Field Performance of a Hydrodynamically Lubricated Bearing Seal for Rock Bits

Abstract

This paper presents field performance results for a new type of bearing seal for rock bits. The new seal design is found to be effective in significantly reducing abrasive wear at the sealing interface by virtue of its unique geometry that simultaneously introduces a hydrodynamic lubricant film and prevents the ingress of abrasives at the sealing interface. This has resulted in longer seal life and overall improvements in the rock-bit performances by a significant reduction in early seal failures.

Evaluation of sealing performance of bearing rings of roller-cone bits based on grid-shaped bionic non-smooth surface

“…In the early 1990s, MS Kalsi, a US expert in sealing, and the security company jointly launched a hydrodynamic seal bearing bits, opening up a new chapter of the development of radial sealing technology. 4 In 2003, Professor Qiming Yang et al from Southwest Petroleum University put forward a saucer-shaped sealing ring from the structural design of reducing the contact pressure. The new designed sealing ring is featured by high sealing performance, stability, and strong resistance against friction and wear.…”

The Modeling of Rubber Sealing Ring of Fluid Dynamic Pressure and Finite Element Analysis about Stress Based on SolidWorks and ANSYS

“…Based on the theory of hydrodynamic lubrication, Kalsi Engineering, Inc from the United States designed sealing in the hydrodynamic pressure with unique geometrical shape, and has successfully made the series of products. Kalsi seals have been successfully applied to seal of bearing system of roller bit, the faucet of drilling fluid and the bop in high pressure rotating at present [2][3][4] . Compared to the status of study abroad, the study of sealing in fluid dynamic pressure is still in the initial stage in domestic.…”