High Quality Content by WIKIPEDIA articles! Packers Plus Energy Services Inc. is a privately held, Calgary-based oilfield service company that provides completion equipment and services. The company specializes in multi-stage fracturing systems for open hole, horizontal wells and deals with unconventional reservoirs.. Multi-stage fracturing systems are used for hydraulic fracturing, or breaking up tight rock formations to enable release of oil and gas in petroleum reservoirs allowing for segmentation of horizontal wells into sections or stages such that they can be fractured individually. This allows for complete fracture coverage of the entire length of the wellbore.. This multi-stage fracturing technique was developed by Packers Plus, but has been adopted by many completions and operations companies, unlocking previously unrecoverable resources.