Study on Flame Suction Behavior of High-Pressure Gas Well under Self-Excited Negative Pressure Effect

Abstract

Summary Placing a flow tube on the wellhead to suction flame during a well control operation is key to creating a safe environment near the wellhead. Aiming at the problem that the internal flame of the flow tube can easily leak during the rescue of a high-pressure gas well, we propose in this paper to use the self-excited negative pressure effect to improve the capacity to suction flame. Based on the coupling method of the Reynolds averaged Navier-Stokes equation and mixed combustion model, a gas well combustion model is established. The accuracy of the model is verified by proportional scaling experiment. Furthermore, the sensitivity analysis of key structural parameters of self-excited negative pressure flow tube is carried out, and the structure of the flow tube optimized. The result shows that the optimized flow tube has a suction flow about twice that of the horn flow tube, and the suction scope is increased by 61.5%, which greatly improves the flame suction capacity. The research work can provide guidance for structural design and optimization under self-excited negative pressure effect.