A coal seam gas drainage drilling hole sealing method

Abstract

The invention discloses a simple, economic and efficient coal seam gas drainage drilling hole sealing method. The method includes 1, drilling a gas drainage drilling hole in a coal seam pre-exhausting region from the drill site; 2, sleeving a screwed cloth sleeve with the length of 0.4 0.6 meters in the position 0.2 to 0.3 meter behind gas drainage pipe pores, allowing the end without a rubber band to face front, and fixing through a tape; allowing the end with the rubber band to face back, and bonding to the gas drainage pipe; 3, bonding a slurry injecting pipe to the gas drainage pipe, and allowing the front end of the slurry injecting pipe to locate 5 to 6 meters from the tail end of the gas drainage pipe; 4, sleeving another same screwed cloth sleeve to the gas drainage pipe 4 to 5 meters from the tail end of the gas drainage pipe; 5, bonding one bagged double polyurethane sealing bag in each position of the gas drainage pipe sleeved by the screwed cloth sleeves. The method is economic, simple to operate and high in toughness, and gas drainage drilling holes which are horizontally arranged or inclined at optional angles can be sealed effectively.

Description

technical field [0001] The invention relates to a hole sealing method for coal seam gas drainage boreholes, in particular to a coal seam gas drainage drilling hole sealing method. Background technique [0002] Coal bed methane is a kind of unconventional natural gas that is born in coal seams and is mainly stored in coal seams in an adsorbed state. It is commonly known as gas, and its main component is methane. The fundamental way to control coal seam gas is drainage. The quality of drainage borehole sealing determines the quality of gas drainage. High-sealed gas drainage boreholes can extract high-concentration gas, shorten the time of gas drainage, and save energy consumption. , improve enterprise efficiency. [0003] At present, the most commonly used sealing material for gas drilling in my country is polyurethane or cement mortar. Polyurethane sealing is expensive and the extraction concentration decays quickly. Cement mortar sealing is difficult to seal at the top of t...

AI Technical Summary

Problems solved by technology

[0003] At present, the most commonly used sealing material for gas drilling in my country is polyurethane or cement mortar. Polyurethane sealing is expensive and the extraction concentration decays quickly. Cement mortar sealing is difficult to seal at the top of the near-horizontal hole, and there is also drainage concentration decay. Faster problem; the hole sealing generally starts from the orifice, and the cracks are developed in this section, so the sealing is meaningless; most of the concentration of gas drainage in coal mines in my country is lower than 30%, the phenomenon of high sealing cost and high labor intensity is common, and it is urgently needed A coal seam gas drainage drilling and sealing method to solve this problem

Images