Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent
1993-01-13
1994-08-23
Dang, Hoang C.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
1753254, E21B 708
Patent
active
053399145
ABSTRACT:
A down hole drilling tool activating mechanism is provided which will adjustably activate tool elements such as stabilizer pads by a mandrel which will move vertically against a bias spring and has inclined surfaces to bear on the inside of the adjustable pads creating variable diameters. The mandrel has a series of flexible fingers which engage the main body of the tool. A male spline element is provided which moves vertically within the body of the tool so that a portion thereof moves between a position in which it engages the fingers and forces them into engagement thereby locking the mandrel against vertical movement and a second unlocked position in which the portion is removed from the fingers allowing them to flex and allowing them to disengage the body so that the mandrel may move vertically changing the adjustment of the tool. An improved version may be provided with a port to equalize pump pressure between the inner bore and outer surface of the male spline element to prevent unwanted relative movement due to increased pump pressure.
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Dang Hoang C.
Lee Bernard J.
PBL Drilling Tools Ltd.
PBL Machinery Ltd.
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