Spaced weight relieved drill collar string

Details Spaced weight relieved drill collar string Spaced weight relieved drill collar string

1978-03-22

1980-02-26

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

175 61, 64 1R, E21B 1700

Patent

active

041901223

ABSTRACT:
A drill collar string is provided for use in the drilling of a well. The string comprises a plurality of drill collars having straight tubular sections vertically spaced apart along the length of the string. Each of the sections are weight relieved along one side thereof to produce an eccentric weighting of the sections such that they act to maintain the drill collar string so that it has little, if any, rubbing contact with the sides of the borehole. Such a drill collar string is also provided with a lowermost drill collar which is likewise eccentrically weighted so that the overall combination can increase drilling rates over those afforded by standard slick drill collars and winged stabilizers.

REFERENCES:
patent: 3382938 (1968-05-01), Williams, Jr.
patent: 3391749 (1968-07-01), Arnold
patent: 3880246 (1975-04-01), Farris
patent: 4068730 (1978-01-01), Arnold

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