Focused nuclear interface survey instrument and method of determ

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

Patent

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Details

250257, 250268, 250269, G01V 500

Patent

active

043429114

ABSTRACT:
The instrument and method locate anomalies and the interface between two materials having little difference in their density in a mining or storage well. More particularly, the method comprehends the generation of gamma rays and the detection of scattered rays at a point spaced from the point of generation of the gamma rays. By moving the points of generation and detection through the well, there will be observed a pronounced change in the detection rate of the scattered gamma rays when various interfaces and anomalies are traversed.
The focus interface instrument includes a decentralizer, collar locator, electronics assembly, detector, and radiation generator, all enclosed in a nonmagnetic stainless steel housing except for the electronics assembly whose housing is made of tubular steel. The radiation generator has a radioactive source which emits gamma rays, and the detector detects those rays reflected back to the detector. The detected rays are counted by electronic equipment at the surface and recorded on a log. The radioactive source is shielded within the tool by heavy metal (density greater than lead) to focus and concentrate the gamma rays through restricted vertical and horizontal angles of radiation. The tool provides for the collimation of the original and the scattered gamma ray beams for better definition of the density changes.
In operation the instrument is lowered to the bottom of the well on a cable having an electronic connection between the tool and the electronic equipment at the surface. The decentralizer locates the tool against the inner wall of the tubing and the radioactive source emits gamma rays through the tubing, any casing strings and into the well. The gamma rays impinge upon the molecules of the materials around the radioactive source and the number of rays reflected back to the detector are counted by the electronic equipment at the surface. The density changes of the various materials and anomalies around the tubing are determined by the change in the gamma ray count as the total is traversed through the tubing.

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