Study of Compositional Gradient Model for Volatile
Fluid Reservoir

doi:10. 3863/j. issn. 1674 – 5086. 2013. 04. 021

Abstract

Abstract:

Under the effect of pressure，temperature and depth，the volatile fluid reservoir shows obviously the reservoir
composition change with the well depth，about which little research is done in domestic companies and universities. Firstly，the
paper summarizes the theory model of its compositional gradient with consideration of gravity，thermal gradient and thermal
diffusion. Under the gravity and thermal gradient model，phase state regression and gradient simulation are finished for all
samples. The more reasonable compositional gradient model can be found，which could describe prosperities variation with
depth better，such as compositions，GOR，volume factor，etc. Precision of OOIP evaluation is improved by using trend of
volume factor with depth. Matching of GOR and bottom-hole pressure is observably better than the fixed compositional model，
which shows that the model can describe fluid variation with depth during development. At the same time，the achievement
will provide significant evidence for reservoir development and management. What is more，the research method has important
reference value for similar fluid or reservoir.

Key words: deep-water field, volatile fluid, compositional gradient, OOIP, reservoir simulation

Yang Baoquan1, Yang Li1, Wang Xing2, Yuan Zhiwang1, Bo Fanqing1. Study of Compositional Gradient Model for Volatile
Fluid Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 04. 021.

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