Multistage, downhole, turbo-powered intensifier for drilling petroleum wells
US4047581A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Dec 1, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S415/903
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A turbine-powered intensifier assembly is a part of a drill collar and attaches to the downhole end of a drill string. A drilling mud stream from the drill string branches. One branch is cleaned of solid matter by centrifugal cleaners. The clean fluid drives the turbines of several stages of turbine-pump intensification and a turbine drive of the centrifugal cleaners. The turbine intakes are in parallel. Each turbine drives a pump and the pumps are staged in series so that the output of one pump becomes the input of a downstream pump. The clean fluid also supplies the pump fluid. The discharge of the final pump stage exhausts into nozzles which direct the fluid against bore hole rock at extremely high pressures and erodes the rock. Turbine exhaust and drilling mud not used in the intensification empties into the rock erosion zone to clear it of chips formed by the drilling. Fluid from this zone and dirty fluid from the cleaners pass up the annulus between the bore hole and the drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.