Hydraulic underreamer and sections for use therein

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

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 7/18 (2006.01) E21B 7/28 (2006.01) E21B 10/26 (2006.01) E21B 10/60 (2006.01) E21B 29/00 (2006.01) E21B 33/12 (2006.01)

Patent

CA 2487155

A hydraulic underreamer for enlarging a wellbore (18) includes improved packer (20), cutting (24), jet pump (26), and mill (28) sections. The packer section (20) is designed to minimize wear on its sealing elements (36, 38), the cutting (24) and jet pump (26) sections are designed to minimize pressure requirements and optimize hydraulic efficiency, and the mill section (28) has a removable center assembly which allows effective well control when pulling the underreamer out of a "live" well filled with gas, such as methane.

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