Coal mine underground abrasive continuous supply system

Abstract

The invention discloses a coal mine underground abrasive continuous supply system. The coal mine underground abrasive continuous supply system adopts the flow direction of fluid as a downstream direction, and comprises a first feeding mechanism, a second feeding mechanism, a jet flow adding mechanism for adding abrasives to the first feeding mechanism and the second feeding mechanism, a high-pressure water mechanism for supplying high-pressure water to the first feeding mechanism and the second feeding mechanism and a water spray mechanism for spraying the high-pressure water for water jet operation, wherein the first feeding mechanism and the second feeding mechanism are arranged in parallel. The water spray mechanism is connected with the first feeding mechanism and the second feeding mechanism. The first feeding mechanism and the second feeding mechanism are both feeding mechanisms. The coal mine underground abrasive continuous supply system provides a basis for a plurality of operation modes, greatly enhances the adaptability of the coal mine underground abrasive continuous supply system, enables continuous operation, and avoids the defects of water transportation.

Description

technical field [0001] The invention relates to the technical field of water jet operations such as hydraulic fracturing, in particular to an abrasive supply system and a supply method thereof. Background technique [0002] In recent years, techniques such as hydraulic punching, hydraulic slitting, and hydraulic fracturing have been widely used in the field of gas control and have achieved remarkable results. In order to make these processes have a wider range of application and better gas control effects, abrasives need to be added to the traditional pure water jet to increase the cutting ability of the jet or support artificial gaps. [0003] There are two modes of adding abrasives: pre-mixing and post-mixing. However, due to the influence of the structure of the post-mixing abrasive jet device, it is difficult to use in the field of gas control. Some scholars try to apply the pre-mixed abrasive jet in the field of gas control, but the traditional pre-mixed abrasive jet i...

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Problems solved by technology

[0004] The inventor studied the way of transporting abrasives by means of water jets, and found that the transport of abrasives by water jets has a greater wear on the pipeline

At the same time, most abrasives are easy to harden when exposed to water. During the experiment, the residual moisture can easily wet the abrasive at the bottom of the silo through the Venturi tube, causing the abrasive to harden and block at the bottom of the silo, affecting the normal feeding function.

If gas is used to transport abrasives, there are practical technical difficulties: using gas as a carrier, it is necessary to effectively separate the carrier gas from the abrasives, so as to avoid the carrier being ejected together with the abrasives, which will have a negative impact on the water jet operation and even lead to water jetting. job failed

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