Head assembly and a valve system for use in a core drilling system
US9926757B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 2014 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Mar 11, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A valve system for an inner tube assembly is described. The inner tube assembly is arranged to be used in a drilling system to retrieve a core sample, and is arranged to be insertable into a drill string of the drilling system at a first end of the drill string. The valve system is arranged to be configurable in a first closed configuration, an open configuration, and a second closed configuration. The valve system moves to the first closed configuration when fluid is pumped along an interior region of the drill string towards the inner tube assembly in a direction from the first end of the drill string to the inner tube assembly. The valve system is arranged such that, when in the first closed configuration, a pressure of the fluid increases to facilitate deploying the inner tube assembly towards a second end of the drill string. The valve system moves to the open configuration in response to the inner tube assembly reaching a vicinity of the second end of the drill string and being prevented from moving further towards the second end of the drill string. The valve system is arranged such that, when in the open configuration, fluid can flow to a drill bit located at or near the se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.