METHOD FOR PERFORMANCE OF LOGGING WORKS IN WELL (VERSIONS) AND DEVICE FOR ITS REALISATION (VERSIONS) Russian patent published in 2012 - IPC E21B47/00 G01V3/14 

FIELD: mining.

SUBSTANCE: in one version at least one sensor of formation parameters identification (FPI) is moved into a well. An expert system is used to analyse measurement results. Logging parameters are varied based on this analysis. At the same time variation of logging parameters includes variation of specified sensor longitudinal displacement speed in a borehole on a real time basis. In one of the versions NMR signals are received from a group of sensitive volumes using a sensor on the basis of nuclear magnetic resonance (NMR) in the well. Based on these NMR signals, a part of at least one sensitive volume of the NMR sensor is identified, containing a wellbore fluid. The specified at least one sensitive volume is varied based on this identification. In another version NMR signals are received using a NMR sensor in the well. Together with the NMR signal at least one additional sensor is moved into the well, which responds to a formation property. Output signals of the specified sensors are analysed. Based on the output signals from the NMR sensor and at least one additional sensor, a part of at least one sensitive volume of the NMR sensor is identified, containing a well fluid. The specified at least one sensitive volume is varied based on this identification. The logging speed is varied based on analysis results.

EFFECT: reduction of time inputs for performance of logging, higher accuracy of measurements.

25 cl, 9 dwg