Method to Predict Proppant flowback in Fractured Gas well

摘要

It has influences on the production of gas well and the effects of fracture when proppant flowback in the fractured gas well and the loss of the proppant from the fracture will corrupt the equipment above and below ground. For the problem of proppant flowback in fractured gas well, the purpose of this paper is to building a model of predict the proppant flowback in fractured gas well.With this model, the necessary control measures can provided to the designers during fracturing design stage, and Provide the basis for the rational allocation of production after the fracture. The prediction model includes both critical rate model of fracture and fracture shunt model. The critical gas rate at which depends on the moment balance of the proppant cracks can find out the critical velocity of gas. Then, Correct the critical velocity based on the formation closure stress, proppant size and strength, natural gas properties and gas seepage law. Last, the critical gas rate of fracture is computed using the gas velocity at borehole wall. Shunt a model of gas distribution between fracture and matrix depends on the numerical simulation. Demonstrate the usefulness of the model because the prediction results of the model agree with production data.