Revelation on remaining oil and full length hydraulic simulation of single sand bodies based on 3D models in low permeability heterogeneous reservoirs

Key words:  Ordos Basin  heterogeneous reservoir  single sand body  mechanics model  full-length fracturing  revelation on remaining oil

Abstract:

Crack propagation laws in continental heterogeneity reservoir and the actual development of reservoir reconstruction processes are poorly understood. In this study we divided single sand body in a target zone in the Wangyao zone of Ordos Basin by using logging curves. Combining conventional logging and special logging, as well as sedimentary microfacies modeling of reservoir, we built a three-dimensional model of rock mechanics. Then, we carried outfull-length fracturing simulations of interwell reservoir and varying stress field. Through the distribution of cracks and the field performance data, we analyzed the producing degree in heterogeneous reservoirs. Our results indicate that significant variations of single sand body in tight sandstone reservoirs are present, therefore, fracturing simulations of single sand body based on real data of 3D models are needed. Through applications in Ordos Basin in recent years, increased production rate is obvious, and over 90％ success rate is reported among the implemented wells, with an average of more than 2 t/d production increase. The successful application suggests that the method is suitable for improving the residual oil potential in the mid-late development of low permeability heterogeneity reservoir.