HYDRAULIC UNDERREAMER AND SECTIONS FOR USE THEREIN

申请公布号：CA2487158(A1)

申请号：CA20002487158

申请日期：2000.02.02

申请公布日期：2000.08.17

申请人：

PHILLIPS PETROLEUM COMPANY

发明人：FRAIM, MICHAEL L.;MCCOY, STEPHEN D.

分类号：E21B7/18;E21B7/28;E21B10/26;E21B10/32;E21B10/60;E21B29/00;E21B33/12;(IPC1-7):E21B10/32

主分类号：E21B7/18

摘要：A hydraulic underreamer for enlarging a wellbore (18) includes improved packer (20), cutting (24), jet pump (26), and mill (28) sections. T he 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 requiremen ts and optimize hydraulic efficiency, and the mill section (28) has a removable center assembly which allows effective well control when pulling the underreamer ou t of a "live" well filled with gas, such as methane.

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