Well fluid sampling tool
US5337822A · kind A · utility
Inventors
Key dates
| Filing date | Aug 17, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Aug 17, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/082
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well fluid sampling tool and method for retrieving single-phase hydrocarbon samples from deep wells. The sampling tool is lowered to the required depth, an internal sample chamber is opened to admit well fluid at a controlled rate, and the sample chamber is then automatically sealed. The well fluid sample is immediately subjected to a high pressure to keep the sample in its original single-phase form until it can be analyzed. The sample is pressurized by a hydraulically-driven floating piston powdered by high-pressure gas acting on another floating piston. Once sampling is initiated, e.g. by an internal clock, the entire sequence is automatic. Also disclosed is a sample transfer container for securing the pressurized sample from the tool and maintaining it in single-phase form during transport to an analytical laboratory. This invention avoids the disadvantages arising from phase separation of hydrocarbon well fluid samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.