Downhole pressure measurements of drilling mud
US4297880A · kind A · utility
32Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1980 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | Feb 5, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Pressure measurements of drilling mud inside the drill string and outside by transducers mounted in an instrumentation sub near the drill bit provide rapid notice of the instrusion of fluids or solids into the borehole and also permit appropriate adjusting of the mud pumping pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.