Design of pdc drill bits and their operating modes using a new method for quantitative assessment of dynamic rock hardness
Date Issued
2025
Author(s)
Lyulchenko A. V.
Editor(s)
Korovyaka Ye. A.
Abstract
The efficiency of oil and gas well drilling in Ukraine is critically important amid efforts to achieve energy independence and counter external aggression. PDC (polycrystalline diamond compact) bits dominate the industrial drilling volume, accounting for 75–85% in regions like the Dnieper-Donets Basin, Carpathians, and Black Sea shelf. Their advantages include high wear resistance, penetration rates, and suitability for horizontal drilling in unconventional reservoirs such as shale gas and tight gas. However, initial bit selection based on static geological data often leads to inefficient rock failure, increasing drilling time by 15–25% and costs by up to 10–12 million UAH per well. The core issue is the inaccurate assessment of dynamic rock hardness, a key parameter determining resistance to the cutting-chipping action of PDC cutters. Traditional methods, such as those by Shreiner, Protodyakonov, or OST 41-89-74, focus on static indentation or impact crushing, neglecting the combined axial and tangential forces in real drilling, where rock properties vary by ±2.5% due to anisotropy, fracturing, and hydrostatic pressure [1, 2].
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