Down-hole rotary impact type drilling tool

Abstract

The invention relates to a down-hole rotary impact type drilling tool. The drilling tool is characterized in that an overflowing sleeve (1), an upper transmission spindle (6), a splined hub (8), an impact bearing seat (16) and a lower transmission spindle (22) are sequentially installed in a casing; an upper TC transverse bearing (4) and a rolling ball bearing pack (5) are sequentially installed outside the upper transmission spindle (6); a belleville spring (10), a vibration sleeve (12), a vibration starting seat (13), an impact heat (15), a PDC bearing (18), a lower TC transverse bearing moving ring (19) and a lower TC transverse bearing static ring (20) are sequentially mounted outside the impact bearing seat (16) and the lower transmission spindle (22); the impact heat (15) and the impact bearing seat (16) are connected through a flat key, the lower end face of the vibration sleeve (12) is connected with the upper end face of the vibration starting seat (13) through a flat key, and the vibration starting seat (13) is used for generating axial displacement and transmitting the axial displacement to the vibration sleeve (12) and the impact bearing seat (16). According to the down-hole rotary impact type drilling tool, low-amplitude high-frequency impact force is exerted on a drill, so that rock can be broken by the joint action of high-frequency periodical impact force with static-pressure rotation, the rate of penetration of hard stratums is effectively increased, drilling costs are reduced, and comprehensive technological and economic benefits of the drilling engineering are improved.

Description

Technical field: [0001] The invention relates to an underground rotary percussion drilling tool, belonging to the technical field of petroleum drilling tool design. Background technique: [0002] The traditional drilling method is mainly to break the rock by pure rotation. When the traditional rotary drilling method is used to drill into the hard formation, there is usually not enough torque to break the rock, so that the drill bit stops turning instantly. The torsional energy at this time is stored in the drill string. Once the torque required for shearing and breaking the formation is generated, the drill string energy will be released, and a much larger than usual impact load will be generated on the bit teeth, which will eventually cause the bit to fail On the other hand, with the traditional rotary drilling method, the rock is basically ground and broken. Due to the limited slag discharge speed, it is easy to form a deflection moment on the drill bit, resulting in well devi...

AI Technical Summary

Problems solved by technology

At this time, the torsional energy is stored in the drill string. Once the torque required to shear and break the formation is generated, the drill string energy will be released, and a much larger impact load will be generated on the drill bit teeth than usual, which will eventually cause the drill bit to fail. On the other hand, with the traditional rotary drilling method, the rock is basically ground and broken. Due to the limited slag discharge speed, it is easy to form a deflection moment on the drill bit, resulting in well deviation when drilling in hard rock and complex formations.

In addition, the rotary drilling method requires a higher rotational speed when drilling into hard formations, which increases the chance of collision between the drilling tool and the borehole wall, so accidents such as hole wall collapse are prone to occur

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