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Most turbine designs are based on the continuous rotating turbine structure. In this paper, a novel hydraulic balanced turbine (HBT) with a symmetrical blade structure that can be used in a hydro-environment is proposed. The turbine, which uses the hydraulic impact of the nozzle jet and balanced turbine blade design in stability control, could be used to control stability in certain applications, e.g. in drilling engineering. This is a completely new way of thinking about turbine design. Because of the special blade design of the HBT, when the nozzle deviates from the balance position, the HBT will be restored to the balance position under the action of external moment. The follow-up performance of the HBT is directly related to the rotational speed of the nozzle. The theoretical and numerical solutions in this paper have good consistency. Modern computational resources allow computational fluid dynamics to be an integral part of turbine design. The simulation results proved that this innovative design is feasible and has potential application prospects. The HBT realizes the ‘soft’ connection between the controlled stable platform and the actuator in the vertical drilling tool, which can significantly improve the control precision of mechanical vertical drilling.

Most turbine designs are based on the continuous rotating turbine structure. In this paper, a novel hydraulic balanced turbine (HBT) with a symmetrical blade structure that can be used in a hydro-environment is proposed. The turbine, which uses the hydraulic impact of the nozzle jet and balanced turbine blade design in stability control, could be used to control stability in certain applications, e.g. in drilling engineering. This is a completely new way of thinking about turbine design. Because of the special blade design of the HBT, when the nozzle deviates from the balance position, the HBT will be restored to the balance position under the action of external moment. The follow-up performance of the HBT is directly related to the rotational speed of the nozzle. The theoretical and numerical solutions in this paper have good consistency. Modern computational resources allow computational fluid dynamics to be an integral part of turbine design. The simulation results proved that this innovative design is feasible and has potential application prospects. The HBT realizes the 'soft' connection between the controlled stable platform and the actuator in the vertical drilling tool, which can significantly improve the control precision of mechanical vertical drilling. [ABSTRACT FROM AUTHOR]

The automatic vertical drilling system (VDS) adopts downhole closed-loop control, through ground monitoring, a large closed-loop control on the ground and downhole is formed to keep the wellbore in a vertical position. The Mechanical Automatic Vertical Drilling System (MVDS) which working in full mechanical mode has been more economical, safety and reliability. We proposed and developed a novel MVDS with high control accuracy in this paper. A new type of Hydraulic Balance Turbine (HBT) is presented and applied to MVDS, used to drive the upper disc valve to reduce the frictional resistance and the influence of the bottom drilling tool vibration. This can achieve a “soft” connection between eccentric platform and the upper valves, eliminate the effect of the friction between the upper valve and the lower valve, and optimize the control ability. After HBT optimization, the stable angle is closer to the low side, which can make the control of MVDS more accurate. The same conclusion was verified by laboratory tests as well.