ELECTROMAGNETIC LWD SIGNALS AND THEIR NUMERICAL INVERSION

M. I. Epov, M. N. Nikitenko, K. V. Sukhorukova, V. N. Glinskikh, V. N. Eremin, A. A. Gorbatenko, M. A. Pavlova

We consider the development of a new electromagnetic logging tool during the process of drilling of both deviated and horizontal oil-and-gas boreholes. The high-frequency electromagnetic logging method with recording of relative amplitude-phase characteristics is realized by means of a dual-frequency multiplesonde system in the nonmagnetic metal housing. The comparative analysis of signals measured in horizontal hole is performed. An algorithm and program of numerical inversion of signal characteristics based on a horizontally-layered model of geological deposits have been developed. Authors have tested the program on practical data measured in a water-oil-saturated terrigenous reservoir drilled by a horizontal well. The test results prove the possibility of successful application of this method and VIK-PB (ВИК-ПБ) equipment to estimate the type of fl uid saturation and to solve geonavigation problems in terrigenous reservoirs of Western Siberia..

Key words: high-frequency electromagnetic logging, logging while drilling, numerical inversion of data, horizontal drilling.

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