H. Yar’Adua, K. , Abbas, A.J. , J. John, I. , M. Suleiman, S. and Kabir, A. 2021. Investigating the Effect of Varying Tubing Air Concentration during the Descaling of Petroleum Production Tubing using Multiple High-Pressure Nozzles. American Scientific Research Journal for Engineering, Technology, and Sciences. 76, 1 (Feb. 2021), 185–198.