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An experimental investigation of foam for gas mobility control in a low-temperature fractured carbonate reservoir

Gandomkar, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1080/10916466.2010.493905
  3. Publisher: 2012
  4. Abstract:
  5. This work concerns the experimental investigation of surfactant alternating CO 2 injection in carbonate rocks. The core samples provided from a low-temperature fractured light oil reservoir, located in southwest Iran. The experiments were designed to observe the effect of CO 2-foam injection on gas mobility and oil recovery at different surfactant concentrations. The core samples were initially saturated with synthetic/field brine, 5,000 ppm, and then flooded with live oil to reach connate water saturation at reservoir condition, 115F and 1,700 psia. The commercial surfactant used was sodium lauryl sulfate as an anionic surfactant. The results of this work, along with field-scale simulation and/or economic considerations, could be helpful in making reliable decisions about optimum condition of foam-assisted water-alternating-gas (FAWAG) processes. Core flooding results demonstrated that macroscopic sweep efficiency increased due to foam generation inside the core. In addition, it led to an increase of between 5 and 12% in the recovery factor in comparison to a water-alternating-gas (WAG) process. Furthermore, the value of the critical micellar concentration for the surfactant-oil system was about 2,000 ppm. After primary and secondary recovery processes, there is a large amount of trapped oil in the reservoir. Extensive research has been directed toward enhancing the recovery of this oil, but limited success has been achieved. FAWAG injection appears to have more applicability to recover the trapped resources. However, little attention has been paid to experimental investigation of FAWAG processes in low-temperature oil reservoirs
  6. Keywords:
  7. Critical micellar concentration ; Foam ; Carbonate rock ; Commercial surfactants ; Core flooding ; Critical micellar concentrations ; Economic considerations ; Effect of CO ; Experimental investigations ; FAWAG ; Field-scale simulation ; Foam generation ; Fractured carbonate reservoirs ; Light oil reservoirs ; Live oil ; Low temperatures ; Macroscopic sweep ; Mobility control ; Oil recoveries ; Oil reservoirs ; Optimum conditions ; Recovery factors ; Reliable decision ; Reservoir conditions ; Sodium lauryl sulfates ; Surfactant concentrations ; Water alternating gas ; Water alternating gas process ; Water saturations ; Anionic surfactants ; Carbon dioxide ; Core samples ; Foams ; Petroleum reservoir engineering ; Petroleum reservoirs ; Recovery ; Secondary recovery ; Temperature ; Water injection ; Foam control
  8. Source: Petroleum Science and Technology ; Volume 30, Issue 10 , 2012 , Pages 976-985 ; 10916466 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/10916466.2010.493905#.VrcK2JeHi-E