Geothermal expansion wellhead system
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United States of America Patent
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Apr 23, 1985
Grant Date -
N/A
app pub date -
Sep 16, 1983
filing date -
Sep 16, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A geothermal expansion wellhead system is provided which adapts the wellhead and control valves to the casing in the wellbore. The system suspends and seals the casing while expanding and contracting during geothermal operations at temperatures up to 550.degree. F. and above. The system consists of an expansion spool in which there is mounted an expansion mandrel which is secured on the end of the production casing extending out of a cemented geothermal well. The expansion mandrel has a hard smooth surface, preferably produced by electroplating. Annular seals seal the annulus between the expansion mandrel and the expansion spool and have a sliding engagement with the hard smooth surface of the expansion mandrel. The annular seals are energized by pressurization with a high temperature plastic composition and the seal may be re-energized at any time during operation. The expansion mandrel includes scraper elements which scrape off corrosion or other deposits on the inner surface of the expansion spool. Various modifications of the system well operate on high temperature, superheated hot water; wet steam; and dry steam.
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