Chemical stimulation treatment, The Geysers: Ottoboni State 22. Geothermal-reservoir well-stimulation program
Experiment No. 6 of the Geothermal Reservoir Well Stimulation Program (GRWSP) was performed at The Geysers Field in Sonoma County, California. This well had low productivity (46,000 lb/hr), probably because it did not intersect the primary natural fracture system of the reservoir. Surrounding production wells are considered to be good wells with an average flow rate of about 100,000 lb/hr. The stimulation technique selected was an acid etching treatment (Halliburton Services' MY-T-ACID). A small water prepad was used to provide tubular cooling and fluid loss control. Following the water prepad were 500 to 750 bbl of high viscosity crosslinked gel fluid and 400 to 500 bbl of a hydrofluoric-hydrochloric (HF-HCl) acid solution. The frac fluids were expected to enter only a single or limited fracture zone within the open interval. Frac rates of 20 to 40 BPM and surface pressures of 3000 psig were estimated for this treatment. During the job, however, no significant surface pressure was recorded, and all fluids flowed easily into the interval. Subsequent evaluation of the well performance showed that no noticeable stimulation had been achieved even though the frac fluids were properly injected. Temperature and gamma ray surveys along with tracer studies indicated that the frac fluids entered natural fracture channels over a 650-foot zone of the open interval, which probably prevented the staged acid etching treatment from functioning as designed.
- Research Organization:
- Republic Geothermal, Inc., Santa Fe Springs, CA (USA)
- DOE Contract Number:
- AC04-79AL10563
- OSTI ID:
- 6760311
- Report Number(s):
- DOE/AL/10563-T11; ON: DE82021732
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GEOTHERMAL WELLS
ACIDIZATION
WELL STIMULATION
FRACTURING FLUIDS
GEYSERS GEOTHERMAL FIELD
HYDROCHLORIC ACID
HYDROFLUORIC ACID
TEMPERATURE SURVEYS
TRACER TECHNIQUES
VISCOSITY
FLUIDS
GEOPHYSICAL SURVEYS
GEOTHERMAL FIELDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ISOTOPE APPLICATIONS
STIMULATION
SURVEYS
WELLS
Geothermal Legacy
150906* - Geothermal Engineering- Reservoir Stimulation & Extraction Technology