Downhole drilling tool with a polycrystalline diamond bearing

A downhole tool, the downhole tool comprising:

• a stator component, the stator component comprising a stator, a transmission housing, and a bearing housing, wherein the transmission housing is coupled between the stator and the bearing housing;
• a rotor component, the rotor component comprising a rotor, a transmission, a drive shaft, and a drill bit, wherein the transmission is coupled between the rotor and the drive shaft, and wherein the drill bit is positioned on a distal end of the rotor component;
• wherein one of the stator and the rotor comprises a metal bearing surface, the metal bearing surface comprising a metal that contains at least 2 weight percent of a diamond solvent or diamond catalyst based on a total weight of the metal;
• a first bearing assembly interfacing engagement between the rotor and the stator, the first bearing assembly comprising a plurality of first polycrystalline diamond bearing elements each having a first diamond bearing surface, wherein the plurality of first polycrystalline diamond bearing elements are positioned relative to the stator and the rotor such that the first diamond bearing surfaces are engaged with the metal bearing surface;
• a second bearing assembly interfacing engagement between the rotor and the stator, the second bearing assembly comprising a plurality of second polycrystalline diamond bearing elements each having a second diamond bearing surface, wherein the plurality of second polycrystalline diamond bearing elements are positioned relative to the stator and the rotor such that the second diamond bearing surfaces are engaged with the metal bearing surface, and wherein the first bearing assembly is spaced apart from the second bearing assembly;
• and
• a sensor coupled with the stator component, wherein the sensor is in communication with a component and is configured to transmit sensor measurement data to the component.

A downhole tool, the downhole tool comprising:

• a stator component, the stator component comprising a stator, a transmission housing, and a bearing housing, wherein the transmission housing is coupled between the stator and the bearing housing;
• a rotor component, the rotor component comprising a rotor, a transmission, a drive shaft, and a drill bit, wherein the transmission is coupled between the rotor and the drive shaft, and wherein the drill bit positioned at a distal end of the rotor component;
• wherein one of the stator and the rotor comprises a metal bearing surface, the metal bearing surface comprising a metal that contains at least 2 weight percent of a diamond catalyst or diamond solvent based on a total weight of the metal;
• a first bearing interfacing engagement between the rotor and the stator, the first bearing comprising a first polycrystalline diamond bearing element having a first diamond bearing surface, wherein the first polycrystalline diamond bearing element is positioned relative to the stator and the rotor such that the first diamond bearing surface is engaged with the metal bearing surface;
• a second bearing interfacing engagement between the rotor and the stator, the second bearing comprising a second polycrystalline diamond bearing element having a second diamond bearing surface, wherein the second polycrystalline diamond bearing element is positioned relative to the stator and the rotor such that the second diamond bearing surface is engaged with the metal bearing surface, and wherein the first bearing is spaced apart from the second bearing;
• and
• one or more downhole components coupled with the stator.

A drilling string assembly comprising:

• a stator component, the stator component comprising a stator, a transmission housing, and a bearing housing, wherein the transmission housing is coupled between the stator and the bearing housing;
• a rotor component, the rotor component comprising a rotor, a transmission, a drive shaft and a drill bit, wherein the transmission is coupled between the rotor and the drive shaft, and wherein the drill bit is positioned at a distal end of the rotor component;
• a first bearing interfacing engagement between the rotor and the stator, the first bearing comprising a first polycrystalline diamond bearing element having a first diamond bearing surface, wherein the first polycrystalline diamond bearing element is positioned relative to the stator and the rotor such that the first diamond bearing surface is engaged with the metal bearing surface;
• a second bearing interfacing engagement between the rotor and the stator, the second bearing comprising a second polycrystalline diamond bearing element having a second diamond bearing surface, wherein the second polycrystalline diamond bearing element is positioned relative to the stator and the rotor such that the second diamond bearing surface is engaged with the metal bearing surface, and wherein the first bearing is spaced apart from the second bearing;
• and
• one or more sensors coupled with the stator component and configured to measure a direction of the drill string assembly;
• and
• a pad coupled with the stator component and an actuator coupled with the pad and configured to extend and retract the pad to steer a direction of the drill string assembly in a target direction.