e-journal of drilling engineering is a peer-reviewed, open access journal published by Petroleum Journals Online. It covers fundamental and applied research, new technology, operations, and case studies in drilling engineering, well completion technology and well intervention. We do not charge readers any access fees. Papers are published within 2 to 3 months of initial submission. This journal participates in LOCKSS and CLOCKSS archival systems. Authors retain their copyright. Articles are covered by Creative Commons CC BY-NC-ND 4.0 license terms.