Drill pipe inside blowout preventer
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United States of America Patent
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-
Sep 22, 1987
Issued Date -
N/A
app pub date -
May 23, 1986
filing date -
Sep 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An inside blowout preventer for use in an earth boring drill string has features to reduce erosion. The blowout preventer has a valve body for connection into the drill string with a longitudinal passage extending through the body. The ball seat is located in the longitudinal passage. A ball storage location is located below the seat, and offset from the longitudinal passage. A ball is carried in the storage location during downward flow, and moves into the longitudinal passage to seat against the seat if the upward flow is sufficient. The storage location is located in an area of the longitudinal passage which has a much larger flow area than through the seat. The downward flow impinges on a portion of the ball. A communication passage extends from the storage location downward to a reduced diameter section of the longitudinal passage.
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