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Direct Conductance Method of Measuring Casing Lengths
Author(s) -
Ross Sylvia H.,
Adcock Gerald
Publication year - 1969
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1969.tb01288.x
Subject(s) - casing , conductance , materials science , current (fluid) , petroleum engineering , wellbore , geotechnical engineering , geology , engineering , electrical engineering , mathematics , combinatorics
The standard water‐level indicator can be easily and inexpensively modified so that it also measures casing lengths. The simple modification permits electrical current from one wire of the two‐wire probe to be routed through the metal casing. The semiquantitative method works well with most metal casings, including nonmagnetic ones, and can be used to detect most casing reductions. The method is limited in that it works only below the water level in the well, and in that it cannot easily detect casing reductions when the conductance between the upper and lower casings is low.