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Broken drill pipe salvage device inside pile foundation hole

A salvage device and pile foundation hole technology, which is applied in the directions of earthwork drilling, wellbore/well components, etc., can solve the problems of increasing drilling cost, easy breakage of drill pipe, and large drilling engineering loss.

Inactive Publication Date: 2015-05-13
CHINA COMM 2ND NAVIGATIONAL BUREAU 3RD ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the drilling process of the rotary drilling rig, if it encounters abnormal geological conditions or special underground hard objects, the thinnest drill pipe is easy to break. If the broken drill bit cannot be salvaged, the drill hole can only be scrapped and cause a larger project. loss
Because the drill bit of the rotary drilling rig is relatively large and heavy, and the drill pipe at the fractured part is too thin, once the drill pipe breaks, the existing salvage mode is difficult to work, and the hole has to be re-drilled, which prolongs the drilling construction period and increases Large drilling cost

Method used

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  • Broken drill pipe salvage device inside pile foundation hole
  • Broken drill pipe salvage device inside pile foundation hole
  • Broken drill pipe salvage device inside pile foundation hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 and figure 2 As shown, the clamping element of the drill pipe clamping mechanism in this embodiment is a steel ball and the storage cover is in the shape of a trumpet with a small top and a large bottom. The storage cover in this embodiment can also be a truncated cone with a small top and a large bottom.

[0021] The present invention includes a drill rod box 1 and a storage tube 2 fixedly connected sequentially from top to bottom. The lower end of the rotary drilling rig 3 in the drill rod box 1 is hinged, so that the present invention is very convenient to assemble and disassemble. The storage tube 2 is welded by the drill pipe sleeve 21 and the trumpet-shaped storage cover 22, which is convenient for receiving the broken drill pipe 6 . A drill pipe clamping mechanism 5 is arranged in the radial direction of the drill pipe sleeve 21, and the drill pipe clamping mechanism 5 includes four wedge-shaped clamping boxes 51 axially evenly distribut...

Embodiment 2

[0023] Such as image 3 and Figure 4 As shown, the wedge 53 of this embodiment is placed in the wedge-shaped clamping box 51 as a clamping element, and the bevel angle β of the wedge-shaped clamping box 51 is equal to the wedge angle α of the wedge-shaped clamping box 51, both of which are within 10°≤α≤13° Within the range, the wedge 53 is in a non-movable self-locking state, which can achieve the purpose of clamping the broken drill pipe 6. The cross section of the wedge 53 is a horizontal T-shape, and the horizontal side 531 of the horizontal T-shape stretches out from the axial notch 211 of the drill pipe sleeve 21, and the wedge 53 of the T-shaped structure can prevent it from moving outwards from the drill. Rod sleeve 21. In this embodiment, the storage cover 22 is shaped like a truncated cone with a small top and a large bottom, which is convenient for processing and forming; The shape of the storage cover 22 can also be a trumpet shape with a small top and a bi...

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Abstract

The invention discloses a broken drill pipe salvage device inside a pile foundation hole. The broken drill pipe salvage device inside the pile foundation hole comprises a drill pipe box and a storage barrel, wherein the drill pipe box is hinged to the lower end of a rotary drilling rig through a transverse pin, and the storage barrel is formed by fixedly connecting a drill pipe sleeve and a storage cover; a drill pipe clamping mechanism is arranged in the radial direction of the drill pipe sleeve and comprises a plurality of wedge-shaped clamping boxes evenly distributed around the drill pipe sleeve in the axial direction, and straight edges of the wedge-shaped clamping boxes are opened and correspond to axial notches of the drill pipe sleeve; clamping elements are arranged in the wedge-shaped clamping boxes, and when the drill pipe clamping mechanism clamps a broken drill pipe, the multiple clamping elements transversely move out of the respective axial notches and abut against the wedge-shaped surfaces of the respective wedge-shaped clamping boxes. The broken drill pipe salvage device inside the pile foundation hole is simple in structure, is convenient to use, can take the broken drill pipe out of the pile foundation hole, and avoids the situation that the broken drill pipe can not be taken out and the pile foundation hole is scraped. The construction period is shortened, the construction efficiency of the pile foundation hole is improved, and the construction cost of the pile foundation hole is greatly reduced.

Description

technical field [0001] The invention relates to a processing device for pile foundation drilling construction faults, in particular to a device for breaking drill pipes when drilling with a rotary drilling rig, and belongs to the technical field of pile foundation construction. Background technique [0002] Rotary drilling rigs are widely used in municipal construction, highway bridges, high-rise buildings, dock embankments and other foundation construction projects. With different drilling tools, they are suitable for dry (short spiral), or wet (rotary bucket) and rock formation (core drill) Hole forming operation has the characteristics of large installed power, large output torque, large axial pressure, flexible maneuvering, high construction efficiency and multi-function. With the development of pile foundation drilling technology, the rate of pile foundation drilling using rotary drilling rigs is getting higher and higher. Although rotary drilling rigs have many advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/18
CPCE21B31/18
Inventor 刘忠友施瑾伟周厚平冯俭华王勇
Owner CHINA COMM 2ND NAVIGATIONAL BUREAU 3RD ENG
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