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建立了带井下液力推进器钻具组合的数学模型，并进行了振动分析和模型求解。给出了确定井下液力推进器以下钻具临界长度的两种方法。根据数学模型并针对现场实际情况而设计的带井下液力推进器的钻具组合能将钻柱振动分隔成两部分，一方面减轻液力推进器以上钻柱的振动，又充分利用液力推进器以下的钻具振动对钻头施加一冲击能量，使钻头平均机械钻速提高４１３％；另一方面，跳钻得到一定控制，钻头牙爪和牙齿磨损减轻，钻头平均使用寿命提高１２１％，平均机械进尺提高５５４７％，没有断齿现象。
The mathematic model of the drill assembly with downhole hydraulic thruster is established, and the vibration analysis and model solving are carried out. Two methods of determining the critical length of a drill below the hydraulic thruster are given. According to the mathematical model and according to the actual situation in the field designed downhole hydraulic thrusters can drill string vibration can be separated into two parts, on the one hand to reduce the hydraulic propulsion drill string above the vibration, and make full use of hydraulic propulsion On the other hand, the control of the jump drill is controlled, the wear of the tooth claw and the tooth of the drill bit is reduced, and the average service life of the drill bit is increased by 12%. 1%, the average mechanical footage increased 55 47%, no broken teeth phenomenon.