Abstract: On the basis of rock mechanics near horizontal wellbore under three axial geostresses and gas pressure,a fracturing propagation model of multipulse gas load Fracturing is established by using elasticity,fracture mechanics theory and weighting function.The proposed gas distribution function is considered to derive corresponding stress strength.So the alternation of structure length and width can be simulated and the influence of different fracture parameters on deliverability can also be analysed.The result show that multipulse gas load Fracturing can generate multifractures along horizontal well,the fractures can propagate in the direction of perforation orientation until they come to the end,different fracture number may bring different fracture length;the multipulse gas load fracturing can remarkably increase production of oil well,and fracture length has great impact on oil production,so the fracturing should be designed to increase length and to decrease fracture number on the field.

Key words: multipulse, gas fracturing, horizontal well, fracture propagation, deliverability evaluation