Off bottom flow diverter sub
US9932788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2015 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Dec 4, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An off bottom flow diverter subassembly. A fronthead and shank each includes a central bore. One of the shank and the fronthead has an outer diameter configured to fit within the central bore of another of the fronthead and shank. The shank and fronthead are arranged to slide longitudinally with respect to each other and are limited from sliding out of contact with each other. At least one diverting flow passage is between adjacent sliding surfaces of the shank and fronthead. Sliding the fronthead and shank with respect to each other opens and closes the diverting flow passage. Application of a force, sufficient to open the diverting flow passage, to a drill string to which the subassembly is attached in a direction toward an opening of a hole being drilled causes the diverting flow passage to open and drilling fluid to flow out of the subassembly away from the bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.