Well fluid sampling tool and well fluid sampling method
US5901788A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1997 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Jun 16, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B36/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well fluid sampling tool and method for retrieving reservoir fluid 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 temperature of the sampled well fluid is maintained at or near initial as-sampled temperature to avoid the volumetric shrinkage otherwise induced by temperature reduction, mitigate precipitation of compounds from the sample, and/or maintain the initial single-phase condition of the sample. The sample chamber is thermally insulated, provided with a storage heater, electrically heated, given a high hear capacity, and/or pre-heated to sample temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.