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Title: Geothermal injection treatment: process chemistry, field experiences, and design options

The successful development of geothermal reservoirs to generate electric power will require the injection disposal of approximately 700,000 gal/h (2.6 x 10/sup 6/ 1/h) of heat-depleted brine for every 50,000 kW of generating capacity. To maintain injectability, the spent brine must be compatible with the receiving formation. The factors that influence this brine/formation compatibility and tests to quantify them are discussed in this report. Some form of treatment will be necessary prior to injection for most situations; the process chemistry involved to avoid and/or accelerate the formation of precipitate particles is also discussed. The treatment processes, either avoidance or controlled precipitation approaches, are described in terms of their principles and demonstrated applications in the geothermal field and, when such experience is limited, in other industrial use. Monitoring techniques for tracking particulate growth, the effect of process parameters on corrosion and well injectability are presented. Examples of brine injection, preinjection treatment, and recovery from injectivity loss are examined and related to the aspects listed above.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
6281733
Report Number(s):
PNL-4767
ON: DE85002873
DOE Contract Number:
AC06-76RL01830
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Research Org:
Pacific Northwest Lab., Richland, WA (USA)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL FLUIDS; REINJECTION; AHUACHAPAN GEOTHERMAL FIELD; BRINES; CARBONATES; CERRO PRIETO GEOTHERMAL FIELD; ECONOMICS; FLUID INJECTION; INJECTION WELLS; LARDERELLO GEOTHERMAL FIELD; NEW ZEALAND; PHILIPPINES; PIPELINES; PRECIPITATION; SEPARATION PROCESSES; SILICA; SULFIDES; USA; WASTE DISPOSAL; ASIA; AUSTRALASIA; CARBON COMPOUNDS; CHALCOGENIDES; DEVELOPING COUNTRIES; FLUIDS; GEOTHERMAL FIELDS; ISLANDS; MANAGEMENT; MINERALS; NORTH AMERICA; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; SILICON COMPOUNDS; SILICON OXIDES; SULFUR COMPOUNDS; WASTE MANAGEMENT; WELLS Geothermal Legacy 150600* -- Geothermal Energy-- Environmental Aspects