Seismic method for logging position of a deep borehole in the earth
US3979140A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1974 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Jun 3, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for logging the position of a deep borehole filled with liquid in the earth, comprising a long, continuous small diameter pipe adapted to be reeled up on a drum mounted on a vehicle, and means to insert the end of the pipe into the mouth of a borehole and to lower it to any desired depth in the earth. A plurality of geophones are positioned on the surface of the earth in the vicinity of the borehole with conventional amplifying and recording means connected thereto. Means are provided on the vehicle for compressing a liquid or gas, and injecting it into the pipe. On the bottom end of the pipe is a chamber in which this pressurized fluid can be stored. Fast acting valve means are provided which on signal can suddenly open and permit the stored fluid in the chamber to explosively expand into the liquid in the annulus of the borehole. Such explosive injection of the fluid from the chamber into the well will cause a seismic wave to be generated which will expand until it reaches the surface and is detected and recorded by the geophones. Electrical control wires may be carried in the pipe means by which the valve can be timed and controlled, so that the travel times…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.