Rope core taking drill

Abstract

The invention discloses a rope core taking drill which comprises an outer pipe assembly and an inner pipe assembly. A reamer (23) is arranged in the outer wall assembly, and an inner pipe (14) and a third layer core pipe (15) are arranged in the inner pipe assembly. The rope core taking drill is characterized in that the lower end of the reamer (23) in the outer pipe assembly is connected with an external connector (16), and the lower end of the external connector (16) is connected with an external drill head (19). The lower end of the inner pipe (14) of the inner pipe assembly is connected with an inner drill head (20), and the inner drill head (20) protrudes forwards relative to the external drill head (19). The inner drill head is inserted into the outer drill head in a spline mode, and the inner drill head can be fished out together with the inner pipe, a clamping spring seat (18) and a clamping spring are arranged at the lower portion of the inner side of the third layer core pipe (15), and a blocking spring (17) is arranged on the outer side of the third layer core pipe (15). Regarding complex formation of fracture development, hard brittle fracture, soft and hard interbedding and the like, the drill has the advantages of prolonging the service life to the largest extent, increasing drill lifting intervals, improving the core recovery rate and the like.

Description

Technical field [0001] The invention relates to the field of drilling engineering, in particular to a corded core drilling tool applied to complex formations such as developed fissures, hard and fragile, soft and hard interbedded layers. Background technique [0002] Rope core drilling tool is a drilling tool that can remove the core from the bottom of the hole without lifting the drill bit and drilling tool. It has been widely used in the drilling of solid mineral cores at home and abroad. It has long pure drilling time, low labor intensity and high drilling quality. , Less accidents in the hole, low drilling cost and other advantages. [0003] The conventional rope core drilling tool is composed of an outer tube assembly and an inner tube assembly, which are collectively referred to as a double tube. The outer tube assembly includes a cartridge stopper, a cartridge chamber, a reamer and a drill bit, and the inner tube assembly The components include spearhead, elastic caliper, i...

AI Technical Summary

Problems solved by technology

[0004] However, for conventional wireline core drilling tools, when encountering complex formations such as hard and brittle, soft and hard interbedded, the working environment of the drill bit is very harsh. The advance speed is slow and the drilling interval is short. In addition, because the conventional wireline coring tool lacks a mechanism to protect the core, the broken sample is easy to be eroded and easy to fall off, which reduces the core recovery rate.

It is easy to cause the drilling to be scrapped

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