Numerical simulation study on influence factors of hydraulic fracturing pressure in coal reservoir

In order to improve the fracturing efficiency of the coalbed methane well,an ANSYS finite element software was applied to simulate the different path and m ethod to reduce the seam fracturing pressure during the coalbed methane well fracturing process. A stress calculation model of the perforation completion was researched and established. Thus a simulated coal 1 rock fracturing pressure was calculated and the perforation borehole length, diameter,coal 1 rock Poisson's Ratio and Young's Mod ulus,strata depth and others affected to the coal 1 rock fracturing pressure were analyzed. The simulation results showed that when the perforation borehole length and dia meter were individually controlled about 1 m and 15 mm,the coal 1 rock fracturing pressure would be favorably reduced. A low coal 1 rock Poisson's ratio would be favorable to reduce the fracturing pressure in a certain degree. The coal 1 rock Young's Modulus would not have high influence to fracturing pressure. While more deep depth of sea m,the fracturing pressure would have a less influence by horizontal main stress difference.