Apparatus for pulling tools into a wellbore
US4071086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1976 |
| Grant date | Jan 31, 1978 |
| Priority date | — |
| Expiry date | Jun 22, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/001
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pulling tool apparatus for helping equipment descend down a wellbore, such as logging tools being dropped into a deviated wellbore. A first embodiment employs a mass slidably located inside the pulling tool which is acted on so that it is propelled in an upward direction at a fast rate and then propelled in a downward direction at a slow rate so that the net effect of the moving mass on the logging cable is to pull it in a downward direction because of the reaction forces exerted on the tool itself by the moving mass. An alternative embodiment is provided wherein the mass is driven downward against a stop plate to create the downward force for the pulling tool. An additional feature to improve performance is a set of fins surrounding the outside of the pulling tool which will fold when the tool moves in a downward direction and will open up to offer resistance to motion in an upward direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.