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FRAGMENTS OF ENGINEERING - ANALYTICAL PROVISION OF GEONAVIGATION TECHNOLOGY OF HORIZONTAL TRUNK OF OIL-GAS RESERVOIR WITH A PULSE ELECTROMAGNETIC FIELD
Abstract
Task of advancing geonavigation becomes an actual topic when constructing a horizontal trunk of oil and gas reservoir of geophysical studies of horizontal wells. Advancing geonavigation allows to predict intersection of trunk with boundaries of oil-gas reservoir. Mathematical model of unsteady electromagnetic field of a horizontal conductive plate is approximated by the known plane ???? and excited by a horizontal magnetic dipole; Plane ???? is transformed into a vertical half-plane ???? by dynamic method of mirror images. Engineering-analytical model is constructed by computational experiment and modeling. It describes an unsteady electromagnetic field and magnetic flux of a thin vertical conductive plate which is excited by a vertical magnetic dipole (technology of electrical profiling by the method of transient processes and probing by the formation of a field in the near zone - the simulation model of intersection of sensor with reservoir wall). Dynamic method of mirror images is applied to the known qualitative model that describes inclined plane ???? one of the sides of intersecting surfaces is considered as the plane of symmetry. The obtained models are subjected to computational experiment and modeling. Shapes of graphs profiling over the conductive reservoir are similar to those obtained by physical modeling, i.e. engineering-analytical model is adequate to known models and, thus, the quantitative model of the inclined plane seems fair. We present analytical models of pulse magnetic flux over inclined plane ????, which is obtained by vector addition of magnetic flux fields of a vertical magnetic dipole and a horizontal magnetic dipole in coordinate system rotated by angle of inclination of the half-plane ???? and then returning to the original coordinates. These models expand and strengthen the theoretical and methodological base of the geonavigation technology by pulsed electrical prospecting.
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