Erosive wear behavior of casing steel during hydraulic fracturing operation in shale gas well

During the hydraulic fracturing process, high speed fluid which contained solid particles would result in erosion between the fluid and the inner surface of the tubing or casing would cause great threat to the service safety of the downhole-tubular string. In this paper, the erosion experiment of the Q125HC casing steel were carried out in different carrying fluid velocity, erosion angle and sand content. The results showed that within the erosion angle of 0-90°, the erosion rate first increased, continuously come up to a "peak value", and then let up while the impact angle is increased, and also carrying fluid velocity has big impact on the erosion rate of the Q125HC casing steel.