DEVICE FOR DRILLING BOREHOLES IN SEA BOTTOM Russian patent published in 1997 - IPC

Abstract RU 2071541 C1

FIELD: mining industry. SUBSTANCE: device has inserted downface motor mounted in tube string foot. Body of motor is fixed in working position against turning relative to tube string. Connected to motor shaft is leading rock crushing tool, and expander is installed on tube string foot. String is made of casing tubes, and expander is installed on foot with possibility of free rotation on radial- thrust bearing. EFFECT: high efficiency. 1 dwg ЫЫЫ1

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RU 2 071 541 C1

Authors

Ioanesjan Ju.R.

Dates

1997-01-10—Published

1993-11-04—Filed