A simulation study of the enhancement of condensate recovery from one of the Iranian naturally fractured condensate reservoirs

作者：Maleki Mohammad Reza^*; Rashidi Fariborz; Mahani Hassan; Khamehchi Ehsan

来源：Journal of Petroleum Science and Engineering, 2012, 92-93: 158-166.

DOI：10.1016/j.petrol.2012.06.011

• naturally fractured reservoirs
• condensate drop-out
• enhanced gas recovery
• dual permeability
• revaporization phenomenon
• gas injection

The structure and analysis of naturally fractured reservoirs (NFRs) is more complicated than the conventional sreservoirs because of their double medium nature containing matrix (high porosity and low permeability) and fracture network (low porosity and high permeability). There is an essential need for more study and further understanding of fractured reservoirs characteristics due to the fact that the majority of the world%26apos;s petroleum reserves, particularly in the Middle East, are in NFRs. %26lt;br%26gt;The situation is more complicated in gas condensate reservoirs in which the liquid drop-out and condensate blockage phenomena typically occur. In a retrograde gas condensate reservoir, the condensate accumulation in the fractures prevents the fractures to maintain their fundamental role as the most permeable conduit for the gas flow. %26lt;br%26gt;This article deals mainly with the specific phenomena that occur in the gas condensate fractured reservoirs related to condensate banking and the existence of double porosity media for instance decrease of Gas Oil Ratio (GOR), lower horizontal pressure, uniform condensate properties throughout the reservoir, significant difference in production history, and elimination of transition zones. %26lt;br%26gt;The results of this study demonstrate the importance of double porosity/dual permeability model in the simulation of gas condensate fractured reservoirs. Also, the physical properties of fractures such as capillary pressure and relative permeability are of great importance in simulation studies such that the use of linear relative permeability curves inside fracture could lead into wrong predictions.

• 出版日期2012-8