Well abandonment and slot recovery
US11053761B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 2018 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | May 3, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/134
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for single-trip casing cutting and pulling for well abandonment and slot recovery. Perforations (28) are made in the casing (12) at a maximum depth using a punch tool (18) and a pulsed fluid circulated through the perforations (28) to determine a return at surface. In the event of a return at surface being detected, the casing (12) is cut and then pulled with assisted vibratory action. When no return is detected, perforations (28) are made at increasingly shallower depths until a return is detected and the casing (12) is then cut and pulled. This ensures the maximum length of casing (12) is cut and pulled on a single trip in the well bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.