Application of Dilation-Recompaction Model in Fracturing Optimisation in Tight Oil Reservoir

Abstract

Tight oil and gas reservoirs are characterized by strong heterogeneity, poor physical properties, low single well production, difficult development and others. The volumetric stimulation fracturing technology has become a key technology for the effective utilization of tight reservoirs. In the current fracturing optimization design, there are some limitations in simulating the true pattern of fracture propagations because the geological model is relatively simple and it is not necessary to consider the heterogeneity of reservoir plane. At the same time, the effect of large-scale and large-volume injection of fracturing fluid on formation permeability field cannot be neglected in the volume stimulation, and the coupling relationship between fracturing fluid loss and reservoir seepage is not considered in conventional productivity simulations so that the effective stimulated reservoir volume (SRV) cannot be calculated accurately. In this paper, a numerical simulation technology of fracturing based on rock deformation is introduced through theoretical analysis and field application. The effective SRV is analyzed quantitatively, and the optimization simulation method of volume stimulation parameters with the effective SRV as the evaluation objective is formed preliminarily, which guides the fracturing design of volume stimulation in tight oil blocks.