For the first time in Ukraine, Ukrnafta successfully performed perforation in a horizontal wellbore
For the first time in Ukraine, specialists of Ukrnafta successfully performed perforation in the horizontal section of the well, without involving third-party service companies, which reduced the cost of major well workover. This was reported by the chief geophysicist of Ukrnafta Andriy Starostin.
The main advantage of recovery of the productive formation with a horizontal wellbore is an increase in the drainage zone. This is especially noticeable in reservoirs with an effective thickness of less than 10 meters. The vast majority of wells in Ukraine, where the productive horizon is penetrated with a horizontal wellbore, are cased with slotted liners. However, this method has a drawback – the complexity of infiltration zone cleaning. So, the specialists of Ukrnafta decided to carry out re-perforation in the intervals cased with a slotted liner.
“In a well cased with a slotted liner in the horizontal section, perforation was carried out with a 100% effectiveness of the tubing conveyed heat-resistant jet gun over 18-meters interval with a density of 20 holes/meter, with 60 degrees oriented charges” the geophysicist noted. Teams from the СWO department, integrated field management department, production department, OGDU, and NIPI of Ukrnafta worked on the project for perforation in the horizontal section of the well.