Публикации

D. Pogorelov, G. Mikheev, K. Valiullin, R. Gandikota. Use of multibody system approach for torque and drag analysis of long drill strings.

11th World Congr. on Computat. Mech., July 20-25, 2014, Barcelona, Spain, pp. 688-699.

Abstract.

The paper focuses on application of multibody system approach for the torque and drag analysis of long drill strings. The approach is used to get improved results as compared with those obtained by soft-string models. The analysis is carried out by integration of equations of motion of the drill strings till reaching equilibrium under externally applied loads corresponding to conditions of drilling operations. A small value of kinetic energy serves as a criterion for finishing the simulation. To increase the convergence, high damping is applied to the drill string. Such damping is absent in the real well bores. It leads to speedy fall of the kinetic energy in a few seconds after start of the integration. However, low frequency oscillations with very small value of the energy appear if length of the drill string is several kilometers. As the result, the equilibrium position is reached very slowly. In order to overcome this effect, the three-step algorithm is proposed. It is based on the solution of static equations of the drill string for calculation of initial conditions that is used for dynamic simulation. Using the algorithm, torque and drag analysis of the drill string up to ten kilometers in length takes several minutes on modern computers. Some simulation aspects, such as efficiency of parallel computations are also considered in the paper.

 
 
 

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