Top head drive well drilling apparatus with stabbing guide
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United States of America Patent
Stats
-
May 26, 1987
Issued Date -
N/A
app pub date -
Jun 12, 1986
filing date -
Apr 11, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A top head drive well drilling apparatus having a drive unit for rotating a drill string about the longitudinal axis of the drill string. The drive unit is mounted on a carriage, which is guided along a guide track. A stem extends downward from the drive unit to transmit torque from the drive unit to the drill string. A wrench assembly is mounted on the drive unit for making and breaking connections between the stem and the drill string. The wrench assembly can be moved vertically and horizontally in relation to the stem. A stabbing guide is mounted on the wrench assembly for aligning the stem and the drill string. The stabbing guide can be moved vertically relative to the wrench assembly, and has a gripping head having a pair of pivotal latch arms for closing around the drill string. A trigger and a limit switch automatically close the latch arms around the drill string when the stabbing guide is moved onto the drill string.
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Cited Art Landscape
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