Hydrofracture design parameter optimization method based on fine classification of reservoir

The invention discloses a hydrofracture design parameter optimization method based on fine classification of a reservoir. The hydrofracture design parameter optimization method based on fine classification of the reservoir comprises the following steps of (A) calculating current stratum coefficients Kh corresponding to all oil wells on the reservoir; (B) dividing the reservoir into four small categories; (C) calculating a net present value after hydrofracture for 3 years under the conditions that the fracture length ratio of a hydrofracture crack is 0.18-0.43 and the flow guiding capability of the hydrofracture crack is 10D.cm, 20D.cm, 30D.cm, 40D.cm and 50D.cm, and drawing a curve graph by using the fracture length ratio of the crack as an abscissa and the net present value after hydrofracture for 3 years as an ordinate; (D) using the crack fracture length ratio and the crack flow guiding capability which correspond to an inflection point with the maximum net present value as the optimal hydrofracture design parameters of the small categories of the reservoir; and (E) designing hydrofracture schemes on the different small categories of the reservoir by using the different optimal hydrofracture parameters. The principle of the hydrofracture design parameter optimization method is reliable; and the hydrofracture design parameter optimization method is easy and convenient to implement and can provide a refined guidance for parameter optimization in the hydrofracture scheme design.