Pump positioned at a drill bit
US9376874B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 2011 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Sep 13, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An ejector or jet pump is provided for use in the drilling of wells to prevent the total fluid pressure at the bottom of the borehole from reaching a level which constitutes a risk of cracking the rock or sediment being drilled, thus resulting in leakage and circulation failure. The pump is placed between the drill bit and the drill string and provided with nozzles directed in such a way that low pressure is established externally at the drill bit. The pump is operated by the drilling fluid which is supplied in the normal way through the drill string. The pressure difference across the pump is used to draw a secondary flow of drilling fluid from the borehole through internal bores in the pump to the nozzles in the drill bit. This fluid flow provides necessary cleaning of the drill bit and drilling surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.