Relationship between perforation depth and core flow efficiency

The perforation parameters have a large influence on the productivity of offshore wells. Perforation depth and core flow efficiency (CFE) are the key parameters for evaluating perforation response, but the relationship between these two parameters is seldom studied. In this paper, the perforation experiment and CFE evaluation are carried out. The results show that with the increase of confining pressure, perforation depth decreases, CFE increases, and perforation damage decreases. The CFE decreases with the increase of perforation depth, and the relationship between them satisfies the exponential function.