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Percussion drilling head

A rock formation and geological technology, applied to drilling equipment and methods, drill bits, drilling equipment, etc., can solve the problems of insufficient cuttings to be taken out, high force of drilling cutter, and obstruction of drilling device rotation, etc.

Inactive Publication Date: 2007-05-30
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that the drill cutter has to withstand high forces due to excessive wear of the drill cutter due to hammering
Another disadvantage is that part of the hammering energy is absorbed into the contact surface between the drill bit and the hammering part
[0007] A further disadvantage is that the cuttings are not sufficiently removed due to the absence of a breaking action during the ascent of the drill piece
[0008] Another disadvantage is that when using a sharp cutter that will penetrate the rock formation, the cutter will hinder the rotation of the drilling unit

Method used

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Examples

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Embodiment Construction

[0034] Fig. 1 shows a schematic cross-sectional view of a drilling device 1 of the present invention. The drilling device 1 includes a rotatable body 2 . A drilling cutter 4 is arranged on the axial end face 3 of the rotatable body 2 .

[0035] The device also includes a reciprocating impact member 5 arranged on the rotatable body 2 . The striker is driven by a hydraulic cylinder 6 . The impact cutter 7 is arranged on the axial end surface of the impact member.

[0036] Figure 2 shows a bottom view. The figure shows the section line I-I, along which Fig. 1 is taken. The striker 5 has a fan-shaped cross-section in which the nozzle 8 is arranged. The rotatable body 2 has a shape complementary to the sector of the striker. The rotatable body 2 and the impact member 5 together form a circular section.

[0037] Fig. 3 schematically shows the operation process of a drilling device 1 of the present invention. The rotatable body 2 makes a rotational movement R. The drilling c...

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Abstract

The invention relates to a device for drilling into geological formations, which device comprises: - a rotatable body; - drilling cutters arranged on an axial end surface of the rotatable body; - a percussion part, which is parallel to the rotating axis reciprocatable arranged on said body; and - percussion cutters arranged on an axial end surface of the percussion part. The invention further relates to a method for drilling into geological formations, which method comprises the steps of: - bringing a percussion part with a percussive movement in contact with the formation in order to crack at least a part of the formation, and scraping the cracked parts of the formation with a drilling part.

Description

technical field [0001] The present invention relates to an apparatus and method for drilling into geological formations, the apparatus comprising: [0002] - a rotatable body; [0003] - a drilling cutter placed on an axial end face of the rotatable body; Background technique [0004] Such devices are generally known devices. The drilling cutters generate a rotational movement by which they scrape the bottom part of the drilling to be formed. These cuttings are then extracted by, for example, drilling fluid. [0005] But when the borehole must be drilled into a geological formation where the formation material is relatively hard, the speed of the scraping action is very low and the throughput is also low. [0006] In order to alleviate this disadvantage, it is known to use a drilling device based on the same principle as a percussion drill. In this device, a drill member is rotated and a hammer member hammers against the drill member. The vibrations caused by the hamme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00E21B10/40
CPCE21B10/40E21B7/002
Inventor 佩特鲁斯·C·克里塞尔斯迪雷·H·泽斯林
Owner SHELL INT RES MAATSCHAPPIJ BV