Abstract:

In order to calculate productivity of hydraulic fracture horizontal wells precisely, considering the reservoir seepage, borehole wall inflow, fracture and perforation flows mutual influence, an unsteady state computation model of fractured horizontal well coupling with reservoir was established based on the superposition principle. Calculation results showed that compared to the horizontal well production only from fractures, the difference of that from fractures and perforations was great early and later decreased slowly. Because of mutual interference, different location fractures had different flow rates and the centralfracture production was lower than that of the outerfracture. The production of the fractures with horizontal well bore center symmetry was unequal due to the influence of well bore friction. Along with the fractures length increased, the horizontal well production increased. As the conductivity increased, the fractures production increased, while the perforations production decreased and the horizontal well production increased. With the longer perforation length, the interference of perforations and fractures interference became stronger, so the single perforation production reduced, while the perforation number increased, the horizontal well production increased. As the deepening of perforation depth, the horizontal well yield increased.

Key words: well bore, reservoir, coupling model, fractured horizontal well, unsteady state, affecting factor