Daniudi Gas Field has the reservoir characteristics of low permeability, dense and low pressure. In the process of fracturing operation, there is usually a difficulty in flow back and a low ratio of the flowing well. The layers that have a higher ratio of liquid nitrogen have a higher ratio of the flowing well. However, the production cost will be raised if the ratio of liquid nitrogen is raised unlimitedly. On the basis of the calculation of minimum liquid nitrogen, the starting pressure gradient is considered and the evaluation model of the minimum liquid nitrogen ratio of the flowing well is built. The minimum liquid nitrogen ratio of Box 1 gas layer of Daniudi Gas Field is calculated, which can provide a reference for the fracturing treatment of this gas field.
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