Simulation of electrical sounding of the wellbore zone in the process of drilling oil and gas wells

One of the topical issues of drilling directional and horizontal wells with the use of downhole telemetry systems with an electromagnetic communication channel is the use of an electrical delimiter. It is part of the transmission system as a constructive basis for conducting electric and electromagnetic well logging while drilling. To solve this problem, it is necessary to evaluate the radial range of electrical probing near the well zone in order to determine the informativeness of the received data. A qualitative analysis of the structure of the probing electric field of the circuit and the calculation model of the logging is performed.
Materials and methods
The structure of the electromagnetic field and the radial range of the logging system will be determined by the electrical structure of the medium, the frequency of the supply voltage and the length of the insulation coating of the housing of the bottom hole telemetry system. To quantify the radial depth of penetration of electric current, a function of "depth" is introduced. Application of the theory of lateral electric well logging with bipolar probes with a multilayer structure near the wellbore geological environment.
Results
The relationships and design models are presented that allow to more reasonably approach the evaluation of the range of the real electric and electromagnetic logging systems used for drilling inclined and horizontally directed oil and gas wells.
Conclusions
1. Structure of the probing electric field of the circuit and the calculation model logging are identical. 2. Mathematical modeling of electric well logging during drilling is possible using point models of probe electrodes located in a well of "zero" diameter.