Device for placing a radioactive source in a formation through w

Details Device for placing a radioactive source in a formation through w Device for placing a radioactive source in a formation through w

1988-03-04

1990-04-10

Hannaher, Constantine

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

89 115, 250259, G01V 500

Patent

active

049163124

ABSTRACT:
The present invention relates to a device for placing a radioactive source into a formation through which a borehole passes. The device includes a gun barrel, a bullet containing a radioactive source and engaged in the barrel, and an explosive device for propelling the bullet towards the formation. The device further includes two items which reduce the speed at which the bullet, when fired, penetrates into the formation. These items are a spacer, placed in the barrel between the bullet and the explosive device, and a braking shield placed at the port end of the barrel. The spacer reduces the effect of the gases produced by the explosive device upon detonation. The braking shield is entrained with the fired bullet, the front end of the shield producing drag which also acts to retard the forward propulsion of the bullet. The shield is designed to break away from the bullet upon formation impact, further reducing the kinetic energy of the bullet. The invention is applicable to soft formations.

REFERENCES:
patent: 2218802 (1940-10-01), McCullough
patent: 2308006 (1943-01-01), Hendrickson
patent: 2327141 (1943-08-01), Spencer
patent: 2328247 (1943-08-01), Alexander
patent: 2328308 (1943-08-01), Turechek
patent: 2340966 (1944-02-01), Kitsman
patent: 2565788 (1951-08-01), Tow
patent: 2592434 (1952-04-01), Krassnow
patent: 3367429 (1968-02-01), Porter
patent: 3419089 (1968-12-01), Venghiattis
patent: 4185702 (1980-01-01), Bullard

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