Study on fracture propagation characteristics of hydraulic fracturing in steeply inclined coal reservoirs

Due to the rapid changes in burial depth in steeply inclined reservoirs (SICR), there is a significant change in stress in the up-dip and down-dip directions within the drainage range of CBM wells, and the expansion of fracturing fractures is different from that of near horizontal reservoirs. Based on the field fracturing data of steeply inclined reservoirs in Fukang West Block of southern Junggar Basin, this study analyzed the bottom hole pressure and fracture morphology characteristics in the process of hydraulic fracture of steeply inclined reservoirs, studied the fracture propagation characteristics of steeply inclined reservoirs by using the finite element numerical method, and expounded the impact of dip angle (stress gradient) on the fracture propagation of coal reservoirs. The results show that according to the stress and fracture propagation characteristics in the up-dip and down-dip dip directions, steeply dipping reservoirs are divided into shallow-steeply dipping reservoirs, middle-steeply dipping