engineering • Previous Articles     Next Articles

Development and Application of Supporting String for Composite Huff and Puff Technology of Heavy Oil Reservoirs

Lang Baoshan   

  1. PetroChina Liaohe Oilfield Company, Panjin, Liaoning 124010, China
  • Received:2020-10-29 Revised:2021-03-03 Online:2021-06-25 Published:2022-02-16

Abstract: In the middle and later development stages of heavy oil reservoirs, there are more challenges such as uneven productivity, low pressure and low production, steam channeling, which have seriously affected the development efficiency of heavy oil reservoirs. In the field application of composite huff-puff technologies such as carbon dioxide and nitrogen assisted drainage, there are problems such as poor pertinence of measures, long construction period, and low production rate. In this regard, core tools such as ball injector, double-acting packer and reversible injection valve ball were developed, and the layered steam injection mechanical string was flexibly combined with the composite huff and puff technology to develop the supporting string technology for composite huff and puff in heavy oil reservoirs, realizing the purpose of quantitative injection of different media on demand. The field application indicated that this technology solved the problem of low application efficiency of conventional composite huff and puff technology and effectively improved the composite huff-puff effect and production rate of oil wells. This technology supports the scale application of the composite huff and puff technology in the later development stage of heavy oil reservoirs, with promising application and high potential.

Key words: heavy oil, compound huff and puff, separate steam injection, carbon dioxide, nitrogen assisted drainage, process string

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