Underreamer for increasing a wellbore diameter
US9631434B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2014 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | Apr 2, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/28
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An underreamer for increasing a diameter of a wellbore. The underreamer may include a body with first and second cutter blocks coupled to the body. The first cutter block may have a recess formed therein, and the second cutter block may be positioned in the recess. The first and second cutter blocks may move between retracted and expanded states. In the retracted state, the first and second cutter blocks may have an outer diameter less than or equal to an outer diameter of the body. In the expanded state, the first and second cutter blocks may have different outer diameters, with each being greater than the outer diameter of the body. A method may include running the underreamer into a wellbore, expanding the first and second cutter blocks, and moving the underreamer axially in the wellbore to increase the diameter of the wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.