Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Patent
1977-01-24
1978-07-25
Purser, Ernest R.
Boring or penetrating the earth
With tool shaft detail
Means other than tool structure to induce fluent flow
175215, E21B 1700
Patent
active
041024184
ABSTRACT:
A borehole drilling apparatus adapted for connection to a drilling string, wherein the cuttings pass through the center of the drill bit and are adapted for conveyance to the surface through a central pipe of the drilling string, a labyrinth seal being located between the outer perimeter of the apparatus and the wall of the borehole to provide an annular region of relatively immobile or stagnant fluid around the apparatus to forestall movement of fluid upwardly and downwardly past the labyrinth seal, part of the drilling fluid being conducted in a downward direction below the seal to force cuttings toward and through the center of the drill bit for upward conveyance through the central pipe, another portion of the drilling fluid being discharged above the seal for upward conveyance through the annulus between the drilling string and wall of the borehole to the top of the latter, whereby any formation material which may drop into the borehole annulus will be forced upwardly through such annulus to the top of the hole, the formation cuttings passing toward the bit center remaining uncontaminated.
REFERENCES:
patent: 3208539 (1965-09-01), Henderson
patent: 3439757 (1969-04-01), Elenburg
patent: 3503461 (1970-03-01), Shirley
patent: 3596720 (1971-08-01), Elenburg
patent: 3638742 (1972-02-01), Wallace
patent: 3667555 (1972-06-01), Elenburg
patent: 3991834 (1976-11-01), Curington
Bakerdrill Inc.
Favreau Richard E.
Kriegel Bernard
Mosely Neal J.
Purser Ernest R.
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