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This article is based on results of drilling wells in Yuri Korchagin field. Interpretation of the obtained data derived the conclusions that will help to stake future wells in better geological conditions and minimize risks during construction of wells.

In this paper we describe a new approach to the development of oil and gas fields in Russia and CIS countries, which consists of integrated use of well log data while drilling and deep directional electromagnetic measurements (EM) for geosteering applications with subsequent update of the geological static model. This approach was implemented in 2016 on the offshore Filanovsky field to reduce drilling risks in the first production wells, and to refine and update the 3D static model. At the initial stage of drilling estimated structural uncertainty in the field was ± 15 m (vertical depth). The use of deep directional resistivity technology (DDR) while drilling allowed to determine bed boundaries remotely based on resistivities at vertical distance of up to 24 m (vertical depth). Based on inversion of deep electromagnetic measurements (inversion), the first wells were successfully drilled with all the geological and technical tasks completed. The obtained well log data together with inversion allowed refining of the correlation of the target beds with seismic data, and updating the velocity-depth model as well as structural surfaces of the deposit. New surfaces, together with the petrophysical interpretation of the data from the horizontal and production intervals obtained during drilling, were used to update the stochastic 3D model for subsequent reserves estimation and planning of future wells.

Oil and Gas Condensate Field. V. Filanovsky is located in the northern part of the water area of the Caspian Sea. The deposit is confined to the anticlinal uplift, characterized by a series of burst faults of fault type. The initial geological model of the deposit is based on the interpretation of 3D seismic data and GIS data in 3 reference wells. The accuracy of the position of the roof of the target productive horizon in the planning of the first horizontal well was estimated at +/-20 m vertically, according to the structural constructs. Accumulated in OOO LUKOIL-Nizhnevolzhskneft drilling experience with the use of an integrated approach to the analysis of geological and geophysical information and decision making allows successful successful entry of complex horizontal wells. Implementation of these tasks requires an easy-to-use and mastering software covering all aspects of the planning of trajectories, posting and analysis of the results of horizontal drilling of trunks. An example of the use of PetroInfoTech ProSystem software with the posting of a doublebarrel horizontal well at the deposit is presented. V. Filanovsky.

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