Water-locking type unconsolidated formation sampling drilling tool

Abstract

The invention discloses a water-locking type unconsolidated formation sampling drilling tool. The drilling tool comprises a drill bit, an external cylinder, a coring tube, a piston, a bin base and a plugging switch, wherein the drill bit is connected to the lower end of the external cylinder; the coring tube is arranged in the external cylinder; the piston is arranged in the coring tube; the upper part of the coring tube is connected with the bin base which is connected with the coring tube in a sealed mode; a through hole which is connected with the coring tube is formed in the bottom surface of the bin base; the plugging switch is arranged in the through hole; and a water hole is formed in the wall of the bin base. The water-locking type unconsolidated formation sampling drilling tool has a simple structure, can efficiently sample unconsolidated and broken formations such as sandy soil layers, soil layers, gravel-containing layers and the like in a high-quality way, has a high sampling rate, particularly can preserve the sequence state of the formations well, and is suitable for environmental sampling, geotechnical investigation and surveying sampling and the like of the unconsolidated and broken formations and the like, and the obtained samples are undisturbed and are high in fidelity.

Description

technical field [0001] The invention relates to the field of sampling drilling tools, in particular to a sampling drilling tool adapted to loose formations. Background technique [0002] In the prior art, when sampling the soil, sampling drilling tools such as semi-combined pipes, multi-layer pipes, and piston drilling tools are often used, such as the patent number "CN201120048021. "Tool" provides a sampling drilling tool, which includes an outer tube that rotates and excavates under the action of an external force, and an inner tube that is used as a soil sample packaging tube, and also includes a retaining ring that fixes the soil sample, and one end of the retaining ring is connected to the inner tube. The front ends are connected, and the other free end is provided with a number of sheet-shaped teeth. When the sheet-shaped teeth move forward with the retaining spring and the inner tube relative to the outer tube to encapsulate the soil sample, they will move toward the ...

AI Technical Summary

Problems solved by technology

This kind of sampling drilling tool can certainly keep the original shape of the sample taken when carrying out horizontal sampling, but when carrying out vertical sampling in loose formations, due to the rocking of the sample's own weight and the lifting process, the snap spring is often difficult to Catch the sample in the core tube, resulting in loss of core, making the sampling rate low, difficult to meet the quality requirements of drilling sampling, and losing important formation information

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