Abstract:

The technology of the stimulated reservoir volume(SRV) fracturing are often used in shale horizontal wells to obtain deliverability. The fracture network volume and permeability are critical to postfracture response. The design for SRV employs productivity prediction model which is complex and inconvenient in application to optimize fracture network parameters at present. The relation model between the fracture network parameters and hydraulic fracturing treatment sizes is established with the fracture network equivalent to a high permeable zone by using the principle of seepage rate equal effects. The method and steps for SRV in shale horizontal wells are put forward also, including feasibility study about SRV in shale reservoir, optimizing fracture network parameters in numerical simulation and treatment sizes. According to the characteristics of QY2 shale oil horizontal wells, the new design method is implemented. The result shows that the high permeable zones have the biggest contribution to flow potential in shale wells, and the cumulative production and degree of reserve recovery increase slowly with the augment of clustering number, volume, permeability of the high permeable zones. There exsit the optimal high permeable zone's parameters. Field application shows that the design method is convenient and can be generalized to other shale horizontal well fracturing design.

Key words: shale reservoir, stimulated reservoir volume fracturing design, equivalent seepage, high permeable zone