Correlation between gas compositions and physical phenomena affecting the reservoir fluid in Palinpinon geothermal field (Philippines)

Conference · Thu Jan 28 00:00:00 EST 1993

OSTI ID:888942

D'More, F; Nuti, S; Ruaya, J R; Ramos-Candelaria, M N; Seastres, J S

Using thermodynamic gas equilibria to calculate temperature and steam fraction in the reservoir, three main physical phenomena due to exploitation of Palinpinon field are identified. 1) Pressure drawdown producing a local increase in the computed steam fraction, with the fluid maintaining high temperature values (close to 300°C). Strong decline in flow rate is observed. 2) Irreversible steam losses from the original high temperature liquid phase during its ascent through fractures in upper zones of the reservoir. Steam is generally lost at temperatures (e.g. 240°C) lower then those of the original aquifer. 3) Dilution and cooling effects due to reinjection fluid returns. These are function of the local geostructural conditions linking through fractures the injectors and production wells. The computed fraction of the recovered reinjected brine can in some case exceed 80% of the total produced fluid. At the same time the computed gas equilibration temperatures can decline from 280-300°C to as low as 215-220°C. Comparing these values with the well bottom measured temperatures, the proposed methodology based on gas chemistry gives more reliable temperature estimate than water chemistry based geothermometers for fluids with high fractions of injected brine.

• Research Organization: CNR, International Institute for Geothermal Researches, Pisa, IT; PNOC-Energy Development Corp., Fort Bonifacio, Makati, PH
• Sponsoring Organization: USDOE
• OSTI ID: 888942
• Report Number(s): SGP-TR-145-32
• Resource Relation: Conference: Proceedings, eighteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 26-28, 1993
• Country of Publication: United States
• Language: English

Related Subjects

Geothermal Legacy