Abstract
This paper focuses on the improved design of Tc bearing’s structure form. A sand transmission groove is designed around the outer ring of Tc bearing to make it easy to remove solid particles, and the dynamic pressure Reynolds equation of Tc bearing is solved and the static characteristics of two structures of Tc bearing are compared and analyzed. Overall, conclusions are drawn: the carrying capacity of Tc bearing with the sand transmission groove is less than that of the original Tc bearing; the end discharging capacity of Tc bearing with the sand transmission groove is more than that of the original Tc bearing, which is in favor of the removal of solid particles from the Tc bearing and the enhancement of sand removal function; improving the dynamic characteristics of the liquid film of Tc bearing, Tc bearing with the sand transmission groove is suitable for the rotor system with high-speed light-load of MWD.
Highlights
Tc bearing is a sliding bearing for down-hole hostile environment, which has been successfully applied in positive displacement motor and turbodrill, In some down-hole tools with rotary dynamic seal modes, such as high-speed light-load rotor system composed of continuous wave pulse generator, etc. for measurement while drilling, magnetic coupling is combined with Tc bearing to replace traditional dynamic seal in order to overcome the disadvantage of extremely short service life of the rubber parts among dynamic seal components in the hostile environment
If it is not flushed by the fluid squeezed from two ends of the bearing due to the high pressure in the convergent wedge, when solid particle passes through the part with the minimum liquid film thickness, and the load is higher than the designed limit, solid particle cannot pass through the gap between the inner ring and the outer ring, bearing inner ring is pushed out of the outer ring by solid particles as a result, the eccentricity ratio is reduced, the bearing carrying capacity is reduced, thereby resulting in bit bouncing accident
Compared with primary structure Tc bearing, the sand transmission belt type has the following features: 1) The originally integral convergent wedge is divided into several parts by grooving
Summary
Tc bearing is a sliding bearing for down-hole hostile environment, which has been successfully applied in positive displacement motor and turbodrill, In some down-hole tools with rotary dynamic seal modes, such as high-speed light-load rotor system composed of continuous wave pulse generator, etc. for measurement while drilling, magnetic coupling is combined with Tc bearing to replace traditional dynamic seal in order to overcome the disadvantage of extremely short service life of the rubber parts among dynamic seal components in the hostile environment. Tc bearing is a sliding bearing for down-hole hostile environment, which has been successfully applied in positive displacement motor and turbodrill, In some down-hole tools with rotary dynamic seal modes, such as high-speed light-load rotor system composed of continuous wave pulse generator, etc. For measurement while drilling, magnetic coupling is combined with Tc bearing to replace traditional dynamic seal in order to overcome the disadvantage of extremely short service life of the rubber parts among dynamic seal components in the hostile environment. Cause very serious vibration and impact, stability of the rotor system with Tc bearing is higher. Fluid dynamic pressure lubrication theory is regarded as the foundation for analyzing Tc bearing working principle, thereby improving its surface structure, enhancing its sand removal function and heightening stability of the rotor system
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