Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1980-11-28
1983-02-15
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175325, E21B 1200, E21B 1700
Patent
active
043735924
ABSTRACT:
An arrangement for alleviating the problem of differential sticking of a drill string in rotary drilling of a highly deviated borehole by grinding and reducing the size of the cuttings generated by the drilling operation to enable the mud-return flow to better remove the cuttings from the wellbore. At least one full gage, rotating stabilizer-grinder is placed along the drill string at a selected point in the high angle section of the hole. In one embodiment, this stabilizer-grinder is constructed with an inner mandrel which is part of and rotates with the drill string and powers the first part of the grinder, and an outer mandrel which is free to rotate separately from the inner mandrel. The outer mandrel is full gage and fits against the borehole wall such that it remains stationary with respect thereto. The outer mandrel thus forms the second part of the grinder on which cuttings are broken and reduced in size. In another embodiment, a downhole turbine mud motor powers a grinder positioned just above the downhole drilling collars.
REFERENCES:
patent: 2450223 (1948-09-01), Barbour
patent: 4296970 (1981-10-01), Hodges
Dellinger Thomas B.
Kelly, Jr. John
Falk Joseph
Gilman Michael G.
Huggett Charles A.
Mobil Oil Corporation
Novosad Stephen J.
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