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Title: Analysis of well test data from the high-temperature geothermal system of Amatitlan, Guatemala

Abstract

Two of the four production-diameter wells at Amatitlan have been flow tested for about four weeks each. Wellhead pressures were kept fairly constant at approximately 10 kscg for most of the test to determine behavior under commercial operating conditions. Discharge parameters were estimated using the James method for two-phase flow; steam flow rates and power potential were then estimated using a separator pressure of 7 ksca and a steam consumption rate of 7.7 tones per hour per NM. The wells were also throttled for short time periods to obtain relationships between total flow rate, enthalpy, power potential and wellhead pressure. The total mass flow rate in well AMF-1 increased from 105 to 170 tones per hour during the test, yielding a power potential of 4.5 to 6 MW. Enthalpy was relatively constant at 300 kcal/kg during the test, under both full open and throttled conditions. Multiple feed zones were indicated by pressure cycling under throttled conditions. The well had an unusually low maximum discharging pressure of 16 - 17 kscg, which is attributed to a low static water level and the presence of an upper {open_quotes}thief{open_quote} zone just below the casing shoe at 850m. The productivity index was estimated tomore » be 6.8 tones per hour per ksc. The output of well AMF-2 also increased from 5.5 to more than 7 NM during its four-week test period, with the total flow rate remaining constant at approximately 80 tones per hour and discharge enthalpy increasing due to flashing in the reservoir. The well produces from a natural two-phase zone. The maximum discharge pressure was more than 37 kscg, but the productivity index was relatively low (about 1.5 tons per hour per ksc). The pressure build-up time after shut-in was insufficient to allow a direct calculation of transmissivity; however, based on the measured static pressure at the well`s assumed feed zone, a transmissivity of 1,200 md{center_dot}m is estimated.« less

Authors:
; ; ;  [1]
  1. GeothermEx, Inc., Richmond, CA (United States); and others
Publication Date:
OSTI Identifier:
494438
Report Number(s):
CONF-960913-
TRN: 97:002642-0115
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the Geothermal Resources Council, Portland, OR (United States), 29 Sep - 2 Oct 1996; Other Information: PBD: 1996; Related Information: Is Part Of Geothermal development in the Pacific rim. Transactions, Volume 20; PB: 886 p.
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GUATEMALA; GEOTHERMAL RESOURCES; GEOTHERMAL WELLS; FIELD TESTS; PRODUCTION; GEOTHERMAL SYSTEMS; FLUID FLOW; RESOURCE DEVELOPMENT

Citation Formats

Menzies, A J, Sanyal, S K, Granados, E E, and Pham, M. Analysis of well test data from the high-temperature geothermal system of Amatitlan, Guatemala. United States: N. p., 1996. Web.
Menzies, A J, Sanyal, S K, Granados, E E, & Pham, M. Analysis of well test data from the high-temperature geothermal system of Amatitlan, Guatemala. United States.
Menzies, A J, Sanyal, S K, Granados, E E, and Pham, M. 1996. "Analysis of well test data from the high-temperature geothermal system of Amatitlan, Guatemala". United States.
@article{osti_494438,
title = {Analysis of well test data from the high-temperature geothermal system of Amatitlan, Guatemala},
author = {Menzies, A J and Sanyal, S K and Granados, E E and Pham, M},
abstractNote = {Two of the four production-diameter wells at Amatitlan have been flow tested for about four weeks each. Wellhead pressures were kept fairly constant at approximately 10 kscg for most of the test to determine behavior under commercial operating conditions. Discharge parameters were estimated using the James method for two-phase flow; steam flow rates and power potential were then estimated using a separator pressure of 7 ksca and a steam consumption rate of 7.7 tones per hour per NM. The wells were also throttled for short time periods to obtain relationships between total flow rate, enthalpy, power potential and wellhead pressure. The total mass flow rate in well AMF-1 increased from 105 to 170 tones per hour during the test, yielding a power potential of 4.5 to 6 MW. Enthalpy was relatively constant at 300 kcal/kg during the test, under both full open and throttled conditions. Multiple feed zones were indicated by pressure cycling under throttled conditions. The well had an unusually low maximum discharging pressure of 16 - 17 kscg, which is attributed to a low static water level and the presence of an upper {open_quotes}thief{open_quote} zone just below the casing shoe at 850m. The productivity index was estimated to be 6.8 tones per hour per ksc. The output of well AMF-2 also increased from 5.5 to more than 7 NM during its four-week test period, with the total flow rate remaining constant at approximately 80 tones per hour and discharge enthalpy increasing due to flashing in the reservoir. The well produces from a natural two-phase zone. The maximum discharge pressure was more than 37 kscg, but the productivity index was relatively low (about 1.5 tons per hour per ksc). The pressure build-up time after shut-in was insufficient to allow a direct calculation of transmissivity; however, based on the measured static pressure at the well`s assumed feed zone, a transmissivity of 1,200 md{center_dot}m is estimated.},
doi = {},
url = {https://www.osti.gov/biblio/494438}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}

Conference:
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