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从油管管鞋到油层中部之间有数百至上千米的“积水口袋”其压力梯度计算,要考虑油、气、水三相之间的滑脱情况,否则会带来明显的误差。本文提出一种计算方法,在油、气、水三相流动中,首先考虑油、水之间的滑脱情况,然后油水并为液相,再考虑气、液两相间的滑脱本文附有20井次的实测资料与计算结果的比较。对比表明:压力差相对误差的均值为-0.64%.根方差为7.52% 这种方法是可行的,还可尝试用于油、气、水三相的油管垂直流动计算,计算精度可满足现场要
The calculation of the pressure gradient of the “water-filled pockets” from the tubing shoes to the middle of the oil layer should take into account the slippage between the three phases of oil, gas and water, otherwise obvious errors will be caused. In this paper, a calculation method is proposed. In the three-phase flow of oil, gas and water, the slippage between oil and water is first considered, then the oil and water are in the liquid phase, and then the slip between gas and liquid phases is considered. Times the measured data and the results of the comparison. The comparison shows that the mean value of the relative error of the pressure difference is -0.64% and the root variance is 7.52%. This method is feasible and can also be used to calculate the vertical flow of tubing in oil, gas and water phases.