Study on Evaluation Method of Single Well Formation Pressure in Fracture-vuggy Reservoir

Obtaining the formation pressure of the reservoir is the key to dynamic analysis. At present, the formation pressure of a single well in a fracture-vuggy reservoir is mainly obtained through the well test analysis of the pressure recovery curve. Modern well test interpretation is needed to obtain the formation pressure of a single well. It is impossible to perform well test for each well on site, and it is also impossible to perform well test in real time. Another method is to regard the fracture-vuggy reservoir as a closed reservoir, and use the production dynamic data such as production and flow pressure to obtain the formation pressure of a single well according to the principle of quasi-steady flow in the oil well. However, this method is limited by the linear segment analysis. It is also affected by changes in the physical parameters of the fluid. Aiming at the insufficiency of existing test methods to obtain formation pressure, this paper analyzes the adaptability of the current single well formation pressure evaluation method, and proposes a method to calculate formation pressure by applying production dynamic data back calculation, so as to establish a single well formation pressure evaluation method, and has been successfully applied in the field. The application results show that this method makes up for the shortcomings of the previous methods, but at the same time, it also has the problem that the formation pressure fluctuates correspondingly due to the fluctuation of data. Through the analysis of actual production, this method is the most feasible method to obtain formation pressure on site.