Analysis on the Pressure Loss Law of Water Nozzles inLayered Water Injection Wells

The correct selection of water nozzle diameter plays a crucial role in the accuracy of layered flow regulation during water injection construction operations. However, the selection of the diameter of the fishing type water injection nozzle mainly relies on manual experience, which leads to low construction efficiency and a long deployment cycles. Set up an experimental device to collect flow rate and pressure difference data at both ends of the water nozzle, and obtain a pressure difference and flow rate relationship chart from small diameter to large diameter water nozzle diameter range through linear fitting of experimental data. Based on the energy equation of fluid mechanics water nozzle throttling, establish a formula for the relationship between local resistance coefficient and water nozzle area for different diameter water nozzle throttling. According to this formula, the water nozzle diameter under given flow rate and pressure difference conditions can be accurately calculated. Compare the on-site experimental data with the formula validation data and the literature experimental data with the formula validation data, and the error is no more than 5%. Establish three-dimensional models of water nozzles with different diameters, use FLUENT software for numerical simulation to calculate the pressure difference data of water nozzles with different diameters at diferent flow rates. Compare the flow pressure difference data obtained from numerical simulation with experimental data, the simulation results is no more than 12% between the experimental and simulation results. The numerical simulation error is within the range of the engineering accuracy requirements, and further verifing the reliability of the formula for the relationship between the local resistance coefficient of the water nozzle and the water nozzle area. The use of nozzle diagrams and relationship formulas is beneficial for accurate selection of nozzles in practical field applications, and has important value in improving the efficiency and accuracy of layered water injection flow regulation in oil fields.