Method for extracting gas of protected layer through wear layer drilling in protective layer airway high-position drilling field

Abstract

The invention discloses a method for extracting gas of a protected layer through wear layer drilling in a protective layer airway high-position drilling field. A high-position drilling field is arranged in a protected layer airway, and then linear wear layer drilling and curved wear layer drilling are respectively performed to a protected layer in the high-position drilling field through a common drilling machine and a directional drilling machine; and after the drilling construction is finished, hole sealing is performed and gas extracting pipelines are connected to the protected layer to perform the gas extraction. The method is used for the gas extraction in the protective layer extraction technology, the gas of the protected layer can be pre-pumped before the protective layer is exploited, and the relief-pressure gas extraction of the protected layer is achieved after the protective layer is exploited. By means of the method, the construction cost is reduced, the extraction period is shortened, potential safety hazards are eliminated, and safety management is facilitated.

Description

technical field [0001] The invention relates to a gas drainage technology, in particular to a method for drilling gas in a protected layer through layer drilling in a high-level drilling field in a protective layer wind tunnel. Background technique [0002] "Regulations on the Prevention and Control of Coal and Gas Outburst" stipulates that regional outburst prevention measures must be taken in outburst coal seams, and the protection layer mining technology is a major regional outburst prevention measure, which involves two coal seams, the protective layer and the protected layer. The coal seam that is first mined to eliminate the outburst danger of the adjacent coal seam (protected seam) is called the protective seam; due to the mining function of the protective seam and the simultaneous extraction of pressure relief gas, the adjacent outburst dangerous coal seam can be transformed into no outburst danger The coal seam, the protruding dangerous coal seam is called the prote...

AI Technical Summary

Problems solved by technology

However, this method requires a large amount of engineering, high investment costs, and a long construction period, which not only increases the cost but also affects the mining cycle; the gas entering the roadway along the cracks may cause the gas concentration in the floor rock roadway to exceed the limit, resulting in difficulties in the daily management of the floor roadway ,There are security risks

Images