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ArticleName Corrosion-related improvement in physical and mechanical properties of light-alloy drill pipe materials
DOI 10.17580/gzh.2019.07.07
ArticleAuthor Agliullin A. Kh., Ismakov R. A., Leonov V. V., Safraider A. I.

Ufa State Petroleum Technological University, Ufa, Russia:

A. Kh. Agliullin, Professor, Doctor of Engineering Sciences
R. A. Ismakov, Pro-Rector, Professor, Doctor of Engineering Sciences
A. I. Safraider, Post-Graduate Student,

Mavlyutov Institute of Mechanics, Ufa Federal Research Center, Russian Academy of Sciences, Ufa, Russia:

V. V. Leonov, Head of Sector, Candidate of Biological Sciences


The theoretical and practical experimental aspects of corrosion in drilling fluids are considered in the development of a general methodology for investigating the possibilities of improving the physical and mechanical properties of the promising materials to manufacture light-alloy drill pipes. The approach of macroscopic electrodynamics shows the correspondence between the descriptions of corrosion mass transfer in corrosive electrochemical systems such as drilling fluids components and alloy specimens for drill pipe. It is possible to formulate a boundary electrodynamic problem with boundary conditions for the space charge density gradient in the tested metals and alloys in drilling fluids. The approach of continuum electrodynamics provides finite expressions of the accompanying balance-charge-mass ratios of electrochemistry outside the existing atomistic (molecular) models for the studied corrosion processes. The revealed ‘nano’ boundaries of the current values constitute the limit of stable registration of vector charge transfer in the studied media. The electrodynamic approaches make it possible to measure the charge transport parameters and to quantitatively estimate the mass transfer associated with them in the investigated corrosion systems. Macroscopic parameters of charge transfer also determine the possibilities of expanding the application range for direct electrometry of ‘ion’ exchange currents at the boundary of a metal surface with a condensed medium—a liquid molecular or ionmolecular system. In the framework of improvement of drilling equipment and materials efficiency, by the electrodynamic tests of corrosion processes were conducted in evaluation of mechanical effect on metals and alloys used as materials for manufacturing of drill pipes.

keywords Drilling fluids, light alloy drill pipe, corrosive mass transfer, condensed matter, space-charge density, integral gradient theorem, electrometry of corrosion processes

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