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Comprehensive study of asphaltene precipitation due to gas injection: Experimental investigation and modeling

Zadeh, G. A. R ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.2118/143454-MS
  3. Publisher: 2011
  4. Abstract:
  5. Asphaltene precipitation during natural depletion and miscible gas injection is a common problem in oilfields throughout the world. In this work, static precipitation tests are conducted to investigate effect of pressure, temperature and gas type and concentration on asphaltene instability. Three different oil samples are studied under reservoir conditions with/without nitrogen and methane injection. Besides applying common thermodynamic models, a new scaling equation is presented to predict asphaltene precipitation under HPHT gas injection. Published data from literature are also used in model development. The scaling approach is attractive because it is simple and complex asphaltene properties are not involved in the calculations. Moreover, the proposed model provides universal parameters for different fluid samples in a wide range of pressure and temperature that makes it novel for evaluation of future gas injection projects when simple PVT data are available
  6. Keywords:
  7. Asphaltene instability ; Asphaltene precipitation ; Common problems ; Comprehensive studies ; Experimental investigations ; Gas injection ; Gas type ; Investigate effects ; Miscible gas injection ; Model development ; Natural depletion ; Nitrogen injection ; Oil samples ; Pressure and temperature ; Pure solid modeling ; PVT data ; Reservoir conditions ; Scaling equations ; Thermodynamic model ; Universal parameters ; Asphaltenes ; Enhanced recovery ; Gases ; Methane ; Nitrogen ; Oil fields ; Petroleum engineering ; Petroleum reservoir evaluation ; Pressure effects ; Water injection
  8. Source: Society of Petroleum Engineers - SPE Enhanced Oil Recovery Conference 2011, EORC 2011, 19 July 2011 through 21 July 2011 ; Volume 1 , July , 2011 , Pages 208-219 ; 9781618390929 (ISBN)
  9. URL: https://www.onepetro.org/conference-paper/SPE-143454-MS