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Parametric Study of Condensate Bank Development and Well Productivity Loss in Gas Condensate Wells
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Condensate bank is formed near the wellbore after bottom-hole pressure is dropped below the dew point pressure. Based on Fevang theory (1995), the main source of productivity loss in gas condensate (GC) wells is region 1 (the closet region to the wellbore), where condensate saturation exceeded critical value. The size of region 1 increases with time. The maximum condensate saturation and development of condensate bank depends on a combination of different parameters.
In this study, a parametric analysis was carried out to investigate the development of region 1 and productivity loss in the GC wells. It was found that production rate impacts the formation time of region 1, while its development with respect to pressure depletion is identical for various production rates. Increasing fluid richness results in faster development of region 1, while the effect of critical condensate saturation is in reverse.
The degree of productivity loss is mainly a function of SCAL data rather than fluid type and production rate. The maximum condensate saturation in the vicinity of wellbore is higher than PVT test condensate dropout, and depends on SCAL data. The degree and time of productivity loss can be estimated by a simple method proposed in this study.