Enhancing drilling efficiency and wellbore stabilization with an innovative drill bit design

UDK: 622.24

DOI: 10.24887/0028-2448-2025-10-32-36

Key words: two-tier drill bit, well drilling, bottomhole cleaning, wellbore stabilization, drill string vibrations, helical ribs, helical channels, cuttings removal

Authors: G.G. Gilaev (Kuban State Technological University, RF, Krasnodar); V.V. Klimov (Kuban State Technological University, RF, Krasnodar); S.V. Usov (Kuban State Technological University, RF, Krasnodar); M.S. Al-Edresi (Kuban State Technological University, RF, Krasnodar); R.G. Gilaev (Nizhnevartovsk branch of Industrial University of Tyumen, RF, Nizhnevartovsk)

The effectiveness of well drilling is determined by the design of the rock-breaking tool and the quality of bottom hole cleaning. This article analyzes technical solutions and proposes a new design for a two-stage drill bit. This design aims to improve the efficiency of drilling wells by providing more effective cleaning of the wellbore and preventing secondary grinding of the cuttings. A unique feature of this design is the integration of rock-breaking and stabilizing elements with helical ribs and channels with a variable pitch. It ensures an accelerated flow of drilling mud without the formation of mud rings. The stabilizing section eliminates local bends and ledges, stabilizes the wellbore, reduces lateral vibrations, and acts as a screw pump. This screw pump helps detach cuttings from the bottom, which prevents their secondary grinding and the formation of «cuttings beds». The absence of sharp bends in the blades creates favorable conditions for the operation of the two-stage bit, and the increase in the cross-section of the blades from bottom to top also helps increase its durability. There are following advantages of two-stage bit use: reduced possibility of sticking; reduced vibrations and increased tool life; increased penetration rate per bit; reduced number of tripping operations and contact time between casing and drill strings; reduced compressive loads, mechanical stresses and wear on drilling and intermediate casing strings. The advantages of this two-stage bit predetermine the improvement of the main indicators of the drilling process and enable to recommend it for practical use.

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