02318nmc a2200229 4500 20260520005606.0 260224s2001 xxu ing Inglés Performance of a Foamy Oil Reservoir in Pseudo-Undersaturated State with Associated Aquifer SPE 69508 Dallas, Texas Society of Petroleum Engineers 2001 12/09/06 ; 17/07/01 Heavy and extra-heavy oil reservoirs, with moderate gas oil ratio have additional primary recovery mechanisms that increase oil production. Morichal-01 reservoir is located close to the Orinoco Oil Belt, approximately 100 km South of Maturin city, Monagas State, Venezuela. This reservoir has a peculiar behavior and shows an additional recovery mechanism called by some researchers as a foamy phenomenon. Such phenomenon occur, at the bubble point pressure, when the remaining gas in solution comes out of solution forming a dispersed trapped free phase inside the phase oil (as layer, it is not a free movable phase), as a consequence, no pressure drop is observed, i.e. pressure is maintained constant. Also flash GOR is constant. As a result, there is a progressive increase in oil recovery due to internal expansion of the gas bubbles. This study aims to explain the peculiar behavior of the reservoir making some adjustment on material balance equations in order to find equations of Drive Depletion Index (DDI) caused by solution gas. All this is caused by solutions gas and free gas bubbles in the oil as well as oil compressibility. Some physical equations that govern foamy oil performance, formation oil volume factor, gas oil ratio and trapped free-gas coefficient (.... ) in the presence of pseudo-undersaturated state, will be presented. CONGTP Yrigoyen, A. 6172 Carvajal, G. 5875 Latin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) 5738 Carvajal, G. 5875 Latin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) 5738 Yrigoyen, A. 6172 131016 131016 https://biblioteca.iapg.org.ar/ArchivosAdjuntos/LACPEC2001/Spe69508.pdf 0 0 0 0 201938 BVIAPG BVIAPG 2026-03-03 200003072 0 200003072 2026-03-03 01:41:09 2026-03-03 ARCHIVO