METHOD OF NUCLEAR MAGNETIC LOGGING AND DEVICE FOR ITS IMPLEMENTATION

摘要

The method of nuclear magnetic logging and the device for its implementation relate to the field of exploration of wells using nuclear magnetic resonance. The method of logging consists in the fact that the device for logging is moved along the borehole with two coaxially placed cylindrical main permanent magnets, oriented with the same poles to each other, creating a constant magnetic field, in the studied area in the rock mass, in the same area by setting the current in the magnetizing The coils create an additional magnetic field, which compensates for the temperature dependence of the magnetic induction of permanent magnets, and in the same region, an alternating magnetic field is created with a radio frequency transmitting and receiving coil, polarized perpendicular to the constant magnetic field. The method makes it possible to expand the range of logging rates while maintaining the ability to adjust the value of the focused magnetic field in the study area during logging to compensate for the temperature dependence of the residual induction of permanent magnets without deteriorating the characteristics of the depth of study.