Well abandonment and slot recovery
US11047193B2 · kind B2 · utility
1Cited by
9References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 2018 |
| Grant date | Jun 29, 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 fluid circulated through the perforations to determine a return at surface. In the event of a return at surface being detected, the casing (12) is cut and pulled. When no return is detected, perforations 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 (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.