Study of tight oil reservoir flow regimes in different treated horizontal well

With the development of oil exploration and production technology, tight oil reservoir development has attracted more attention in oil industry worldwide. Tight oil will be the important unconventional oil resources of future oil increased reserves and production. The tight oil generally refers to the oil resources that have experienced short distance transport and gathered in tight sandstone, tight limestone and tight carbonate reservoir layer, which is interbedded symbiosis with or close to the source bed, and the overburden pressure matrix permeability is less than or equal to 0.1 mD and reservoir porosity is less than 10%. Based on the fluid properties, formation characteristics and development measures of Chang 8 formation tight oil reservoir in Ordos Basin, the models of horizontal well, fractured horizontal well, volume fractured horizontal well and multi-stage fractured horizontal well are established through the methods of reservoir engineering and numerical simulation. Those 4 different wells are laid in box-shaped tight oil reservoirs. The fluid flow stages and regimes of the 4 models are studied in detail in the paper, and the effect of wellbore storage coefficient, skin factor, fracture half-length, fracture stage spacing and the main fracture conductivity to flow regimes were analyzed. The results of this study will be helpful to develop tight oil reservoir and understand flow regimes.