Abstract: The winding angle of filament-wound composite oil casing pipes acts as an important technical index for controlling the mechanical properties of the oil pipes. The winding angle used in production can be calculated according to the netting theory. Without considering the effect of resin, the winding angle of theoretical calculation is not optimal;the fiber can not fully play its role in test and actual application. We use the finite element method to establish a numerical model with which we calculate and analyze the influence of different winding angles on the mechanical properties of petroleum casing, and predict the minimum burst pressure. Through comparing the effect of different winding angle on the mechanical properties of the winding composite pipe, we concluded that the optimum winding angle is 51°, and the minimum burst pressure of casing pipe 9-5/8 is significantly improved by 20.3% as compared to the burst pressure of winding composite pipe of which winding angle according to the theory of grid. The mechanical properties of the oil casing pipe are improved and there is a certain practical significance in engineering application of composite materials.

Key words: winding angle, finite element method, mechanical properties, burst pressure