| 摘要 |
A drill bit ( 100 ) for drilling a wellbore that traverses subterranean formations includes a drill bit body ( 106 ) having a plurality of journal pins ( 112 ), each having a bearing surface ( 128 ), and a rotary cutter ( 104 ) rotatably mounted on each journal pin ( 112 ), each rotary cutter ( 104 ) including a bearing surface ( 126 ). A pressure-compensated reservoir ( 130 ) is in fluid communication with the bearing surfaces ( 126, 128 ) and has a lubricant therein. A seal element ( 144 ) is positioned between each journal pin ( 112 ) and rotary cutter ( 104 ) and retains the lubricant in the bearing surfaces ( 126, 128 ). The seal element ( 144 ) is formed from a nanocomposite material including a polymer host material and a plurality of nanostructures.
|
