泥浆脉冲发生器活塞压力平衡装置的研究与优化设计

Research and Optimal Design on Piston Pressure-balance Device of Mud Pulse Generator

通过分析泥浆脉冲发生器活塞往复运动密封机理,综合考虑直径、行程和性价比,压力平衡装置选用O型密封圈作为往复运动密封;设计了活塞与活塞缸之间、活塞杆与活塞之间的密封结构。通过建立压力平衡装置的静态与动态力学模型,分析影响活塞移动的因素和井下工作的运动规律,为压力平衡结构设计提供理论指导。在分析现有压力平衡装置的不足之处的基础上,设计了活塞压力平衡装置,在泥浆脉冲发生器的内部密封环境里,活塞在活塞缸内运动平衡钻井液与脉冲发生器之间的压力;活塞杆与阀套控制泥浆的通断,平衡活塞内外之间的压差,使脉冲发生器能够工作在高温、高压等复杂工况的环境中,提高了脉冲发生器抗高温、抗高压的能力。

The reciprocating sealing mechanism is analyzed .The diameter ,stroke and price are considered .O‐ring sealing ring of the pressure balance device is selected for the reciprocating sealing .The sealing structure between piston and the piston cylinder ,between the piston rod and piston are designed .By establishing the static and dynamic mechanical model of the pressure balance device ,the factors that influence the movement of the piston and movement rule of the well are analyzed ,which provides the theoretical guidance for the design of the pressure balance structure .Finally ,based on the analysis of deficiencies of the existing pressure balance device , designed is the piston pressure balance device , in the mud pulse generator inside a sealed environment the piston cylinder balances drilling fluid and pulse generator between the pressures . Pressure of drilling fluid and pulse generator is balanced by movement of the piston in the sealed environment .The piston rod and the valve are used to control the on‐off of the mud and balance pressure between the internal and external piston ,the pulse generator is capable of working at high temperature , high pressure and other complex conditions of the environment , w hich improves the ability of the pulse generator high temperature resistant and anti pressure ability .