Development of a Tool for Multi-Stage Drilling of Rising Wells

Abstract

The results of long-term scientific and practical developments of scientists of the department of mining machines and complexes of KuzSTU and employees of "Anzheromash" on improving the designs of drilling tools for drilling rising wells are presented. The multi-stage drilling process consists in the following: at the first stage, with forward flow reamers equipped with a cutting tool, wells are drilled with diameters 130 mm, 330 mm, 390 mm and 500 mm; at the second stage, with reverse flow reamers equipped with a cutting tool with diameters 850 mm and 1070 mm; at the third stage, with reverse flow reamers equipped with a disc tool with diameters 1200 mm and 1320 mm.The following advantages of the developed technical solutions are noted.The direction of improving the dust extinguishing system during drilling of rising wells is recommended, which simultaneously provides an improvement in the process of gravitational outflow of destroyed products from the bottom of the stepped form, towards the pioneer well, with subsequent exit through its mouth into the zone of placement of the rock loading device of the drilling rig.The essence of the technical solution for simplifying the installation process of the reverse flow reamer when drilling at the level of the up per drift, as well as dismantling operations in conditions of cramped space of the wellhead at the level of the lower drift, is disclosed.The description is given of the device made in the form of a three -beam support-guide balancer to increase stability and reduce the radial runout of the reamer. This will ensure a reduction in the duration, complexity of installation and dismantling operations, as well as an increase in operational speed when drilling rising wells.A technical solution is presented to improve the flow of destroyed products from the ledges in the stepped bottom of the well and to protect each attachment point of the disk tool from clogging.