Composite acid fracturing method for horizontal well

The invention discloses a composite acid fracturing method for a horizontal well. The composite acid fracturing method comprises the following steps that (1) after well drilling of a horizontal section of the horizontal well is completed, a screen pipe is put into the horizontal section of the horizontal well for well completion; (2) a coiled tubing is put into the horizontal section of the horizontal well for dragging acid distribution and fixed-point acid distribution; (3) an effective layer section is determined according to well logging or well logging interpretation of the horizontal section of the horizontal well, and a multi-stage hydraulic jetting segmented acid fracturing tool is put into the horizontal section of the horizontal well; and (4) segmented acid fracturing constructionis conducted through the multi-stage hydraulic jetting segmented acid fracturing tool. According to the composite acid fracturing method for the horizontal well, large-range acid fracturing transformation is conducted on an