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抽油机井深井泵的入口压力是一个重要资料。通过它不仅可以分析泵的工作状况,而且可以计算井底流压。泵的入口压力可以从油管和套管的环形空间(简称环空)下小直径压力计或随油管外壁下入电缆压力计实测。但这种方法,对于5 1/2 in套管里用3in油管下泵径为70mm以上泵的井很困难。最简单的办法是通过液面法和示功图法计算。然而当液面资料不准(如环空内有泡沫油等)时,用液面法计算的压力误差较大。用示功图法计算压力虽然较方便,但因受仪器精度和操作方法的影响,使得拉线法算出的液体
Suction pump deep well pump inlet pressure is an important data. It can not only analyze the working condition of the pump, but also calculate the bottom hole flow pressure. The inlet pressure of the pump can be measured from the small diameter manometer in the annular space of the oil pipe and the casing (referred to as annulus) or with the cable manometer under the outer wall of the oil pipe. However, this method is very difficult for wells with a pump diameter of 70 mm or more in 3 1/2 in. Tubing with 5 1/2 in. Casing. The easiest way is calculated by the liquid surface method and dynamometer method. However, when the liquid level information is not allowed (such as foam oil in the annulus, etc.), the liquid pressure method to calculate the pressure error. Although it is more convenient to calculate the pressure by the method of dynamometer, the accuracy of the instrument and the operation method make the fluid