Thrust bearing pack for automatically regulating axial load of turbodrill

Abstract

The invention relates to a thrust bearing pack for automatically regulating the axial load of a turbodrill. The thrust bearing pack is composed of an upper bearing pack and a lower bearing pack, wherein the upper bearing pack is mounted at the top end of a turboshaft; the lower bearing pack is mounted at the bottom end of the turboshaft. The upper bearing pack is composed of 3-5 pairs of upper bearings, and the upper bearings are composed of upper bearing movable rings and upper bearing static rings; the lower bearings are composed of 3-5 pairs of lower bearings, and the lower bearings are composed of lower bearing movable rings and lower bearing static rings; a bearing head fastening nut and an output connector are in threaded connection with the turboshaft, and the upper bearing movable rings and the lower bearing static rings are tightly pressed on the turboshaft; the upper bearing movable rings and the lower bearing movable rings synchronously rotate along with the turboshaft. According to the thrust bearing pack, the opening degree of a flow guide hole is automatically regulated according to the size and the direction of the axial load of the turboshaft, a hydraulic load generated by a turbine section is in dynamic balance, the bearings no longer bear an impact load, and the service life of the turbodrill is prolonged.

Description

technical field [0001] The invention relates to a thrust bearing group for automatically adjusting the axial load of a turbine drilling tool, which belongs to the field of downhole power drilling tools for oil and gas. Background technique [0002] Turbodrilling tools have good development potential in ultra-deep well drilling and anti-deviation drilling, which can significantly increase the mechanical penetration rate and reduce drilling costs. With the development of drilling technology, the demand for turbodrills is increasing, but the service life of turbodrills is unstable, which limits the application and promotion of turbodrills. The service life of the turbodrill depends on the life of the thrust bearing group. The thrust bearing group works under high temperature, high speed and heavy load conditions. The thrust bearing group has a short life and is prone to failure. After the thrust bearing group fails, it is necessary to trip out the drill to replace the bearing,...

AI Technical Summary

Problems solved by technology

With the development of drilling technology, the demand for turbodrilling tools is increasing, but the service life of turbodrilling tools is unstable, which limits the application and promotion of turbodrilling tools

The service life of the turbodrill depends on the life of the thrust bearing group. The thrust bearing group works under high temperature, high speed and heavy load conditions. The thrust bearing group has a short life and is prone to failure

After the thrust bearing group fails, it is necessary to trip out the drill to replace the bearing, which is time-consuming and labor-intensive, increasing the cost

The existing thrust bearing set can only passively bear the downward hydraulic load and upward drilling pressure, and cannot actively balance and adjust the axial load of the turbodrill, resulting in poor bearing capacity and short life of the thrust bearing set

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