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Double-thread hollow coring drill rod

A hollow drill pipe, double thread technology, applied in drill pipe, drill pipe, drilling equipment, etc., can solve the problems of not representing the original occurrence and structure of sediments, without considering sediment disturbance, etc., to improve the coring rate, The effect of reducing disturbance

Inactive Publication Date: 2011-06-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Large-scale drilling rigs generally take hard rock formations as the drilling and coring target. Their coring technology does not consider the disturbance of sediments. Their coring rate for sediments is low, and the cores obtained cannot represent the original occurrence and structure of sediments.

Method used

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  • Double-thread hollow coring drill rod
  • Double-thread hollow coring drill rod
  • Double-thread hollow coring drill rod

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Embodiment

[0018] Such as figure 1 As shown, the metal hollow drill pipe 4 outer diameter (not including the outer thread) D1 is 116mm; the inner diameter D2 is 100mm, which is also the outer diameter of the polymer liner 2; the inner diameter D3 of the polymer liner 2 is 90mm (not including the inner thread) teeth); screw pitch P is 100mm.

[0019] Such as figure 2 As shown, a groove 5 is provided on the metal hollow drill pipe 4 , and a convex wedge 6 is provided on the polymer liner 2 . The convex wedge 6 is a linear convex wedge on the outer wall of the polymer liner 2, its thickness d is 3 mm, its width w is 5 mm, and the groove 5 matches it. Before use, the polymer liner 2 with internal threads is packed into the metal hollow drill pipe 4. After the groove 5 and the convex wedge 6 are combined, the axial positions of the drill pipe and the liner are fixed and cannot rotate freely. After drilling, the liner is removed from the drill pipe to obtain the core.

[0020] image 3 I...

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Abstract

The invention discloses a double-thread hollow core drilling rod, which consists of an inner thread, a polymer liner pipe, a metal outer thread and a metal hollow drilling rod, wherein the metal outer thread is arranged on the outer surface of the metal hollow drilling rod; the inner thread is arranged on the inner surface of the polymer liner pipe; and the metal hollow drilling pipe and the polymer liner pipe are connected through a groove and a convex wedge. The double-thread hollow core drilling rod is suitable for core drilling of various soft rock formations such as deposits, soil, frozen soil and ice, and is particularly suitable for core drilling of the deposits.

Description

technical field [0001] The invention relates to a drill pipe, in particular to a special drill pipe suitable for drilling and coring soft rock formations, soil, frozen soil, ice and soft deposits. Background technique [0002] Large-scale drilling rigs generally take hard rock formations as the drilling and coring target. Their coring technology does not consider the disturbance of sediments. Their coring rate for sediments is low, and the cores obtained cannot represent the original occurrence and structure of sediments. . [0003] Some of the hollow thread drill rods used in existing engineering drilling rigs are to reduce the dust in the drilling process (such as: CN85200953; CN200410073303.2); In order to form threaded pile holes in the soil and improve the bearing capacity of piles (such as: CN01250189.1, CN01250190.5, CN200610009969.0, etc.). The common feature of these patents is that the screw thread structure on the drill pipe is to mechanically fix and speed up i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/22
Inventor 叶瑛秦华伟陈鹰陈雪刚潘依雯
Owner ZHEJIANG UNIV
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