November 7, 2000
Topic: Material Selection for Deep Water Wellhead Applications
With the discovery of oil and gas in deep waters the material selection process becomes difficult and complicated as compared to similar equipment on the surface. The costs associated with a material failure in deep waters are expensive and have many environmental implications. Historically, materials were needed to handle corrosive service consisting only of H2S, CO2 and Chlorides. With deeper wells being drilled, chemicals are required to minimize paraffin, asphaltene, hydrates, scale, biocides and corrosion. Many of these chemicals however have adverse effects on metallic and non-metallic materials. The problem is compounded when materials have to be selected to handle produced fluids, chemicals, and the effects of hydrogen embrittlement from the cathodic protection system. This discussion will cover approaches taken for selecting materials for these critical applications.