This paper presents a theoretical model for realistic annular pressure loss calculation in which the eccentricity is a function of the well depth and a simplified method for field calculations.
本文介绍偏心度为井深函数的实际环空中压降计算的理论模型和便于现场使用的简化计算方法。
Therefore, a downhole tool that can reduce the annular cyclic pressure loss and introduced its structure, principle of work and technical parameters were put forward.
提出了一种减小钻井泥浆环空循环压耗的井下工具，介绍了该工具的结构、工作原理、技术参数。
At the end of the annular passage, shock wave occurs when the relative lift is less than 6% and the pressure ratio is less than 0.7, which causes a greater total pressure loss.
在相对升程小于6%、压比小于0.7后，环形通道的末端将产生激波，激波带来较大的全压损失。
Downhole annular pressure is a key parameter. Conventional pressure loss calculation method is not applicable to a slin - hole.
井底环空压力是小井眼钻井的关键参数，通常的压力降计算方法对小井眼不适用。
With low pressure loss and simple repair, the annular-type centrifugal flowmeter, being without rotary element installed in it, can not be stuck and block up.
作为新产品的环式离心流量计因结构内部无转动部件，故不易卡、堵，压力损失小，维修工作量少。
With low pressure loss and simple repair, the annular-type centrifugal flowmeter, being without rotary element installed in it, can not be stuck and block up.
作为新产品的环式离心流量计因结构内部无转动部件，故不易卡、堵，压力损失小，维修工作量少。
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