Application of ultra-low concentration multi-component modified guar gum fracturing fluid in coalbed methane wells

In order to solve the problem of serious damage to coalbed methane reservoir caused by a large amount of residue after gel breaking of conventional guar gum fracturing fluid, a new type of multi-component modified guar gum DX-HPG was developed by alkalization and etherification of conventional guar gum, and a set of ultra-low concentration multi-component modified guar gum fracturing fluid system suitable for coalbed methane reservoir was prepared. The fracturing fluid system has good shear resistance, sand carrying performance and gel breaking performance. The residue content and surface tension of the gel breaking fluid are lower than those of the conventional hydroxypropyl guar gum fracturing fluid, and the permeability damage rate of the gel breaking fluid to coal core is less than 13%, which is far less than that of the conventional hydroxypropyl guar gum fracturing fluid. The field application results show that the performance of ultra-low concentration multi-component modified guar gum fracturing fluid system meets the requirements of field operation design, and the gas production of XS-1 well after fracturing is significantly higher than that of adjacent wells using conventional hydroxypropyl guar gum fracturing fluid, which has played a good fracturing stimulation effect.