【摘要】 阐述了单相流（层流和紊流）、气、液两相流及油、气、水三相流时水平开水手段压降的几种计算方法。用一个实例计算了水平段单相紊流时的压降，结果可知，在长的水平井中，水平段出现紊流时不能忽略压降。当水平段出现多相流时会有显著压降。更多还原

【Abstract】 This paper introduces some method for calculating pressure drop in the horizontal section of horizontal well, including single wphase flow(laminar and turbulent flow),gas - liquid two phase flow and oil -gas -water three phase flow. An example ls used to demonstrate the calculation of pressure drop in case of the single -phase turbulent flow. The results show that the pressure can not be ignored in turbulent flow. There are larger pressure drop in multiphase flow.更多还原