Ultra-deep horizontal drilling equipment with righting function

Abstract

The invention provides ultra-deep horizontal drilling equipment with a righting function. The equipment includes a drill rod, a drill bit which is fixedly connected to the tail end of the drill rod, and variable-diameter centralizers which are fixed to the drill rod. The variable-diameter centralizer comprises a cylindrical mounting piece, a plurality of rolling pieces and an adjusting assembly, wherein the rolling pieces are rotatably mounted outside the mounting piece through first rotating shafts, and the adjusting assembly is adjustably mounted on the mounting piece and used for controlling the rotating angles of the rolling pieces. The plurality of rolling pieces are circumferentially distributed around the central axis of the mounting piece, and the first rotating shafts are respectively perpendicular to the central axis of the mounting piece. The beneficial effects of the invention are as follows: when horizontal drilling operation is carried out; a plurality of reducing centralizers are respectively arranged on the drill rod; the outer contour size of the reducing centralizer closest to the drill bit is adjusted to be larger than that of other reducing centralizers, when reducing is needed, the rolling piece can be controlled to rotate through the first adjusting assembly, then the rolling piece can be unfolded or folded, and finally the outer contour size of the reducing centralizer is increased or decreased.

Description

technical field [0001] The invention relates to the field of horizontal drilling construction, in particular to ultra-deep horizontal drilling equipment with a straightening function. Background technique [0002] In tunneling and underground engineering, it is usually necessary to use a drilling rig to drill a well hole with a small diameter and a certain depth underground. This operation is called drilling. Drilling operations usually include vertical drilling and horizontal drilling. In long-distance horizontal drilling operations, due to the influence of the self-weight of the drill bit and drill pipe, the trajectory of the drilling hole will deviate from the design axis. That is, the front end of the drill bit will be relatively The rear end of the drill pipe has a downward deflection, so that the trajectory of the hole is inclined downward. Therefore, it is necessary to set several centralizers on the drill pipe to adjust the elevation angle of the drill bit. [0003]...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides ultra-deep horizontal drilling equipment with centralizing function, which solves the problem of inconvenient transportation and management when using existing hard centralizers to construct ultra-deep horizontal drilling, However, when the existing soft centralizer is used to construct ultra-deep horizontal drilling, it cannot effectively solve the problem that the drilling trajectory deviates from the predetermined axis

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