Grip enhanced tractoring
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United States of America Patent
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Dec 10, 2013
Grant Date -
Jun 2, 2011
app pub date -
Dec 1, 2009
filing date -
Dec 1, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A tractor configured for grip locking during advancement to avoid slippage, particularly in open-hole wells. The tractor is equipped with a grip lock mechanism for independently locking an anchor grip in a radially outward direction. This locking occurs sequentially in advance of the power stroke of a reciprocating drive piston associated with the anchor. Thus, radial outward expansion and gripping are ensured at the time pulling of a load in an axial downhole direction is pursued. Such grip locking may be employed throughout tractoring or intermittently, depending upon well characteristics such as formation hardness and well diameter.
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