MAXIMUM PENETRATION DEPTH AND PENETRATION TIME PREDICTING MODEL OF CEMENTING FLUID FLOW THROUGH WELLBORE INTO WEAKLY CONSOLIDATED FORMATION

A model for predicting the penetration depth and penetration time of cementing fluid through the wellbore into weakly consolidated formations based on the analytical fractal permeability model for power-law fluids considering the particle size of fluid and irreducible water is proposed and verified in this paper. The penetration distance and utilization dosage are related to the properties of cementing fluid and weakly consolidated formations. All of the parameters in the model have clear physical meaning, and no empirical parameter is used in this model. The results show that the cementing fluid tends to migrate to a long distance under a high pressure differential and low flow rate. The maximum penetration time and maximum penetration volume of cementing fluid increases with the increasing of grouting pressure and decreases with the increase in the volume flow rate. Therefore, throughout the cementing operation, the parameters should he adjusted based on the real situation.