Downhole hydraulic control system
US7681665B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Jul 5, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A purely mechanical hydraulic control system includes at least one drilling fluid chamber and a hydraulic fluid chamber. A system pressure spring is deployed in one of the drilling fluid chamber(s) between a positioning piston and a system pressure piston. The spring is disposed to pressurize oil in the hydraulic fluid chamber via applying a spring force to the system pressure piston. When the system is actuated (e.g., via turning on the mud pumps), the positioning piston is urged in place against a stop (e.g., a shoulder) thereby compressing the system pressure spring and pressurizing oil in the hydraulic chamber. The invention advantageously converts highly variable drilling fluid pressure to a near constant pressure hydraulic fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.