Analytical estimation of inertial properties of the curved rotating section in a drill string
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2019, Vol 1, Issue 7
Abstract
<p>We have proposed approaches to analytical assessment of the moment of inertia related to the curved rotary sections in a drill string. Research into rotation processes of the curvilinear sections in a drill string is associated at present with a particular difficulty, which arose because of the lack of precise expressions to evaluate the moments of inertia for a curved pipe based on the parameters of its deformation. Solution to such problems is important for the analysis of dynamic resistance of drill strings at rotor and rotor-turbine drilling techniques, when studying the stressed-strained state of its elements, refining the energy costs for rotation process of the curved sections in a well, as well as for analysis of critical rotation speeds. We have investigated the moment of inertia for a bent section in the rotating drill string using the models with concentrated and distributed masses. Based on the results, we have established the exact and asymptotic analytical dependences in order to determine inertial characteristics of the curvilinear sections in a drill string, as well as provided recommendations regarding the application of these dependences.</p>A current trend in the development and modernization of drilling equipment is the use of drill pipes made of unconventional materials. Given the scientific and practical interest in the application of these materials, we calculated the moments of inertia for the curved sections of drill strings, which can be equipped with steel, aluminum, titanium, or glass-plastic drill pipes. Analytical estimation of the moment of inertia of curved sections refers to a different scale of the deformed state of a drill string. The formula for the moment of inertia, established for simple models, holds in cases when the curved section of a drill string executes large displacements. For the case of small displacements, it is necessary to apply the analytical result derived when using a model with distributed parameters. The established patterns are essential for analyzing the dynamics of a drill string in deep conditionally vertical, inclined-directional, or horizontal wells with a complex mining-geological profile
Authors and Affiliations
Jaroslav Grydzhuk, Igor Chudyk, Andriy Velychkovych
Keywords
Related Articles
- EP ID EP666202
- DOI 10.15587/1729-4061.2019.154827
- Views 71
- Downloads 0
Determination of parameters of the stochastic inventory management system in the conditions of economically-based shortage
<p>A methodical approach to determining the optimal parameters of a stochastic inventory management system in the context of an economically justified deficit that allows responding quickly to fluctuations in demand and...
Prediction of chatter stability in turning
A new technology for predicting chatter in turning, based on simulation of the cutting process in time and frequency domains using the Nyquist diagram has been developed. The cutting process is presented as carried out i...
Identification of the state of an object under conditions of fuzzy input data
The modernization of the methods for identification of the state of objects under conditions of fuzzy input data, described by their membership functions, was performed. The selected direction of improvement of tradition...
Studying the effect of sesame flour on the technological properties of dough and bread quality
<p class="a">It has been proven that the sesame seed chemical composition when compared with wheat flour is distinguished by the larger content of mono- and polyunsaturated fatty acids, mineral substances, protein, valua...
Weakening of rock strength under the action of cyclic dynamic loads
We report results of experiment on the estimation of decreasing strength of natural stone exposed to repeated dynamic loading. The study was conducted in order to assess the feasibility of using natural stone for the acc...