Published March 2026, Pg. 19-25

Section: Well drilling

UOT: 622.276

DOI: 10.37474/0365-8554/2026-03-19-25

Design of the “window” cutting process in production casings on a guiding device

R.A. Hasanov Dr. in Tech. Sc. - Azerbaijan State Oil and Industry University

J.R. Gasymova Cand. in Tech. Sc. - Azerbaijan State Oil and Industry University

A.A. Asadova - Azerbaijan State Oil and Industry University

Sh.S. Musayev - Azerbaijan State Oil and Industry University

Based on the analysis of the interaction mechanism between the lower section of the drill string and he guiding device during the cutting of a lateral borehole from the production casing, a force analysis of the “window” milling operation on the guiding device has been conducted. For the established force spectrum, measures have been developed to eliminate energy parameters capable of causing displacement of the guiding device. To this end, the development of a locking mechanism is proposed, presented with calculation conditions for the emerging energy profile of the process and designed to withstand the arising loads. As an alternative solution, a variant of the guiding device structure equipped with the proposed locking mechanism has been elaborated for the energy profile occurring during the process. In the present study, a guiding device design is proposed featuring an inclined section composed of guide rollers that minimize friction forces and relieve the locking mechanism from loads. 
Based on the geometric model of the “window” cutting process, analytical dependencies have been obtained for determining the shape and geometric dimensions of the “window” as a function of the diameter of the casing pipes and cutting tool, as well as the angle of the guiding device. To ensure trouble-free implementation of the relevant processes in the development of “window” cutting clusters for lateral borehole drilling, the optimization problem of regime-technological parameters based on the theory of two-criteria fuzzy sets has been solved, and the obtained results have been validated through simulations for real well conditions. The mechanical milling speed and the “window” length have been adopted as the regulating factors used for the optimization process. As a result of optimization, design rules have been developed that enable increasing the efficiency and reliability of the “window” cutting technological process.

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