Method for improving complexity of fracture and construction efficiency of horizontal well

The invention discloses a method for improving the complexity of a fracture and the construction efficiency of a horizontal well, and is designed to solve the problems, such as low complexity and small discharge volume of the fractured fracture of the horizontal well. The method is characterized in that a plurality of the horizontal wells are deployed in the same well site, shafts of the horizontal wells are parallel mutually, and each shaft is perpendicular to a maximum principal stress direction of a stratum; positions of perforated intervals of each adjacent well are distributed in a staggered manner; each adjacent well is fractured in sequence in a staggered manner. In the process of fracturing, as each shaft is subjected to stress interference caused by staggered fracturing in sequence, a large amount of high-complexity microfractures in staggered distribution are generated on both sides of each fracture, thus the reconstruction volume of an oil layer is increased, and the single-well yield is improved. In addition, the intervals between the fracturing sections of the horizontal wells are lengthened, thus the number of the fracturing sections can be decreased, the single-well fracturing cycle can be shortened, and the construction efficiency can be greatly enhanced.