Hydraulic underreamer and sections for use therein

Details Hydraulic underreamer and sections for use therein Hydraulic underreamer and sections for use therein

1999-08-30

2000-10-31

Pezzuto, Robert E.

Boring or penetrating the earth

With below-ground tool drive prime mover

175215, E21B 2112, E21B 718

Patent

active

061387770

ABSTRACT:
A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minimize wear on its sealing elements, the cutting and jet pump sections are designed to minimize pressure requirements and optimize hydraulic efficiency, and the mill section has a removable center assembly which allows effective well control when pulling the underreamer out of a "live" well filled with a gas, such as methane.

REFERENCES:
patent: 4296970 (1981-10-01), Hodges
patent: 4934466 (1990-06-01), Paveliev et al.
patent: 5366030 (1994-11-01), Pool, II et al.
patent: 5494108 (1996-02-01), Palmer et al.
patent: 5505262 (1996-04-01), Cobb

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