Abstract
For serioius erosion of the sudden expansion and contraction (SEC) in fracturing tubing, numerical simulation of SEC flow field is carried out using CFD and reynolds tress model. The velocity flow field and sand concentration in calculation region is achieved. The flowfields indicate that a large recirculation zone exists and sand concentration increases in the SEC, which causes the mixture of fluid and sand to impact upon the wall at the certain angle, and aroused erosion. Based on the obtained erosion reason, the structure optimization of the SEC are proceeded. Which improved the flow in SEC, reduced the erosion of SEC, and extended the service life of the tool.
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