Hydraulic system in formation test tools having a hydraulic pad pressure priority system and high speed extension of the setting pistons
US4879900A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Jul 5, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A formation tester is set forth. The device utilizes a snorkel extending from the formation tester to obtain a pressure test and collect samples from a formation of interest. The apparatus includes multiple sample storage containers, thereby cooperating with an equalizing valve to selectively isolate the snorkel from fluid and fluid pressures in the well. A control valve system in a hydraulic circuit operate backup shoes and a snorkel seal until testing is over to assure sealing against well fluid invasion in unconsolidated formation. A speed up sequence for both the backup piston and cylinder arrangement as well as the pad setting piston and snorkel arrangement is illustrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.