Optimization of Fuel Injection Process and Structural Analysis

In order to solve the problem of precise and controllable ignition fuel injection point in the process of UCG, this paper proposes a process method of presetting the ignition agent. The method achieves the purpose of improving the ignition success rate by increasing the downhole ambient temperature and reducing the ignition threshold. By simulating and analyzing the fluid properties of the fuel in the pipeline, the velocity and dynamic pressure at the outlet of the pipeline under different initial velocities are obtained. The results show that the outlet velocity, dynamic pressure and initial velocity have an irregular curvature relationship. As the initial velocity increases, the outlet velocity and dynamic pressure continue to increase. After calculation, the relationship between the exit speed (Y) and the initial speed (X) is Y=-0.5069X2+2.0909X+5.0624. Therefore, long-distance injection is not conducive to the successful ignition of the fuel downhole.