NEW TYPES OF WELL RESISTIVITY -METERS 



389 



K' is a certain constant determined by the geometric parameters of 

 the resistivity -meter. 



It follows that with a rearrangement of the electric field a change in the 

 relative current density the resistivity -meter coefficient also changes. 



The rearrangement of the electric field in a well resistivity-meter with 

 a change in the salinity of the fluid is shown in Fig. 3, ^vhere there are shown 

 diagrammatically the lines of force in a resistivity -meter GML BGK placed 

 in a strongly and a weakly saline fluid, respectively. 



Fig. 3. The distribution of the Hnes of force in an electric field depending on 



the salinity of the fluid in a well resistivity-meter GML BGK (diagrammatic plan). 



1 — in a strongly saline fluid; 2 — in a weakly saline fluid. 



In a strongly saline fluid the lines of force of the electric field are distrib- 

 uted relatively uniformly. In changing over to the weakly saline fluid, when 

 its specific resistance grows much faster than the contact resistance, the lines 

 of force of the probes electric field become denser in the direction of the 

 shortest distance to the metallic surfaces. This leads to a decrease in current 

 density in the region of the measuring electrodes and consequently to the 

 lowering of the potential difference being measured, thus causing the growth 

 of the coefficient. The considerable increase of the GML BGK resistivity -meter 



