Synthesis and characterization of water injection fracturing fluid for wetting and softening coal seam

Abstract

This study aims to achieve dust control from the source, reduce the dust concentration of coal mining faces, and provide a safe and pollution-free working environment for underground operators. In this study, dodecyl polyglucoside was used as the matrix material , tris-benzoic acid was used as the crosslinking agent, and eramidopropyl was used as the graft. A new carboxylic anionic surfactant (CAS) was prepared by esterification and amidation crosslinking reactions, nano sodium carboxymethyl cellulose was a micellar accelerator, and a new type of anionic fracturing fluid was prepared. The reaction process and structure of the product were analyzed by infrared spectroscopy , X-ray diffraction and scanning electron microscopy, and the thermal stability of the product was analyzed by thermogravimetry experiments. Related performance testing experiments showed that CAS had a relatively low surface tension , and the product had a relatively high shear viscosity and low filtration. Compared with water and carboxymethyl guar gum fracturing fluid, the product has a better wetting and softening effect on coal. In addition, through molecular dynamics simulation, it is determined that CAS in the product can form a good connection with coal molecules and act firmly on the surface of coal, which greatly promotes the wetting of coal.