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2 027 858

(13)

(51)

IPC

(21) (22)

Application

4862035/03, 1990-09-05

(22)

Actual filing date

1990-09-05

(45)

Published

1995-01-27

(72)

Inventor

Makarevich Dmitrij Mikhajlovich[By]Kutilkin Petr Nikolaevich[By]Rutskij Mikhail Ivanovich[By]Tuluevskij Nikolaj Vladimirovich[By]

(73)

Holder

Mogilevskij Mashinostroitel'Nyj Institut

SET FOR DRILLING LARGE-SIZED WELLS Russian patent published in 1995 - IPC

Abstract RU 2027858 C1

FIELD: drilling. SUBSTANCE: face engines are provided with reducers with different ratio for drilling large-sized wells at trying drill bits out with different power intensity. EFFECT: improved efficiency. 3 dwg

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RU 2 027 858 C1

Authors

Makarevich Dmitrij Mikhajlovich[By]

Kutilkin Petr Nikolaevich[By]

Rutskij Mikhail Ivanovich[By]

Tuluevskij Nikolaj Vladimirovich[By]

Dates

1995-01-27—Published

1990-09-05—Filed