携液气井生产测井资料解释方法初探

Approaching on Production Well-logging Data Interpretation Method of Liquid Carrying Gas Wells

当井筒内气流速度低于维持气井连续排液的临界气流速度时 ,气井出现携液现象。分析了携液气井中流体的流动状况及其性质的变化 ,指出这些变化在测井曲线上的表现特征为 :①流体密度测井曲线出现异常 ,井筒中流体密度的测量值在井筒下部近似为地层水的密度 ,在井筒上部近似为气体的密度 ,而在中间过渡段介于二者之间且一般自下而上逐渐减小 ;②流体含水测井曲线出现异常 ,曲线幅度变化与流体密度曲线正好相反 ;③涡轮流量曲线波动幅度较大 ,甚至出现不同测井速度下流量曲线交叉的现象。提出了依据测井曲线判断气井是否携液和携液气井生产测井资料的解释方法。实际应用表明 。

When gas flow velocity in a wellbore is less than a critical gas flow velocity maintaining continuous flowing back in a gas well, a liquid carrying phenomenon occurs in the gas well. Fluid flowing conditions and its property changes in the liquid carrying well are analyzed, the characteristics of the changes on the well logging curves are pointed out, which include: ① fluid density logging curve is abnormal, the measured value of wellbore fluid density is approached to that of formation water in lower wellbore, approached to gas density in upper wellbore and it falls between in the transition section and gradually reduces from bottom to upper; ② Fluid identification logging curve is abnormal, the curve amplitude change is inversed with the fluid density curve; ③ The fluctuating range of turbine flow curve is higher, even the flow curve crossover occurs under different logging velocities. Methods are proposed for judging if the gas well is liquid carrying based on the logging curve and interpreting production logging data in the liquid carrying gas well. The application indicates that the interpretation errors of logging data would be reduced at certain degree by using the new method.