Abstract
Scholars have conducted in-depth research on the seepage mechanism of oil and gas reservoirs, large-scale fracturing well productivity simulations, and reservoir phase behavior simulations, and corresponding models have been developed. However, models for calculating the productivities of fractured horizontal wells considering phase changes have not been reported. In this study, the productivities of fractures in a horizontal well were assumed to be unequal. The productivity equations for horizontal wells reported previously were modified and combined with the Peng-Robinson equation of state to describe the productivity in an actual production process. An example calculation showed that the number of fractures and the fracture conductivity have significant influences on the productivity. When the bottom hole pressure was 0.1 MPa, taking the fractured horizontal well with four fractures as an example, the tip pressure of the fourth fracture was 67.63% higher than that of the first fracture. The productivity contribution rate reached 30.48%. Using the proposed equation, we can calculate the open flow rates of gas wells and the amount of condensate oil in the fractured horizontal well gas reservoir's development process. This paper provides a reference for the selection of the gas reservoir production mode and the optimization of the fracture parameters.
NSTL