Large changing diameter double-drag-blade hole reaming drill

Abstract

The invention relates to a large changing diameter double-drag-blade hole reaming drill for deep stratum mineral exploitation and oil gas well underground hole reaming, and solves the problem that a conventional drill cannot change diameter, or the diameter changing range is too small. The technical scheme is that a main cylinder body is in screw thread connection with a lower joint; two drag blades are hinged to hinge supports of the main cylinder body through pin bolts; a rotary cylinder body is sleeved in the main cylinder body; an outer central pipe is sleeved in the main cylinder body; bulge splines at the outer part of the outer central pipe are embedded into a screw groove in the inner part of the rotary cylinder body; three sliding blocks respectively penetrate through three through grooves of the main cylinder body, and are embedded in a ring-shaped groove in the outer part of an inner central pipe; the outer central pipe is connected with the sliding blocks through bolts; the upper part of the inner central pipe is in screw thread connection with a water nozzle; a thrust bearing a is sleeved in the outer central pipe, and is contacted with the rotary cylinder body; a reset spring is mounted on the upper end surface of the thrust bearing a; a baffle ring is in screw thread connection with the outer central pipe; one ends of arch connecting rods are hinged to the rotary cylinder body, and the other ends of the arch connecting rods are hinged to the drag blades; cutting teeth are embedded on the drag blades. The drill is large in diameter changing range, simple to control and reliable in structure, and can be used for the hole reaming operation.

Description

Technical field [0001] The invention relates to a large variable-diameter two-wing reaming bit used for deep formation mineral exploitation and downhole reaming of oil and gas wells. Background technique [0002] With the continuous increase in the mining depth of various types of mineral resources, traditional manual mining methods can no longer meet the production needs, and the deeper the mineral resources, the more complicated the working conditions and the greater the probability of personnel safety accidents. At present, mineral resources in shallow formations have been exploited in large quantities. In order to meet the needs of production and development, people will continue to mine mineral resources in deeper formations. Due to the limitations of complex working conditions in deep formations, due to the safety and economic considerations of personnel, deep Stratum mining will completely use mechanical drilling and mining technology, no longer relying on workers to go do...

AI Technical Summary

Problems solved by technology

[0004] At present, the drill bits used to drill oil and gas wells are basically not adjustable in diameter. There are very few drill bits with reaming function that have a small reaming range, and their variable diameter range is far from meeting the technical requirements of mechanical drilling and mining technology. Therefore, it must be aimed at mechanical drilling. Reaming bits designed for mining technology

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