Hollow screw drill assembly

Abstract

The invention discloses a hollow screw drill assembly which comprises an outer assembly and an inner assembly arranged in a rope coring channel of the outer assembly in a sleeved mode, and the inner assembly is a coring inner assembly or a drilling inner assembly. The outer assembly comprises a coring drill bit, a lower lengthened connector, a hollow screw motor and an upper guide connector. The coring inner assembly comprises a fishing head, a positioning clamp, a coring pipe single-acting mechanism, an underground environment and working condition monitoring and storing module and a coring pipe which are sequentially connected from top to bottom. The drilling inner assembly comprises a fishing head, a positioning clamp, a connecting part, an underground environment and working condition monitoring and storing module and an inner drill bit which are sequentially connected from top to bottom; in the drilling and coring process of the hollow screw drilling tool assembly, the hollow screw motor can provide a high rotating speed for a shaft bottom drill bit, and the coring footage speed is increased. The hollow screw rod structure is adopted, a rope coring drilling tool can be installed in the inner space, a winch can be adopted for fishing after a rock core is drilled every time, all the drilling tools do not need to be pulled out, and coring time is saved.

Description

technical field [0001] The invention relates to the technical field of core drills, in particular to a hollow screw drill assembly. Background technique [0002] Wireline coring drilling is a geological exploration drilling construction method in which the inner assembly of the drilling tool is put into a special wireline drill pipe. Since the coring process does not need to lift hundreds or thousands of meters of drill pipe out of the surface, the work efficiency is greatly improved. [0003] The outer assembly of the drilling tool used in the conventional wireline coring drilling method is composed of an outer pipe connected to a wireline drill pipe, and the inner assembly includes an inner pipe, a retaining spring and a single-action suspension assembly, and the drill pipe and the drill bit are driven by the rotational power of the ground surface. Rotary broken rock. With the development of coring drilling, we will encounter various complex coring environments. For exam...

AI Technical Summary

Problems solved by technology

[0005] 1. In the process of drilling and coring, it is impossible to provide high speed for the bottom of the well, resulting in a slow rate of coring footage

[0006] 2. Conventional screw motor The hollow screw motor has a solid structure and cannot use wireline core drilling tools. After each core is obtained, all drilling tools need to be lifted out of the bottom of the well. When the well depth is large, time is wasted and costs are increased.

[0007] 3. Existing hollow screw cannot realize full-section drilling

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