Apparatus for carrying out underground measurements during drilling of underground strata
US3991610A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Nov 6, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention concerns apparatus for performing underground measurements during drilling of underground strata using conventional measuring instruments. It comprises a closed instrument casing filled with oil, an adaptor coupling the casing to the drilling pipe, a spring holder connected to the instrument casing and carrying damping spring means, a helical plate controlling angular displacement and a piston-and-cylinder displacement control device, a first bore in the adaptor for conveying mud to a downward section of the drilling pipe, a second closable bore in the adaptor for permitting mud to flow from the annular space around the pipe through the instrument casing, and a closable bore in the instrument casing for communicating the pressure in the interior of the drilling pipe to the instrument casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.