The effect of engineering parameters on production capacity of a fractured horizontal well in tight oil reservoirs

Terrestrial tight oil in China has the characteristics of poor reservoir properties and strong heterogeneity. Large-scale volumetric fracturing of horizontal wells is one of the few solutions to achieve economic exploitation. Horizontal well productivity after fracturing is affected by many complex factors. Therefore, by using the numerical simulation method, the ellipsoidal fracture network containing the major fracture and the minor fracture is designed by the method of locally densifying grids to simulate the productivity of a single well of the tight reservoir of Changqing Oilfield and analyse the affecting factors on the productivity. The results show the horizontal well productivity increases with the length of the horizontal section, the number of fractured stages, the volume of SRV, and the complexity of the fracture network, but the increment gradually decreases. The orthogonal test method was used to rank the influencing degree of engineering parameters on productivity. It was found that the influencing degree of fractured horizontal well productivity in tight oil reservoirs was decreasing from SRV volume, fractured stages, the complexity of fracture network to the length of horizontal section.