Simple interpretations of chemical transients in multi-feed, two-phase geothermal wells; Examples from Philippine Geothermal fields

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Geothermics (International Journal of Geothermal Research and its Applications); (United States)

DOI:https://doi.org/10.1016/0375-6505(91)90011-J· OSTI ID:7239584

Ruaya, J R; Solis, R P; Solana, R R; Seastres, Jr, J S ^[1]

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1. PNOC Energy Development Corp., Ft. Bonifacio, Makati, Metro Manila (PH)

This paper reports that the main process responsible for the extreme variations in chloride concentrations in the water discharged by selected multi-feed, two-phase geothermal wells in the Philippines is steam addition brought about by fluid flashing in the formation or by a shallow and distinct steam zone. Correlation of enthalpy with chloride data over a span of seven years for well 106, Tongonan field, revealed the entry of reservoir fluid from the hotter portion of the field as the well responded to exploitation. Using a plot of discharge enthalpy versus total chloride, the deep chloride near well OP-3D which is drilled at the periphery of the Bacon-Manito field, has been determined at about 8700 mg/k. This is somewhat higher than the inferred chloride level of 7000 mg/kg in the postulated main geothermal reservoir. The competing effects of returns of reinjected water and flashing in the formation on the observed chloride concentrations in the discharge water of well PN-20D, Palinpinon field, have been segregated using the technique described above.

• OSTI ID: 7239584
• Journal Information: Geothermics (International Journal of Geothermal Research and its Applications); (United States), Vol. 20:5; ISSN 0375-6505
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
GEOTHERMAL FLUIDS
CHLORIDES
PHILIPPINES
GEOTHERMAL FIELDS
ENTHALPY
FLASHING
GEOTHERMAL WELLS
QUANTITY RATIO
REINJECTION
TONGONAN GEOTHERMAL FIELD
ASIA
CHLORINE COMPOUNDS
DEVELOPING COUNTRIES
EVAPORATION
FLUIDS
HALIDES
HALOGEN COMPOUNDS
ISLANDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
WELLS
150302* - Geothermal Exploration & Exploration Technology- Geochemical Techniques & Surveys