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Abstract
ACKNOWLEDGEMENT: The work was supported by the DAAD (German Academic Exchange Service) and by the Ministry of Science and Higher Education of the Russian Federation (The assignment #5.13496.2019/13.2). The modern stage of oil production development is characterized by an increase in the share of hard-to-recover reserves; therefore, it dictates the need for the introduction of horizontal technologies in the development of fields. Well construction with a horizontal wellbore is the most efficient way to develop such complex production targets as thin reservoir beds and low permeability reservoirs and some of them which are underlain by pressure water. Furthermore, by drilling horizontal wells there can be effectively solved the following: the development of oil deposits in waters of the seas, as well as the intensification of production and the most complete production of residual oil reserves. However, apart from the fact that a horizontal well must be successfully drilled it also must be successfully cased and cemented what is always a challenge. The inclined sections of the well profile represent highly critical points where the logy casing may occur. The centralizers installed at the verified positions can not only save and prolong the well life but also provide a reliable well support allowing high quality cementing. A series of experiments were carried out at the Trosika test stand, designed at TU Bergakademie Freiberg, which allowed distributing centralizer models into groups according to their efficiency in relation to the method of casing supply to the bottom of a horizontal well. As a result of laboratory research and analysis of information obtained experimentally, a principal model of a casing centralizer has been developed, which has the most effective support-centering characteristics of both positive and balloon-type centralizers. A technique has been developed for the basic casing attachments testing in modeling real-well conditions.
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