Obah, Boniface, Petroleum Engineers/Lecturers, Department of Petroleum Engineering, Federal University of Technology, Owerri, Imo State, Nigeria. (Nigeria)
Obibuike, U. J., Department of Petroleum Engineering, Federal University of Technology Owerri, Imo-State, Nigeria.
Obibuike, U. J., Institute of Petroleum Studies, University of Port Harcourt, Nigeria.
Ofesi, S. F., Department of Petroleum and Natural Gas Engineering, Federal University of Petroleum Resources, Effurun, Delta State, Nigeria.
Ohaegbulam, C. M., Department of Petroleum Engineering, Madonna University of Nigeria. Akpugo, Enugu State.
Ohia, N. P., Department of Petroleum Engineering, Federal University of Technology, Owerri, Imo State, Nigeria.
Ohia, Princewill N., Petroleum Engineers/Lecturers, Department of Petroleum Engineering, Federal University of Technology, Owerri, Imo State, Nigeria. (Nigeria)
Ojha, Keka, Enhanced Oil Recovery Laboratory, Department of Petroleum Engineering (India)
Okereke, N. U., Department of Petroleum Engineering, Federal University of Technology Owerri, Imo-State, Nigeria.
Olayiwola, Saheed Olawale, Petroleum Engineering Department, The Petroleum Institute, Khalifa University of Science and Technology, Abu Dhabi, UAE. (United Arab Emirates)
Oliveira, Marcelo Firmino de, Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo. Av. Bandeirantes 3900, Monte Alegre. 14040-901, Ribeirão Preto, SP, Brazil.
Onaiwu, David O., Petroleum Engineer/Lecturer, Department of Petroleum Engineering, University of Benin, Benin City, Edo State, Nigeria. (Nigeria)
Onwukwe, S. I., Department of Petroleum Engineering, Federal University of Technology, P.M.B 1526, Owerri, Imo State, Nigeria.
Onwukwe, S. I., Associate Professor, Federal University of Technology, Owerri, Nigeria. (Nigeria)
Onwukwe, S. I., Department of Petroleum Engineering, Federal University of Technology, Owerri, Imo State, Nigeria.
Onwukwe, S. I., federal university of technology owerri, Imo state, Nigeria (Nigeria)
Onwukwe, Stanley I., Department of Petroleum Engineering, Federal University of Technology Owerri, Imo-State Nigeria.
Onyejekwe, I. M, Department of Petroleum Engineering, Federal University of Technology, Owerri, Nigeria.
Osinowo, Olawale
Osinowo, Olawale Olakunle, Department of Geology, University of Ibadan, Ibadan, Nigeria. (Nigeria)
Osinowo, Olawale Olakunle, [a] Earth Science and Engineering Department, Imperial College London. [b] Department of Geology, University of Ibadan, Ibadan, Nigeria.
Ossai, Patrick G. O., Petroleum Engineers/Lecturers, Department of Petroleum Engineering, Federal University of Technology, Owerri, Imo State, Nigeria. (Nigeria)
OUYANG, Yong, Low Permeability Oil, Gas Field Exploration and Development National Engineering Laboratory, Sian, Shanxi, China. Petro China Changqing Oilfield Oil and Gas Research Institute, Sian, Shanxi, China. (China)
PAN, Mingxi, Geoscience College of Northeast Petroleum University, Daqing, China
PAN, Yongqiang, Petroleum Engineering Technology Research Institute of Shengli Oilfield Company, China.

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