Method and device to free stuck objects
US7077205B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2001 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Sep 4, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of freeing stuck objects (16) from a bore (14) comprises running a string (12) into the bore (14), the string (12) including a flow modifier, such as a valve, for producing variations in the flow of fluid through the string, and a device for location in the string and adapted to axially extend or contract in response to variations in the flow of fluid through the string. A portion of the string (12) engages the stuck object (16). Fluid is then passed through the string while applying tension to the string, whereby the tension applied to the stuck object varies in response to the operation of the flow modifier and the extending or retracting device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.