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Dth-hammer drilling device and overburden drilling method

An equipment and DTH technology, applied in drilling equipment and methods, drilling equipment, drill bits, etc., can solve the problems of small hole diameter, unsatisfactory drilling speed, high flow rate of flushing medium, etc.

Inactive Publication Date: 2008-06-18
地质力学水和环境技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It has been found that the known drilling devices on the one hand require a high flow rate of the flushing medium and on the other hand in certain applications the drilling depth is not sufficient, the drilling speed is to a certain extent unsatisfactory or the resulting borehole diameter is small

Method used

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  • Dth-hammer drilling device and overburden drilling method
  • Dth-hammer drilling device and overburden drilling method
  • Dth-hammer drilling device and overburden drilling method

Examples

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Embodiment Construction

[0023] in accordance with figure 1 In the embodiment of FIG. 2 , the drilling machine 1 comprises a drill pipe 2 with a central waste duct 3 and an air supply duct 4 arranged peripherally. A connecting piece 5 is welded to the lower end of the drill pipe 2 in which a DTH drilling head 6 is screwed via its central connector 7 comprising a compressed air supply opening 8 through which the The DTH drilling head 6 is supplied with compressed air for driving its percussion drill 9 . The diameter of the drill bit 9 is larger than the diameter of the drill pipe 2 and larger than the diameter of the driving part of the DTH drill bit 6 . In the connecting piece 5 , a supply line section 10 leads obliquely downwards from a centrally arranged waste line 3 of the drill pipe 2 to a laterally arranged inlet opening 11 . The air duct part 13 leads from the peripheral air duct 4 of the drill pipe 2 to the central area of ​​the connector 7 of the drilling head via the connection annulus 111 ...

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Abstract

The invention relates to a DTH-hammer drilling device, comprising a down-the-hole- (DTH-) hammer (6) with a percussion drill bit (9), a drill pipe (2) with a waste conduit for the cuttings and at least one supply conduit for the flushing medium and a flushing medium supply device, wherein a seal (18) for sealing the borehole against the borehole opening is provided in a fixed distance from the drilling head (6), or wherein a casing tube (12) is connected to the drill bit (9). The invention further relates to an overburden drilling method, comprising rotating a drill bit (9), supplying an energy transfer medium through a drill pipe (2) to the rotating drill bit (9) for transmitting a percussive action thereonto, dragging a casing tube (12) along with the drill bit (9) and flushing away cuttings through the drill pipe (2).

Description

technical field [0001] The present invention relates to a drilling device, in particular a drilling device utilizing a down-the-hole hammer, and to a drilling method, in particular for overburden drilling. Background technique [0002] Drilling equipment known as "down-the-hole hammers" has a rotating percussion drilling head that is lowered into the borehole. Other terms used to refer to drilling equipment are "Inhole-hammer" and "DTH-hammer", and these terms will be used hereinafter. [0003] In the context of the present application, overburden drilling is used to denote a drilling method in which the pipe providing the casing for the borehole is dragged at least in the region of the bottom of the borehole. [0004] In the published German patent application DE 43 10 726 A1 a drilling rig with a DTH hammer is described, in which compressed air as flushing medium is supplied from the peripheral duct of the drilling rig to the center of the drill head by means of a A cent...

Claims

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Application Information

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IPC IPC(8): E21B21/12E21B33/126E21B7/20
CPCE21B21/12E21B33/126E21B7/20E21B10/38
Inventor 约翰尼斯·阿布特弗兰克·弗莱施曼
Owner 地质力学水和环境技术公司