天然气喷射压力计算方法与应用分析

天然气喷射引流技术是利用高压气井的能量提高低压气井压力,实现低压气井正常稳定生产,延迟增压开采时间。目前在现场得到了一定应用,但存在喷射压力的理论与应用分析缺乏。为提高喷射引流技术的应用效果,优化设计喷射器参数,本文结合长庆气田某输气站气体喷射器的实际工作情况,以喷射器内部气体流动特征和气体动力学理论为基础,建立了混合压力及特性曲线的计算模型,并进一步分析了其影响因素。结果表明：混合压力随高、低压天然气压力的增加而增加;高、低压气的温度对混合压力的影响不明显;混合压力随喷射器结构参数混合腔喉部面积与一次气喷嘴喉部面积之比的增加而减小,结合可达到喷射系数计算曲线可确定出气体喷射器的最佳状态参数;结构参数一次气喷嘴出口面积与一次气喷嘴喉部面积之比对混合压力有较为复杂的影响,且该参数存在最优范围。分析结果对于喷射引流技术的应用推广具有指导意义。

The Calculation of Gas Ejection Pressure and Application Analysis

Gas ejection drainage technology is the use of the energy of high-pressure gas well to increase the pressure of low-pressure gas well,to achieve a normal and stable production in low-pressure gas well,to delay the time of supercharging production.Currently this technology has been to a certain application at the scene,however,it is a lack of ejection pressure theory and application analysis.To improve the effect of ejection drainage technology,optimize the ejector parameters,in this paper,using the actual work of a gas station in Changqing gas field,establishing mixed pressure and the characteristic curve calculation model based on the gas flow characteristics in internal ejector and gas dynamics theory,and further analysis the affecting factors.The results show that mixed pressure will be increased with high and low gas pressure;the effect of temperature of high and low pressure on the mixedpressure is no significant;mixed pressure will decrease with the ratio of ejector structural parameters of the mixing throat area and a gas ejection throat area increasing,combined with the can be achieved ejection coefficient curve cand etermine the best gas ejector parameters;the ratio of structural parameters of a gas ejection discharging area and a gas ejection throat area have a more complex effects on mixed pressure,and there exists an optimal range of this parameter.The results have guiding significance for the application and promotion of ejection drainage technology.