The Influence of Fracturing Fluid Volume on the Productivity of Coalbed Methane Wells in the Southern Qinshui Basin

Hydraulic fracturing is the main technical means for reservoir stimulation of coalbed methane (CBM) vertical wells. The design fluid volume (FFV) mainly through numerical simulation, and simulation method does not fully consider water block damage caused by leakage into reservoir. In this work, variance analysis was used to analyze production data 1238 CBM wells in Fanzhuang Zhengzhuang Qinshui Basin, clarify relationship between FFV peak gas (PGP) under different ratios critical desorption pressure (Rc/r), reveal controlling mechanism on migration. results show that both Rc/r have a significant impact production. When < 0.5, PGP decreases with increase FFV, beneficial 200–500 m3. > increases first then FFV. Specifically, favorable 500–700 Excessive significantly length fractures due leaks coal Instead, it more likely invade stay smaller pores, causing reducing Reservoirs high larger displacement pressure, which can effectively overcome resistance liquid migration thereby block. Therefore, conditions need match appropriate scale. This study provide guidance optimal hydraulic parameters