One-time well completion method through VCR method

Abstract

The invention discloses a one-time well completion method through a VCR method. The one-time well completion method comprises the following steps that a, a center hole is drilled in the center of a working face of a raise where a well is proposed to be completed, and then compensating holes and periphery holes surrounding the center hole are sequentially drilled by taking the center hole as a center; b, the center hole and the periphery holes are internally filled with explosives in a deck charge mode, and every two adjacent sections of explosives in the same hole are separated by a bulkhead;and c, the center hole is blasted firstly to expand a groove cavity, then a millisecond blasting method is utilized to conduct sectional blasting in the blasting sequence of the center hole first andthen the periphery holes, and tower blasting is formed till the whole raise is completely blasted. According to the one-time well completion method through the VCR method, one-time well completion canbe achieved by adopting the tower blasting mode, and the one-time well completion method has the advantages that the well completion effect is good and the well completion efficiency is high.

Description

technical field [0001] The invention relates to the technical field of beneficiation production, in particular to a one-time well-forming method by the VCR method. Background technique [0002] A raised shaft is a vertical or inclined shaft that connects two or more stages as a way to slide ore rock. In mining, because most of the mines are very high and the ore is transported frequently, in order to improve the transport efficiency and save costs, a pipeline similar to a well will be opened from top to bottom in some mines, and the ore will be dumped directly from top to bottom, and the transport vehicles will wait in the underground. Go, ship directly. On the one hand, the patio can improve the transportation efficiency. On the other hand, because it is directly dumped vertically, the use of height can play a certain role in crushing ore. [0003] The prior art with the Chinese patent notification number CN106089212 disclosed a hard rock rapid excavation raising blasting...

AI Technical Summary

Problems solved by technology

This patent first uses the VCR method to drill blasting blastholes, utilizes the free surface of the lower space and the compensation space of the surrounding holes to quickly form the central pilot tunnel of the patio, and then uses the blastholes outside the central pilot tunnel to implement lateral blasting once to complete the well; but in the actual well completion In the process, this kind of processing method still has the following defects: 1. This patent is to blast the cutting center successively at first. Since the free surface of the blasting cutting center only has the compensation hole and the narrow central guide tunnel below, it is successively blasting and digging from bottom to top. When the center of the groove is cut, the cross section of the center of the cut will become smaller and smaller, and the blast will be more difficult. This is due to the accumulation of errors in the center of each cut and blast, resulting in the highest well completion height of this patent can only reach 30m

2. When blasting the cutting center successively from the bottom to the top, due to the accumulation of errors in each blasting, the section of the cutting center becomes smaller and smaller, and it is very easy to cause blasting blockage in the middle and upper parts, and the entire guide tunnel center cannot be formed, and thus cannot be completed. blasting the entire wellbore

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