A Hybrid Method for Solving the One-Dimensional Wave Equation of Tapered Sucker-Rod Strings

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Veröffentlicht in:Axioms vol. 13, no. 6 (2024), p. 414
1. Verfasser: Yin, Jiaojian
Weitere Verfasser: Ma, Hongzhang
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MDPI AG
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024 7 |a 10.3390/axioms13060414  |2 doi 
035 |a 3072271556 
045 2 |b d20240101  |b d20241231 
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100 1 |a Yin, Jiaojian 
245 1 |a A Hybrid Method for Solving the One-Dimensional Wave Equation of Tapered Sucker-Rod Strings 
260 |b MDPI AG  |c 2024 
513 |a Journal Article 
520 3 |a Simulating surface conditions by solving the wave equation of a sucker-rod string is the theoretical basis of a sucker-rod pumping system. To overcome the shortcomings of the conventional finite difference method and analytical solution, this work describes a novel hybrid method that combines the analytical solution with the finite difference method. In this method, an analytical solution of the tapered rod wave equation with a recursive matrix form based on the Fourier series is proposed, a unified pumping condition model is established, a modified finite difference method is given, a hybrid strategy is established, and a convergence calculation method is proposed. Based on two different types of oil wells, the analytical solutions are verified by comparing different methods. The hybrid method is verified by using the finite difference method simulated data and measured oil data. The pumping speed sensitivity and convergence of the hybrid method are studied. The results show that the proposed analytical solution has high accuracy, with a maximum relative error relative to that of the classical finite difference method of 0.062%. The proposed hybrid method has a high simulation accuracy, with a maximum relative area error relative to that of the finite difference method of 0.09% and a maximum relative area error relative to measured data of 1.89%. Even at higher pumping speeds, the hybrid method still has accuracy. The hybrid method in this paper is convergent. The introduction of the finite difference method allows the hybrid method to more easily converge. The novelty of this work is that it combines the advantages of the finite difference method and the analytical solution, and it provides a convergence calculation method to provide guidance for its application. The hybrid method presented in this paper provides an alternative scheme for predicting the behavior of sucker-rod pumping systems and a new approach for solving wave equations with complex boundary conditions. 
653 |a Accuracy 
653 |a Convergence 
653 |a Mathematical analysis 
653 |a Finite difference method 
653 |a Fourier series 
653 |a Boundary conditions 
653 |a Exact solutions 
653 |a Computer simulation 
653 |a Pumping 
653 |a Error analysis 
653 |a Wave equations 
653 |a Strings 
653 |a Energy consumption 
700 1 |a Ma, Hongzhang 
773 0 |t Axioms  |g vol. 13, no. 6 (2024), p. 414 
786 0 |d ProQuest  |t Engineering Database 
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