现有的密封轴承牙轮钻头大都采用“O”型橡胶密封圈。为应付井下恶劣的工作条件,特别是由钻井液所建立的井底高压,都配置了一个储油补偿系统。这个系统的任务就是保证轴承和密封圈能有良好的工作条件,从而延长它们的使用寿命。我们的现场调查资料表明,现有的牙轮钻头轴承的使用寿命,差不多是直接地取决于所用的密封圈的寿命。而密 Most of the existing sealed bearing roller cone bit “O” type rubber seal. In order to cope with the poor working conditions downhole, especially the bottom hole built by the drilling fluid high pressure, are equipped with an oil compensation system. The task of this system is to ensure that bearings and seals have good working conditions, thus extending their useful life. Our field survey data shows that the service life of existing roller cone bit bearings is almost directly dependent on the life of the seal used. And dense