Effect Evaluation of Different Productivity Release Processes in Wushi 17–2 Oilfield

The main reservoir in Wushi 17–2 oil field is a low-permeability sand conglomerate reservoir with complex pore-throat structure and low natural productivity. It is necessary to adopt appropriate productivity release technology to improve single well productivity. On the basis of parameter optimization and reservoir physical property improvement evaluation of the three productivity release processes of multi-branch horizontal wells, acidification and hydraulic pulse vibration, this paper evaluates the stimulation effect of the three productivity release processes and the combination of each process by numerical simulation. The results show that for the productivity release process of multi-branch horizontal well, two or three branches are optimal and the optimal branch length is 300 m. The mud acid system of 12%HCl + 3%HF can effectively improve the reservoir physical properties of Wushi 17–2 oilfield. The hydraulic pulse vibration process can increase the reservoir permeability to 1.52 times at a vibration frequency of 15 times/min. The optimal productivity release process is the combination of dual-branch horizontal well and acidification.