A new production prediction model for multistage fractured horizontal well in tight oil reservoirs

To better evaluate the production performance of tight oil reservoirs,it is urgent to solve the multistage fractured horizontal well production enigma. It is paramount to develop new models to analyze the well performance for tight oil reservoirs. In this paper,a new production prediction model of multistage fractured horizontal well in tight oil reservoir was established. In this model,unsteady transfer flow between fracture and matrix was considered. This model was solved by using Laplace transform method,line source function and Stehfest method comprehensively. The production prediction type curves including pressure transient analysis curves and rate transient analysis curves were then obtained. According to these type curves,eight flow regimes were obtained as early wellbore storage period,skin factor period,bi-linear flow regime,linear flow regime,first radial flow regime,transition flow regime,transfer flow regime and later radial flow regime. In the end,a field case history matching result was given and four key parameters' effect on tight formation well production was analyzed. This research is of both theoretical significance and practical value for tight oil development.