Theory of Magnetic Fluid Sealing in Roller Cone Bits

Most of the untapped oil and gas resources in China are buried in deep formations, and drilling technology plays a crucial role in the exploration and development of oil and gas resources in China. Roller bit plays an irreplaceable role in oil and gas drilling, especially for the harsh drilling conditions and formation conditions in deep wells. However, the current situation of low penetration rate, low life, low drilling efficiency, and high cost of cone bits is particularly prominent, and sealing failure is the key factor. Currently, there are mainly two types of sealing for cone bits: radial sealing and metal sealing. Although the existing sealing research results are relatively significant, contact sealing cannot fundamentally solve the wear problem, and thus cannot improve the rotational speed and drilling efficiency. Therefore, this paper presents a magnetic fluid seal structure designed for roller cone bits and provides a theoretical study of it.