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Prevention of the accidents based on risk analysis during well logging

Conduction of well logging is associated with the possibility of occurrence of various emergency situations. The most probable are the sticking of well-logging tools and logging cable rupture. Such events can trigger the development of emergencies. Therefore, ensuring safety during well logging is an actual and practically important task. The authors analyzed the risk of well logging activities using the method of event tree analysis. It has been found that the main causes of sticking are rapid descent of the logging probe and casing string displacement. The rapid descent of logging probes is associated with incorrect actions of the operator and damage to the well logging winch. The logging probe breakage (rupture) is associated with mechanical damage to the cable and poor connection of the probe to the cable. The authors propose a set of specific recommendations to reduce the risk of accidents and to improve the coherence of the work carried by drilling personnel and the well logging laboratory, to timely detect defects in the logging cable and to rapidly remove well-logging tools in the event of an accident.