Drill string element

Details Drill string element Drill string element

1989-04-24

1990-10-09

Watts, Douglas D.

Tool driving or impacting

Means to drive tool about an axis

Means to hold and relatively rotate sections of tool shaft

173132, 173104, 175293, E21B 300

Patent

active

049614690

ABSTRACT:
A drill string element for use in top hammer percussive drilling comprises first and second tubes coupled together by a cylindrical thread, and at least one impact-transmitting ord slidably disposed in the tubes. The rod(s) includes abutments which engage restrictions formed at remote ends of the tubes whereby the rod(s) can be removed only by unscrewing the tubes from one another. Remote ends of the tubes define male and female conical threads which enable the element to be connected to similar elements in the forming of a drill string. The conical threads are easier to unscrew than the cylindrical threads to avoid an accidental separation of the tubes of each element when that element is being unscrewed from another element.

REFERENCES:
patent: 2636753 (1953-04-01), Griffin
patent: 3011570 (1961-12-01), Kurt et al.
patent: 4094364 (1978-06-01), Lundstrom et al.
patent: 4194581 (1980-03-01), Walter

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