ABDULRAHEEM, Mustafa. Optimization of Beam Pumping Systems in Heavy Oil Reservoirs: Reducing Friction and Enhancing Volumetric Efficiency Through Variable Speed DriveControl. Wasit Journal of Engineering Sciences, [S. l.], v. 14, n. 2, p. 470–468, 2026. DOI: 10.31185/wjes.Vol14.Iss2.956. Disponível em: https://ejuow.uowasit.edu.iq/index.php/ejuow/article/view/956. Acesso em: 3 jun. 2026.