Evaluation of in-situ compositions in retrograde gas condensate fields
Abstract
Production from gas condensate fields cause low condensate recoveries at surface facilities because of in-situ retrograde condensation and condensate build-up in the reservoir particularly in the vicinity of the wellbore. During depletion, the total composition of in-situ fluid (gas and condensate composition) changes from initial reservoir composition as pressure decreases to values less than Saturation (dew-point) pressure. This paper extends the line of the study conducted by our team (Nasriani et al., 2016) to attain initial in-situ composition from gas and liquid compositions taken from separator during several depletion stages. In our previous work, based on the composition of the mixed sample and initial reservoir composition, a set of novel correlations was developed for estimating initial gas condensate reservoir composition. But as carbon number increased, the predicted compositions by correlation became less accurate. In this study, in order to improve the prediction of in-situ compositions, the components with similar carbon numbers were grouped into a category. The generalised reduced gradient (GRG) algorithm of iteration was used to tune the constant and exponents of the correlation based on available field data.
Publication Title
79th EAGE Conference and Exhibition 2017
Recommended Citation
Nasriani, H., Asadi, E., Khan, K., Graham, T., Ndlovu, S., & Mai, J. (2017). Evaluation of in-situ compositions in retrograde gas condensate fields. 79th EAGE Conference and Exhibition 2017 https://doi.org/10.3997/2214-4609.201700625
