现场应用表明，举升液体粘度、泵径是影响无油管采油系统举升能力的关键因素。

The field application indicated that the lifting liquid viscosity, pumps the diameter are key factor influencing lifting capacity of oil extraction system of non-tubing.

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从理论上分析导出了极限泵径和极限沉没度，并引用小泵深抽技术采用试算法确定了合理的沉没度和泵挂深度。

Limit pump diameter and percentage of submergence are derived theoretically. Trial and error method is used to calculate the rational percentage of submergence and pump setting depth.

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在这种状况下，必须降低泵的转速，加大电机的功率，加大进出口的管径来减少介质的流动阻力。

Under this situation, we must reduce the speed of pump, increase the power of the motor, increase the import and export of pipe diameter to reduce the flow resistance of the medium.

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