A Foam Metal Adjusting PDC Thrust Bearing Group for Bottom Hole Motor

Abstract

The invention discloses a foam metal adjusting PDC thrust bearing group for a bottom hole motor, which comprises a plurality of PDC thrust bearing mechanisms distributed along the axial direction of a drilling shaft. The PDC thrust bearing mechanism comprises a static washer, a dynamic washer and two spacer sleeves. For the PDC bearing on the rotating shaft, the moving rings of the two PDC bearings in the same PDC thrust bearing mechanism are close to each other and are sandwiched with a foam metal adjusting gasket and a moving outer ring gasket. The moving washer is located between the two PDC bearings and the rotating shaft. Between the two PDC bearings, the dynamic washer is sandwiched between two adjacent dynamic outer ring gaskets, and the static washer is sleeved outside the two PDC bearings and is in close contact with the static rings in the two PDC bearings. There are static outer ring gaskets, which are sandwiched between two adjacent static outer ring gaskets. The invention can evenly distribute the axial load to each pair of PDC thrust bearings of the PDC thrust bearing group, thereby improving the service life of the PDC thrust bearing group.

Description

technical field [0001] The invention relates to the technical field of bottom-hole motors in drilling engineering, in particular to a foam metal adjusting PDC thrust bearing group for bottom-hole motors. Background technique [0002] Drilling engineering bottom-hole motors, especially turbine motors (also known as turbo drilling tools), are used to speed up oil and gas (including conventional oil and natural gas, shale gas, natural gas hydrate, etc.) drilling, geothermal drilling, hot dry rock drilling, scientific drilling, etc. key tool. Turbine drilling tools are bottom-hole motors that convert fluid energy into mechanical energy. [0003] In order to reduce the extra workload of tripping, it is generally required that the bottom hole motor (including the turbodrill) have the highest possible service life and reliability. The thrust bearing set whose output end bears the axial load is a key component that determines the reliability and life of the turbo drilling tool. Fo...

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Problems solved by technology

[0004] In addition to the quality of the PDC sheet itself, the PDC bearing group has two core problems: one is to bear the axial load of several tons to tens of tons underground, and a pair of PDC bearings cannot be completed independently. The above PDC bearings are completed in parallel, and each pair of bearings bears an axial load of 1 / N; the second is that the parallel bearing group must bear the same preload for each pair of bearings during assembly, but during the processing and assembly of parts There are tolerances in both, so the existing PDC bearing group cannot distribute the dynamic load to each pair of PDC bearings, resulting in damage to the PDC bearings that bear larger loads

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