Strengthening and reconstruction of drilling core pipe for engineering and geological exploration
Date
2022-02-22
Journal Title
Journal ISSN
Volume Title
Publisher
Видавництво Львівської політехніки
Lviv Politechnic Publishing House
Lviv Politechnic Publishing House
Abstract
Currently, there is a tendency to increase the depth of gaseous and liquid fossils
extraction. Therefore, prospecting and developing new deposits is promising. There is also a need to
create new freshwater sources and implement relevant geological work based on this need. It is
essential to have information about the characteristics of the explored slabs and the geology of the
fields in general. Implementation of engineering and geological core drilling exploration is the most
acceptable and provides the necessary data. Here, the peculiarities of the technological schemes of
the process implementation make it possible to obtain separate sections of structures at a depth of the
drilling equipment. It is essential to use traditional equipment, recommended for decades and
provides the necessary results [1–3]. In the drilling process, you can achieve different diameters and
depths of wells execution, obtain fossil samples etc. Engineering and geological exploration drilling
is now taking on increased use in various industries [3]. Therefore, the problem of providing highquality drilling tools, the stability of their operating characteristics, and the possibility of usage in
different conditions is an urgent need today.
Modern drilling problems determine the usage of components of the core set with the
appropriate physical and mechanical characteristics. Especially it relates to elements close to the
drilling tool and the place of fossil; destruction – drill pipe. It is installed immediately after the
crown core drill and receives almost the same loads and effects during working [1–3].
Conditions for the implementation of the process of core drilling are characterized primarily
by the effect on the elements of the significant axial and twisted core set forces. There is the
influence of the corrosive and active environment of the fossil in the washing and lubricating liquids
well, etc. High temperatures are also observed at the drilling sites [3], which negatively affect the
working tool and speed up its operation.
As a result, there is an intensive shock, and abrasive core pipe wear and operation indicators
change their constructive size. As a result, it is necessary to replace the operated drill string
periodically. Considering modern technical and economic factors, it may be decided to repair a pipe
to its original size in many cases. There are tasks for providing the appropriate characteristics of the
core pipe surface. It is possible to model such properties of the new surface that functionally the best
meet the conditions of the drilling process of a given geological formation.
The peculiarities of applying the therapeutic layer on the surface of the core pipe are
investigated in work. The experience shows that using electric arc surfacing under the flux layer is
expedient. This provides the necessary adhesion of the applied layer and promotes obtaining
resistance to the operation surface of the core pipe. At the same time, there is high-quality protection
and the possibility of additional alloying through the flux-slaggy welding bath.
Using electrode powder type wires creates conditions for flexibility to achieve the established
characteristics of functional layers [4–6]. The filling flux, located in the cross-section of the
electrode wire, can be easily changed by chemical composition. At the same time, it is possible to
make relatively small parties of a wire with the set characteristics.
The technological scheme justification about the core pipe surfacing is performed. It provides
the previous displacement of the electrode butt size from the zenith of the core pipe to prevent the
welding bath from spreading. The structural pipe size , the requirements for residual deformations,
and the conditions of shapping the welded layer show the practicality of welding on a helix.
Description
Keywords
core pipe, geological and engineering prospecting, electric arc surfacing, running welding energy, electrode flux-cored wires, wear-resistant coatings, thermal impact zone, heating for surfacing, hardening structures, welding bath
Citation
Dzyubyk A. Strengthening and reconstruction of drilling core pipe for engineering and geological exploration / Andrij Dzyubyk, Liudmyla Dzyubyk, Bohdan Shpak // Ukrainian Journal of Mechanical Engineering and Materials Science. — Lviv : Lviv Politechnic Publishing House, 2022. — Vol 8. — No 2. — P. 51–58.