Research Progress and Expectation of Sealing Materials for Coal Seam Gas Extraction Drilling
To improve the sealing technology of coal seam gas extraction drilling and reduce the risk of mine explosion,this paper firstly summarises the advantages and shortcomings of traditional sealing materials and new sealing materials by compa-ring them. We conclude that the new inorganic-organic composite slurry not only makes up for the shortcomings of polyure-thane-type organic materials,such as high cost,poor flame retardancy and high toxicity,but also improves the strength and bonding properties of cementitious materials,etc. Then,based on the bonding mechanism of coal interface of sealing materi-als,we summarise a series of modification experiments carried out by the researchers on the cementitious materials,and dis-cuss the effects of different admixtures and nano-materials,such as hydration characteristics,setting time,strength and other properties,as well as existing problems;finally,this paper puts forward suggestions and prospects from three aspects,name-ly,comprehensive improvement of performance,optimization of admixture combinations,and cost control.
gas extractionsealing materialssealing performancecement-based materialsinorganic material