连续气举条件下举液管柱传热系数的确定

气举管柱温度分布对气举井设计和运行有着重要的意义,而传热系数是影响系统传热 和温度分布的重要参数,要准确地预测管柱内流体的温度梯度必须首先确定传热系数。针对气举 井实际工况,首次推导出气举管柱的传热系数计算公式,从而为气举管柱流温计算奠定了基础。 计算结果表明,注气点以上和注气点以下传热系数相差很大,所以在实际工程计算时必须分别予 以考虑,并且在计算中可以忽略油管和套管传热系数对气举管柱总传热系数的影响。

Determination of heat transfer coefficient of flow string during continuous gas lift

The temperature distribution of the gas-lift string is of great importance to the design and operation of the gas-lift recovery wells.Since the heat transfer coefficient is the key index influencing the system’s heat transfer and temperature distribution,it must be determined first in order to predict precisely gas lift flowing gradient.According to the actual working condition of the gas-lift recovery well,the formula for calculating the heat transfer coefficient of gas-lift string is derived for the first time.The result of calculation shows that,there exists great difference between the heat transfer coefficients above and below the gas injection point,therefore they should be considered respectively in actual engineering calculation,and the effect of the heat transfer coefficients of both the tubing string and the casing string on the total heat transfercoefficient canbeneglected in the calculation.