Silica Deposition During Injection in Svartsengi Field
- Key words
- Reservoir Engineering; Production; Iceland; Svartsengi; Liquid Dominated; Steam Cap; Turbines; Carbon Dioxide; Ph; H2S; Condensate; Brine; Stainless; Sudurnes Regional Heating Company
- Location
- Svartsengi, Iceland
- Conference
- Geothermal Resources Council Transactions
- Year
- 1986
- Session
- Injection; Silica; Scaling; Brine chemistry; Well testing; I
- Language
- English
Abstract
An injection/tracer test was carried out in Svartsengi field in 1984. The silica deposition part of the study is reported in terms of silica chemistry, deposition measurements in surface pipelines, water level recording, and downhole caliper logging. The deposition of silica was controlled through dilution and pH lowering by condensate mixing for most of the test period. Short-term lack of steam condensate resulted in silica deposition in the wellbore, such that the well's injectivity decreased considerably and the injection/tracer test had to be stopped. The concept of brine/condensate mixing appears feasible for long-term injection, provided acid injection is used to supplement the pH effect of steam condensate.
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