Integral type directional drill rod provided with helical groove

Abstract

The invention relates to an integral type directional drill rod provided with a helical groove and used for directional drilling construction of soft outburst coal seams and broken coal seams of underground coal mine. The purpose of the invention is to provide the integral type directional drill rod with the helical groove, which not only can transmit a down-hole signal accurately in real time but also can be used for effectively handling drilling accidents such as bit jamming, bit burying and the like at the same time. The invention adopts the following technical scheme: the directional drill rod provided with the helical groove comprises a drill rod body and a central cable connection device arranged at a shaft line in the drill rod body, wherein quick connectors are arranged at the two ends of the drill rod body respectively; the helical groove is formed in the outer wall of the drill rod body; and the drill rod body, the helical groove and the quick connectors form an integral type structure. The directional drill rod has the benefits as follows: the twisting, bending and tensile strength of the drill rod is improved; the production efficiency is improved and the production cost is reduced; and the down-hole signal can be transmitted accurately in real time, and the drilling accidents such as bit jamming, bit burying and the like can be effectively handled at the same time, so that the drilling cost is lowered.

Description

technical field [0001] The invention relates to an integral spiral flute directional drilling rod used for directional drilling construction of soft outburst coal seams and broken coal seams underground in coal mines. Background technique [0002] The long-hole directional drilling technology has been widely used due to its controllable drilling trajectory. However, due to the complex geological conditions and the development of structural coal such as soft coal and broken coal, once serious drill holes such as sticking and buried drill occur Accidents can cause huge economic losses. The directional drill pipe used as a supporting drilling tool not only needs to have a structure with a large through hole to set the communication cable, but also requires the drill pipe to have high comprehensive mechanical properties to adapt to the compound forces such as tension, compression, bending, and torsion. At present, there are mainly two types of directional drill pipes: wireline ...

AI Technical Summary

Problems solved by technology

The wall thickness of wireline coring drill pipe is relatively small, and the torsion resistance, bending resistance and tensile strength of the drill pipe are relatively poor. When directional drilling is carried out in soft coal seams or water-swelling strata, accidents such as broken rods are prone to occur; Although the wall thickness of the cable-type high-strength large through-hole drill pipe is increased, the drill pipe has a flat outer structure. When encountering soft and protruding coal seams or broken coal seams, accidents such as drill sticking are prone to occur, which greatly increases the drilling cost.

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