Authors: L.E. Mametyev, A.A. Khoreshok, A.M. Tsekhin, A.Yu. Borisov

Title of the article: The results of experimental studies of two-stage cutter-disk well expander

Year: 2018, Issue: 6, Pages: 47-53

Index UDK: 622.24.051.57

DOI: 10.26730/1816-4528-2018-6-47-53

Abstract: Relevant in the present time are researches to improve the process of drilling degassing wells in over gas-bearing seams, questions decision of removal of destruction products from the bottom-hole zone of the well and transportation of these products by auger drilling rig inside the well. The release of methane from the coal seam increases the probability of emergency gassing of mine workings and requires reduction in dust formation in the well by reducing the specific weight of fine fractions of destruction products. Geometrical parameters of a design of the combined reamer wells including cut and disk stages are proved. Energy and force parameters at various modes of process well-drilling are defined. Researches of the experimental reamer at the full-size stand and in mine conditions have shown that use of the slot-hole scheme of destruction of the well bottom by the cutters of the first stage and also the disk tool of the second stage with an bench form of a face allow to reduce significantly an exit of small classes of destruction products (0–1 mm; 1–6 mm) in comparison with the existing reamers with the continuous scheme of destruction. Regularities of change of efforts cutting of cracks Pz, energy consumption Hw, torque M, speed of drilling V, power input N at various drilling modes and design versions of the reamer are established. In the process of the bench researches geometrical parameters of the disk tool and rational installation scheme relative to the step surface of the well bottom are determined. The dependence of fractional structure of destruction products for the second disk stage of the reamer from effort of feed Pп is established. Dependences M = f(Pп) and V = f(Pп) are approximated by linear expressions. The purpose of work is justification of geometrical and regime parameters of the first and second stages of the rea-mer which will allow to reduce an exit of small fractions of destruction products and increase well-drilling speed in comparison with earlier applied designs.

Key words: destructible massif drilling reamer well energy and force parameters fractional structure products of destruction

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