Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

Abstract

Drilling volumes should be increased in order to increase hydrocarbon production, but this is impossible without the usage of high-quality drilling tools made of modern structural materials. The study has to analyze the design, technological and operational methods to increase the performance of drilling tools made of various materials and has highlighted prospects of technological method applications. The scientific novelty of the study consists in the development of a new analytical model of PDC drill bit–well interaction. The developed model takes into account the drill bit manufacturing errors in the form of bit body–nipple axes misalignment on the drill bit strength. This result makes it possible to determine the permissible manufacturing errors to provide safe operation of the drill bit. It is established that there is an additional transverse force that presses the drill bit to the well wall in the rock due to manufacturing errors. It is determined that the magnitude of this clamping force can be significant. The material effect has been analyzed on additional clamping force. It is established that geometric imperfection of the drill bit causes the minimal effect for the elastic system of the pipe string, which includes a calibrator and is composed of drill pipes based on composite carbon fiber material, and the maximal effect—for steel drill pipes. Polycrystalline diamond compact (PDC) drill bit and well wall contact interaction during operation in non-standard mode is considered. Non-standard stresses are determined, and the strength of the blades is estimated for different values of drilling bit manufacturing error.

Effect of Exothermic Addition (CuO - Al) on the Structure, Mechanical Properties and Abrasive Wear Resistance of the Deposited Metal During Self-Shielded Flux-Cored Arc Welding

“…When designing the parts to be strengthened, pay special attention to the rational choice of materials and coatings [4][5][6][7], study of temperature distribution [8,9] and stresses in layered bodies, including bodies with defects [10-12] theoretical and experimental studies of wear processes [13,14] and tests taking into account the action of corrosive environment [15][16][17]. Technological methods provide the necessary accuracy of manufacturing parts, manufacturing errors of which lead to an increase in stress levels and cause uneven operation of the cutting elements of drill bits [18,19] and rational modes of surfacing [20,21]. Operational methods involve the use of vibration protection to improve the operating conditions of the tool [22][23][24].…”

Mining Technologies Innovative Development: Economic and Sustainable Outlook

“…Bazaluk et al [14] analyzed the constructive, technological and operational methods of increasing the productivity of the drilling tool, which is necessary to enlarge the volume of drilling and increase the production of hydrocarbons. The article presents a new analytical model of the interaction of a drill bit with a well, which takes into account the effect of imperfections in the manufacture of a bit on its strength.…”

Effect of Incomplete Replacement of Cr for Cu in the Deposited Alloy of Fe–C–Cr–B–Ti Alloying System with a Medium Boron Content (0.5% wt.) on its Corrosion Resistance

“…In this case, it is more economically sufficient and technologically easier to use the wear-resistant coating locally. The use of surfacing technologies allows to combine rationally the properties of coating materials and bases [4][5][6], providing the necessary accuracy of the parts manufacture [7]. Coating materials are used to increase the wear resistance, corrosion resistance and crack resistance of products [8][9][10].…”