Variperm’s perforated liner systems are a proficient and cost effective way to establish communication between the reservoir and the well bore. Multi spindle drill presses are used to produce liners which have a standard open area of 3%. Perforations per meter, hole diameter, phasing, and open flow area percentage are adjustable per client specification.

The stress concentration factors introduced into the liner as a result of the perforation process are limited when circular holes are used. As a result the residual stresses caused by the bending and torsional loading which occurs during the installation of the liner are minimized. Every perforated casing and tubing joint is put through a comprehensive drifting and deburring process utilizing Variperm’s High Pressure Pneumatic Drifting tool which ensures a burr free liner and full I.D. perforations with no restrictions on the I.D. of the liner.