Spiral rotating shaft type local reverse circulation core drill bit

Abstract

The invention discloses a spiral rotating shaft type local reverse circulation core drill bit. The spiral rotating shaft type local reverse circulation core drill bit at least comprises a connector, a transition element, a communication element, an inner pipe and an outer pipe. The upper end of the connector is connected with a drill rod. The middle section of the connector is connected with the outer pipe. The lower end of the connector is connected with the transition element. The hollow transition element is internally provided with the communication element. The outer portion of the lower end of the communication element is connected with the inner pipe through an inner pipe connector. The inner pipe is arranged in the outer pipe in a sleeved mode. The outer pipe is connected with a reamer and a core drill head. The spiral rotating shaft type local reverse circulation core drill bit further comprises a spiral rotating shaft. The spiral rotating shaft is installed in the hollow communication element after being supported through a pair of conical roller bearings and two bearing bases. Meanwhile, the upper end of the spiral rotating shaft is connected into the connector, the interior of the lower end of the communication element leads to the inner pipe after being in threaded connection with a one-way part base, a large thrust bearing is arranged between the transition element and the communication element, a small thrust bearing is arranged between the transition element and the spiral rotating shaft, and the 'two-pipe single-rotating' effect in the drilling process of the drill bit is achieved. According to the spiral rotating shaft type local reverse circulation core drill bit, the spiral blade and two-pipe single-rotating reverse circulation working principles are combined, and the collecting rate of drill cores is effectively improved.

Description

technical field [0001] The invention is a local reverse circulation core drilling tool used for drilling in engineering fields such as mineral resource exploration and oil well drilling, and in particular relates to a spiral shaft type local reverse circulation core drilling tool used in loose, broken and other complex formations. Background technique [0002] At present, mineral resources around the world are becoming increasingly depleted, which requires drilling companies to develop mineral resources more economically and effectively. Core drilling is the most effective means to understand the structure and direction of mineral resources in the formation. As an important tool in drilling operations - drilling tools, its working performance directly affects the quality, cost and efficiency of drilling operations. [0003] Loose and broken complex formations are often encountered during drilling operations. Coring is very difficult when drilling into such complex formation...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a helical shaft-type local reverse circulation core drilling tool for the above-mentioned deficiencies in the existing loose and broken core drilling tools for complex formations, which combines helical blades and double-tube single-acting reverse The working principle of circulation can give full play to the advantages of local reverse circulation during drilling, and effectively improve the rate of core recovery

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