Abstract

In this paper, efficiency of various modifications of drill perforation intended for deep reservoir drainage and core sampling is analyzed. Real field data obtained from production and injection wells at different production areas of NGDU Aznakaevskneft from 2011 to 2014 were used. Field testing of perforators demonstrated that PS-500 drill perforator with increased drill exit (up to 40 cm) has undeniable advantages over the PF 112/35 milling perforator-core sampler with milling cutter exit of not more than 5 cm. PS-500 perforator produces 20-mm holes while milling perforator PF-112/35 yields 35-mm holes. It was proved, however, that the difference in perforators’ field performance is not attributable to diameter but rather to the depth of penetration, which enables, at least partially, to pass through formation damage area in bottomhole formation zone resulting from invading mud and cement filtrate. The authors make a reasonable conclusion that such an advantage of the PS-500 perforator makes it the most technological and cost-effective well intervention solution to increase the productivity of old production wells.

Key words:

drill perforation, milling perforation, formation damage area, perforator exit, specific production rate, idle time.

References

Authors

For citation: