us to achieve this work successfully. Also we would like to thank the consortium of Sudan Univers... more us to achieve this work successfully. Also we would like to thank the consortium of Sudan University for Science and Technology, and specially family of petroleum engineering and technology, without excluding anyone from teachers, assistant teachers, colleagues, to personnel of university's libraries. A special gratitude to our supervisor, Mr. Mohamed Salah, which has guided us with his wise lead and continuous efforts from the inception of this research until it reached its final form. Also we would like to thank Mr. Osman Malik for his cooperation with us which meant a lot to us.
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