Propulsion unit for wellbore tractor tool
US11466525B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2018 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Dec 10, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A propulsion unit for a wellbore tool includes a tool body and at least one wheel section disposed along the tool body. The wheel section comprises a tractor pad movably coupled to a tractor housing coupled to the tool body. The tractor pad is movable only in a lateral direction with respect to the tool body. A wheel rotatably is supported in the tractor pad so as to contact a wall of a wellbore when the tractor pad is moved away from the tractor housing. An hydraulic motor is rotationally coupled to the wheel. The hydraulic motor comprises a displacement changing element operable to change displacement of the hydraulic motor. The unit comprises means for moving the tractor pad between an extended position and a retracted position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.