A new model for predicting critical fluid-carrying flow rate in horizontal wells with high gas-liquid ratio
It is essential to understand the mechanism of fluid accumulation in gas wells and the fluid-carrying law to determine the state of fluid flow in the well.There are a number of critical fluid-carrying flow rate models applied in the field,but the calculation results vary considerably from model to model.The gas well fluid-carrying flow rates calculated using the Turner's model and some other models for Changbei Block are larger than the actual values,which is not conducive to guiding production.Typical flow pattern are captured by conducting flow simulation orthogonal experiments in horizontal wells.Transitional flow is found to occur between the pipe slope angle of 45° and 60°.The flow pattern identification program further confirms that the transitional flow begins to occur at the pipe slope angle of 46°,which is the most difficult condition for carrying fluid.A new critical fluid-carrying flow rate model is established based on droplet theory,with the introduction of a well slope angle correction factor.The new model has good applicability in gas wells of Changbei Block.The results of sensitivity analysis of the new model show that the factors affecting the fluid-carrying capacity of gas wells are,in order from strong to weak,pipe diameter,bottomhole flowing pressure,well slope angle and bottomhole temperature.A critical fluid-carrying flow rate chart is produced to provide a basis for the timing of carrying out shut-in well management measures.
万方数据
维普
