One trip milling system
US5771972A · kind A · utility
56Cited by
26References
44Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1996 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | May 3, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The mill assembly and whipstock assembly include a mill having a tapered end which engages a ramp of the whipstock assembly. The ramp includes a plurality of surfaces having different angles whereby the rate of deflection of the mill by the whipstock varies as the mill is lowered into the borehole. In particular, the ramp of the whipstock includes two surfaces having steep angles, one steep angled surface causing the mill to punch through the wall of the casing and the second steep angle surface moving the center of the mill across the wall of the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.