SU1495434A1 - Apparatus for drilling holes with air-blasting - Google Patents

Abstract

The invention relates to a drilling technique. The goal is to increase reliability and reduce metal consumption. The device includes pneumatic impact tools 5 with rock-breaking tools 6 and a drill string (BC), along which the hermetic casing (K) 9 of elastic material is located. The internal cavity K 9 communicated with the internal cavity of the BC. When drilling with air pressure supplied to the BC, K 9 is inflated, which creates an annular channel optimal over the cross section for transporting the destroyed rock from the bottom to the surface. The parameters of the device are selected so that the air pressure inside K 9 is greater than the maximum pressure of the air flow in the annular gap. The elastic material of the K 9 walls prevents the possibility of its getting stuck in the well by upwardly growing rock particles. 1 il.

Description

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The invention relates to a drilling technique, and in particular to devices for drilling large diameter wells with air blowing. The purpose of the invention is to increase the reliability of work and reduce metal consumption.

The drawing shows the device, the overall appearance.

A device for drilling wells with air blowing comprises a base machine 1, a turn-guide device 2 of the base machine, a rotator 3 of the drill string 4, an air hammer NIKI 5 with rock-breaking tools 6, for example, crowns. Parallel pneumatic impactors are fastened to each other by clips 7, and their working cavities communicate with the internal cavity of the drill string by means of a collector 8. The collector 8 also fastens the strikers with the drill string. Along the drill string there is a sealed casing 9, filled with elastic material. The internal cavity of the casing communicated through channels (not shown) with the internal cavity of the drill string 4.

A device for drilling wells with air blowing works as follows.

Compressed air is supplied to the internal cavity of the drill string, under the action of which they start to work

hammers 5, and their crowns 6 times0

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crumbling rock. As the drill string rotates, the rotator 3 forms a well of the calculated diameter. At the same time, the air pressure is inflated by the casing 9, which creates an annular channel that is optimal over the cross section for transporting the destroyed rock from the bottom to the surface. The parameters of the device are selected so that the air pressure inside the casing is greater than the maximum pressure of air flow in the annular gap. The elastic material of the casing walls prevents the casing from getting stuck in the well by upwardly rising rock particles. After stopping the drilling, the air supply is turned off and the casing reduces its dimensions, allowing the device to be lifted at a higher speed.

Claims (1)

Invention Formula A device for drilling wells with air blowing, including pneumatic impact tools with rock-destruction tools with the internal cavity of the drill string.