DEVICE FOR DRILLING WELLS Russian patent published in 1994 - IPC

Abstract RU 2021514 C1

FIELD: mining; drilling wells of large diameter. SUBSTANCE: device has body with axial channel and rock cutting member and centering members. Device is furnished with additional body of sleeve type located concentrically to main body. Attached to additional body are rock cutting member and centering members made in form of tubes with plugs. EFFECT: extended functional capabilities. 1 dwg

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RU 2 021 514 C1

Authors

Li S.Ch.

Popov A.N.

Liberman V.I.

Gorbunov V.A.

Konjukov N.F.

Dates

1994-10-15—Published

1991-03-29—Filed