A bottom-hole motor pdc plane thrust bearing group

Abstract

The invention discloses a bottom-hole motor PDC plane thrust bearing group, which includes several thrust bearing groups arranged in parallel between the output shaft of the bottom-hole motor and the drilling tool shell. The bearing unit and the lower bearing unit; the upper bearing unit includes moving gaskets and PDC bearings arranged in sequence; the middle bearing unit includes moving adjustment washers, static gaskets, PDC bearings, moving gaskets and PDC bearings arranged in sequence, and the middle The PDC bearings, dynamic gaskets and PDC bearings arranged in sequence in the bearing unit are provided with static adjustment washers; the lower end bearing unit includes dynamic adjustment washers, static gaskets, PDC bearings and dynamic gaskets arranged in sequence; dynamic adjustment A plurality of slits are respectively arranged in the radial direction of the washer and the static adjustment washer. The reliability of the PDC bearing group is greatly improved and the cost is reduced; at the same time, the rigid washer can meet the requirements of strength and elasticity at the same time.

Description

technical field [0001] The invention relates to the technical field of bottom-hole motors in drilling engineering, in particular to a PDC plane thrust bearing group of a bottom-hole motor. 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 drilling (including conventional oil and gas, shale gas, natural gas hydrate, etc.), 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. For decades, countries ha...

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Problems solved by technology

[0004] However, there are two major problems in the existing PDC bearing group: 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, and several pairs or even more than ten pairs of PDC bearings need to be connected in parallel according to different working conditions Complete, each pair of bearings bears an axial load of 1 / N; the second is that the parallel bearing set must bear the same preload for each pair of bearings during assembly, but there are tolerances in the parts processing and assembly process, so it is necessary Solve this problem structurally; in addition, the more important thing about this structure is to distribute the dynamic load to each pair of bearings during the drilling process, and buffer the dynamic load by the buffer structure to avoid the rapid fragmentation of PDC

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