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This is to certify that your paper entitled «Employing Montmorillonite Effect in Creating Natural Surfactant When Colliding with Heavy Oil and Reducing the Injective Fluid Loss in the Surfactant Injection to Fracture Reservoir Approach» was indexed with 14 pages, in the CIVILICA citation database, code COI:OGPD08_023, after evaluation and approval of the referees of the "Eighth International Oil, Gas, Refining and Petrochemical Conference with Development Approach to State, University and Industry held in Shiraz 2018.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.