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2 021 478

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IPC

(21) (22)

Application

4951775/03, 1991-06-28

(22)

Actual filing date

1991-06-28

(45)

Published

1994-10-15

(72)

Inventor

Ehdel'Man Ja.A.

(73)

Holder

Nauchno-Issledovatel'Skij Institut Burovoj Tekhniki

COLLET-TYPE CORE CATCHER Russian patent published in 1994 - IPC

Abstract RU 2021478 C1

FIELD: drilling equipment. SUBSTANCE: collet-type core catcher is made in form of ring with conical outer surface and cylindrical inner surface. Provided over ring conical part is cylindrical shank. Slot is made over entire height of core catcher widening from bottom upward or from top downward. Core catcher with slot widening from bottom upward is designed for operation in poorly cemented, fissured rocks, and that with slot of opposite taper, in hard rocks. EFFECT: higher efficiency. 2 dwg

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RU 2 021 478 C1

Authors

Ehdel'Man Ja.A.

Dates

1994-10-15—Published

1991-06-28—Filed

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