Sampling resistivity of formation fluids in a well bore
US4962665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Sep 25, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Formation fluid is received in and passed through a sonde supported by an armored well logging cable at a depth of interest in a well bore. Periodically, samples of the formation fluid are taken. Higher density portions of the fluid, which represent formation fluid and/or mud filtrate, are separated. The separated fluid is a sample from which the resistivity is measured. As sampling continues, the sample fluid becomes substantially formation fluid and an apparent R.sub.2 measurement is made. An electrical signal indicating the R.sub.2 at the depth of interest is sent to the surface for recording and further processing. R.sub.2 measurements can be taken at any desired number of depths of interest in the well bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.