Method and apparatus for milling a zero radius lateral window in casing
US9097083B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2011 |
| Grant date | Aug 4, 2015 |
| Priority date | — |
| Expiry date | Jan 1, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A flexible milling assembly for milling an orifice through a well casing. The milling assembly can include a drive yoke, and a plurality of straight and split yoke assemblies—all linked together and to a cutter head with universal blocks that enable the components to pivot relative to each other. A string of joint tubing connected to a prime mover on the surface is used to lower the milling assembly into a well and supply the driving torque. A split shoe coupled to a guide tube is positioned within the well casing where the orifice is to be milled. The milling assembly is guided through a curved passage within the split shoe to bring the cutter head into contact with the well casing. A protector assembly can be provided to enclose and protect the milling assembly when it is tripping into and out of the well casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.