An Adaptive Coring Inner Tube

Abstract

The invention discloses a self-adaptive type core sampling inner pipe which is composed of an inner pipe mechanism and an outer pipe mechanism. The inner pipe mechanism is arranged in the outer pipe mechanism. In an inner pipe, a hoop is arranged on a ring groove in a sleeving mode, an opening of the hoop is opposite to a slit, a hook head is embedded in a valley gutter to fix the moving direction of the hoop, the hoop moves downwards along the valley gutter, and thus the slit is closed. A wedge angle can prevent dislocation, the inner pipe is put into a drilling hole through a drill pipe via a fisher or the inner pipe is directly put into the drilling hole through the drill pipe; the inner pipe is lifted to the ground surface after a rock core is sampled, then the hoop is disassembled, a rock core pipe expands automatically, the problems that a semi-closed pipe is likely to be damaged and expanded in an ejecting mode are solved, and the rock core pipe cannot be blocked by the broken rock core. According to the self-adaptive type core sampling inner pipe, the semi-closed pipe and the rock core pipe are combined, the broken rock core can be conveniently poured, blocking can be avoided, the diameter of the rock core pipe can be enlarged or reduced, and normal drilling in the hole is ensured; meanwhile, the problems that the semi-closed pipe is likely to be damaged and expanded in the ejecting mode are solved, the drilling cost is reduced, the sampling rate of the rock core is increased, and the integrity and the reproduction quality of the rock core are improved.

Description

technical field [0001] The invention relates to a tool in the field of geological core exploration, in particular to an self-adaptive coring inner tube. Background technique [0002] As the demand for mineral resources increases and the mining depth increases, the requirements for drilling efficiency and quality are getting higher and higher. , the coring effect is significantly reduced, and it is even difficult to take cores, especially in small-diameter core drilling, there are problems such as low drilling speed, poor hole wall stability, and unreliable sampling. [0003] When drilling in deep formations, the volume expansion caused by the broken rock (mine) core will cause the plugging of the core tube. After the deep formation rock (mine) core is lifted to the surface, the formation pressure that originally bound the rock formation is released, and the rock (mine) ) core is further broken under the action of the pressure release and the volume expands, which is very ea...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve above-mentioned existing complex stratum coring difficulty, mostly is to adopt semi-combined pipe to improve rock (mine) coring rate and fidelity, but exists to reduce coring efficiency when using semi-combined pipe construction, Easy to deform and damage, affect the size of rock (mine) core, increase drilling cost, reduce work efficiency and other problems, and provide an adaptive type of coring inner tube

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