失控着火井天然气喷流燃烧火体力学行为研究

量化井喷失控井喷流、燃烧火体及其响应域速度、压力、温度场分布规律对失控着火处理方案分析、处理设计及处理作业都具有重大意义。文章分析了失控井天然气喷流录相，并根据自由紊动扩散射流理论分析了失控着火天然气喷流及燃烧火体的力学行为。结果认为：喷流速度大于火焰燃烧速度段为轴对称（圆形）自由紊动射流，燃烧火体段是由于紊动射流的脉动而卷入环境空气与喷流（燃料）混合燃烧的；当未着火段接近井口时可被视为紊动扩散燃烧火焰，而当未着火段远离井口时则可被视为紊流部分预混燃烧火焰。在建立了失控井天然气喷流及燃烧火体物理模型后，可进而建立相应的数学模型以定量描述喷流、燃烧火体及其响应域的动力学参数。

STUDY ON MECHANICS OF GAS JET FLOW AND BURNING BODY FOR LOSS-CONTROLLED WELLS

It is very important for loss-controlled wells to quantify the jet flow and burning body flow and the distribution law of velocity, pressure and temperature fields in its response domain for the plan analysis, the processing design and the processing operation of fire fighting. The tape record of gas jet flow for loss-controlled wells is analyzed. With the jet flow theory of free turbulent motion diffusion, the gas jet flow and the burning body of loss-controlled wells are analyzed. The results show there is free turbulent motion jet flow with axial symmetry (circle) in the section where the velocity of jet flow is bigger than the velocity of combustion. The burning section is made from the air that is involved by the pulse of turbulent motion jet flow mixing with the jet flow (fuel) to burn; The non-burning section when it is near the wellhead can be regarded as the burning flame of turbulent motion diffusion, and the non-burning section when it is far from the wellhead can be regarded as the pre-mixed burning flame of turbulent section. After the physical model of gas jet flow and burning body is established for loss-controlled wells, the corresponding mathematical model can be developed to quantitatively describe the jet flow and burning body and the mechanics parameters of the response domain.