Method for recovering tubular structures from a well and a downhole tool string
US10240420B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 2015 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | Dec 15, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/001
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This invention relates to a method for recovering a tubular structure (3) from a well (1), wherein a so-called free point is defined as the location where the tubular structure is stuck in the well. The method comprising providing a downhole tool string comprising a pipe-severing tool and an upper part of the downhole tool string; lowering the downhole tool string into the tubular structure to release the free pipe. Before the step of triggering the pipe-severing tool to sever the tubular structure, the method includes releasing the pipe-severing tool and subsequent withdrawing the upper part, of the downhole tool string away from the free point towards the surface over at least a predefined distance. The invention relates to a downhole tool string for use in such method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.