Torsional impact drilling tool

Abstract

The invention relates to a torsional impact drilling tool used for applying low amplitude high frequency torsional impact to a drill bit during a drilling process, which can increase the drilling efficiency and the service life of the drill bit and lesson the tripping operation and the drilling cost. The technical scheme of the torsional impact drilling tool is as follows: a housing is connected with a short section of a drilling column led into the drill bit by a spline, and is positioned by a shaft shoulder; a screw motor rotor and a screw motor stator form a screw motor, the screw motor rotor is eccentrically connected to a transmission shaft by a universal shaft and two bearings, and four diversion holes are arranged on the transmission shaft; the lower end of the transmission shaft is connected with a carrier with a cavity; a sliding impactor is arranged in the cavity and is fixed by pins, and an impact hammer is arranged in the sliding impactor; a falling prevention ring is connected with the housing by screw threads; and the damping shaft shoulder on the short section of the drilling column led into the drill bit is matched with the impact hammer of the sliding impactor to form a ratchet wheel structure. The torsional impact drilling tool has simple structure, and can be used in hard strata of a deep well; and as being short, the tool is also applicable to the deflecting operation and can be used in crooked well holes, thereby reducing the phenomenon of stick-slip of the drill bit and improving the rate of penetration.

Description

technical field [0001] The invention relates to a torsional impact drilling tool used for applying low-amplitude high-frequency torsional impact to a PDC drill bit during the drilling process of oil and gas wells, and is also suitable for rotary drilling, top drive-mud motor compound drilling, directional drilling and Rotary steerable drilling. Background technique [0002] When PDC bits drill hard or abrasive formations, they often don't have enough torque to break up the formation, causing the bit to stop turning momentarily. At this time, the torsional energy is stored in the drill string, and the drill string will be tightened like clockwork. Once the torque required to shear and break the formation is generated, the drill string energy will be released, and a higher than usual force will be applied to the PDC teeth. Too much shock load, eventually shattering the diamond teeth and causing the bit to fail. During the drilling process, tripping and replacing failed PDC b...

AI Technical Summary

Problems solved by technology

At this time, the torsional energy is stored in the drill string, and the drill string will be tightened like clockwork. Once the torque required to shear and break the formation is generated, the drill string energy will be released, and a higher than usual force will be applied to the PDC teeth. excessive shock loads, eventually shattering the diamond teeth and causing the bit to fail

During the drilling process, tripping and replacing failed PDC bits is an important factor that increases the cost of drilling

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