Deep well drilling actuator based on double-speed torque-converting bit and provided with drill string

Abstract

The invention belongs to the technical field of drilling and particularly relates to a deep well drilling actuator based on a double-speed torque-converting bit and provided with a drill string. The actuator comprises a bit drill pipe, a pressurizing support plate, pressurizing electromagnetic telescopic rods, a connecting structure, the drill, positioning brackets, a second positioning mechanism, a first positioning mechanism and the drill string, wherein the drill is mounted on the bit drill pipe mounted on the pressurizing support plate through a bearing, and the pressurizing electromagnetic telescopic rods are mounted on the positioning mechanism; the positioning mechanism adjusts the radial distance between positioning contacts on the positioning mechanism through the pressurizing electromagnetic telescopic rods, the drill string is located in the center line of a well body, the positioning mechanism can also be fixed relative to the well body, and a mounting platform is provided for a fixed part of the drill. When the drill is under pressure of the pressurizing support plate, the distance between the drill and the positioning mechanism changes, the connecting structure has characteristics of transmission and telescopic length, and transmission can be performed smoothly. The actuator has the better practical effect in structure and drilling positioning.

Description

Technical field [0001] The invention belongs to the field of drilling technology, and in particular relates to a deep well drilling actuator with a drill string based on a two-speed variable-torque bit. Background technique [0002] At present, drilling equipment often uses uphole power output, which is transmitted to the drill bit downhole through the drill string. When the drilling depth is required to be very deep, a long-distance drill string will be required, which is often formed by splicing multiple drill strings. When the drilled deep well is a directional drilling, the axis of the wellbore will have one or more inflection points, and it is difficult to ensure that the drill string is working on the centerline of the wellbore, which will cause the deviation of the drill bit. It is very necessary to keep the drill string on the centerline of the wellbore, or just keep the drill string near the connection with the drill bit on the centerline of the wellbore. [0003] As far...

AI Technical Summary

Problems solved by technology

On the one hand, the former requires a motor to drive the oil pump to produce hydraulic oil with pressure. Because of the oil pressure, oil leakage is often prone to occur, and the requirements for oil cylinder technology and sealing technology are relatively high, resulting in high cost and complicated mechanism; for the latter, use Driven by a motor, the structure is simpler than the former, but because of the meshing transmission between the gear and the screw, when the load changes suddenly, it is easy to cause fatal damage to the push rod, that is, the range of use is narrow

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