Retrievable bit and eccentric reamer assembly

Details Retrievable bit and eccentric reamer assembly Retrievable bit and eccentric reamer assembly

1991-08-22

1993-02-16

Dang, Hoang C.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175258, 175273, 175292, E21B 402, E21B 1032, E21B 1066

Patent

active

051862654

ABSTRACT:
A retrievable drill bit and cutter or reamer assembly includes a fluid-drive motor, an eccentric cutter part and a concentric bit in assembly and insertable in and retrievable from the interior of a drill stem without removing the drillstem from a wellbore. The eccentric cutter is disposed on a shaft connected to the output shaft of the motor and journals an accentric cylindrical bearing member mounted on the shaft. In response to rotation of the shaft in one direction, the cutter part is displaced into a position to enlarge the wellbore to permit progress of the drillstem therethrough and in response to rotation in the opposite direction, the cutter centers itself to permit retrieval of the bit assembly throught the drillstem. The fluid-driven motor engages locking splines on a sub at the lower end of the drillstem and may be inserted in and retrieved from the drillstem by drilling fluid in forward and reverse circulation, respectively.

REFERENCES:
patent: 3318387 (1967-05-01), Jones
patent: 3416616 (1968-12-01), Ahlgren
patent: 3894590 (1975-07-01), Takans et al.
patent: 4133396 (1979-01-01), Tschirky
patent: 4262762 (1981-04-01), Potratz
patent: 4616719 (1986-10-01), Dismukes
patent: 4646856 (1987-03-01), Dismukes
patent: 4651837 (1987-03-01), Mayfield
patent: 4770259 (1988-09-01), Jansson
patent: 4856582 (1989-08-01), Smith et al.
patent: 4875531 (1989-10-01), Biehl et al.

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