Horizontal Directional Drilling Rig Steering Drill Pipe

Abstract

The invention discloses a guide drill rod for a horizontal directional drilling machine. The guide drill rod comprises a drill column, wherein a cutting drill bit is arranged in the front of the drill column, a probe box used for monitoring the position of the cutting drill bit is arranged between the cutting drill bit and the drill column, and a hydraulic control rotary guide device is arranged between the probe box and the cutting drill bit. According to the guide drill rod, four guide pistons used for controlling the cutting direction of the cutting drill bit are uniformly distributed in the circumferential direction of the outer wall of an outer rod body, so that the direction of the cutting drill bit is changed to control a drilling track; by utilizing a valve core arranged in a flushing fluid flow channel, the stiffness coefficient of a compression spring and the pressure shift of the flushing liquid are reasonably distributed so as to control each function. The guide drill rod has the advantages of high drilling efficiency, strong guiding capacity, low requirements on operating skill level, and capabilities of greatly reducing hole-bottom accidents caused by damage and rupture of the drill column, improving the production efficiency and reducing the cost.

Description

technical field [0001] The invention relates to the engineering field of trenchless underground pipeline laying, in particular to a horizontal directional drilling machine guide drill rod. Background technique [0002] Horizontal directional drilling technology is widely used in trenchless pipelaying projects. Pipelaying projects are generally divided into three stages, namely pilot hole drilling, pullback reaming and pipe laying. The traditional pilot hole refers to the use of a beveled, small-diameter cutting drill to form a small-diameter pilot hole first according to the predetermined design trajectory, providing guidance for subsequent reaming and pipe laying, so the quality of the pilot hole It directly affects whether the entire hole project can be successfully completed, and is the basis and guarantee for subsequent pullback reaming and pipeline laying. However, there are many deficiencies in the traditional guide device: First, when drilling a straight hole without...

AI Technical Summary

Problems solved by technology

However, there are many deficiencies in the traditional guide device: First, when drilling a straight hole without deflection, it is easy to make the drilling trajectory deviate, which seriously affects the work efficiency. Second, when deflection and steering are required, the power head of the drilling rig does not rotate, and the drilling is achieved by relying on the orientation of the guide plate and the data of the surface monitoring instrument without rotating and pushing forward. This drilling method is less efficient. In addition, there must be an experienced and very skilled captain who can successfully complete the deflection and guidance with many years of practical experience, which is greatly affected by manual work.

Based on the above factors, the deviation between the drilling trajectory of the traditional guiding device and the designed trajectory is relatively large, the guiding direction is variable, and the inner wall of the drilling hole is uneven. The development of advanced devices is imminent

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