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Simulation model evaluation in foamy oil reservoir and percolation mechanism study based on experimental matching
SUN Xiao-fei1, ZHANG Yan-yu1, LI Xing-min2, LI Wei-wei1, SONG Hui-hui3
(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;3.Oil Production Technology Research Institute of Shengli Oilfield, Dongying 257000, China)
Abstract:
Four-component(water, crude oil, dissolved gas and free gas) and five-component(water, crude oil, dissolved gas, dispersed gas and free gas) foamy oil models were built which can reflect the foamy oil percolation mechanism. Compared with the black oil model, two models were evaluated based on the data of pressure depletion test. The influences of parameters on foamy oil flow such as reaction factor (F1) reflecting the bubbles aggregation and growth velocity, the viscosity of crude oil (μo), control time of pressure (tP) were studied. The results show that five-component foamy oil model is the most suitable model for the foamy oil reservoir. F1, μo and tP have a great influence on the oil model. With the increase of F1, the cumulative oil production decreases and the cumulative gas production increases in the four-component foamy oil model, while the cumulative oil and gas production increase in the five-component foamy oil model. The cumulative oil and gas production decrease in the three models with the increase of μo. With the pressure depletion rate increasing, the critical gas saturation becomes large and the flow capacity of gas decreases, which makes dissolved gas drive development effect become good.
Key words:  reservoir  pressure depletion test  foamy oil  percolation mechanism  phase matching  numerical reservoir simulation