Livinskyi A. Improvement of the technology of directional drilling by using combined drilling method

The work provides the structural features and technology for the application of typical structures of oriented and non-oriented BHA's. The paper explains the role of providing trajectory parameters of their curvilinear and rectilinear intervals with changing the angular parameters of the axis of the wellbore under existing drilling methods. The attention is focused on oriented BHA's based on the Positive Displacement Motor (PDM), for which mathematical models of calculation, criteria of their designing and selection for the variable technical and technological parameters of directional drilling are systematized. According to the results of analytical studies, the dynamics of change in the static characteristics of the interaction of elements of the oriented BHA's under the influence of various values of the inclination, PDM bent, weight on bit, the number of stabilizers. The ranges of change of these quantities and ways of their management are determined. The technique of forecasting energy costs in the working process of oriented BHA with different numbers of stabilizers in the directional wellbore has been improved. Their essence is related to overcoming the rotational resistance and axial movement of the oriented BHA's in the conditions of the combined drilling method according to the information on geological and technological conditions. The approbation of the main results of the scientific researches in the production environment and confirmed their practical value according to projecting and selection of the oriented BHA's for the drilling of horizontal well #258 of Gnidynthivske and #535 Bugruvativske fields and reached high indexes together with keeping the projected well profile. Per the results of the researches there have been developed "Technological regulations of the order for the drilling directional and horizontal wells" TP 31174865.001:2016 that passed the approbation during drilling of the wells and implemented in the RTE "BurovaTechnika" LLC together with "The methods of calculation oriented BHA's for the combined drilling method" and "Method of calculation of the torque of the drilling string inertion for the rotary and combined methods of the well drilling" which are implemented in "Endevour" LLC.