Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1981-09-21
1984-01-31
Purser, Ernest R.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
175 56, 267137, 464 20, E21B 1707
Patent
active
044284438
ABSTRACT:
A shock absorbing tool is provided for connection to a drill column. The drill column includes a drill bit and is positioned in a bore formed in the earth. The shock absorbing tool is an integral, resilient cylindrical member having a number of open sections formed in the cylindrical member. Pairs of open sections are interconnected by slots. Pairs of open sections are longitudinally spaced along the periphery of the cylindrical member. The longitudinal distance between pairs of open sections and the circumferential distance between open sections of each pair of open sections vary. Upon application of dynamic axial and torsional loads to the drill column, the shock absorbing tool absorbs these loads through deflection of the resilient tool such that the slots close and the stress produced by the dynamic loading is carried about the periphery of the open sections. The aforesaid arrangement of open sections and slots permits absorption of varying magnitudes of forces along different portions of the tool to dampen harmonic hysteresis occurring in the tool as a result of the dynamically applied loads. In the preferred embodiment, each of the slots completely closes upon application of different predetermined force applied to the tool in order to provide a variable shock absorbing device.
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patent: 3257827 (1966-06-01), Hughes
patent: 3267695 (1966-08-01), Toelke
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patent: 3447340 (1969-06-01), Garrett
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patent: 3612223 (1971-10-01), Shiomi
patent: 4190276 (1980-02-01), Hirano et al.
patent: 4272114 (1981-06-01), Hirano et al.
Dang Hoang C.
Purser Ernest R.
Stability Drilling Systems, Inc.
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