الفهرس 
I. INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Abstract:
Corrosion by drilling fluids is one of the major issues in drilling engineering problems as it causes huge economic losses. Electrochemical dissolution of the metal / water or saltwater interface occurs where freshwater or salt water is connected to the metal. This is the most common type of corrosion in drilling equipments. During electrolysis, the metal ions dissolve in the water / saline solution and the solution becomes electrically conductive. Formation Water is commonly used as a base in oil drilling fluids, so it is highly recommended to use corrosion inhibitors. Corrosion problems occur in the first place where the drilling fluids come into contact with some corrosive gases such as oxygen, carbon dioxide, hydrogen sulphide or salts such as sodium chloride, potassium chloride and others that presents at different concentrations. Hence, this thesis reflects one of the practical steps towards solving this problem. The thesis is divided into three main parts: The First Part is The Introduction: The introduction includes the definition of drilling fluids, their types, function during the drilling of oil wells, their properties and the problem of corrosion during the drilling process and the use of phosphonates as inhibitors of corrosion.