Control of Calcium Carbonate Scale Using Concentric Tubing at Coso Geothermal Field
- Key words
- Production; Brine Technology; California; USA; Inyo; Coso; Capillary Tubing; Coiled Tubing; CaCO2; Chemical Inhibitor; Scaling; Case Histories; Calcium Carbonate; Concentric Coiled Tubing; Polymagic Anhydride; 45 Degree Port; Downhole Inhibitor Injection
- Location
- Coso, California
- Conference
- Geothermal Resources Council Transactions
- Year
- 1990
- Session
- Scaling; Tubulars; Calcium carbonate; Equipment design
- Language
- English
Abstract
This paper reviews the history of efforts to control calcium carbonate scaling in the Coso Geothermal Field. It describes the use of concentric tubing (a capillary tube inside coiled tubing) to inject scale inhibitor downhole. The concentric tubing has been much more reliable as an inhibit injection string than unprotected capillary tubing for Coso well conditions. The stainless steel capillary tube inside resists corrosion by the inhibitor, and the carbon steel coiled tubing provides the mechanical strength to withstand wellbore turbulence.
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