Crossing hole, heat injection and hydraulic flushing synergistic extraction-promoting enhancing method

Abstract

The invention discloses a crossing hole, heat injection and hydraulic flushing synergistic extraction-promoting enhancing method. The crossing hole, heat injection and hydraulic flushing synergistic extraction-promoting enhancing method comprises the following steps of that crossing holes are constructed in a bottom plate rock roadway, end hole points of the drilled holes are formed in a latticedarray, and the two adjacent drilled holes are named as a heat injection hole and an extraction hole correspondingly; extraction pipes are arranged for the drilled holes, and a special hole packer is fed into a second extraction pipe for hole sealing; high-temperature and high-pressure nitrogen is injected into the heat injection holes through the special hole packer, the adjacent extraction holesare always used for normal gas extraction, and it is guaranteed that coal escaped gas is extracted away in time after being heated; and the extraction pipes in the heat injection holes are connected with an extraction system to perform gas extraction work, so that the gas extraction effect is further enhanced. In conclusion, the crossing hole, heat injection and hydraulic flushing synergistic extraction-promoting enhancing method is scientific in principle, ingenious in design, tight in hole sealing, safe, reliable, capable of being combined with hydraulic flushing, capable of greatly enhancing extraction-promoting enhancing effect through heat injection, capable of being widely applied to rock cross-cut coal uncovering, fault crossing, mining face permeability-increasing and extraction-promoting, gas extraction enhancing and other work, and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a method for intensifying and promoting pumping by drilling through layers and injecting heat in cooperation with hydraulic punching. Background technique [0002] Most coal seams in my country have the characteristics of "three lows and one high" (low permeability, low saturation, low reservoir pressure, and high degree of metamorphism). The low permeability of the coal seam makes it difficult to extract gas, resulting in the imbalance of "pumping-excavation-mining" in the mine, forming a major safety hazard, and laying hidden dangers for the occurrence of coal mine gas accidents. Therefore, scholars at home and abroad have proposed hydraulic cutting, protective layer mining, deep hole blasting, CO 2 Phase change fracturing and other technical measures to increase permeability of coal seam and promote drainage. However, due to various reasons, f...

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Problems solved by technology

[0009] In order to solve the deficiencies in the prior art, the present invention provides a method of through-layer drilling and heat injection combined with hydraulic punching to enhance pumping, which solves the problem of low heating efficiency and unsafeness of the heat injection medium, and that conventional hole sealers cannot be applied to high temperatures conditions, poor sealing effect, poor drainage effect caused by pure hydraulic punching, etc., to achieve the purpose of strengthening the sealing effect under high temperature and normal temperature conditions, improving the degree of coal heat injection to enhance drainage, and improving the effect of coal seam gas drainage. Purpose

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