A buffer energy storage device for protecting downhole screw drilling tool and drill bit combination

Abstract

The invention discloses a buffer energy storage device for protecting downhole screw drill tool and drill bit combinations. The buffer energy storage device at least comprises a spindle, an energy storage assembly and a shell. The shell sleeves the spindle and is limited by an upper locking nuts and a shell locking nut, the upper locking nut is mounted at the upper end of the spindle, the shell locking nut is positioned at the lower end of the spindle, a transmission buffer cavity is formed by gaps between the shell and the spindle, the energy storage assembly is mounted in the transmission buffer cavity and comprises an energy storage nipple, a push cushion and an elastic buffer component, the energy storage nipple is in key connection with the spindle, and the lower end of the energy storage nipple is protruded at the lower end of the spindle. The buffer energy storage device has the advantages that drill pressures born by drill bits can be adjusted by the aid of the energy storage nipple, vibration can be reduced, the buffer energy storage device has an excellent torque transmission function and can be used as transmission portions of downhole power motors, accordingly, screw drill tools and the drill bits can be prevented from being damaged during churn drill, and certain buffer and protection effects can be realized for the screw drill tools and the drill bits; the distance from centralizers of the downhole power motors to the drill bits can be effectively shortened, and accordingly the angle building hole rates of the single-bend downhole power motors can be increased.

Description

technical field [0001] The invention relates to a device for protecting a downhole screw drilling tool and a drill bit combination, and belongs to the technical field of petroleum drilling tools. Background technique [0002] At present, with the development of drilling technology at home and abroad, the drilling speed has been greatly improved compared with the past, but the information from the drilling site shows that the drill bit in complex structure wells often stalls or runs away due to large torque and instability. In severe cases, the drill bit wears out and fails; in addition, during the run-in process, the drilling phenomenon often occurs, causing damage to the drill bit and damage to the screw drilling tool, which not only affects the service life of the drill bit and screw drilling tool, but also directly leads to a longer drilling cycle , The cost of drilling is greatly increased. [0003] In view of this, the Chinese invention patent "shock-resistant screw dr...

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Problems solved by technology

[0002] At present, with the development of drilling technology at home and abroad, the drilling speed has been greatly improved compared with the past, but the information from the drilling site shows that the drill bit in complex structure wells often stalls or runs away due to large torque and instability. In severe cases, the drill bit wears out and fails; in addition, during the run-in process, the drilling phenomenon often occurs, causing damage to the drill bit and damage to the screw drilling tool, which not only affects the service life of the drill bit and screw drilling tool, but also directly leads to a longer drilling cycle , The cost of drilling has greatly increased

[0003] In view of this, the Chinese invention patent "shock-resistant screw drilling tool" with the application number of 201110000167.4 discloses a screw drilling tool with a buffer device. There is a conversion joint for installing the drill bit, and a spring is provided between the drive shaft and the buffer sleeve to instantly eliminate the vibration generated by the drill bit and prevent the tools above the drill bit from being impacted; however, since the buffer device (buffer sleeve and spring) is installed on the transmission The shaft protrudes above the lower end of the housing, so the buffer increases the length of the drive shaft, limiting the overall rate of penetration of the drill, and the excessive length of the drive shaft increases the risk of drive shaft failure

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