In or relating to well abandonment and slot recovery
US12338701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2022 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Jul 14, 2042 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Method of removing casing from a well, in which an annulus between the outside of the casing and the inside of a surrounding downhole body is at least partially filled by debris, the perforated section of casing is washed in casing lengths shorter than the perforation length and an attempt made to pull the casing after each shorter length is washed. If the casing is free after washing only a shorter section of the perforated section of casing then it can be recovered and saves the washing time. A bottom hole assembly is described which includes a downhole power tool to exert a greater force to pull the section of casing between washing steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.