Study on the productivity of the multi-stage fractured horizontal wells in tight oil reservoirs

Abstract

In this paper, a comprehensive dual-porosity and dual-permeability oil/water flow model that uses experimentally determined reservoir properties to simulate well performance of a multi-stage fractured horizontal well in tight oil reservoirs was established. The numerical simulation results was validated by the commercial simulator Eclipse and field production data. Besides, the effect of threshold pressure gradient, stress-sensitive matrix permeability, stress-sensitive fracture conductivity, and capillary pressure was conducted, revealing that those factors affect the well productivity in different degrees. The results indicate that the threshold pressure gradient can significantly reduce the well productivity. The impact of stress-sensitive coefficient should be significant to oil production in high stress-sensitive tight oil reservoirs. Also, the effects of fracture conductivity and capillary pressure on oil production was studied. This study provides a basis for long-term tight oil production analysis of hydraulically fractured tight oil wells. [Received: October 8, 2016; Accepted: January 28, 2017]