Coiled tubing injector with hydraulic traction slip mitigation circuit and method of use
US10024123B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2014 |
| Grant date | Jul 17, 2018 |
| Priority date | — |
| Expiry date | Dec 18, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
When one of at least two independently driven gripper chains (102) of a coiled tubing injector (100) begins to turn faster than another one of the injector's other independently drive gripper chains by an amount that indicates slipping of one of the independently driven gripper chains relative to tubing (109) being held between the driven gripper chains, a hydraulic timing circuit (318), which is coupled with the driven chains through hydraulic timing motors (214, 216), generates a pressure signal that causes the injector's hydraulic traction system to increase the hydraulic pressure applied by hydraulic cylinders (220) to generate a normal force applied by grippers on the chains to the tubing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.