Research Status and Progress of Water Lock Effect

Abstract

Hydraulic fracturing can effectively improve the air permeability of the coal seam and improve the gas extraction rate, but in the later stage of gas extraction, the water trapped in the coal blocks the gas migration. In order to deeply study the water-lock effect after coal seam hydraulicization measures, this paper summarizes the research status of the causes of the water-lock effect, the influencing factors of the water-lock effect, and the methods of mitigating or eliminating the water-lock effect, analyzes the existing problems in the current research, and puts forward the direction that needs to be strengthened.