Optimization Design of Valve Disc for Concentric Drive Hydro-Oscillator
The excessive deviation angle of extended reach wells and horizontal wells would create significant friction between the drill string and the sidewall,leading to a decrease in drilling speed.The use of hydro-oscilla-tor is one of the effective methods to solve the above problem.In this paper,a concentric drive hydro-oscillator was designed,and simulation analysis was conducted on the erosion situation of its valve disc system.The simula-tion analysis results show that the interface between the dynamic and static valve discs is subjected to erosion wear of drilling fluid.Especially when the relative turning angle of the dynamic and static valve discs is 25°,the erosion wear is the most severe.Structural optimization and simulation tests were conducted on the dynamic and static valve discs.The simulation results show that when the chamfer of both the dynamic and static valve discs is 20°,the maximum erosion rate is the smallest,and the optimization effect is the best.Field test was conduct on the opti-mized concentric drive hydro-oscillator.The test results show that the concentric drive hydro-oscillator significantly improves drilling efficiency.Compared with conventional hydro-oscillator,the concentric drive hydro-oscillator helps improve the average rate of penetration by 33.62%and extend the average service life of the tool by 27.46%under the same conditions.The conclusions provide reference for the design and optimization of hydro-oscillators.
hydro-oscillatordynamic and static valve discserosionchamfernumerical simulationop-timization analysis
万方数据
维普
