Downhole flow diversion device with oscillation damper
US10544637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2015 |
| Grant date | Jan 28, 2020 |
| Priority date | — |
| Expiry date | Nov 30, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A device for limiting the flow of drilling fluid through a section of drill string is described. The device includes a cylindrical tube with holes in its periphery. Flow enters the device through an upper end of the tube and a portion of the flow exits through the lower end of the tube. In addition, some of the flow is diverted through the peripheral holes. A valve piston is supported near the lower end of the tube by a spring of approximately constant force through its range of travel. The valve piston moves axially as the flow rate through the tube changes flow rate to ensure that a substantially constant amount of flow exits through the lower end, while the excess flow is diverted from the tube through the peripheral holes. A means of damping or stopping the axial movement of the valve piston is included in the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.