主动密封旋转防喷器胶心油压响应规律研究

Hydraulic Response Rule of Rubber Element of Active Sealing Rotating Control Device

确定主动密封旋转防喷器胶心的油压响应对整个装备的研制至关重要。运用有限元软件建立了胶心模型,在内胶心上、下两端全约束的情况下计算胶心的Von Mises应力分布,对胶心内置铁块的数量、形状及安放位置进行计算和设计,得到了注油压力与最大接触压力的估算式,通过样机的密封压力试验对估算式进行验证。研究结果表明,主动密封胶心完全采用橡胶材料其刚度无法满足设计要求;主动密封胶心需要内置8块铁块,铁块外弧10°,内弧13°,径向长度确定为105 mm,轴向高度为90 mm;胶心与钻杆的接触压力比施加在胶心上的油压小5 MPa。

Considering that determining the hydraulic pressure response of the rubber element of the active sealing rotating control device is essential for the development of the equipment. The rubber element model is estab- lished using finite element software. Based on the established model, the Yon Mises stress distribution on the rubber element is calculated with full constrain on upper and lower ends of the rubber element. Meanwhile, the number, shape and placement position of the built-in iron block are calculated and designed. The estimation formula of oil in- jection pressure and maximum contact pressure is proposed and validated by sealing pressure test of the proto- type. The results show that the stiffness of the active sealing rubber element only made of rubber could not meet the requirement of design. Eight built-in iron blocks are needed for the active sealing rubber element with the outer arc of 10°, inner arc of 13°, radial length of 105 mm and axial height of 90 ram. The contact pressure between the rub- ber element and drill pipe are 5 MPa smaller than the hydraulic pressure on the rubber element.