METHOD OF DRILLING REGIME PARAMETERS SEARCH UNDER CERTAIN GEOTECHNICAL CONDITIONS

MINING ENGINEERING

Abstract

In practice, in the geological cutting of the same well, a sequence of rocks with different physical and mechanical properties can be found, which makes it impossible to drill all the rocks with the same crown bit at high speed. Besides, the crown bit wears quickly because of inadequacy of rocks, and the frequent change of the bits, according to the rocks, leads to the increase of the time spent on additional actions, to the decrease of the work productivity, and the increase in the prime cost of 1m of well drilling. Thus, it can be concluded that in frequently alternating rocks with different physical and mechanical properties, the efficiency of well drilling can be improved based on the comparative analysis of the maintenance indices of diamond rock-breaking tools. In this paper, based on the investigation of impregnated diamond bit labour capacity indices applied under certain geological and technical conditions, a method of searching for
optimal values of the drilling regime parameters of wells with high indices of rock destruction tools is proposed. In the course of studies, the impregnated diamond bits produced in the RF, and by the leading world-famous western companies (like AtlasCopco, Dimatec, Boart Longyear, Fordia, HARDCORE and Global Getech) have been investigated To search for the rational values of the well-drilling condition main parameters, theoretical calculations and time-dimensional records have been carried out. As a result of this, it has become possible to increase the maintenance indices of diamond rock-destruction tool by changing the axial load and the rotational speeds of the drill bit.