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Title: BACA Project: geothermal demonstration power plant. Final report

Abstract

The various activities that have been conducted by Union in the Redondo Creek area while attempting to develop the resource for a 50 MW power plant are described. The results of the geologic work, drilling activities and reservoir studies are summarized. In addition, sections discussing the historical costs for Union's involvement with the project, production engineering (for anticipated surface equipment), and environmental work are included. Nineteen geothermal wells have been drilled in the Redondo Creek area of the Valles Caldera: a prominent geologic feature of the Jemez mountains consisting of Pliocene and Pleistocene age volcanics. The Redondo Creek area is within a complex longitudinal graben on the northwest flank of the resurgent structural dome of Redondo Peak and Redondo Border. The major graben faults, with associated fracturing, are geologically plausible candidates for permeable and productive zones in the reservoir. The distribution of such permeable zones is too erratic and the locations too imprecisely known to offer an attractive drilling target. Log analysis indicates there is a preferred mean fracture strike of N31W in the upper portion of Redondo Creek wells. This is approximately perpendicular to the major structure in the area, the northeast-striking Redondo Creek graben. The geothermal fluid foundmore » in the Redondo Creek reservoir is relatively benign with low brine concentrations and moderate H/sub 2/S concentrations. Geothermometer calculations indicate that the reservoir temperature generally lies between 500/sup 0/F and 600/sup 0/F, with near wellbore flashing occurring during the majority of the wells' production.« less

Publication Date:
Research Org.:
Union Oil Co. of California, Los Angeles (USA). Geothermal Div.
OSTI Identifier:
5284563
Report Number(s):
DOE/ET/27163-T2
ON: DE84004766
DOE Contract Number:
FC03-78ET27163
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; BACA GEOTHERMAL FIELD; GEOLOGIC STRUCTURES; GEOTHERMAL WELLS; AIR QUALITY; BRINES; COST; DESIGN; ENGINEERING; ENVIRONMENTAL IMPACTS; FLOW RATE; GEOTHERMAL FLUIDS; GEOTHERMAL POWER PLANTS; HYDROGEN SULFIDES; PERMEABILITY; POWER RANGE 10-100 MW; RESERVOIR TEMPERATURE; TESTING; WATER QUALITY; WELL CASINGS; WELL COMPLETION; WELL DRILLING; CHALCOGENIDES; DRILLING; ENVIRONMENTAL QUALITY; FLUIDS; GEOTHERMAL FIELDS; HYDROGEN COMPOUNDS; POWER PLANTS; SULFIDES; SULFUR COMPOUNDS; THERMAL POWER PLANTS; WELLS; Geothermal Legacy; 150201* - Geology & Hydrology of Geothermal Systems- USA- (-1989); 150901 - Geothermal Engineering- Drilling Technology & Well Hardware

Citation Formats

Not Available. BACA Project: geothermal demonstration power plant. Final report. United States: N. p., 1982. Web. doi:10.2172/5284563.
Not Available. BACA Project: geothermal demonstration power plant. Final report. United States. doi:10.2172/5284563.
Not Available. Wed . "BACA Project: geothermal demonstration power plant. Final report". United States. doi:10.2172/5284563. https://www.osti.gov/servlets/purl/5284563.
@article{osti_5284563,
title = {BACA Project: geothermal demonstration power plant. Final report},
author = {Not Available},
abstractNote = {The various activities that have been conducted by Union in the Redondo Creek area while attempting to develop the resource for a 50 MW power plant are described. The results of the geologic work, drilling activities and reservoir studies are summarized. In addition, sections discussing the historical costs for Union's involvement with the project, production engineering (for anticipated surface equipment), and environmental work are included. Nineteen geothermal wells have been drilled in the Redondo Creek area of the Valles Caldera: a prominent geologic feature of the Jemez mountains consisting of Pliocene and Pleistocene age volcanics. The Redondo Creek area is within a complex longitudinal graben on the northwest flank of the resurgent structural dome of Redondo Peak and Redondo Border. The major graben faults, with associated fracturing, are geologically plausible candidates for permeable and productive zones in the reservoir. The distribution of such permeable zones is too erratic and the locations too imprecisely known to offer an attractive drilling target. Log analysis indicates there is a preferred mean fracture strike of N31W in the upper portion of Redondo Creek wells. This is approximately perpendicular to the major structure in the area, the northeast-striking Redondo Creek graben. The geothermal fluid found in the Redondo Creek reservoir is relatively benign with low brine concentrations and moderate H/sub 2/S concentrations. Geothermometer calculations indicate that the reservoir temperature generally lies between 500/sup 0/F and 600/sup 0/F, with near wellbore flashing occurring during the majority of the wells' production.},
doi = {10.2172/5284563},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 1982},
month = {Wed Dec 01 00:00:00 EST 1982}
}

Technical Report:

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  • The results of a materials survey for the Baca 50 MW(e) single flash geothermal plant in the Valles Caldera of New Mexico are presented. From the design documents provided, materials proposed for use in contact with the plant atmosphere, the two-phase geofluid, the separated steam, and the recirculating condensate cooling water were assessed for suitability. Special emphasis was given to records of performance of the materials in other geothermal plants. Based upon these considerations of chemical reactivity and plant operating experience, a number of recommendations were made.
  • This Baca Geothermal Demonstration Power Plant document presents the design criteria and detail design for power plant equipment and systems, as well as discussing the rationale used to arrive at the design. Where applicable, results of in-house evaluations of alternatives are presented.
  • The Baca project was terminated due to inability to find sufficient steam production to support the power plant. The following aspects of the project are discussed: regional geology; structure, stratigraphy, and permeability in the Redondo Creek; geophysics; geochemical indicators of reservoir conditions; drilling problems; fracture stimulation experiments; reservoir definition and conceptual model; and prediction of reservoir performance.
  • An equation-of-state package for water-carbon dioxide mixtures has been constructed from available thermodynamic data that covers the range of interest to the Baca reservoir system. The package has been used to examine the thermodynamic state of the Baca reservoir fluid for conditions of temperature, pressure and CO/sub 2/ content believed to bracket conditions existing at the production depth of the wells in the Redondo Creek area. It is shown that the reservoir fluid may be either all-liquid or two-phase at various well locations and depths, depending on the CO/sub 2/ content. It is also shown that the CO/sub 2/ contentmore » at reservoir conditions cannot be reliably inferred from pressure/temperature measurements made on flowing wells. The equation-of-state package has been incorporated into a general purpose geothermal reservoir simulator and a series of calculations made which show that the CO/sub 2/ content of the produced fluid may be less than or greater than that of the reservoir fluid. The characteristics of the produced fluid are sensitive to the CO/sub 2/ content in the reservoir.« less
  • The design phase for the 100 KW unit consumed the months of May through November 1978, with the final design selected as having a direct contact boiler and condenser, a single-stage radial inflow induction turbine-generator using isopentane as the working fluid, and a single cell ejector-type cooling tower. The unit was constructed on two, forty-foot flatbed trailers between the months of October 1978 and June 1979. Systems start-up testing, in-field modifications, unit operation, and performance testing were performed between July and December 1979. AP and L (Arkansas Power and Light) personnel assumed responsibility of the unit at that time andmore » conducted further maintenance, operations, and testing through August 1980.« less