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以超短半径为代表的径向水平井微小井眼技术已在国内外获得了广泛应用,但由于此类微型水平井筒采用壁面粗糙的裸眼完井方式,相比于常规水平井筒流动,粗糙壁微型水平井筒会产生几个数量级差别的压降,极大地影响着油气井的生产动态和流入动态。因此,进行粗糙壁微型水平井气液两相流动机理的基础研究,有着重要的科学意义和现实价值。第一,建立粗糙壁微型水平井筒单相流和气液两相流物理模拟实验平台,创造一种新的粗糙壁微型水平井筒模拟方式。第二,进行粗糙壁微型水平井筒单相流和气液两相流物理模拟实验,研究不同的实验条件对于井筒两端压降变化和气液两相流流型转化的影响。第三,建立粗糙壁微型水平井筒气液两相流的压降计算数学模型,拟合粗糙壁微型水平井筒摩阻系数计算公式,利用粗糙壁微型水平井筒气液两相流实验结果,验证拟合的摩阻系数计算公式的准确性。本论文建立的粗糙壁微型水平井筒气液两相流压降计算模型以及拟合的摩阻系数计算公式,对粗糙壁微型水平井筒流动的研究具有重要意义。
Radial horizontal well micro-borehole technology represented by ultrashort radius has been widely used both at home and abroad. However, due to the open-hole completion method with coarse wall surface, compared with the conventional horizontal wellbore flow, the rough wall Micro-horizontal wellbores can have several orders of magnitude of pressure drop, which greatly affects the production and inflow dynamics of oil and gas wells. Therefore, the basic research on the mechanism of gas-liquid two-phase flow in rough wall micro horizontal wells has important scientific significance and practical value. First, the establishment of rough wall micro-horizontal wellbore single-phase flow and gas-liquid two-phase flow physical simulation experimental platform to create a new rough wall micro-horizontal wellbore simulation. Secondly, the physical simulation experiments of single-phase flow and gas-liquid two-phase flow in rough wall micro horizontal wellbore are carried out to study the influence of different experimental conditions on the pressure drop across wellbore and the gas-liquid two-phase flow pattern conversion. Thirdly, the mathematic model of pressure drop calculation of gas-liquid two-phase flow in rough-wall micro horizontal wellbore is established, and the formula of the frictional coefficient of the micro-horizontal wellbore in rough wall is fitted. Based on the experimental results of the gas-liquid two- The accuracy of the friction coefficient calculation formula. The calculation model of pressure drop of gas-liquid two-phase flow in rough-wall micro horizontal wellbore and the formula of friction coefficient fitting are established in this paper, which is of great significance for the study of flow in rough-wall micro horizontal wellbore.