Analysis and identification of a drilling fluid column based on decoding of measurement-while-drilling signals
US5055837A · kind A · utility
16Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1990 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Sep 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H17/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention comprises a method and apparatus for estimating and identifying the channel filter characteristics of the drilling fluid communictions channel (e.g. standpipe) based on surface decoding of the MWD data signal. The channel filter characteristics can be mathematically defined by the transfer function of the channel. The transfer function is a mathematical model defining the input-output relationship of a physical system. The present invention may also characterize the channel filter defined by the drilling mud in the annulus between the borehole and the drillstring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.