Hydraulic circuit for use in wireline formation tester
US4845982A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1987 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Aug 20, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a formation tester constructed with an extendable probe driven by hydraulic means, the means being connected to a hydraulic circuit, an improved apparatus is set forth which includes a hydraulic fluid multiplier means. This multiplier means is connected between the pump and the means extending the probe and backup shoes. The multiplier means incorporates a step piston and a large cylinder having a step conforming with the piston. Suitable seals are placed on the piston. The piston drives initially to deliver a high volume low pressure flow to extend rapidly the probe, and completes its operation with a low volume high pressure flow to assure proper setting. This enables more rapid operation and more rapid completion of formation testing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.