Multi-position mechanical spear for multiple tension cuts while removing cuttings
US8869896B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2011 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Feb 13, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cut and pull spear is configured to obtain multiple grips in a tubular to be cut under tension. The slips are set mechanically with the aid of drag blocks to hold a portion of the assembly while a mandrel is manipulated. An annular seal is set in conjunction with the slips to provide well control during the cut. An internal bypass around the seal can be in the open position to allow circulation during the cut. The bypass can be closed to control a well kick with mechanical manipulation as the seal remains set. If the tubular will not release after an initial cut, the spear can be triggered to release and be reset at another location. The mandrel is open to circulation while the slips and seal are set and the cut is being made. Cuttings are filtered before entering the bypass to keep the cuttings out of the blowout preventers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.