Down-hole blow-out preventers
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United States of America Patent
Stats
-
Dec 15, 1987
Grant Date -
N/A
app pub date -
Jun 10, 1986
filing date -
Jun 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A down-hole blow-out preventer has a housing (10) which is engageable in a drill string and which has a ball-valve (13) pivotally mounted in the bore (11) of the housing. The ball-valve is rotated from an open to a closed position by means of a cooperating cam sleeve (20) which is moved downwardly when mud pressure in the borehole is exposed to the flanged end (22) of the cam sleeve, which occurs when a solenoid valve (26) opens up a passage (27) upon a signal being received by a down-hole unit (39).
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