«Onshore and offshore oil and gas well construction»

Study of a pneumatic cyclone abrasive wear based on simulation modeling in the "ANSYS Fluent" environment

UDC: 622.23.05
DOI: -

Authors:

¹ Siberian Federal University, Krasnoyarsk, Russia

Keywords: rotary impact drilling, cyclone, erosion, abrasive wear, anti-erosion element, ANSYS Fluent, erosion modeling

Annotation:

The rotary percussion drilling method using downhole pneumatic percussion machines is one of the most productive methods known by nowadays, that allow maintaining a high mechanical drilling speed in case of tools moderate wear. The method is becoming increasingly popular in geological exploration, especially abroad. One of the areas of the innovations application in case of using the pneumatic percussion drilling method is pneumatic cyclones design of RC drilling rigs. Drilling experience has shown that in the place of the cyclone body cylindrical part, facing at a right angle to the direct flow of air and sludge particles, there appeared intense abrasive wear, leading to premature failure of the standard armor element and formation of holes in the cyclone, which entails additional unproductive labor and time costs. Analytical determination of the abrasive wear value is complicated by the lack of a comprehensive understanding of the process of the material deformation and destruction under the influence of particles diffusion flow. The known analytical erosion models are developed based on experimental data and empirical formulas with certain boundary conditions and are not universal. As part of the study, based on a certain area of maximum erosion, a design of an inspection window of a pneumatic cyclone with a removable armor plate was developed, allowing for quick access to it for inspection and replacement without dismantling and the cyclone disassembling. In the ANSYS Fluent software package, computer modeling of erosive wear of a standard pneumatic cyclone design and a developed design with a removable armor plate lined with Densit material was carried out. The efficiency of the proposed technical solutions is confirmed by a 36 % decrease of the erosion rate with a corresponding increase of the service life and a decrease of the frequency of scheduled maintenance of the pneumatic cyclone, a significant reduction of time spent on replacing the anti-erosion element.

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