The Structure And Properties Of Several High Performance Fibers In High Temperature And High Pressure H 2 S/CO 2 Environment

Fiber-Reinforced Polymer Composites (FRPCs) has been extensively applied in oil and gas industry, because of its high strength, light weight and better chemical resistance than traditional metal materials. FRPCs is composed of high-performance fiber (HPF) and resin matrix, in which fiber as a reinforcing material palys a key role in the strength of the composites. To better evaluate the reliability of HPF for oil and gas applications, we studied the corrosion behavior and mechanism of four kinds of HPF including aramid fiber, Poly(p-phenylenebenzobisoxazole) fiber(PBO), carbon fiber and E-glass fiber when exposed to high temperature and high pressure (HTHP) H2S and CO2 corrosion environments directly. SEM, IR, TGA, XRD, Elemental Analysis, Density Measurements and Single Fiber Tensile Test were utilized to study the change of structure and properties of four kinds of HPF before and after corrosion. Four kinds of fiber have different degree of weight loss after corrosion, and E-glass fiber and aramid fiber both have the remarkable weight loss, PBO fiber has slight weight loss, cabon fiber has the lowest weight loss. After corrosion, All fibers exhibit lower density because of higher internal porosity caused by corrosion. SEM photo show more surface defects after corrosion, and aramid fiber and E-glass fiber seem to have more obvious change. The results of XRD illustrate that three kinds of fiber with crystal structure including aramid fiber, PBO fiber and carbon fiber show lower degree of crystallinity after corrosion.The tensile strength retention of aramid fiber, PBO fiber and carbon fiber are around 85% after HTHP water corrosion, and the strength retention of E-glass fiber is 72.73% after corrosion. The tensile strength retention of PBO fiber and carbon fiber are above 70% after HTHP H2S and CO2 corrosion, and the strength retention of aramid fiber and E-glass fiber is under 50% after corrosion. The results of Weibull statistical distribution show that the tensile properties parameters variation of HPFs are increased.The corrosion in can be categorized as physical corrosion and chemical corrosion, which affect the structure and overall performance of fiber synergistically.