Well casing grip assurance system
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United States of America Patent
Stats
-
Jun 30, 1987
Grant Date -
N/A
app pub date -
Dec 4, 1986
filing date -
Dec 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A casing grip assurance interlock system connected with the elevator and the spider of a well casing installation apparatus including positioning valves respectively actuated by the elevator and the spider to permit actuating fluid pressure to be admitted to either the elevator or the spider only when the other of the elevator or spider is positioned to firmly grip the well casing.
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Family
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Cited Art Landscape
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