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针对降落中的虹吸测斜 仪与钻具内壁所形成的仪 器环 空的特 点，应用 粘性流 体层 流的运 动规律， 建立了 仪器环空内流体运动的微分方程，推导 出了速度分布、速度梯度、流量、平 均流速、压差及雷 诺数的精 确表达式 ，并通过 受力分析 获得了仪器自由降落速度的层流解 析解． 同时 ，定义了仪器环空断 面阻降系 数，制作 了相应的 表格，系 数值越大 ，仪器环空断面面积越小，仪器环空阻降 力越强，在同一种钻井液中的降速 越慢． 应用示例表明：当 Ｒｅ ＜ ２ １００ 时 ，仪器环空内流体流动为层流．
Aiming at the characteristics of instrument siphon formed by the siphon instrument and the inner wall of the drilling tool, the differential equations of the fluid motion in the annulus of the instrument are established by applying the motion law of the laminar flow of viscous fluid. The velocity distribution, velocity gradient , Flow rate, average flow rate, pressure drop and Reynolds number, and obtained the laminar flow analytical solution of the free falling speed of the instrument through the force analysis. At the same time, the instrument defines the drop-off coefficient of annulus cross-section, and produces the corresponding table. The larger the coefficient value is, the smaller the cross-sectional area of the annulus is and the stronger the annulus descending force of the instrument is. SLOW. Application examples show that when Re <2 100, the fluid flow in the instrument annulus is laminar.