Water-locking type unconsolidated formation sampling drilling tool

A loose and water-locking technology, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of difficult to meet the quality requirements of drilling sampling, loss of formation information, and difficulty in catching springs, etc., to achieve good preservation and high quality Sampling, Simple Effects

Inactive Publication Date: 2012-04-18
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Water-locking type unconsolidated formation sampling drilling tool
  • Water-locking type unconsolidated formation sampling drilling tool

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Embodiment Construction

[0018] The present invention will be further described in conjunction with accompanying drawing:

[0019] Such as figure 1 As shown, the water-locking type loose formation sampling drilling tool of the present invention includes a drill bit 8, an outer cylinder body 12 and a core pipe 7, and a drill bit 8 is threaded below the outer cylinder body 12, and the outer diameter of the drill bit 8 is greater than that of the outer cylinder body 12. outer diameter, which can ensure that there is a certain gap between the water hole on the warehouse seat 6 and the surrounding soil. The core pipe 7 is arranged inside the outer cylinder 12, and also includes a piston 13, a warehouse seat 6 and a seal. The plug switch, the piston 13 is a cylindrical sealing piston, a groove is arranged on the outside of the cylindrical sealing piston, a sealing ring is arranged in the groove, and the drill bit 8 is threaded with the outer cylinder 12 connection, the drill bit 8 has an inner flange below...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/02
Inventor 王瑜刘宝林
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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