Loading...

Experimental analysis of secondary gas injection strategies

Heidari, P ; Sharif University of Technology | 2013

799 Viewed
  1. Type of Document: Article
  2. DOI: 10.1080/10916466.2010.533140
  3. Publisher: 2013
  4. Abstract:
  5. CO2 injection is a potentially viable method of enhanced oil recovery for medium oil reservoirs. The authors compare the effect of gas injection strategy (simultaneous water-alternating gas [SWAG], water-alternating gas [WAG], and continuous gas injection [CGI]) on recovery in immiscible, near-miscible, and miscible modes of injection. It has been proved that CGI is not the most efficient injection scenario in oil-wet reservoirs. Miscible and near-miscible core flood tests demonstrated high oil recoveries in all injection strategies due to high capillary numbers achieved as a result of miscibility. The fluid mechanics of floods were discussed using pressure drop data, different mechanics was observed for SWAG, WAG, and CGI and better mobility control of SWAG was proven. Results show that tapering postponed gas breakthrough and less amount of gas was injected using this technique, making tapering favorable economically and operationally. Experiments with different gas-water ratios were performed and the results show that the ultimate oil recovery during SWAG injection is almost independent of gas-water ratio. This makes SWAG injection a promising recovery process especially for reservoirs where continuous and high-rate gas injection is not possible
  6. Keywords:
  7. CO2 injection ; Enhanced oil recovery (EOR) ; Gas injection ; Miscible gas injection ; SWAG ; WAG ; Enhanced oil recovery ; Carbon dioxide ; Enhanced recovery ; Floods ; Fluid mechanics ; Gases ; Petroleum reservoir engineering ; Petroleum reservoirs ; Recovery ; Water injection
  8. Source: Petroleum Science and Technology ; Volume 31, Issue 8 , 2013 , Pages 797-802 ; 10916466 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/10916466.2010.533140?journalCode=lpet20