Reservoirs, condensation and phase equilibria researchgate, the. Characterization of gas condensate reservoirs is a di. Model for the prediction of condensate recovery was developed by integrating experimental design, reservoir composition and fluid characterization followed by parametric study in order to. Pdf production performance of gas condensate reservoirs. Modelling and simulation of a gas condensate reservoir. This book presents a comparison of different methods for generating pvt properties of volatile oil and gas condensate reservoir fluids determined that pvt properties generated with the whitson and torp method agree the best with full eos compositional simulation.
Reservoir pressure can be maintained by fluid injection if gas production is preferable to liquid production. Gas condensate reservoirs are the categories of hydrocarbon reservoirs. There are many condensate sources, and each has its own unique gas condensate composition. The algorithm is a valuable tool for the reservoir engineer who analyzes gas condensate reservoirs. The two important aspects of this reservoir are fieldwide composition variation and reservoir compartmentalization. The solubility of gas components and its importance in gas. Download table composition of natural gas condensate hc mixtures. Compositional modeling of gascondensate reservoirs. Results from this study show that composition varies significantly during depletion.
The hawiyah jauf reservoir is a complex structuralstratigraphic trap located along the east flank of the uplifted ghawar structure. A retrogradecondensate fluid has a phase envelope such that reservoir temperature lies between the critical. The rich gas drops out more condensate than the lean gas bottom leftt. The converted table gives the saturated oil and gas phase molar densities molesrb and compositions mole fractions x, and yj as singlevalued functions of pressure. Understanding gascondensate reservoirs semantic scholar.
Spe society of petroleum engineers reservoir engineering. A retrograde gas condensate with following composition is existed in a reservoir. Lower the reservoir pressure by a given amount typically, 200 psi. The liquid dropout curve assumes the two phases remain in contact with one another. Composition variation during flow of gascondensate wells. Considerable variations of hydrocarbon composition with depth have been reported in several north sea gascondensate fields. This book is conflated based on the last scientific researches by authors and according to the last books and articles which are published in fundamentals of reservoirs engineering. Treatment of variations of composition with depth in gascondensate. To obtain the socalled blackoil pvt properties bo, bg, rs, and rv of gas condensates, this. Naturalgas condensate, also called natural gas liquids, is a lowdensity mixture of. Gascondensate reservoirs represent an important source of hydrocarbon. Therefore the controlling experiments such as total reservoir fluid composition and dew point pressure for gas condensate samples are done on. Flash the reservoir fluid at the new pressure, calculate amount of moles in the gas and liquid phases gast and liqt and the densities and molecular weights of each of the phases at the new condition. When pressure decreases at reservoir temperature, a rich gas top leftt forms a higher percentage of liquid than a lean gas top rightt.
Production performance of gas condensate reservoirs. Compositional numerical model a case study of hai thach moc tinh fields conference paper pdf available january 2015 with 724 reads. Gas condensate related topics well deliverability, well test interpretation. Due to the difference in mobilities caused by relative permeability, the composition of the mixture will change locally. Gas produced in association with condensate is called. It is well known that a black oil pvt table including formation volume factors, r, and r, versus pressure can be converted to compositional mode. However, the discovery pressure in the reservoir is 6998 psi, and higher than its dewpoint pressure, 5990 psi.
Modeling a rich gas condensate reservoir with composition. In addition, the classification of hydrocarbon fluids can be by the composition analysis of. Modeling a rich gas condensate reservoir with composition grading and faults. Flow behavior of gascondensate wells stanford university. Using the reservoir fluid composition, distribute the initial moles of reservoir fluids into components, and store such quantities for material balance accounting.