Erosion wear of movable elbow is an important problem that cannot be ignored in fracturing field. In view of the phenomenon that particles carried in fracturing fluid are prone to erosion and wear of movable elbow pipes, a flow channel model was established. Orthogonal tests were designed according to the fluid parameters and pipeline structural parameters of movable elbow, and the influence of the erosion rate was analyzed by CFD numerical simulation. The test results show that the influence degree of each working parameter on the erosion rate of movable elbow is particle mass flow rate > particle diameter >2# bend Angle > flow rate. According to the orthogonal test results can guide the actual work, when the movable elbow is placed in U-shape, the erosion wear is the largest, and the position is in the bending surface of the elbow, so the movable elbow should be avoided in the U-shape state to reduce the erosion. At the same time, the erosion resistance design of the bend of the movable elbow is carried out, and the triangle erosion resistance groove is added. The maximum erosion wear rate of the original structure and the improved structure is compared with that of the original structure. The erosion wear of the improved structure is reduced by 39.01%, which proves that the improvement can effectively reduce the erosion wear of the movable elbow during work, and provides a solution for the erosion resistance of the movable elbow.

bend pipe union  /  erosive wear  /  orthogonal test  /  structure improvement