Logging type subsidence detector

Details Logging type subsidence detector Logging type subsidence detector

1981-01-05

1983-08-02

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250260, G01V 500

Patent

active

043968384

ABSTRACT:
In order to determine subsurface subsidence, the incremental movement of a radioactive source buried in a formation of interest is monitored by means of a gamma detector carried in a sonde on a downhole cable or tubing. The sonde is lowered to the vicinity of the buried source in either a cased or uncased borehole. A reversing motor within the sonde moves the detector up and down so that it continuously and automatically scans the formation in the vicinity of the source. The data transmitted to the surface enables detection of very small changes in the elastic properties of formation rocks, thereby permitting early warning of significant subsidents.

REFERENCES:
patent: 3205356 (1965-09-01), Owen
patent: 3869607 (1975-03-01), Sandier et al.

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