Abstract: Using large real triaxiality fracturing simulation experiment system, the effect of perforation mode on the fracture pressure and cranny geometric shape through simulating the stratum condition, monitoring the fracturing process and pressure and observing cranny split and stretch shapewas studied in the paper.The research results showed that under the condition of invariable in-situ stressmagnitude and distribution, fracture pressure would increase if the perforation angle increased, fracture pressure would decrease if the number of perforation increased.In order to efficiently decrease fracture pressure and improve fracturing success ratio and effectwe should select perforation angle 0°, and under the permission of sleeve allowable strength the more the perforating density is, the better itwillbe. The cranny shape ofSingle tierperforationwas simple, and the cranny shape of more tier perforation was complex.

Key words: perforation, fracturing, fracture pressure, cranny geometric shape, experiment