发明名称 |
GAIN STABILIZED NATURAL GAMMA RAY DETECTION OF CASING THICKNESS IN A BOREHOLE |
摘要 |
A gain stabilized natural gamma ray spectroscopy system is used to measure casing thickness in a cased well borehole. A ratio of gamma ray intensity in two selected energy ranges forms a measurement signal representative of casing thickness based on the photoelectric absorption of natural gamma rays by iron. A coincidence technique employing dual scintillation crystals (51, 57) and a stabilization source (58) of charged particles and known energy gamma rays is used for gains stabilization, the particles and gamma rays coincidentally-emitted by this source (58) being detected by the respective crystals (57, 51) and a circuit (64) testing for coincidence so that the gain stabilization can be effected in accordance with the measured value of these known energy gamma rays. |
申请公布号 |
DE3464662(D1) |
申请公布日期 |
1987.08.13 |
申请号 |
DE19843464662 |
申请日期 |
1984.04.06 |
申请人 |
HALLIBURTON COMPANY |
发明人 |
SMITH, HARRY DAVIS, JR.;ROBBINS, CARL ARTHUR |
分类号 |
G01T1/40;G01V5/06;(IPC1-7):G01T1/40;E21B47/08 |
主分类号 |
G01T1/40 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|