Method and application of acidizing fracturing in carbonate formations

A method of acidizing fracturing in carbonate formations, including following steps:

• (1) designing a propagation direction and a propagation length of an artificial fracture according to a target location in a fracture-vug formation and a wellbore structure after well completion, tripping a drilling-fracturing integrated tool in a wellbore, and creating the artificial fracture through drilling in the wellbore with a designed initiation location and a designed propagation azimuth;
• along a direction of entering the wellbore, the drilling-fracturing integrated tool is from bottom to top in proper order and comprises:
• a PDC bit, a downhole motor, a flexible drilling tool, an open hole packer and a combined acidizing tubing;
• along the direction of entering the wellbore, the flexible drilling tool in the drilling-fracturing integrated tool sequentially comprises a measuring short section, a weighted drill pipe short section and a common drill pipe short section from bottom to top;
• (2) sealing the artificial fracture by using the open hole packer, and injecting fracturing fluid into the artificial fracture to increase pressure until initiation to create fracture network I;
• and
• (3) injecting acid for acidizing fracturing treatment on the fracture network I to create fracture network II.